MFA Sample

Closes gh-7

servlet/spring-boot/java/authentication/username-password/mfa/build.gradle

@@ -0,0 +1,26 @@
+plugins {
+	id 'io.spring.dependency-management' version '1.0.10.RELEASE'
+	id 'org.springframework.boot' version '2.4.0'
+	id "nebula.integtest" version "7.0.9"
+	id 'java'
+}
+
+repositories {
+	jcenter()
+	maven { url "https://repo.spring.io/snapshot" }
+}
+
+dependencies {
+	implementation 'org.springframework.boot:spring-boot-starter-security'
+	implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
+	implementation 'org.springframework.boot:spring-boot-starter-web'
+
+	implementation 'com.j256.two-factor-auth:two-factor-auth:1.3'
+
+	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+	testImplementation 'org.springframework.security:spring-security-test'
+}
+
+tasks.withType(Test).configureEach {
+	useJUnitPlatform()
+}

servlet/spring-boot/java/authentication/username-password/mfa/gradle.properties

@@ -0,0 +1,2 @@
+version=5.5.0-SNAPSHOT
+spring-security.version=5.5.0-SNAPSHOT

servlet/spring-boot/java/authentication/username-password/mfa/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

servlet/spring-boot/java/authentication/username-password/mfa/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/spring-boot/java/authentication/username-password/mfa/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/spring-boot/java/authentication/username-password/mfa/settings.gradle

@@ -0,0 +1 @@
+

servlet/spring-boot/java/authentication/username-password/mfa/src/main/java/example/CustomUser.java

@@ -0,0 +1,75 @@
+/*
+ * 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 com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
+/**
+ * A custom user representation.
+ *
+ * @author Rob Winch
+ */
+public class CustomUser {
+
+	private final long id;
+
+	private final String email;
+
+	@JsonIgnore
+	private final String password;
+
+	@JsonIgnore
+	private final String secret;
+
+	@JsonIgnore
+	private final String answer;
+
+	@JsonCreator
+	public CustomUser(long id, String email, String password, String secret, String answer) {
+		this.id = id;
+		this.email = email;
+		this.password = password;
+		this.secret = secret;
+		this.answer = answer;
+	}
+
+	public CustomUser(CustomUser user) {
+		this(user.id, user.email, user.password, user.secret, user.answer);
+	}
+
+	public long getId() {
+		return this.id;
+	}
+
+	public String getEmail() {
+		return this.email;
+	}
+
+	public String getPassword() {
+		return this.password;
+	}
+
+	public String getSecret() {
+		return this.secret;
+	}
+
+	public String getAnswer() {
+		return this.answer;
+	}
+
+}

servlet/spring-boot/java/authentication/username-password/mfa/src/main/java/example/CustomUserRepository.java

@@ -0,0 +1,23 @@
+/*
+ * 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;
+
+public interface CustomUserRepository {
+
+	CustomUser findCustomUserByEmail(String email);
+
+}

servlet/spring-boot/java/authentication/username-password/mfa/src/main/java/example/CustomUserRepositoryUserDetailsService.java

@@ -0,0 +1,89 @@
+/*
+ * 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 java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+import org.springframework.security.core.GrantedAuthority;
+import org.springframework.security.core.authority.AuthorityUtils;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
+import org.springframework.stereotype.Service;
+
+@Service
+public class CustomUserRepositoryUserDetailsService implements UserDetailsService {
+
+	private final CustomUserRepository userRepository;
+
+	public CustomUserRepositoryUserDetailsService(CustomUserRepository userRepository) {
+		this.userRepository = userRepository;
+	}
+
+	@Override
+	public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
+		CustomUser customUser = this.userRepository.findCustomUserByEmail(username);
+		if (customUser == null) {
+			throw new UsernameNotFoundException("username " + username + " is not found");
+		}
+		return new CustomUserDetails(customUser);
+	}
+
+	static final class CustomUserDetails extends CustomUser implements UserDetails {
+
+		private static final List<GrantedAuthority> ROLE_USER = Collections
+				.unmodifiableList(AuthorityUtils.createAuthorityList("ROLE_USER"));
+
+		CustomUserDetails(CustomUser customUser) {
+			super(customUser);
+		}
+
+		@Override
+		public Collection<? extends GrantedAuthority> getAuthorities() {
+			return ROLE_USER;
+		}
+
+		@Override
+		public String getUsername() {
+			return getEmail();
+		}
+
+		@Override
+		public boolean isAccountNonExpired() {
+			return true;
+		}
+
+		@Override
+		public boolean isAccountNonLocked() {
+			return true;
+		}
+
+		@Override
+		public boolean isCredentialsNonExpired() {
+			return true;
+		}
+
+		@Override
+		public boolean isEnabled() {
+			return true;
+		}
+
+	}
+
+}

servlet/spring-boot/java/authentication/username-password/mfa/src/main/java/example/MapCustomUserRepository.java

@@ -0,0 +1,34 @@
+/*
+ * 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 java.util.Map;
+
+public class MapCustomUserRepository implements CustomUserRepository {
+
+	private final Map<String, CustomUser> emailToCustomUser;
+
+	public MapCustomUserRepository(Map<String, CustomUser> emailToCustomUser) {
+		this.emailToCustomUser = emailToCustomUser;
+	}
+
+	@Override
+	public CustomUser findCustomUserByEmail(String email) {
+		return this.emailToCustomUser.get(email);
+	}
+
+}

servlet/spring-boot/java/authentication/username-password/mfa/src/main/java/example/MfaApplication.java

@@ -0,0 +1,71 @@
+/*
+ * 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 java.util.HashMap;
+import java.util.Map;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.security.crypto.codec.Hex;
+import org.springframework.security.crypto.encrypt.BytesEncryptor;
+
+/**
+ * Hello Security application.
+ *
+ * @author Josh Cummings
+ */
+@SpringBootApplication
+public class MfaApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(MfaApplication.class, args);
+	}
+
+	@Bean
+	MapCustomUserRepository userRepository(BytesEncryptor encryptor) {
+		// the hashed password was calculated using the following code
+		// the hash should be done up front, so malicious users cannot discover the
+		// password
+		// PasswordEncoder encoder =
+		// PasswordEncoderFactories.createDelegatingPasswordEncoder();
+		// String encodedPassword = encoder.encode("password");
+
+		// the raw password is "password"
+		String encodedPassword = "{bcrypt}$2a$10$h/AJueu7Xt9yh3qYuAXtk.WZJ544Uc2kdOKlHu2qQzCh/A3rq46qm";
+
+		// to sync your phone with the Google Authenticator secret, hand enter the value
+		// in base32Key
+		// String base32Key = "QDWSM3OYBPGTEVSPB5FKVDM3CSNCWHVK";
+		// Base32 base32 = new Base32();
+		// byte[] b = base32.decode(base32Key);
+		// String secret = Hex.encodeHexString(b);
+
+		String hexSecret = "80ed266dd80bcd32564f0f4aaa8d9b149a2b1eaa";
+		String encrypted = new String(Hex.encode(encryptor.encrypt(hexSecret.getBytes())));
+
+		// the raw security answer is "smith"
+		String encodedSecurityAnswer = "{bcrypt}$2a$10$JIXMjAszy3RUu8y5T0zH0enGJCGumI8YE.K7w3wsM5xXDfeVIsJhq";
+
+		CustomUser customUser = new CustomUser(1L, "user@example.com", encodedPassword, encrypted,
+				encodedSecurityAnswer);
+		Map<String, CustomUser> emailToCustomUser = new HashMap<>();
+		emailToCustomUser.put(customUser.getEmail(), customUser);
+		return new MapCustomUserRepository(emailToCustomUser);
+	}
+
+}

servlet/spring-boot/java/authentication/username-password/mfa/src/main/java/example/MfaAuthentication.java

@@ -0,0 +1,60 @@
+/*
+ * 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 java.util.Collections;
+
+import org.springframework.security.authentication.AbstractAuthenticationToken;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.CredentialsContainer;
+
+public class MfaAuthentication extends AbstractAuthenticationToken {
+
+	private final Authentication first;
+
+	public MfaAuthentication(Authentication first) {
+		super(Collections.emptyList());
+		this.first = first;
+	}
+
+	@Override
+	public Object getPrincipal() {
+		return this.first.getPrincipal();
+	}
+
+	@Override
+	public Object getCredentials() {
+		return this.first.getCredentials();
+	}
+
+	@Override
+	public void eraseCredentials() {
+		if (this.first instanceof CredentialsContainer) {
+			((CredentialsContainer) this.first).eraseCredentials();
+		}
+	}
+
+	@Override
+	public boolean isAuthenticated() {
+		return false;
+	}
+
+	public Authentication getFirst() {
+		return this.first;
+	}
+
+}

servlet/spring-boot/java/authentication/username-password/mfa/src/main/java/example/MfaAuthenticationHandler.java

@@ -0,0 +1,72 @@
+/*
+ * 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 java.io.IOException;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.springframework.security.authentication.AnonymousAuthenticationToken;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.AuthenticationException;
+import org.springframework.security.core.authority.AuthorityUtils;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.security.web.authentication.AuthenticationFailureHandler;
+import org.springframework.security.web.authentication.AuthenticationSuccessHandler;
+import org.springframework.security.web.authentication.SimpleUrlAuthenticationSuccessHandler;
+
+/**
+ * An authentication handler that saves an authentication either way.
+ *
+ * The reason for this is so that the rest of the factors are collected, even if earlier
+ * factors failed.
+ *
+ * @author Josh Cummings
+ */
+public class MfaAuthenticationHandler implements AuthenticationSuccessHandler, AuthenticationFailureHandler {
+
+	private final AuthenticationSuccessHandler successHandler;
+
+	public MfaAuthenticationHandler(String url) {
+		SimpleUrlAuthenticationSuccessHandler successHandler = new SimpleUrlAuthenticationSuccessHandler(url);
+		successHandler.setAlwaysUseDefaultTargetUrl(true);
+		this.successHandler = successHandler;
+	}
+
+	@Override
+	public void onAuthenticationFailure(HttpServletRequest request, HttpServletResponse response,
+			AuthenticationException exception) throws IOException, ServletException {
+		Authentication anonymous = new AnonymousAuthenticationToken("key", "anonymousUser",
+				AuthorityUtils.createAuthorityList("ROLE_ANONYMOUS"));
+		saveMfaAuthentication(request, response, new MfaAuthentication(anonymous));
+	}
+
+	@Override
+	public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response,
+			Authentication authentication) throws IOException, ServletException {
+		saveMfaAuthentication(request, response, authentication);
+	}
+
+	private void saveMfaAuthentication(HttpServletRequest request, HttpServletResponse response,
+			Authentication authentication) throws IOException, ServletException {
+		SecurityContextHolder.getContext().setAuthentication(new MfaAuthentication(authentication));
+		this.successHandler.onAuthenticationSuccess(request, response, authentication);
+	}
+
+}

servlet/spring-boot/java/authentication/username-password/mfa/src/main/java/example/MfaController.java

@@ -0,0 +1,129 @@
+/*
+ * 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 java.security.SecureRandom;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.springframework.security.authentication.BadCredentialsException;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.security.crypto.codec.Hex;
+import org.springframework.security.crypto.encrypt.BytesEncryptor;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.security.web.authentication.AuthenticationFailureHandler;
+import org.springframework.security.web.authentication.AuthenticationSuccessHandler;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+
+@Controller
+public class MfaController {
+
+	private final MfaService mfaService;
+
+	private final BytesEncryptor encryptor;
+
+	private final PasswordEncoder encoder;
+
+	private final AuthenticationSuccessHandler successHandler;
+
+	private final AuthenticationFailureHandler failureHandler;
+
+	private final String failedAuthenticationSecret;
+
+	private final String failedAuthenticationSecurityAnswer;
+
+	public MfaController(MfaService mfaService, BytesEncryptor encryptor, PasswordEncoder encoder,
+			AuthenticationSuccessHandler successHandler, AuthenticationFailureHandler failureHandler) {
+
+		this.mfaService = mfaService;
+		this.encryptor = encryptor;
+		this.encoder = encoder;
+		this.successHandler = successHandler;
+		this.failureHandler = failureHandler;
+
+		this.failedAuthenticationSecret = randomValue();
+		this.failedAuthenticationSecurityAnswer = this.encoder.encode(randomValue());
+	}
+
+	@GetMapping("/second-factor")
+	public String requestSecondFactor() {
+		return "second-factor";
+	}
+
+	@PostMapping("/second-factor")
+	public void processSecondFactor(@RequestParam("code") String code, MfaAuthentication authentication,
+			HttpServletRequest request, HttpServletResponse response) throws Exception {
+		MfaAuthenticationHandler handler = new MfaAuthenticationHandler("/third-factor");
+		String secret = getSecret(authentication);
+		if (this.mfaService.check(secret, code)) {
+			handler.onAuthenticationSuccess(request, response, authentication.getFirst());
+		}
+		else {
+			handler.onAuthenticationFailure(request, response, new BadCredentialsException("bad credentials"));
+		}
+	}
+
+	@GetMapping("/third-factor")
+	public String requestThirdFactor() {
+		return "third-factor";
+	}
+
+	@PostMapping("/third-factor")
+	public void processThirdFactor(@RequestParam("answer") String answer, MfaAuthentication authentication,
+			HttpServletRequest request, HttpServletResponse response) throws Exception {
+		String encodedAnswer = getAnswer(authentication);
+		if (this.encoder.matches(answer, encodedAnswer)) {
+			SecurityContextHolder.getContext().setAuthentication(authentication.getFirst());
+			this.successHandler.onAuthenticationSuccess(request, response, authentication.getFirst());
+		}
+		else {
+			this.failureHandler.onAuthenticationFailure(request, response,
+					new BadCredentialsException("bad credentials"));
+		}
+	}
+
+	private String getSecret(MfaAuthentication authentication) throws Exception {
+		if (authentication.getPrincipal() instanceof CustomUser) {
+			CustomUser user = (CustomUser) authentication.getPrincipal();
+			byte[] bytes = Hex.decode(user.getSecret());
+			return new String(this.encryptor.decrypt(bytes));
+		}
+		// earlier factor failed
+		return this.failedAuthenticationSecret;
+	}
+
+	private String getAnswer(MfaAuthentication authentication) {
+		if (authentication.getPrincipal() instanceof CustomUser) {
+			CustomUser user = (CustomUser) authentication.getPrincipal();
+			return user.getAnswer();
+		}
+		// earlier factor failed
+		return this.failedAuthenticationSecurityAnswer;
+	}
+
+	private static String randomValue() {
+		SecureRandom random = new SecureRandom();
+		byte[] bytes = new byte[20];
+		random.nextBytes(bytes);
+		return new String(Hex.encode(bytes));
+	}
+
+}

servlet/spring-boot/java/authentication/username-password/mfa/src/main/java/example/MfaService.java

@@ -0,0 +1,37 @@
+/*
+ * 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 java.security.GeneralSecurityException;
+
+import com.j256.twofactorauth.TimeBasedOneTimePasswordUtil;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class MfaService {
+
+	public boolean check(String hexKey, String code) {
+		try {
+			return TimeBasedOneTimePasswordUtil.validateCurrentNumberHex(hexKey, Integer.parseInt(code), 10000);
+		}
+		catch (GeneralSecurityException ex) {
+			throw new IllegalArgumentException(ex);
+		}
+	}
+
+}

servlet/spring-boot/java/authentication/username-password/mfa/src/main/java/example/MfaTrustResolver.java

@@ -0,0 +1,37 @@
+/*
+ * 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.springframework.security.authentication.AuthenticationTrustResolver;
+import org.springframework.security.authentication.AuthenticationTrustResolverImpl;
+import org.springframework.security.core.Authentication;
+
+public class MfaTrustResolver implements AuthenticationTrustResolver {
+
+	private final AuthenticationTrustResolver delegate = new AuthenticationTrustResolverImpl();
+
+	@Override
+	public boolean isAnonymous(Authentication authentication) {
+		return this.delegate.isAnonymous(authentication) || authentication instanceof MfaAuthentication;
+	}
+
+	@Override
+	public boolean isRememberMe(Authentication authentication) {
+		return this.delegate.isRememberMe(authentication);
+	}
+
+}

servlet/spring-boot/java/authentication/username-password/mfa/src/main/java/example/SecurityConfig.java

@@ -0,0 +1,94 @@
+/*
+ * 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 javax.crypto.KeyGenerator;
+import javax.crypto.SecretKey;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.authorization.AuthorizationDecision;
+import org.springframework.security.authorization.AuthorizationManager;
+import org.springframework.security.config.annotation.ObjectPostProcessor;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.crypto.encrypt.AesBytesEncryptor;
+import org.springframework.security.crypto.factory.PasswordEncoderFactories;
+import org.springframework.security.crypto.keygen.KeyGenerators;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.security.web.access.ExceptionTranslationFilter;
+import org.springframework.security.web.access.intercept.RequestAuthorizationContext;
+import org.springframework.security.web.authentication.AuthenticationFailureHandler;
+import org.springframework.security.web.authentication.AuthenticationSuccessHandler;
+import org.springframework.security.web.authentication.SavedRequestAwareAuthenticationSuccessHandler;
+import org.springframework.security.web.authentication.SimpleUrlAuthenticationFailureHandler;
+
+@Configuration
+public class SecurityConfig {
+
+	@Bean
+	SecurityFilterChain web(HttpSecurity http,
+			AuthorizationManager<RequestAuthorizationContext> mfaAuthorizationManager) throws Exception {
+		MfaAuthenticationHandler mfaAuthenticationHandler = new MfaAuthenticationHandler("/second-factor");
+		http.authorizeHttpRequests((authz) -> authz.mvcMatchers("/second-factor", "/third-factor")
+				.access(mfaAuthorizationManager).anyRequest().authenticated())
+				.formLogin((form) -> form.successHandler(mfaAuthenticationHandler)
+						.failureHandler(mfaAuthenticationHandler))
+				.exceptionHandling((exceptions) -> exceptions
+						.withObjectPostProcessor(new ObjectPostProcessor<ExceptionTranslationFilter>() {
+							@Override
+							public <O extends ExceptionTranslationFilter> O postProcess(O filter) {
+								filter.setAuthenticationTrustResolver(new MfaTrustResolver());
+								return filter;
+							}
+						}));
+
+		return http.build();
+	}
+
+	@Bean
+	AuthorizationManager<RequestAuthorizationContext> mfaAuthorizationManager() {
+		return (authentication,
+				context) -> new AuthorizationDecision(authentication.get() instanceof MfaAuthentication);
+	}
+
+	// for the second-factor
+	@Bean
+	AesBytesEncryptor encryptor() throws Exception {
+		KeyGenerator generator = KeyGenerator.getInstance("AES");
+		generator.init(128);
+		SecretKey key = generator.generateKey();
+		return new AesBytesEncryptor(key, KeyGenerators.secureRandom(12), AesBytesEncryptor.CipherAlgorithm.GCM);
+	}
+
+	// for the third-factor
+	@Bean
+	PasswordEncoder encoder() {
+		return PasswordEncoderFactories.createDelegatingPasswordEncoder();
+	}
+
+	@Bean
+	AuthenticationSuccessHandler successHandler() {
+		return new SavedRequestAwareAuthenticationSuccessHandler();
+	}
+
+	@Bean
+	AuthenticationFailureHandler failureHandler() {
+		return new SimpleUrlAuthenticationFailureHandler("/login?error");
+	}
+
+}

servlet/spring-boot/java/authentication/username-password/mfa/src/main/resources/templates/index.html

@@ -0,0 +1,9 @@
+<html xmlns:th="https://www.thymeleaf.org">
+<head>
+    <title>Hello Security!</title>
+</head>
+<body>
+    <h1>Hello Security</h1>
+    <a th:href="@{/logout}">Log Out</a>
+</body>
+</html>

servlet/spring-boot/java/authentication/username-password/mfa/src/main/resources/templates/second-factor.html

@@ -0,0 +1,24 @@
+<!--
+  ~ 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.
+  -->
+
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="https://www.thymeleaf.org">
+    <body>
+        <form th:action="@{/second-factor}" method="post">
+            <input name="code" placeholder="Enter Code"/>
+            <input type="submit" value="Submit"/>
+        </form>
+    </body>
+</html>

servlet/spring-boot/java/authentication/username-password/mfa/src/main/resources/templates/third-factor.html

@@ -0,0 +1,24 @@
+<!--
+  ~ 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.
+  -->
+
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="https://www.thymeleaf.org">
+    <body>
+        <form th:action="@{/third-factor}" method="post">
+            <input name="answer" placeholder="Mother's Maiden Name"/>
+            <input type="submit" value="Submit"/>
+        </form>
+    </body>
+</html>

servlet/spring-boot/java/authentication/username-password/mfa/src/test/java/example/MfaApplicationTests.java

@@ -0,0 +1,188 @@
+/*
+ * 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 javax.servlet.http.HttpSession;
+
+import com.j256.twofactorauth.TimeBasedOneTimePasswordUtil;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.mock.web.MockHttpSession;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.MvcResult;
+
+import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestBuilders.formLogin;
+import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.csrf;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.redirectedUrl;
+
+/**
+ * @author Rob Winch
+ */
+@SpringBootTest
+@AutoConfigureMockMvc
+public class MfaApplicationTests {
+
+	private static final String hexKey = "80ed266dd80bcd32564f0f4aaa8d9b149a2b1eaa";
+
+	@Autowired
+	private MockMvc mockMvc;
+
+	@Test
+	void mfaWhenAllFactorsSucceedMatchesThenWorks() throws Exception {
+		// @formatter:off
+		MvcResult result = this.mockMvc.perform(formLogin()
+				.user("user@example.com")
+				.password("password"))
+				.andExpect(redirectedUrl("/second-factor"))
+				.andReturn();
+
+		HttpSession session = result.getRequest().getSession();
+
+		Integer code = TimeBasedOneTimePasswordUtil.generateCurrentNumberHex(hexKey);
+		this.mockMvc.perform(post("/second-factor")
+				.session((MockHttpSession) session)
+				.param("code", String.valueOf(code))
+				.with(csrf()))
+				.andExpect(redirectedUrl("/third-factor"));
+
+		this.mockMvc.perform(post("/third-factor")
+				.session((MockHttpSession) session)
+				.param("answer", "smith")
+				.with(csrf()))
+				.andExpect(redirectedUrl("/"));
+		// @formatter:on
+	}
+
+	@Test
+	void mfaWhenBadCredsThenStillRequestsRemainingFactorsAndRedirects() throws Exception {
+		// @formatter:off
+		MvcResult result = this.mockMvc.perform(formLogin()
+				.user("user@example.com")
+				.password("wrongpassword"))
+				.andExpect(redirectedUrl("/second-factor"))
+				.andReturn();
+
+		HttpSession session = result.getRequest().getSession();
+
+		Integer code = TimeBasedOneTimePasswordUtil.generateCurrentNumberHex(hexKey);
+		this.mockMvc.perform(post("/second-factor")
+				.session((MockHttpSession) session)
+				.param("code", String.valueOf(code))
+				.with(csrf()))
+				.andExpect(redirectedUrl("/third-factor"));
+
+		this.mockMvc.perform(post("/third-factor")
+				.session((MockHttpSession) session)
+				.param("answer", "smith")
+				.with(csrf()))
+				.andExpect(redirectedUrl("/login?error"));
+		// @formatter:on
+	}
+
+	@Test
+	void mfaWhenWrongCodeThenRedirects() throws Exception {
+		// @formatter:off
+		MvcResult result = this.mockMvc.perform(formLogin()
+				.user("user@example.com")
+				.password("password"))
+				.andExpect(redirectedUrl("/second-factor"))
+				.andReturn();
+
+		HttpSession session = result.getRequest().getSession();
+
+		Integer code = TimeBasedOneTimePasswordUtil.generateCurrentNumberHex(hexKey) - 1;
+		this.mockMvc.perform(post("/second-factor")
+				.session((MockHttpSession) session)
+				.param("code", String.valueOf(code))
+				.with(csrf()))
+				.andExpect(redirectedUrl("/third-factor"));
+
+		this.mockMvc.perform(post("/third-factor")
+				.session((MockHttpSession) session)
+				.param("answer", "smith")
+				.with(csrf()))
+				.andExpect(redirectedUrl("/login?error"));
+		// @formatter:on
+	}
+
+	@Test
+	void mfaWhenWrongSecurityAnswerThenRedirects() throws Exception {
+		// @formatter:off
+		MvcResult result = this.mockMvc.perform(formLogin()
+				.user("user@example.com")
+				.password("password"))
+				.andExpect(redirectedUrl("/second-factor"))
+				.andReturn();
+
+		HttpSession session = result.getRequest().getSession();
+
+		Integer code = TimeBasedOneTimePasswordUtil.generateCurrentNumberHex(hexKey);
+		this.mockMvc.perform(post("/second-factor")
+				.session((MockHttpSession) session)
+				.param("code", String.valueOf(code))
+				.with(csrf()))
+				.andExpect(redirectedUrl("/third-factor"));
+
+		this.mockMvc.perform(post("/third-factor")
+				.session((MockHttpSession) session)
+				.param("answer", "wilson")
+				.with(csrf()))
+				.andExpect(redirectedUrl("/login?error"));
+		// @formatter:on
+	}
+
+	@Test
+	void mfaWhenInProcessThenCantViewOtherPages() throws Exception {
+		// @formatter:off
+		MvcResult result = this.mockMvc.perform(formLogin()
+				.user("user@example.com")
+				.password("password"))
+				.andExpect(redirectedUrl("/second-factor"))
+				.andReturn();
+
+		HttpSession session = result.getRequest().getSession();
+
+		this.mockMvc.perform(get("/")
+				.session((MockHttpSession) session))
+				.andExpect(redirectedUrl("http://localhost/login"));
+
+		result = this.mockMvc.perform(formLogin()
+				.user("user@example.com")
+				.password("password"))
+				.andExpect(redirectedUrl("/second-factor"))
+				.andReturn();
+
+		session = result.getRequest().getSession();
+
+		Integer code = TimeBasedOneTimePasswordUtil.generateCurrentNumberHex(hexKey);
+		this.mockMvc.perform(post("/second-factor")
+				.session((MockHttpSession) session)
+				.param("code", String.valueOf(code))
+				.with(csrf()))
+				.andExpect(redirectedUrl("/third-factor"));
+
+		this.mockMvc.perform(get("/")
+				.session((MockHttpSession) session))
+				.andExpect(redirectedUrl("http://localhost/login"));
+		// @formatter:on
+	}
+
+}

settings.gradle

@@ -40,6 +40,7 @@ include ":servlet:java-configuration:hello-security"
 include ":servlet:java-configuration:hello-security-explicit"
 include ":servlet:java-configuration:max-sessions"
 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"
 include ":servlet:spring-boot:java:hello-security"
 include ":servlet:spring-boot:java:hello-security-explicit"