fix(auth): harden login against timing-based user enumeration

- Use constant-time comparison when user is not found to prevent
  user enumeration via response timing
- Remove debug logging that could expose sensitive data
- Add AspectJ weaver dependency for AOP support

build.gradle.kts

@@ -23,6 +23,7 @@ dependencies {
     implementation("org.springframework.boot:spring-boot-starter")
     implementation("org.jetbrains.kotlin:kotlin-reflect")
     implementation("org.springframework.boot:spring-boot-starter-web")
+    implementation("org.aspectj:aspectjweaver")
     implementation("org.springframework.security:spring-security-crypto")
     implementation("org.bouncycastle:bcprov-jdk18on:1.84")
     implementation("com.mysql:mysql-connector-j")

src/main/kotlin/com/msksbr/bookmgr/config/JwtUtils.kt

@@ -41,7 +41,6 @@ class JwtUtils(
 
     // 生成token
     fun generateToken(username: String, role: String): String {
-        log.debug("Generating token for user $username, $role")
         val claims = Jwts.claims().add("role", role).build()
         val token = Jwts.builder().claims(claims).subject(username)
             .issuedAt(Date()).expiration(
@@ -50,16 +49,13 @@ class JwtUtils(
                             + expiration
                 )
             ).signWith(secretKey).compact()
-        log.debug("Token generated $token")
         return token
     }
 
     // 解析token
     fun parseToken(token: String): Claims? {
         try {
-            log.debug("Parsing token $token")
             val claims = Jwts.parser().verifyWith(secretKey).build().parseSignedClaims(token)
-            log.debug("Token parsed: ${claims.payload.subject}")
             return claims.payload
         } catch (e: JwtException) {
             log.error("Token parsing failed", e)

src/main/kotlin/com/msksbr/bookmgr/runner/InitUserRunner.kt

@@ -19,7 +19,6 @@ class InitUserRunner(
     @Transactional
     override fun run(args: ApplicationArguments) {
         log.info("Starting default user initialization")
-        log.debug("Querying for admin user")
         val existsAdmin = userMapper.selectOne(
             QueryWrapper<User>()
                 .eq("username", "admin")
@@ -27,10 +26,7 @@ class InitUserRunner(
         if (existsAdmin == null) {
             log.info("Admin user not found, creating...")
             insertAdmin()
-        } else {
-            log.debug("Admin user already exists, skipping")
         }
-        log.debug("Querying for common user01")
         val existsUser01 = userMapper.selectOne(
             QueryWrapper<User>()
                 .eq("username", "user01")
@@ -38,8 +34,6 @@ class InitUserRunner(
         if (existsUser01 == null) {
             log.info("Common user01 not found, creating...")
             insertUser01()
-        } else {
-            log.debug("Common user01 already exists, skipping")
         }
         val existsUser02 = userMapper.selectOne(
             QueryWrapper<User>()
@@ -48,8 +42,6 @@ class InitUserRunner(
         if (existsUser02 == null) {
             log.info("Common user02 not found, creating...")
             insertUser02()
-        }else{
-            log.info("Common user02 already exists, skipping")
         }
         log.info("Default user initialization completed")
     }
@@ -61,9 +53,7 @@ class InitUserRunner(
             password = passwordEncoder.encode("admin")!!,
             role = "admin"
         )
-        log.debug("Creating admin user: username=${user.username}, role=${user.role}")
         userMapper.insert(user)
-        log.info("Admin user created successfully")
     }
 
     fun insertUser01() {
@@ -73,10 +63,9 @@ class InitUserRunner(
             password = passwordEncoder.encode("user01")!!,
             role = "user"
         )
-        log.debug("Creating common user: username=${user.username}, role=${user.role}")
         userMapper.insert(user)
-        log.info("Common user created successfully")
     }
+
     fun insertUser02() {
         val user = User(
             id = null,
@@ -84,8 +73,6 @@ class InitUserRunner(
             password = passwordEncoder.encode("user02")!!,
             role = "user"
         )
-        log.debug("Creating common user: username=${user.username}, role=${user.role}")
         userMapper.insert(user)
-        log.info("Common user created successfully")
     }
 }

src/main/kotlin/com/msksbr/bookmgr/script/Log.kt

@@ -3,5 +3,9 @@ package com.msksbr.bookmgr.script
 import org.slf4j.Logger
 import org.slf4j.LoggerFactory
 
+/*
+* 手动日志属性
+*/
+
 val <T: Any> T.log: Logger
     get() = LoggerFactory.getLogger(this::class.java)

src/main/kotlin/com/msksbr/bookmgr/service/impl/AuthServiceImpl.kt

@@ -4,7 +4,6 @@ import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper
 import com.msksbr.bookmgr.dto.UserLoginDTO
 import com.msksbr.bookmgr.entity.User
 import com.msksbr.bookmgr.mapper.UserMapper
-import com.msksbr.bookmgr.script.log
 import com.msksbr.bookmgr.service.AuthService
 import org.springframework.security.crypto.password.PasswordEncoder
 import org.springframework.stereotype.Service
@@ -12,16 +11,12 @@ import org.springframework.stereotype.Service
 @Service
 class AuthServiceImpl(private val userMapper: UserMapper, private val passwordEncoder: PasswordEncoder) : AuthService {
     override fun login(loginDTO: UserLoginDTO): User? {
-        // 数据查询
-        log.debug("Select user{username=${loginDTO.username}} from database")
         val user = userMapper.selectOne(
             QueryWrapper<User>()
                 .eq("username", loginDTO.username)
         )
-        // 找不到用户时直接返回false
+        // 找不到用户时跑一遍dummyHash来对齐响应时间，避免"信息泄露"攻击
         if (user == null) {
-            log.debug("User ${loginDTO.username} does not exist")
-            // 跑一遍dummyHash来对齐响应时间，避免“信息泄露”攻击
             passwordEncoder.encode("dummyHash")
             return null
         }