Add saml2-login java-configuration sample

Issue gh-10

README.adoc

@@ -42,7 +42,7 @@ Samples for https://github.com/spring-projects/spring-security
 
 === SAML 2.0
 
-* https://github.com/spring-projects/spring-security-samples/tree/main/servlet/spring-boot/java/saml2/login[Login & Logout]
+* Login & Logout - https://github.com/spring-projects/spring-security-samples/tree/main/servlet/spring-boot/java/saml2/login[Spring Boot] | https://github.com/spring-projects/spring-security-samples/tree/main/servlet/java-configuration/saml2/login[Java Configuration]
 
 === Authentication
 

servlet/java-configuration/saml2/login/README.adoc

@@ -0,0 +1,50 @@
+= SAML 2.0 Login & Logout Sample
+
+This guide provides instructions on setting up this SAML 2.0 Login & Logout sample application.
+It uses https://simplesamlphp.org/[SimpleSAMLphp] as its asserting party.
+
+The sample application uses Spring Boot and the `spring-security-saml2-service-provider`
+module which is new in Spring Security 5.2.
+
+The https://docs.spring.io/spring-security/site/docs/5.6.0-SNAPSHOT/reference/html5/#servlet-saml2login-logout[SAML 2.0 Logout feature] is new in Spring Security 5.6.
+
+== Goals
+
+=== SAML 2.0 Login
+
+`saml2Login()` provides a very simple implementation of a Service Provider that can receive a SAML 2.0 Response via the HTTP-POST and HTTP-REDIRECT bindings against the SimpleSAMLphp SAML 2.0 reference implementation.
+
+The following features are implemented in the MVP:
+
+1. Receive and validate a SAML 2.0 Response containing an assertion, and create a corresponding authentication in Spring Security
+2. Send a SAML 2.0 AuthNRequest to an Identity Provider
+3. Provide a framework for components used in SAML 2.0 authentication that can be swapped by configuration
+4. Work against the SimpleSAMLphp reference implementation
+
+=== SAML 2.0 Single Logout
+
+`saml2Logout()` supports RP- and AP-initiated SAML 2.0 Single Logout via the HTTP-POST and HTTP-REDIRECT bindings against the SimpleSAMLphp SAML 2.0 reference implementation.
+
+On this sample, the SAML 2.0 Logout is using the HTTP-POST binding.
+
+You can refer to the https://docs.spring.io/spring-security/site/docs/5.6.0-SNAPSHOT/reference/html5/#servlet-saml2login-logout[reference documentation] for more details about the RP- and AP-initiated SAML 2.0 Logout.
+
+== Run the Sample
+
+=== Start up the application
+
+You should run the application war in a servlet container like Tomcat
+
+=== Open a Browser
+
+http://localhost:8080/
+
+You will be redirect to the SimpleSAMLphp IDP
+
+=== Type in your credentials
+
+```
+User: user
+Password: password
+```
+

servlet/java-configuration/saml2/login/build.gradle

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2021 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+plugins {
+	id "java"
+	id "nebula.integtest" version "8.2.0"
+	id "org.gretty" version "3.0.6"
+	id "war"
+}
+
+apply from: "gradle/gretty.gradle"
+
+repositories {
+	jcenter()
+	maven { url "https://repo.spring.io/snapshot" }
+	maven { url "https://build.shibboleth.net/nexus/content/repositories/releases/" }
+}
+
+dependencies {
+	constraints {
+		implementation "org.opensaml:opensaml-core:4.1.1"
+		implementation "org.opensaml:opensaml-saml-api:4.1.1"
+		implementation "org.opensaml:opensaml-saml-impl:4.1.1"
+	}
+	implementation platform("org.springframework:spring-framework-bom:5.3.11")
+	implementation platform("org.springframework.security:spring-security-bom:5.6.0-SNAPSHOT")
+	implementation platform("org.junit:junit-bom:5.7.0")
+
+	implementation "org.springframework.security:spring-security-config"
+	implementation "org.springframework.security:spring-security-web"
+	implementation "org.springframework:spring-webmvc"
+	implementation "org.springframework.security:spring-security-saml2-service-provider"
+	implementation "javax.servlet.jsp.jstl:javax.servlet.jsp.jstl-api:1.2.2"
+	implementation "org.apache.taglibs:taglibs-standard-jstlel:1.2.5"
+	implementation "org.thymeleaf:thymeleaf-spring5:3.0.11.RELEASE"
+	implementation "org.thymeleaf.extras:thymeleaf-extras-springsecurity5:3.0.4.RELEASE"
+
+	providedCompile "javax.servlet:javax.servlet-api:4.0.1"
+	providedCompile "javax.servlet.jsp:javax.servlet.jsp-api:2.3.3"
+
+	testImplementation "org.assertj:assertj-core:3.18.0"
+	testImplementation "org.springframework:spring-test"
+	testImplementation "org.springframework.security:spring-security-test"
+	testImplementation("org.junit.jupiter:junit-jupiter-api")
+
+	testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine")
+
+	integTestImplementation "org.seleniumhq.selenium:htmlunit-driver:2.44.0"
+}
+
+tasks.withType(Test).configureEach {
+	useJUnitPlatform()
+}

servlet/java-configuration/saml2/login/gradle/gretty.gradle

@@ -0,0 +1,41 @@
+gretty {
+	servletContainer = "tomcat9"
+	contextPath = "/"
+	fileLogEnabled = false
+	integrationTestTask = 'integrationTest'
+}
+
+Task prepareAppServerForIntegrationTests = project.tasks.create('prepareAppServerForIntegrationTests') {
+	group = 'Verification'
+	description = 'Prepares the app server for integration tests'
+	doFirst {
+		project.gretty {
+			httpPort = -1
+		}
+	}
+}
+
+project.tasks.matching { it.name == "appBeforeIntegrationTest" }.all { task ->
+	task.dependsOn prepareAppServerForIntegrationTests
+}
+
+project.tasks.matching { it.name == "integrationTest" }.all {
+	task -> task.doFirst {
+		def gretty = project.gretty
+		String host = project.gretty.host ?: 'localhost'
+		boolean isHttps = gretty.httpsEnabled
+		Integer httpPort = integrationTest.systemProperties['gretty.httpPort']
+		Integer httpsPort = integrationTest.systemProperties['gretty.httpsPort']
+		int port = isHttps ? httpsPort : httpPort
+		String contextPath = project.gretty.contextPath
+		String httpBaseUrl = "http://${host}:${httpPort}${contextPath}"
+		String httpsBaseUrl = "https://${host}:${httpsPort}${contextPath}"
+		String baseUrl = isHttps ? httpsBaseUrl : httpBaseUrl
+		integrationTest.systemProperty 'app.port', port
+		integrationTest.systemProperty 'app.httpPort', httpPort
+		integrationTest.systemProperty 'app.httpsPort', httpsPort
+		integrationTest.systemProperty 'app.baseURI', baseUrl
+		integrationTest.systemProperty 'app.httpBaseURI', httpBaseUrl
+		integrationTest.systemProperty 'app.httpsBaseURI', httpsBaseUrl
+	}
+}

servlet/java-configuration/saml2/login/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

servlet/java-configuration/saml2/login/gradlew

@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"

servlet/java-configuration/saml2/login/gradlew.bat

@@ -0,0 +1,104 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

servlet/java-configuration/saml2/login/settings.gradle

@@ -0,0 +1 @@
+

servlet/java-configuration/saml2/login/src/main/java/example/ApplicationConfiguration.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package example;
+
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@ComponentScan
+public class ApplicationConfiguration {
+
+}

servlet/java-configuration/saml2/login/src/main/java/example/IndexController.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2002-2021 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package example;
+
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.security.saml2.provider.service.authentication.Saml2AuthenticatedPrincipal;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+
+/**
+ * Controller for "/".
+ *
+ * @author Rob WInch
+ */
+@Controller
+public class IndexController {
+
+	@GetMapping("/")
+	public String index(Model model, @AuthenticationPrincipal Saml2AuthenticatedPrincipal principal) {
+		String emailAddress = principal.getFirstAttribute("emailAddress");
+		model.addAttribute("emailAddress", emailAddress);
+		model.addAttribute("userAttributes", principal.getAttributes());
+		return "index";
+	}
+
+}

servlet/java-configuration/saml2/login/src/main/java/example/MvcWebApplicationInitializer.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package example;
+
+import javax.servlet.Filter;
+
+import org.springframework.web.filter.HiddenHttpMethodFilter;
+import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
+
+public class MvcWebApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
+
+	@Override
+	protected Class<?>[] getRootConfigClasses() {
+		return null;
+	}
+
+	@Override
+	protected Class<?>[] getServletConfigClasses() {
+		return new Class[] { ApplicationConfiguration.class };
+	}
+
+	@Override
+	protected String[] getServletMappings() {
+		return new String[] { "/" };
+	}
+
+	@Override
+	protected Filter[] getServletFilters() {
+		return new Filter[] { new HiddenHttpMethodFilter() };
+	}
+
+}

servlet/java-configuration/saml2/login/src/main/java/example/SecurityConfiguration.java

@@ -0,0 +1,89 @@
+/*
+ * Copyright 2002-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package example;
+
+import java.io.InputStream;
+import java.security.cert.CertificateFactory;
+import java.security.cert.X509Certificate;
+import java.security.interfaces.RSAPrivateKey;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.Resource;
+import org.springframework.security.config.Customizer;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.saml2.core.Saml2X509Credential;
+import org.springframework.security.saml2.provider.service.registration.InMemoryRelyingPartyRegistrationRepository;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrations;
+import org.springframework.security.saml2.provider.service.web.DefaultRelyingPartyRegistrationResolver;
+import org.springframework.security.saml2.provider.service.web.RelyingPartyRegistrationResolver;
+import org.springframework.security.web.SecurityFilterChain;
+
+@EnableWebSecurity
+public class SecurityConfiguration {
+
+	@Value("classpath:credentials/rp-private.key")
+	RSAPrivateKey privateKey;
+
+	@Bean
+	SecurityFilterChain app(HttpSecurity http) throws Exception {
+		// @formatter:off
+		http
+				.authorizeRequests((authorize) -> authorize
+						.anyRequest().authenticated()
+				)
+				.saml2Login(Customizer.withDefaults())
+				.saml2Logout(Customizer.withDefaults());
+		// @formatter:on
+
+		return http.build();
+	}
+
+	@Bean
+	RelyingPartyRegistrationResolver relyingPartyRegistrationResolver(
+			RelyingPartyRegistrationRepository registrations) {
+		return new DefaultRelyingPartyRegistrationResolver(registrations);
+	}
+
+	@Bean
+	RelyingPartyRegistrationRepository relyingPartyRegistrationRepository() {
+		RelyingPartyRegistration relyingPartyRegistration = RelyingPartyRegistrations
+				.fromMetadataLocation("https://simplesaml-for-spring-saml.apps.pcfone.io/saml2/idp/metadata.php")
+				.registrationId("one")
+				.decryptionX509Credentials(
+						(c) -> c.add(Saml2X509Credential.decryption(this.privateKey, relyingPartyCertificate())))
+				.signingX509Credentials(
+						(c) -> c.add(Saml2X509Credential.signing(this.privateKey, relyingPartyCertificate())))
+				.build();
+
+		return new InMemoryRelyingPartyRegistrationRepository(relyingPartyRegistration);
+	}
+
+	X509Certificate relyingPartyCertificate() {
+		Resource resource = new ClassPathResource("credentials/rp-certificate.crt");
+		try (InputStream is = resource.getInputStream()) {
+			return (X509Certificate) CertificateFactory.getInstance("X.509").generateCertificate(is);
+		}
+		catch (Exception ex) {
+			throw new UnsupportedOperationException(ex);
+		}
+	}
+
+}

servlet/java-configuration/saml2/login/src/main/java/example/SecurityWebApplicationInitializer.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package example;
+
+import org.springframework.security.web.context.AbstractSecurityWebApplicationInitializer;
+import org.springframework.security.web.session.HttpSessionEventPublisher;
+
+/**
+ * We customize {@link AbstractSecurityWebApplicationInitializer} to enable the
+ * {@link HttpSessionEventPublisher}.
+ *
+ * @author Rob Winch
+ */
+public class SecurityWebApplicationInitializer extends AbstractSecurityWebApplicationInitializer {
+
+	@Override
+	protected boolean enableHttpSessionEventPublisher() {
+		return true;
+	}
+
+}

servlet/java-configuration/saml2/login/src/main/java/example/WebMvcConfiguration.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2021 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package example;
+
+import org.thymeleaf.extras.springsecurity5.dialect.SpringSecurityDialect;
+import org.thymeleaf.spring5.ISpringTemplateEngine;
+import org.thymeleaf.spring5.SpringTemplateEngine;
+import org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver;
+import org.thymeleaf.spring5.view.ThymeleafViewResolver;
+import org.thymeleaf.templatemode.TemplateMode;
+import org.thymeleaf.templateresolver.ITemplateResolver;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.Ordered;
+import org.springframework.web.servlet.ViewResolver;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
+import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+@EnableWebMvc
+@Configuration
+public class WebMvcConfiguration implements WebMvcConfigurer {
+
+	@Override
+	public void addViewControllers(ViewControllerRegistry registry) {
+		registry.setOrder(Ordered.HIGHEST_PRECEDENCE);
+	}
+
+	@Override
+	public void addResourceHandlers(ResourceHandlerRegistry registry) {
+		// @formatter:off
+		registry.addResourceHandler("/resources/**")
+				.addResourceLocations("classpath:/resources/")
+				.setCachePeriod(0);
+		// @formatter:on
+		registry.setOrder(Ordered.HIGHEST_PRECEDENCE);
+	}
+
+	@Bean
+	public ViewResolver viewResolver(ISpringTemplateEngine templateEngine) {
+		ThymeleafViewResolver resolver = new ThymeleafViewResolver();
+		resolver.setTemplateEngine(templateEngine);
+		resolver.setCharacterEncoding("UTF-8");
+		return resolver;
+	}
+
+	@Bean
+	public SpringTemplateEngine templateEngine(ITemplateResolver templateResolver) {
+		SpringTemplateEngine engine = new SpringTemplateEngine();
+		engine.setEnableSpringELCompiler(true);
+		engine.setTemplateResolver(templateResolver);
+		engine.addDialect(new SpringSecurityDialect());
+		return engine;
+	}
+
+	@Bean
+	public SpringResourceTemplateResolver templateResolver() {
+		SpringResourceTemplateResolver resolver = new SpringResourceTemplateResolver();
+		resolver.setPrefix("classpath:/templates/");
+		resolver.setSuffix(".html");
+		resolver.setTemplateMode(TemplateMode.HTML);
+		return resolver;
+	}
+
+}

servlet/java-configuration/saml2/login/src/main/resources/credentials/idp-certificate.crt

@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

servlet/java-configuration/saml2/login/src/main/resources/credentials/rp-certificate.crt

@@ -0,0 +1,16 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

servlet/java-configuration/saml2/login/src/main/resources/credentials/rp-private.key

@@ -0,0 +1,16 @@
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----

servlet/java-configuration/saml2/login/src/main/resources/logback.xml

@@ -0,0 +1,12 @@
+<configuration>
+	<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+	<encoder>
+		<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+	</encoder>
+	</appender>
+
+	<root level="TRACE">
+		<appender-ref ref="STDOUT" />
+	</root>
+
+</configuration>

servlet/java-configuration/saml2/login/src/main/resources/templates/index.html

@@ -0,0 +1,60 @@
+<!--
+  ~ Copyright 2002-2021 the original author or authors.
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      https://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<!doctype html>
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="https://www.thymeleaf.org" xmlns:sec="https://www.thymeleaf.org/thymeleaf-extras-springsecurity5">
+<head>
+    <title>Spring Security - SAML 2.0 Login & Logout</title>
+    <meta charset="utf-8" />
+    <style>
+        span, dt {
+            font-weight: bold;
+        }
+    </style>
+    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
+</head>
+<body>
+<div class="container">
+    <ul class="nav">
+        <li class="nav-item">
+            <form th:action="@{/logout}" method="post">
+                <button class="btn btn-primary" id="rp_logout_button" type="submit">
+                    RP-initiated Logout
+                </button>
+            </form>
+        </li>
+        <li class="nav-item">
+            <a id="ap_logout_button" class="nav-link" href="https://simplesaml-for-spring-saml.apps.pcfone.io/saml2/idp/SingleLogoutService.php?ReturnTo=http://localhost:8080/login?logout">
+                AP-initiated Logout
+            </a>
+        </li>
+    </ul>
+    </div>
+    <main role="main" class="container">
+        <h1 class="mt-5">SAML 2.0 Login & Single Logout with Spring Security</h1>
+        <p class="lead">You are successfully logged in as <span sec:authentication="name"></span></p>
+        <p class="lead">You're email address is <span th:text="${emailAddress}"></span></p>
+        <h2 class="mt-2">All Your Attributes</h2>
+        <dl th:each="userAttribute : ${userAttributes}">
+            <dt th:text="${userAttribute.key}"></dt>
+            <dd th:text="${userAttribute.value}"></dd>
+        </dl>
+
+        <h6>Visit the <a href="https://docs.spring.io/spring-security/site/docs/current/reference/html5/#servlet-saml2" target="_blank">SAML 2.0 Login & Logout</a> documentation for more details.</h6>
+    </main>
+</div>
+</body>
+</html>

settings.gradle

@@ -39,6 +39,7 @@ include ":servlet:java-configuration:hello-mvc-security"
 include ":servlet:java-configuration:hello-security"
 include ":servlet:java-configuration:hello-security-explicit"
 include ":servlet:java-configuration:max-sessions"
+include ":servlet:java-configuration:saml2:login"
 include ":servlet:spring-boot:java:authentication:username-password:user-details-service:custom-user"
 include ":servlet:spring-boot:java:authentication:username-password:mfa"
 include ":servlet:spring-boot:java:hello"