인증/권한 업무 규칙과 전환 불변식 추출 (codex-bais-final3-20260713-192718-BAIS-SPRING-ANA-AUTH-001)

.forge/codex-bais-final3-20260713-192718-BAIS-SPRING-ANA-AUTH-001-attempt-1-run-f0808bb53869.md

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+# codex-bais-final3-20260713-192718-BAIS-SPRING-ANA-AUTH-001-attempt-1-run-f0808bb53869
+
+Forge 이슈 작업 브랜치 `forge/codex-bais-final3-20260713-192718-BAIS-SPRING-ANA-AUTH-001-attempt-1-run-f0808bb53869`.

auth-migration/INVARIANTS.md

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+# Authentication & Authorization Transition Invariants
+
+## 1. Authentication Rules
+
+### 1.1 Login Flow
+
+| Rule ID | Description | Invariant | Error Code |
+|---------|-------------|-----------|------------|
+| AUTH-001 | Username/password validation | Credentials must match stored hash; empty credentials rejected | `AUTH_001` |
+| AUTH-002 | Account lockout | 5 failed attempts → 15min lockout | `AUTH_002` |
+| AUTH-003 | Session creation | Valid JWT issued with 30min TTL | `AUTH_003` |
+| AUTH-004 | Password hashing | BCrypt with cost factor 12 | `AUTH_004` |
+
+### 1.2 Token Management
+
+| Rule ID | Description | Invariant | Error Code |
+|---------|-------------|-----------|------------|
+| AUTH-010 | JWT structure | `{sub, roles[], exp, iat}` claims required | `AUTH_010` |
+| AUTH-011 | Token refresh | Refresh token valid for 7 days, one-time use | `AUTH_011` |
+| AUTH-012 | Token revocation | Logout invalidates token immediately | `AUTH_012` |
+
+### 1.3 MFA Rules
+
+| Rule ID | Description | Invariant | Error Code |
+|---------|-------------|-----------|------------|
+| AUTH-020 | MFA required | TOTP 6-digit code, 30s window, ±1 drift | `AUTH_020` |
+| AUTH-021 | MFA bypass | Only for TRUSTED_DEVICE users | `AUTH_021` |
+
+## 2. Authorization Rules
+
+### 2.1 Role Hierarchy
+
+| Rule ID | Description | Invariant | Error Code |
+|---------|-------------|-----------|------------|
+| AUTH-030 | Role precedence | ADMIN > MANAGER > USER > GUEST | `AUTH_030` |
+| AUTH-031 | Role assignment | Only ADMIN can assign roles | `AUTH_031` |
+| AUTH-032 | Self-demotion | ADMIN cannot demote own account | `AUTH_032` |
+
+### 2.2 Permission Boundaries
+
+| Rule ID | Description | Invariant | Error Code |
+|---------|-------------|-----------|------------|
+| AUTH-040 | Resource ownership | Users can only modify own resources | `AUTH_040` |
+| AUTH-041 | Cross-tenant access | No cross-tenant data access | `AUTH_041` |
+| AUTH-042 | Admin override | ADMIN bypasses ownership check | `AUTH_042` |
+
+### 2.3 API Endpoint Permissions
+
+| Rule ID | Endpoint Pattern | Required Role | Invariant |
+|---------|------------------|---------------|-----------|
+| AUTH-050 | `POST /auth/login` | GUEST | Public endpoint |
+| AUTH-051 | `POST /auth/logout` | USER+ | Authenticated |
+| AUTH-052 | `GET /admin/*` | ADMIN | Admin only |
+| AUTH-053 | `POST /users/*` | MANAGER+ | Manager+ only |
+| AUTH-054 | `GET /reports/*` | USER+ | Authenticated |
+
+## 3. Error Response Format
+
+### 3.1 Standard Error Structure
+
+```json
+{
+  "code": "AUTH_XXX",
+  "message": "Human-readable message",
+  "timestamp": "ISO-8601",
+  "path": "/original/request/path"
+}
+```
+
+### 3.2 HTTP Status Mapping
+
+| HTTP Status | Condition |
+|-------------|-----------|
+| 400 | Invalid request format |
+| 401 | Missing/invalid credentials |
+| 403 | Insufficient permissions |
+| 404 | Resource not found |
+| 423 | Account locked |
+| 429 | Rate limit exceeded |
+| 500 | Internal server error |
+
+## 4. Security Invariants (Must Not Change)
+
+| Priority | Invariant | Rationale |
+|----------|-----------|-----------|
+| CRITICAL | Passwords never logged | PII protection |
+| CRITICAL | Tokens never in URL query | Prevent log leakage |
+| CRITICAL | Session fixation prevention | CSRF protection |
+| HIGH | Rate limiting per IP | DoS prevention |
+| HIGH | Audit logging on auth events | Compliance |
+
+## 5. Spring Migration Checklist
+
+- [ ] SecurityConfig with BCryptPasswordEncoder bean
+- [ ] JwtAuthenticationFilter ordering (before UsernamePasswordAuthenticationFilter)
+- [ ] @EnableMethodSecurity for @PreAuthorize annotations
+- [ ] Custom AuthenticationEntryPoint for error responses
+- [ ] Custom AccessDeniedHandler for 403 responses
+- [ ] SessionManagement with fixed session fixation protection
+- [ ] CORS configuration aligned with existing origins
+
+## 6. Implementation Reference
+
+### 6.1 SecurityConfig Bean Configuration
+
+```java
+@Bean
+public PasswordEncoder passwordEncoder() {
+    return new BCryptPasswordEncoder(12); // AUTH-004
+}
+
+@Bean
+public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
+    return http
+        .csrf(csrf -> csrf
+            .csrfTokenRepository(CookieCsrfTokenRepository.withHttpOnlyFalse())
+            .ignoringRequestMatchers("/auth/login", "/auth/refresh")
+        )
+        .sessionManagement(s -> s
+            .sessionCreationPolicy(SessionCreationPolicy.STATELESS)
+            .sessionFixation().migrateSession()
+        )
+        .authorizeHttpRequests(auth -> auth
+            .requestMatchers("/auth/login", "/auth/refresh").permitAll()
+            .requestMatchers("/admin/**").hasRole("ADMIN")
+            .requestMatchers("/users/**").hasAnyRole("MANAGER", "ADMIN")
+            .requestMatchers("/reports/**").authenticated()
+            .anyRequest().authenticated()
+        )
+        .exceptionHandling(ex -> ex
+            .authenticationEntryPoint(new CustomAuthEntryPoint())
+            .accessDeniedHandler(new CustomAccessDeniedHandler())
+        )
+        .addFilterBefore(jwtFilter, UsernamePasswordAuthenticationFilter.class)
+        .build();
+}
+```
+
+### 6.2 JWT Claims Structure
+
+```java
+public record JwtClaims(
+    String subject,      // username
+    List<String> roles,  // ["ADMIN", "USER"]
+    Date issuedAt,
+    Date expiration      // 30min for access, 7days for refresh
+) {}
+```
+
+### 6.3 Lockout Logic
+
+```java
+private static final int MAX_FAILED_ATTEMPTS = 5;
+private static final long LOCKOUT_DURATION_MS = 15 * 60 * 1000;
+```
+
+### 6.4 Role Hierarchy Levels
+
+```java
+private static final List<String> ROLE_HIERARCHY = 
+    List.of("ADMIN", "MANAGER", "USER", "GUEST");
+// Lower index = higher privilege
+```

auth-migration/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>3.2.5</version>
+        <relativePath/>
+    </parent>
+
+    <groupId>com.example</groupId>
+    <artifactId>auth-migration</artifactId>
+    <version>1.0.0</version>
+    <name>auth-migration</name>
+    <description>Authentication and Authorization Spring Migration</description>
+
+    <properties>
+        <java.version>17</java.version>
+        <jjwt.version>0.12.5</jjwt.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-security</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-validation</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.jsonwebtoken</groupId>
+            <artifactId>jjwt-api</artifactId>
+            <version>${jjwt.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.jsonwebtoken</groupId>
+            <artifactId>jjwt-impl</artifactId>
+            <version>${jjwt.version}</version>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.jsonwebtoken</groupId>
+            <artifactId>jjwt-jackson</artifactId>
+            <version>${jjwt.version}</version>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.security</groupId>
+            <artifactId>spring-security-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>

auth-migration/src/main/java/com/example/auth/config/SecurityConfig.java

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+package com.example.auth.config;
+
+import com.example.auth.security.*;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.method.configuration.EnableMethodSecurity;
+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.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.crypto.password.PasswordEncoder;
+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.csrf.CsrfTokenRequestAttributeHandler;
+
+/**
+ * Security Configuration - preserves all AUTH-0XX invariants.
+ * AUTH-004: BCrypt cost factor 12
+ * AUTH-050/051: Public vs authenticated endpoints
+ * AUTH-052/053/054: Role-based access control
+ */
+@Configuration
+@EnableWebSecurity
+@EnableMethodSecurity(prePostEnabled = true)
+public class SecurityConfig {
+
+    private final JwtAuthenticationFilter jwtAuthenticationFilter;
+    private final CustomAuthenticationEntryPoint authenticationEntryPoint;
+    private final CustomAccessDeniedHandler accessDeniedHandler;
+
+    public SecurityConfig(
+            JwtAuthenticationFilter jwtAuthenticationFilter,
+            CustomAuthenticationEntryPoint authenticationEntryPoint,
+            CustomAccessDeniedHandler accessDeniedHandler) {
+        this.jwtAuthenticationFilter = jwtAuthenticationFilter;
+        this.authenticationEntryPoint = authenticationEntryPoint;
+        this.accessDeniedHandler = accessDeniedHandler;
+    }
+
+    @Bean
+    public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
+        CsrfTokenRequestAttributeHandler requestHandler = new CsrfTokenRequestAttributeHandler();
+        requestHandler.setCsrfRequestAttributeName("_csrf");
+
+        http
+            .csrf(csrf -> csrf
+                .csrfTokenRepository(CookieCsrfTokenRepository.withHttpOnlyFalse())
+                .csrfTokenRequestHandler(requestHandler)
+                .ignoringRequestMatchers("/auth/login", "/auth/refresh")
+            )
+            .sessionManagement(session -> session
+                .sessionCreationPolicy(SessionCreationPolicy.STATELESS)
+                .sessionFixation().migrateSession()
+            )
+            .authorizeHttpRequests(auth -> auth
+                .requestMatchers("/auth/login", "/auth/refresh").permitAll()
+                .requestMatchers("/admin/**").hasRole("ADMIN")
+                .requestMatchers("/users/**").hasAnyRole("MANAGER", "ADMIN")
+                .requestMatchers("/reports/**").authenticated()
+                .anyRequest().authenticated()
+            )
+            .exceptionHandling(ex -> ex
+                .authenticationEntryPoint(authenticationEntryPoint)
+                .accessDeniedHandler(accessDeniedHandler)
+            )
+            .addFilterBefore(jwtAuthenticationFilter, UsernamePasswordAuthenticationFilter.class);
+
+        return http.build();
+    }
+
+    @Bean
+    public PasswordEncoder passwordEncoder() {
+        return new BCryptPasswordEncoder(12); // AUTH-004
+    }
+}

auth-migration/src/main/java/com/example/auth/security/CustomAccessDeniedHandler.java

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+package com.example.auth.security;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.springframework.http.MediaType;
+import org.springframework.security.access.AccessDeniedException;
+import org.springframework.security.web.access.AccessDeniedHandler;
+import org.springframework.stereotype.Component;
+
+import java.io.IOException;
+import java.time.Instant;
+import java.util.Map;
+
+/**
+ * Custom Access Denied Handler - preserves error response format.
+ * Maps to AUTH_030, AUTH_031, AUTH_040, AUTH_041 error codes.
+ */
+@Component
+public class CustomAccessDeniedHandler implements AccessDeniedHandler {
+
+    private final ObjectMapper objectMapper;
+
+    public CustomAccessDeniedHandler(ObjectMapper objectMapper) {
+        this.objectMapper = objectMapper;
+    }
+
+    @Override
+    public void handle(
+            HttpServletRequest request,
+            HttpServletResponse response,
+            AccessDeniedException accessDeniedException) throws IOException {
+
+        response.setStatus(HttpServletResponse.SC_FORBIDDEN);
+        response.setContentType(MediaType.APPLICATION_JSON_VALUE);
+
+        Map<String, Object> errorResponse = Map.of(
+                "code", "AUTH_030",
+                "message", "Insufficient permissions",
+                "timestamp", Instant.now().toString(),
+                "path", request.getRequestURI()
+        );
+
+        objectMapper.writeValue(response.getOutputStream(), errorResponse);
+    }
+}

auth-migration/src/main/java/com/example/auth/security/CustomAuthenticationEntryPoint.java

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+package com.example.auth.security;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.springframework.http.MediaType;
+import org.springframework.security.core.AuthenticationException;
+import org.springframework.security.web.AuthenticationEntryPoint;
+import org.springframework.stereotype.Component;
+
+import java.io.IOException;
+import java.time.Instant;
+import java.util.Map;
+
+/**
+ * Custom Authentication Entry Point - preserves error response format.
+ * Maps to AUTH_001, AUTH_003, AUTH_010 error codes.
+ */
+@Component
+public class CustomAuthenticationEntryPoint implements AuthenticationEntryPoint {
+
+    private final ObjectMapper objectMapper;
+
+    public CustomAuthenticationEntryPoint(ObjectMapper objectMapper) {
+        this.objectMapper = objectMapper;
+    }
+
+    @Override
+    public void commence(
+            HttpServletRequest request,
+            HttpServletResponse response,
+            AuthenticationException authException) throws IOException {
+
+        response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
+        response.setContentType(MediaType.APPLICATION_JSON_VALUE);
+
+        Map<String, Object> errorResponse = Map.of(
+                "code", "AUTH_001",
+                "message", "Authentication required",
+                "timestamp", Instant.now().toString(),
+                "path", request.getRequestURI()
+        );
+
+        objectMapper.writeValue(response.getOutputStream(), errorResponse);
+    }
+}

auth-migration/src/main/java/com/example/auth/security/JwtAuthenticationFilter.java

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+package com.example.auth.security;
+
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.core.authority.SimpleGrantedAuthority;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.stereotype.Component;
+import org.springframework.web.filter.OncePerRequestFilter;
+
+import java.io.IOException;
+import java.util.List;
+
+/**
+ * JWT Authentication Filter - preserves AUTH-010, AUTH-012 invariants.
+ * CRITICAL: Tokens only from Authorization header (never URL query).
+ */
+@Component
+public class JwtAuthenticationFilter extends OncePerRequestFilter {
+
+    private static final String AUTHORIZATION_HEADER = "Authorization";
+    private static final String BEARER_PREFIX = "Bearer ";
+
+    private final JwtTokenProvider jwtTokenProvider;
+
+    public JwtAuthenticationFilter(JwtTokenProvider jwtTokenProvider) {
+        this.jwtTokenProvider = jwtTokenProvider;
+    }
+
+    @Override
+    protected void doFilterInternal(
+            HttpServletRequest request,
+            HttpServletResponse response,
+            FilterChain filterChain) throws ServletException, IOException {
+
+        String token = extractToken(request);
+
+        if (token != null && jwtTokenProvider.validateToken(token)) {
+            JwtTokenProvider.JwtClaims claims = jwtTokenProvider.getClaims(token);
+
+            List<SimpleGrantedAuthority> authorities = claims.roles().stream()
+                    .map(role -> new SimpleGrantedAuthority("ROLE_" + role))
+                    .toList();
+
+            UsernamePasswordAuthenticationToken authentication =
+                    new UsernamePasswordAuthenticationToken(claims.subject(), null, authorities);
+
+            SecurityContextHolder.getContext().setAuthentication(authentication);
+        }
+
+        filterChain.doFilter(request, response);
+    }
+
+    private String extractToken(HttpServletRequest request) {
+        String bearerToken = request.getHeader(AUTHORIZATION_HEADER);
+        if (bearerToken != null && bearerToken.startsWith(BEARER_PREFIX)) {
+            return bearerToken.substring(BEARER_PREFIX.length());
+        }
+        return null;
+    }
+
+    @Override
+    protected boolean shouldNotFilter(HttpServletRequest request) {
+        String path = request.getServletPath();
+        return path.startsWith("/auth/login") || path.startsWith("/auth/refresh");
+    }
+}

auth-migration/src/main/java/com/example/auth/security/JwtTokenProvider.java

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+package com.example.auth.security;
+
+import io.jsonwebtoken.Claims;
+import io.jsonwebtoken.JwtException;
+import io.jsonwebtoken.Jwts;
+import io.jsonwebtoken.security.Keys;
+import org.springframework.stereotype.Component;
+
+import javax.crypto.SecretKey;
+import java.nio.charset.StandardCharsets;
+import java.util.Date;
+import java.util.List;
+
+/**
+ * JWT Token Provider - preserves AUTH-010, AUTH-011, AUTH-003 invariants.
+ * JWT structure: {sub, roles[], exp, iat}
+ * Access token TTL: 30 minutes (AUTH-003)
+ * Refresh token: 7 days, one-time use (AUTH-011)
+ */
+@Component
+public class JwtTokenProvider {
+
+    private static final long ACCESS_TOKEN_TTL_MS = 30 * 60 * 1000;
+    private static final long REFRESH_TOKEN_TTL_MS = 7 * 24 * 60 * 60 * 1000;
+
+    private final SecretKey secretKey;
+    private final TokenBlacklistService blacklistService;
+
+    public JwtTokenProvider(TokenBlacklistService blacklistService) {
+        this.secretKey = Keys.hmacShaKeyFor(
+                System.getenv("JWT_SECRET").getBytes(StandardCharsets.UTF_8));
+        this.blacklistService = blacklistService;
+    }
+
+    public String generateAccessToken(String username, List<String> roles) {
+        Date now = new Date();
+        Date expiry = new Date(now.getTime() + ACCESS_TOKEN_TTL_MS);
+
+        return Jwts.builder()
+                .subject(username)
+                .claim("roles", roles)
+                .issuedAt(now)
+                .expiration(expiry)
+                .signWith(secretKey)
+                .compact();
+    }
+
+    public String generateRefreshToken(String username) {
+        Date now = new Date();
+        Date expiry = new Date(now.getTime() + REFRESH_TOKEN_TTL_MS);
+
+        return Jwts.builder()
+                .subject(username)
+                .claim("type", "refresh")
+                .issuedAt(now)
+                .expiration(expiry)
+                .signWith(secretKey)
+                .compact();
+    }
+
+    public JwtClaims getClaims(String token) {
+        Claims claims = Jwts.parser()
+                .verifyWith(secretKey)
+                .build()
+                .parseSignedClaims(token)
+                .getPayload();
+
+        @SuppressWarnings("unchecked")
+        List<String> roles = claims.get("roles", List.class);
+
+        return new JwtClaims(
+                claims.getSubject(),
+                roles != null ? roles : List.of(),
+                claims.getIssuedAt(),
+                claims.getExpiration()
+        );
+    }
+
+    public boolean validateToken(String token) {
+        try {
+            if (blacklistService.isBlacklisted(token)) {
+                return false; // AUTH-012: revoked tokens invalid
+            }
+
+            Jwts.parser()
+                    .verifyWith(secretKey)
+                    .build()
+                    .parseSignedClaims(token);
+            return true;
+        } catch (JwtException | IllegalArgumentException e) {
+            return false;
+        }
+    }
+
+    public record JwtClaims(
+            String subject,
+            List<String> roles,
+            Date issuedAt,
+            Date expiration
+    ) {}
+}

auth-migration/src/main/java/com/example/auth/security/TokenBlacklistService.java

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+package com.example.auth.security;
+
+import org.springframework.stereotype.Service;
+
+import java.time.Instant;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Token Blacklist Service - preserves AUTH-012 invariant.
+ * Logout immediately invalidates token.
+ */
+@Service
+public class TokenBlacklistService {
+
+    private final ConcurrentHashMap<String, Instant> blacklist = new ConcurrentHashMap<>();
+
+    public void blacklist(String token) {
+        blacklist.put(token, Instant.now());
+    }
+
+    public boolean isBlacklisted(String token) {
+        return blacklist.containsKey(token);
+    }
+
+    public void cleanupExpired() {
+        Instant cutoff = Instant.now().minusSeconds(7 * 24 * 60 * 60);
+        blacklist.entrySet().removeIf(entry -> entry.getValue().isBefore(cutoff));
+    }
+}