Merge branch 'feature/session-timeout'

# Conflicts:
#	src/main/resources/static/css/main.css.map

script/portal/oracle/5_ptl_user_session.sql

@@ -0,0 +1,36 @@
+-- =============================================================================
+-- 세션 타이머 / 유휴 자동 로그아웃 / 중복로그인 처리용 사용자 세션 추적 테이블
+-- 대상: EMS 스키마 소유자(EMSAPP 등)로 접속하여 실행
+-- 엔티티: com.eactive.apim.portal.apps.session.entity.UserSession
+-- =============================================================================
+
+CREATE TABLE PTL_USER_SESSION
+(
+    SESSION_ID       VARCHAR2(128)  NOT NULL,
+    USER_ID          VARCHAR2(36)   NOT NULL,
+    LOGIN_ID         VARCHAR2(200)  NOT NULL,
+    LOGIN_TIME       TIMESTAMP(6)   NOT NULL,
+    LAST_ACCESS_TIME TIMESTAMP(6)   NOT NULL,
+    IP_ADDRESS       VARCHAR2(45),
+    USER_AGENT       VARCHAR2(500),
+    FORCE_LOGOUT     CHAR(1)        DEFAULT 'N' NOT NULL,
+    CONSTRAINT PK_PTL_USER_SESSION PRIMARY KEY (SESSION_ID)
+);
+
+-- 중복로그인 강제 로그아웃 / 활성 세션 조회는 LOGIN_ID 기준
+CREATE INDEX IX_PTL_USER_SESSION_LOGIN ON PTL_USER_SESSION (LOGIN_ID);
+
+COMMENT ON TABLE  PTL_USER_SESSION                  IS '포털 사용자 세션 추적 (타이머/유휴 로그아웃/중복로그인)';
+COMMENT ON COLUMN PTL_USER_SESSION.SESSION_ID       IS 'HTTP 세션 ID (PK)';
+COMMENT ON COLUMN PTL_USER_SESSION.USER_ID          IS '포털 사용자 ID';
+COMMENT ON COLUMN PTL_USER_SESSION.LOGIN_ID         IS '로그인 ID (이메일, 소문자)';
+COMMENT ON COLUMN PTL_USER_SESSION.LOGIN_TIME       IS '로그인 시각';
+COMMENT ON COLUMN PTL_USER_SESSION.LAST_ACCESS_TIME IS '마지막 접근 시각 (만료 판단 기준)';
+COMMENT ON COLUMN PTL_USER_SESSION.IP_ADDRESS       IS '접속 IP';
+COMMENT ON COLUMN PTL_USER_SESSION.USER_AGENT       IS 'User-Agent';
+COMMENT ON COLUMN PTL_USER_SESSION.FORCE_LOGOUT     IS '강제 로그아웃 플래그 (Y/N)';
+
+-- (선택) 세션 타임아웃(분) 설정값을 미리 지정. 미삽입 시 최초 접근 때 기본값 15로 자동 생성됨.
+-- INSERT INTO PTL_PROPERTY (PROPERTY_GROUP_NAME, PROPERTY_NAME, PROPERTY_VALUE, PROPERTY_DESC)
+-- VALUES ('Portal', 'session.timeout.minutes', '15', '세션 타임아웃 시간 (분)');
+-- COMMIT;

src/main/java/com/eactive/apim/portal/apps/session/controller/SessionApiController.java

@@ -0,0 +1,130 @@
+package com.eactive.apim.portal.apps.session.controller;
+
+import com.eactive.apim.portal.apps.session.entity.UserSession;
+import com.eactive.apim.portal.apps.session.service.UserSessionService;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpSession;
+import java.time.format.DateTimeFormatter;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+
+/**
+ * 세션 타이머/유휴 로그아웃/중복로그인 처리용 REST API.
+ *
+ * <ul>
+ *   <li>GET  /api/session/status         - 잔여 시간/유효성 폴링 (인증 필요)</li>
+ *   <li>POST /api/session/heartbeat      - 세션 연장 (lastAccessTime 갱신)</li>
+ *   <li>POST /api/session/check-duplicate - 로그인 전 중복 세션 확인 (CSRF 예외)</li>
+ * </ul>
+ */
+@Slf4j
+@RestController
+@RequestMapping("/api/session")
+@RequiredArgsConstructor
+public class SessionApiController {
+
+    private static final DateTimeFormatter TIME_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
+
+    private final UserSessionService userSessionService;
+
+    /**
+     * 로그인 전 중복 세션 확인
+     */
+    @PostMapping("/check-duplicate")
+    public ResponseEntity<Map<String, Object>> checkDuplicate(@RequestParam("loginId") String loginId) {
+        Map<String, Object> result = new HashMap<>();
+        String normalizedLoginId = loginId != null ? loginId.toLowerCase() : "";
+
+        Optional<UserSession> activeSession = userSessionService.getActiveSession(normalizedLoginId);
+
+        if (activeSession.isPresent()) {
+            UserSession session = activeSession.get();
+            result.put("duplicateSession", true);
+            result.put("ipAddress", maskIpAddress(session.getIpAddress()));
+            result.put("loginTime", session.getLoginTime().format(TIME_FORMATTER));
+        } else {
+            result.put("duplicateSession", false);
+        }
+
+        return ResponseEntity.ok(result);
+    }
+
+    /**
+     * 세션 상태 폴링 (인증 필요)
+     */
+    @GetMapping("/status")
+    public ResponseEntity<Map<String, Object>> getSessionStatus(HttpServletRequest request) {
+        Map<String, Object> result = new HashMap<>();
+        HttpSession httpSession = request.getSession(false);
+
+        if (httpSession == null) {
+            result.put("valid", false);
+            result.put("remainingSeconds", 0);
+            return ResponseEntity.ok(result);
+        }
+
+        String sessionId = httpSession.getId();
+        boolean forceLoggedOut = userSessionService.isForceLoggedOut(sessionId);
+
+        if (forceLoggedOut) {
+            result.put("valid", false);
+            result.put("remainingSeconds", 0);
+        } else {
+            long remaining = userSessionService.getRemainingSeconds(sessionId);
+            result.put("valid", remaining > 0);
+            result.put("remainingSeconds", remaining);
+        }
+
+        return ResponseEntity.ok(result);
+    }
+
+    /**
+     * 하트비트 - lastAccessTime 갱신 (세션 연장)
+     */
+    @PostMapping("/heartbeat")
+    public ResponseEntity<Map<String, Object>> heartbeat(HttpServletRequest request) {
+        Map<String, Object> result = new HashMap<>();
+        HttpSession httpSession = request.getSession(false);
+
+        if (httpSession == null) {
+            result.put("remainingSeconds", 0);
+            return ResponseEntity.ok(result);
+        }
+
+        String sessionId = httpSession.getId();
+        userSessionService.updateLastAccessTime(sessionId);
+        long remaining = userSessionService.getRemainingSeconds(sessionId);
+        result.put("remainingSeconds", remaining);
+
+        return ResponseEntity.ok(result);
+    }
+
+    /**
+     * IP 주소 마스킹 (3번째 옥텟을 ***로 치환)
+     * 예: 192.168.240.178 → 192.168.***.178
+     */
+    private String maskIpAddress(String ip) {
+        if (ip == null || ip.isEmpty()) {
+            return "알 수 없음";
+        }
+        String[] parts = ip.split("\\.");
+        if (parts.length == 4) {
+            return parts[0] + "." + parts[1] + ".***." + parts[3];
+        }
+        // IPv6 등 다른 형식은 일부만 표시
+        if (ip.length() > 8) {
+            return ip.substring(0, 4) + "****" + ip.substring(ip.length() - 4);
+        }
+        return "***";
+    }
+}

src/main/java/com/eactive/apim/portal/apps/session/entity/UserSession.java

@@ -0,0 +1,54 @@
+package com.eactive.apim.portal.apps.session.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Table;
+import java.time.LocalDateTime;
+
+/**
+ * 사용자 세션 추적 엔티티 (EMS 스키마, PTL_USER_SESSION)
+ *
+ * <p>화면 세션 타이머/유휴 자동 로그아웃 및 중복로그인 강제 로그아웃에 사용된다.
+ * {@code lastAccessTime} + 타임아웃(분) 이 세션 만료의 기준이며, {@code forceLogout='Y'} 인 세션은
+ * 다음 요청 시 {@link com.eactive.apim.portal.apps.session.filter.SessionValidationFilter} 가 강제 로그아웃한다.
+ */
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+@Entity
+@Table(name = "PTL_USER_SESSION")
+public class UserSession {
+
+    @Id
+    @Column(name = "SESSION_ID", length = 128, nullable = false)
+    private String sessionId;
+
+    @Column(name = "USER_ID", length = 36, nullable = false)
+    private String userId;
+
+    @Column(name = "LOGIN_ID", length = 200, nullable = false)
+    private String loginId;
+
+    @Column(name = "LOGIN_TIME", nullable = false)
+    private LocalDateTime loginTime;
+
+    @Column(name = "LAST_ACCESS_TIME", nullable = false)
+    private LocalDateTime lastAccessTime;
+
+    @Column(name = "IP_ADDRESS", length = 45)
+    private String ipAddress;
+
+    @Column(name = "USER_AGENT", length = 500)
+    private String userAgent;
+
+    @Column(name = "FORCE_LOGOUT", length = 1, nullable = false)
+    @Builder.Default
+    private String forceLogout = "N";
+}

src/main/java/com/eactive/apim/portal/apps/session/filter/SessionValidationFilter.java

@@ -0,0 +1,124 @@
+package com.eactive.apim.portal.apps.session.filter;
+
+import com.eactive.apim.portal.apps.session.service.UserSessionService;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.stereotype.Component;
+import org.springframework.web.filter.OncePerRequestFilter;
+
+import javax.servlet.FilterChain;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpSession;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * 인증 사용자 요청마다 DB 세션 상태를 검증한다.
+ *
+ * <ol>
+ *   <li>강제 로그아웃(forceLogout='Y') 감지 시 세션 무효화 후 {@code /login?forceLogout=true}</li>
+ *   <li>잔여 시간 만료 시 세션 무효화 후 {@code /login?expired=true}</li>
+ *   <li>그 외에는 60초 스로틀로 lastAccessTime 갱신 (실제 활동 반영)</li>
+ * </ol>
+ */
+@Slf4j
+@Component
+@RequiredArgsConstructor
+public class SessionValidationFilter extends OncePerRequestFilter {
+
+    private static final String LAST_DB_UPDATE_ATTR = "SESSION_LAST_DB_UPDATE";
+    private static final long DB_UPDATE_THROTTLE_MS = 60_000; // 60초 스로틀링
+
+    private static final List<String> EXCLUDED_PREFIXES = Arrays.asList(
+            "/api/session/",
+            "/login",
+            "/actionLogin.do",
+            "/actionLogout.do",
+            "/css/",
+            "/js/",
+            "/img/",
+            "/plugins/",
+            "/fonts/",
+            "/favicon.ico",
+            "/error",
+            "/health"
+    );
+
+    private final UserSessionService userSessionService;
+
+    @Override
+    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,
+                                    FilterChain filterChain) throws ServletException, IOException {
+
+        String path = request.getRequestURI();
+        String contextPath = request.getContextPath();
+        if (contextPath != null && !contextPath.isEmpty()) {
+            path = path.substring(contextPath.length());
+        }
+
+        // 제외 경로 체크
+        if (isExcludedPath(path)) {
+            filterChain.doFilter(request, response);
+            return;
+        }
+
+        // 인증되지 않은 요청은 통과
+        Authentication auth = SecurityContextHolder.getContext().getAuthentication();
+        if (auth == null || !auth.isAuthenticated() || "anonymousUser".equals(auth.getPrincipal())) {
+            filterChain.doFilter(request, response);
+            return;
+        }
+
+        HttpSession httpSession = request.getSession(false);
+        if (httpSession == null) {
+            filterChain.doFilter(request, response);
+            return;
+        }
+
+        String sessionId = httpSession.getId();
+
+        // 1. 강제 로그아웃 체크 (중복 로그인)
+        if (userSessionService.isForceLoggedOut(sessionId)) {
+            log.info("강제 로그아웃 감지 - sessionId: {}", sessionId);
+            userSessionService.removeSession(sessionId);
+            httpSession.invalidate();
+            SecurityContextHolder.clearContext();
+            response.sendRedirect(contextPath + "/login?forceLogout=true");
+            return;
+        }
+
+        // 2. 세션 만료 체크 (DB 레코드 없거나 잔여 0)
+        long remaining = userSessionService.getRemainingSeconds(sessionId);
+        if (remaining <= 0) {
+            userSessionService.removeSession(sessionId);
+            httpSession.invalidate();
+            SecurityContextHolder.clearContext();
+            response.sendRedirect(contextPath + "/login?expired=true");
+            return;
+        }
+
+        // 3. lastAccessTime 갱신 (60초 스로틀링)
+        Long lastUpdate = (Long) httpSession.getAttribute(LAST_DB_UPDATE_ATTR);
+        long now = System.currentTimeMillis();
+        if (lastUpdate == null || (now - lastUpdate) > DB_UPDATE_THROTTLE_MS) {
+            userSessionService.updateLastAccessTime(sessionId);
+            httpSession.setAttribute(LAST_DB_UPDATE_ATTR, now);
+        }
+
+        filterChain.doFilter(request, response);
+    }
+
+    private boolean isExcludedPath(String path) {
+        for (String prefix : EXCLUDED_PREFIXES) {
+            if (path.startsWith(prefix)) {
+                return true;
+            }
+        }
+        return false;
+    }
+}

src/main/java/com/eactive/apim/portal/apps/session/repository/UserSessionRepository.java

@@ -0,0 +1,29 @@
+package com.eactive.apim.portal.apps.session.repository;
+
+import com.eactive.apim.portal.apps.session.entity.UserSession;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+import org.springframework.stereotype.Repository;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+@Repository
+public interface UserSessionRepository extends JpaRepository<UserSession, String> {
+
+    List<UserSession> findByLoginId(String loginId);
+
+    @Modifying
+    @Query("UPDATE UserSession s SET s.forceLogout = 'Y' WHERE s.loginId = :loginId AND s.sessionId <> :currentSessionId")
+    int forceLogoutOtherSessions(@Param("loginId") String loginId, @Param("currentSessionId") String currentSessionId);
+
+    @Modifying
+    @Query("DELETE FROM UserSession s WHERE s.lastAccessTime < :cutoffTime")
+    int deleteExpiredSessions(@Param("cutoffTime") LocalDateTime cutoffTime);
+
+    @Modifying
+    @Query("UPDATE UserSession s SET s.lastAccessTime = :now WHERE s.sessionId = :sessionId")
+    int updateLastAccessTime(@Param("sessionId") String sessionId, @Param("now") LocalDateTime now);
+}

src/main/java/com/eactive/apim/portal/apps/session/service/UserSessionService.java

@@ -0,0 +1,156 @@
+package com.eactive.apim.portal.apps.session.service;
+
+import com.eactive.apim.portal.apps.session.entity.UserSession;
+import com.eactive.apim.portal.apps.session.repository.UserSessionRepository;
+import com.eactive.apim.portal.portalproperty.service.PortalPropertyService;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.time.Duration;
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.Optional;
+
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class UserSessionService {
+
+    private static final String PROPERTY_GROUP = "Portal";
+    private static final String PROPERTY_NAME = "session.timeout.minutes";
+    private static final String DEFAULT_TIMEOUT_MINUTES = "15";
+
+    private final UserSessionRepository userSessionRepository;
+    private final PortalPropertyService portalPropertyService;
+
+    /**
+     * 활성 세션 존재 여부 확인 (만료되지 않고 강제 로그아웃되지 않은 세션)
+     */
+    @Transactional(readOnly = true)
+    public Optional<UserSession> getActiveSession(String loginId) {
+        int timeoutMinutes = getSessionTimeoutMinutes();
+        LocalDateTime cutoff = LocalDateTime.now().minusMinutes(timeoutMinutes);
+
+        List<UserSession> sessions = userSessionRepository.findByLoginId(loginId);
+        return sessions.stream()
+                .filter(s -> "N".equals(s.getForceLogout()))
+                .filter(s -> s.getLastAccessTime().isAfter(cutoff))
+                .findFirst();
+    }
+
+    /**
+     * 새 세션 등록
+     */
+    @Transactional
+    public void registerSession(String sessionId, String userId, String loginId, String ipAddress, String userAgent) {
+        UserSession session = UserSession.builder()
+                .sessionId(sessionId)
+                .userId(userId)
+                .loginId(loginId)
+                .loginTime(LocalDateTime.now())
+                .lastAccessTime(LocalDateTime.now())
+                .ipAddress(ipAddress)
+                .userAgent(truncate(userAgent, 500))
+                .forceLogout("N")
+                .build();
+        userSessionRepository.save(session);
+        log.info("세션 등록 - loginId: {}, sessionId: {}, ip: {}", loginId, sessionId, ipAddress);
+    }
+
+    /**
+     * 다른 세션 강제 로그아웃 플래그 설정 (중복 로그인 방지)
+     */
+    @Transactional
+    public void forceLogoutOtherSessions(String loginId, String currentSessionId) {
+        int count = userSessionRepository.forceLogoutOtherSessions(loginId, currentSessionId);
+        if (count > 0) {
+            log.info("강제 로그아웃 처리 - loginId: {}, 대상 세션 수: {}", loginId, count);
+        }
+    }
+
+    /**
+     * 현재 세션의 강제 로그아웃 여부 확인
+     */
+    @Transactional(readOnly = true)
+    public boolean isForceLoggedOut(String sessionId) {
+        return userSessionRepository.findById(sessionId)
+                .map(s -> "Y".equals(s.getForceLogout()))
+                .orElse(false);
+    }
+
+    /**
+     * 세션 삭제
+     */
+    @Transactional
+    public void removeSession(String sessionId) {
+        if (userSessionRepository.existsById(sessionId)) {
+            userSessionRepository.deleteById(sessionId);
+            log.debug("세션 삭제 - sessionId: {}", sessionId);
+        }
+    }
+
+    /**
+     * 마지막 접근 시간 갱신 (세션 연장)
+     */
+    @Transactional
+    public void updateLastAccessTime(String sessionId) {
+        userSessionRepository.updateLastAccessTime(sessionId, LocalDateTime.now());
+    }
+
+    /**
+     * DB(PortalProperty)에서 세션 타임아웃 값 조회 (분)
+     */
+    public int getSessionTimeoutMinutes() {
+        String value = portalPropertyService.getOrCreateProperty(
+                PROPERTY_GROUP,
+                PROPERTY_NAME,
+                DEFAULT_TIMEOUT_MINUTES,
+                "세션 타임아웃 시간 (분)"
+        );
+        try {
+            return Integer.parseInt(value.trim());
+        } catch (NumberFormatException e) {
+            log.warn("세션 타임아웃 값 파싱 실패: {}, 기본값 {}분 사용", value, DEFAULT_TIMEOUT_MINUTES);
+            return Integer.parseInt(DEFAULT_TIMEOUT_MINUTES);
+        }
+    }
+
+    /**
+     * 세션의 잔여 시간(초) 계산. 세션 레코드가 없으면 0.
+     */
+    @Transactional(readOnly = true)
+    public long getRemainingSeconds(String sessionId) {
+        int timeoutMinutes = getSessionTimeoutMinutes();
+        return userSessionRepository.findById(sessionId)
+                .map(s -> {
+                    LocalDateTime expireTime = s.getLastAccessTime().plusMinutes(timeoutMinutes);
+                    long remaining = Duration.between(LocalDateTime.now(), expireTime).getSeconds();
+                    return Math.max(0, remaining);
+                })
+                .orElse(0L);
+    }
+
+    /**
+     * 만료 세션 정리 (5분 주기). 타임아웃의 2배 이상 지난 세션 삭제 (안전 마진).
+     */
+    @Scheduled(fixedRate = 300000)
+    @Transactional
+    public void cleanupExpiredSessions() {
+        int timeoutMinutes = getSessionTimeoutMinutes();
+        LocalDateTime cutoff = LocalDateTime.now().minusMinutes((long) timeoutMinutes * 2);
+        int deleted = userSessionRepository.deleteExpiredSessions(cutoff);
+        if (deleted > 0) {
+            log.info("만료 세션 정리 - 삭제 수: {}", deleted);
+        }
+    }
+
+    private String truncate(String value, int maxLength) {
+        if (value == null) {
+            return null;
+        }
+        return value.length() > maxLength ? value.substring(0, maxLength) : value;
+    }
+}

src/main/java/com/eactive/apim/portal/common/breadcrumb/GlobalControllerAdvice.java

@@ -8,6 +8,7 @@ import org.springframework.web.bind.annotation.ControllerAdvice;
 import org.springframework.web.bind.annotation.ModelAttribute;
 import com.eactive.apim.portal.portalproperty.service.PortalPropertyService;
 import com.eactive.apim.portal.config.PortalProperties;
+import com.eactive.apim.portal.apps.session.service.UserSessionService;
 
 @ControllerAdvice
 public class GlobalControllerAdvice {
@@ -21,6 +22,9 @@ public class GlobalControllerAdvice {
     @Autowired
     private PortalProperties portalProperties;
 
+    @Autowired
+    private UserSessionService userSessionService;
+
     @ModelAttribute("breadcrumb")
     public List<Map> addBreadcrumbToModel(HttpServletRequest request) {
         String currentPath = request.getRequestURI();
@@ -58,4 +62,12 @@ public class GlobalControllerAdvice {
         }
         return null;
     }
+
+    /**
+     * 화면 세션 타이머 기준이 되는 타임아웃(분). PortalProperty(Portal/session.timeout.minutes)에서 조회.
+     */
+    @ModelAttribute("sessionTimeoutMinutes")
+    public int sessionTimeoutMinutes() {
+        return userSessionService.getSessionTimeoutMinutes();
+    }
 }

src/main/java/com/eactive/apim/portal/config/PortalAuthenticationSuccessHandler.java

@@ -1,5 +1,6 @@
 package com.eactive.apim.portal.config;
 
+import com.eactive.apim.portal.apps.session.service.UserSessionService;
 import com.eactive.apim.portal.apps.user.repository.PortalOrgRepository;
 import com.eactive.apim.portal.apps.user.service.PortalUserLogService;
 import com.eactive.apim.portal.common.util.HttpRequestUtil;
@@ -49,6 +50,7 @@ public class PortalAuthenticationSuccessHandler implements AuthenticationSuccess
     private final MessageRequestRepository messageRequestRepository;
     private final UserInvitationRepository userInvitationRepository;
     private final PortalOrgRepository portalOrgRepository;
+    private final UserSessionService userSessionService;
 
     @Override
     public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response,
@@ -112,6 +114,12 @@ public class PortalAuthenticationSuccessHandler implements AuthenticationSuccess
             }
         }
 
+        // 중복 로그인 방지: 기존 세션 강제 로그아웃 플래그 설정 + 현재 세션 등록
+        String clientIp = HttpRequestUtil.getClientIpAddress(request);
+        userSessionService.forceLogoutOtherSessions(normalizedUsername, sessionId);
+        userSessionService.registerSession(sessionId, String.valueOf(user.getId()), normalizedUsername,
+            clientIp, request.getHeader("User-Agent"));
+
         // 로그인 성공 시 세션 정보 로깅
         logLoginSuccess(request, session, username);
 

src/main/java/com/eactive/apim/portal/config/PortalConfigSecurity.java

@@ -1,6 +1,7 @@
 package com.eactive.apim.portal.config;
 
 
+import com.eactive.apim.portal.apps.session.filter.SessionValidationFilter;
 import com.navercorp.lucy.security.xss.servletfilter.XssEscapeServletFilter;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.web.servlet.FilterRegistrationBean;
@@ -10,9 +11,8 @@ import org.springframework.security.config.annotation.method.configuration.Enabl
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
 import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
 import org.springframework.security.config.http.SessionCreationPolicy;
-import org.springframework.security.core.session.SessionRegistry;
-import org.springframework.security.core.session.SessionRegistryImpl;
 import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
 import org.springframework.security.web.csrf.CookieCsrfTokenRepository;
 import org.springframework.security.web.session.HttpSessionEventPublisher;
 import org.springframework.security.web.util.matcher.AntPathRequestMatcher;
@@ -33,15 +33,30 @@ public class PortalConfigSecurity {
 
     private final PortalLogoutSuccessHandler logoutSuccessHandler;
 
+    private final SessionValidationFilter sessionValidationFilter;
+
     @Autowired
     public PortalConfigSecurity(PortalAuthenticationFailureHandler authenticationFailureHandler,
         PortalAuthenticationSuccessHandler authenticationSuccessHandler,
         PortalAuthenticationManager portalAuthenticationManager,
-        PortalLogoutSuccessHandler logoutSuccessHandler) {
+        PortalLogoutSuccessHandler logoutSuccessHandler,
+        SessionValidationFilter sessionValidationFilter) {
         this.authenticationFailureHandler = authenticationFailureHandler;
         this.authenticationSuccessHandler = authenticationSuccessHandler;
         this.portalAuthenticationManager = portalAuthenticationManager;
         this.logoutSuccessHandler = logoutSuccessHandler;
+        this.sessionValidationFilter = sessionValidationFilter;
+    }
+
+    /**
+     * {@link SessionValidationFilter}가 Spring Security 필터 체인에서만 동작하도록
+     * 서블릿 컨테이너의 자동 등록을 비활성화한다.
+     */
+    @Bean
+    public FilterRegistrationBean<SessionValidationFilter> sessionValidationFilterRegistration(SessionValidationFilter filter) {
+        FilterRegistrationBean<SessionValidationFilter> registration = new FilterRegistrationBean<>(filter);
+        registration.setEnabled(false);
+        return registration;
     }
 
     @Bean
@@ -79,17 +94,15 @@ public class PortalConfigSecurity {
                 .csrf(csrf -> csrf
                     .csrfTokenRepository(CookieCsrfTokenRepository.withHttpOnlyFalse())
                     .ignoringRequestMatchers(new AntPathRequestMatcher("/_proxy/**/*"))
+                    .ignoringRequestMatchers(new AntPathRequestMatcher("/api/session/check-duplicate"))
                 )
+                // 중복로그인/유휴 만료는 DB 기반 SessionValidationFilter가 처리 (maximumSessions 미사용)
                 .sessionManagement(session -> session
                     .sessionCreationPolicy(SessionCreationPolicy.IF_REQUIRED)
-                    .maximumSessions(1) // Allow only one session per user
-                    .maxSessionsPreventsLogin(false) // Prevent new login when session limit is reached
-                    .expiredUrl("/login?expired") // Redirect when session expires
-                    .sessionRegistry(sessionRegistry()) // Session registry bean to track sessions
-                    .and()
                     .sessionFixation()
                     .changeSessionId()
-                );
+                )
+                .addFilterBefore(sessionValidationFilter, UsernamePasswordAuthenticationFilter.class);
 
             return http.build();
         } catch (Exception e) {
@@ -97,11 +110,6 @@ public class PortalConfigSecurity {
         }
     }
 
-    @Bean
-    public SessionRegistry sessionRegistry() {
-        return new SessionRegistryImpl();
-    }
-
     @Bean
     public HttpSessionEventPublisher httpSessionEventPublisher() {
         return new HttpSessionEventPublisher();

src/main/java/com/eactive/apim/portal/config/PortalLogoutSuccessHandler.java

@@ -1,5 +1,6 @@
 package com.eactive.apim.portal.config;
 
+import com.eactive.apim.portal.apps.session.service.UserSessionService;
 import com.eactive.apim.portal.common.util.HttpRequestUtil;
 import com.eactive.apim.portal.common.util.StringRepeatUtil;
 import org.slf4j.Logger;
@@ -26,12 +27,21 @@ public class PortalLogoutSuccessHandler implements LogoutSuccessHandler {
     private static final Logger sessionLogger = LoggerFactory.getLogger("eapim.portal.session");
     private static final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS");
 
+    private final UserSessionService userSessionService;
+
+    public PortalLogoutSuccessHandler(UserSessionService userSessionService) {
+        this.userSessionService = userSessionService;
+    }
+
     @Override
     public void onLogoutSuccess(HttpServletRequest request, HttpServletResponse response,
                                 Authentication authentication) throws IOException, ServletException {
         HttpSession session = request.getSession(false);
 
         if (session != null) {
+            // DB 세션 레코드 정리 (중복세션 오탐 방지)
+            userSessionService.removeSession(session.getId());
+
             StringBuilder logMessage = new StringBuilder();
             logMessage.append("\n");
             logMessage.append(StringRepeatUtil.repeat('=', 80)).append("\n");

src/main/resources/static/css/main.css

@@ -5310,6 +5310,37 @@ select.form-control {
     right: -20px;
   }
 }
+.session-timer {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  white-space: nowrap;
+  font-size: 14px;
+  font-weight: 600;
+  color: #64748B;
+}
+.session-timer .session-timer-icon {
+  font-size: 12px;
+  color: #64748B;
+}
+.session-timer .session-timer-text {
+  font-variant-numeric: tabular-nums;
+  min-width: 40px;
+  text-align: center;
+}
+.session-timer .session-timer-text.session-timer-warning {
+  color: #e03131;
+  font-weight: 700;
+}
+
+.session-timer-mobile {
+  margin-right: 8px;
+  font-size: 12px;
+}
+.session-timer-mobile .session-timer-text {
+  min-width: 34px;
+}
+
 .data-table {
   width: 100%;
   background: #FFFFFF;

src/main/resources/static/sass/components/_session-timer.scss

@@ -0,0 +1,43 @@
+@use '../abstracts/variables' as *;
+
+// -----------------------------------------------------------------------------
+// Session Timer Component
+// 인증 사용자 헤더에 남은 세션 시간을 표시. 만료 임박(<=60s) 시 경고색.
+// -----------------------------------------------------------------------------
+
+.session-timer {
+  display: inline-flex;
+  align-items: center;
+  gap: $spacing-xs;
+  white-space: nowrap;
+  font-size: $font-size-sm;
+  font-weight: $font-weight-semibold;
+  color: $text-gray;
+
+  .session-timer-icon {
+    font-size: $font-size-xs;
+    color: $text-gray;
+  }
+
+  .session-timer-text {
+    // 카운트다운 중 폭 흔들림 방지
+    font-variant-numeric: tabular-nums;
+    min-width: 40px;
+    text-align: center;
+
+    &.session-timer-warning {
+      color: #e03131;
+      font-weight: $font-weight-bold;
+    }
+  }
+}
+
+// 모바일 헤더(햄버거 버튼 좌측)용 타이머
+.session-timer-mobile {
+  margin-right: $spacing-sm;
+  font-size: $font-size-xs;
+
+  .session-timer-text {
+    min-width: 34px;
+  }
+}

src/main/resources/static/sass/main.scss

@@ -35,6 +35,7 @@
 @use 'components/cta' as *;
 @use 'components/password-popup' as *;
 @use 'components/header-auth' as *;
+@use 'components/session-timer' as *;
 @use 'components/tables' as *;
 @use 'components/accordion' as *;
 @use 'components/page-title-banner' as *;

src/main/resources/templates/views/apps/login/login.html

@@ -19,6 +19,14 @@
                     <i class="fas fa-info-circle"></i>
                     <span>로그아웃되었습니다.</span>
                 </div>
+                <div th:if="${param.expired}" class="login-alert alert-info">
+                    <i class="fas fa-info-circle"></i>
+                    <span>장시간 미사용으로 세션이 만료되어 로그아웃되었습니다. 다시 로그인해주세요.</span>
+                </div>
+                <div th:if="${param.forceLogout}" class="login-alert alert-info">
+                    <i class="fas fa-info-circle"></i>
+                    <span>다른 기기 또는 브라우저에서 로그인되어 현재 세션이 종료되었습니다.</span>
+                </div>
 
                 <!-- Login Form -->
                 <form id="loginForm" role="form" name="loginForm" th:action="@{/actionLogin.do}" method="post" class="login-form">
@@ -107,6 +115,36 @@
             form.checkId.checked = ((form.id.value = getCookie('saveid')) !== null);
         }
 
+        // 로그인 전 중복 접속 확인 → 중복 시 기존 세션 강제 로그아웃 여부 질의
+        function checkDuplicateAndLogin(form) {
+            var loginId = form.id.value;
+            $.ajax({
+                url: /*[[@{/api/session/check-duplicate}]]*/ '/api/session/check-duplicate',
+                type: 'POST',
+                data: { loginId: loginId },
+                success: function (data) {
+                    if (data && data.duplicateSession) {
+                        $('#loginLoading').removeClass('active');
+                        var msg = '해당 계정은 이미 다른 곳(' + data.ipAddress + ')에서 접속 중입니다.<br>'
+                                + '접속 시각: ' + data.loginTime + '<br><br>'
+                                + '기존 접속을 해제하고 로그인하시겠습니까?';
+                        customPopups.showConfirm(msg, function (confirmed) {
+                            if (confirmed) {
+                                $('#loginLoading').addClass('active');
+                                form.submit();
+                            }
+                        });
+                    } else {
+                        form.submit();
+                    }
+                },
+                error: function () {
+                    // 중복 체크 실패 시 로그인은 그대로 진행
+                    form.submit();
+                }
+            });
+        }
+
         function fnInit() {
             let form = document.getElementById('loginForm');
             if (form) {
@@ -171,7 +209,7 @@
                         $('#loginLoading').removeClass('active');
                         customPopups.showAlert('[[#{login.passLengthShort}]]');
                     } else {
-                        form.submit();
+                        checkDuplicateAndLogin(form);
                     }
                 }
                 form.classList.add('was-validated');

src/main/resources/templates/views/fragment/djbank/header_container.html

@@ -64,6 +64,11 @@
             <!-- Logout State (Authenticated) -->
             <div class="auth-group authenticated" sec:authorize="isAuthenticated()">
               <div class="header-user-info">
+                <span class="session-timer" id="sessionTimer" title="남은 세션 시간">
+                  <i class="fas fa-clock session-timer-icon"></i>
+                  <span class="session-timer-text" id="sessionRemainingTime">--:--</span>
+                </span>
+                <span class="divider">•</span>
                 <div class="user-identity">
                   <img th:src="@{/img/user_icon.svg}" alt="User" class="user-icon">
                   <span class="user-name">[[${#authentication.principal.userName}]]님</span>
@@ -102,6 +107,10 @@
           </div>
 
           <div class="mobile-right">
+            <span class="session-timer session-timer-mobile" sec:authorize="isAuthenticated()" title="남은 세션 시간">
+              <i class="fas fa-clock session-timer-icon"></i>
+              <span class="session-timer-text">--:--</span>
+            </span>
             <button class="mobile-menu-btn" id="mobileMenuToggle" aria-label="메뉴">
               <span class="hamburger-line"></span>
               <span class="hamburger-line"></span>
@@ -243,6 +252,148 @@
 
 <!-- Mobile Menu & Dropdown JavaScript -->
 <th:block th:fragment="headerScript">
+  <!-- 세션 타이머 / 유휴 자동 로그아웃 / 연장 확인 (인증 사용자만) -->
+  <script sec:authorize="isAuthenticated()" th:inline="javascript">
+    (function () {
+      var STATUS_URL = /*[[@{/api/session/status}]]*/ '/api/session/status';
+      var HEARTBEAT_URL = /*[[@{/api/session/heartbeat}]]*/ '/api/session/heartbeat';
+      var EXPIRED_URL = /*[[@{/login?expired=true}]]*/ '/login?expired=true';
+      var FORCE_LOGOUT_URL = /*[[@{/login?forceLogout=true}]]*/ '/login?forceLogout=true';
+      var LOGOUT_URL = /*[[@{/actionLogout.do}]]*/ '/actionLogout.do';
+
+      var timeoutMinutes = /*[[${sessionTimeoutMinutes}]]*/ 15;
+      var remainingSeconds = timeoutMinutes * 60;
+      var WARNING_SECONDS = 60;       // 만료 60초 전 연장 확인 모달
+      var POLL_INTERVAL_MS = 30000;   // 서버 잔여시간 동기화 주기
+
+      // 데스크톱·모바일 타이머 텍스트를 모두 갱신 (id 대신 클래스 사용)
+      var timerTexts = document.querySelectorAll('.session-timer-text');
+      var countdownTimer = null;
+      var promptShown = false;        // 연장 확인 모달 중복 표시 방지
+      var redirecting = false;
+
+      function getCookie(name) {
+        var m = document.cookie.match('(^|;)\\s*' + name + '\\s*=\\s*([^;]+)');
+        return m ? decodeURIComponent(m.pop()) : '';
+      }
+
+      function csrfHeaders() {
+        var token = getCookie('XSRF-TOKEN');
+        return token ? { 'X-XSRF-TOKEN': token } : {};
+      }
+
+      function formatTime(sec) {
+        if (sec < 0) sec = 0;
+        var m = Math.floor(sec / 60);
+        var s = sec % 60;
+        return (m < 10 ? '0' : '') + m + ':' + (s < 10 ? '0' : '') + s;
+      }
+
+      function render() {
+        if (!timerTexts.length) return;
+        var label = formatTime(remainingSeconds);
+        var warn = remainingSeconds <= WARNING_SECONDS;
+        for (var i = 0; i < timerTexts.length; i++) {
+          timerTexts[i].textContent = label;
+          if (warn) {
+            timerTexts[i].classList.add('session-timer-warning');
+          } else {
+            timerTexts[i].classList.remove('session-timer-warning');
+          }
+        }
+      }
+
+      function goTo(url) {
+        if (redirecting) return;
+        redirecting = true;
+        if (countdownTimer) clearInterval(countdownTimer);
+        window.location.href = url;
+      }
+
+      function extendSession() {
+        $.ajax({
+          url: HEARTBEAT_URL,
+          type: 'POST',
+          headers: csrfHeaders(),
+          success: function (data) {
+            if (data && data.remainingSeconds > 0) {
+              remainingSeconds = data.remainingSeconds;
+              promptShown = false;
+              render();
+            } else {
+              goTo(EXPIRED_URL);
+            }
+          },
+          error: function () {
+            // 연장 실패 시 만료로 처리
+            goTo(EXPIRED_URL);
+          }
+        });
+      }
+
+      function showExtendConfirm() {
+        if (typeof customPopups === 'undefined' || !customPopups.showConfirm) {
+          return; // 팝업 미로딩 시 카운트다운만으로 만료 처리
+        }
+        var $yes = $('#customConfirmYesButton');
+        var $no = $('#customConfirmNoButton');
+        var prevYes = $yes.text();
+        var prevNo = $no.text();
+        $yes.text('연장하기');
+        $no.text('로그아웃');
+        customPopups.showConfirm('세션이 곧 만료됩니다. 로그인 상태를 연장하시겠습니까?', function (extend) {
+          // 버튼 라벨 원복 (다른 confirm 팝업에 영향 없도록)
+          $yes.text(prevYes);
+          $no.text(prevNo);
+          if (extend) {
+            extendSession();
+          } else {
+            goTo(LOGOUT_URL);
+          }
+        });
+      }
+
+      function tick() {
+        remainingSeconds--;
+        if (remainingSeconds <= 0) {
+          goTo(EXPIRED_URL);
+          return;
+        }
+        if (remainingSeconds <= WARNING_SECONDS && !promptShown) {
+          promptShown = true;
+          showExtendConfirm();
+        }
+        render();
+      }
+
+      function pollStatus() {
+        $.ajax({
+          url: STATUS_URL,
+          type: 'GET',
+          success: function (data) {
+            if (!data || !data.valid) {
+              goTo(FORCE_LOGOUT_URL);
+              return;
+            }
+            remainingSeconds = data.remainingSeconds;
+            if (remainingSeconds > WARNING_SECONDS) {
+              promptShown = false; // 다른 탭/활동으로 연장된 경우 모달 재무장
+            }
+            render();
+          },
+          error: function () {
+            // 폴링 실패 시 로컬 카운트다운 유지
+          }
+        });
+      }
+
+      // 초기화
+      render();
+      countdownTimer = setInterval(tick, 1000);
+      setInterval(pollStatus, POLL_INTERVAL_MS);
+    })();
+  </script>
+
   <script>
     document.addEventListener('DOMContentLoaded', function() {
       // Mobile Drawer