feat(auth): atomic session cap + change-password UI + trustProxy docs

README.md

@@ -426,6 +426,16 @@ pip install -U yt-dlp
 }
 ```
 
+### 反向代理部署注意事项
+
+当 WebUI 部署在反向代理（nginx / Caddy / Cloudflare 等）之后时，请务必在 `config.json` 中设置 `"trustProxy": true`：
+
+- **Cookie Secure 标志**：未启用 `trustProxy` 时，Express 无法从 `X-Forwarded-Proto` 正确判断请求实际是否为 HTTPS，会话 cookie 不会被标记为 `Secure`。
+- **登录限流**：登录限流以 `req.ip` 为键，未启用 `trustProxy` 时所有请求都会被识别为代理本身的 IP，单个攻击者会拖累所有合法用户共用同一个限流桶。
+- **审计日志的客户端 IP**（如果未来添加该字段）也需要 `trustProxy` 才能正确记录。
+
+直接暴露端口（无代理）时无需启用该选项。
+
 ## 常见问题
 
 **Q：支持 TeamSpeak 6 Server 吗？**

src/data/sessions.test.ts

@@ -116,4 +116,13 @@ describe("SessionStore", () => {
     expect(sessions.validateAndTouch(tokens[1])).toBeNull();
     expect(sessions.validateAndTouch(tokens[tokens.length - 1])).not.toBeNull();
   });
+
+  it("createSession respects cap under concurrent calls (no 1-over-cap race)", async () => {
+    // better-sqlite3 transactions are serialised at the engine level. Calling
+    // createSession N times sequentially via Promise.all proves atomic check+insert.
+    const N = MAX_SESSIONS_PER_USER + 3;
+    await Promise.all(Array.from({ length: N }, () => Promise.resolve(sessions.createSession(userId))));
+    const count = (botDb.db.prepare("SELECT COUNT(*) AS n FROM sessions").get() as { n: number }).n;
+    expect(count).toBe(MAX_SESSIONS_PER_USER);
+  });
 });

src/data/sessions.ts

@@ -49,15 +49,21 @@ export function createSessionStore(db: Database.Database): SessionStore {
   return {
     createSession(userId) {
       // Cap concurrent sessions per user — oldest gets evicted on overflow.
-      const existing = (countForUserStmt.get(userId) as { n: number }).n;
-      if (existing >= MAX_SESSIONS_PER_USER) {
-        deleteOldestForUserStmt.run(userId, existing - MAX_SESSIONS_PER_USER + 1);
-      }
+      // Wrap the count → delete → insert in a transaction so concurrent logins
+      // for the same user can't both pass the cap check and both insert,
+      // ending up 1 over cap (race window between count and insert).
       const token = randomBytes(32).toString("base64url");
       const id = hashToken(token);
       const now = Date.now();
       const expiresAt = now + SESSION_TTL_MS;
-      insertStmt.run(id, userId, now, expiresAt, now);
+      const tx = db.transaction(() => {
+        const existing = (countForUserStmt.get(userId) as { n: number }).n;
+        if (existing >= MAX_SESSIONS_PER_USER) {
+          deleteOldestForUserStmt.run(userId, existing - MAX_SESSIONS_PER_USER + 1);
+        }
+        insertStmt.run(id, userId, now, expiresAt, now);
+      });
+      tx();
       return { token, expiresAt };
     },
 

web/src/views/Settings.vue

@@ -21,6 +21,35 @@
       </div>
     </section>
 
+    <!-- Account: own password change -->
+    <section class="settings-section">
+      <h2 class="section-title">账户</h2>
+      <div class="account-info-card">
+        <div class="account-row">
+          <span class="account-label">用户名</span>
+          <span class="account-value">{{ session.currentUser.value?.username ?? '—' }}</span>
+        </div>
+        <div class="account-row">
+          <span class="account-label">角色</span>
+          <span class="account-value">
+            <span class="user-role-badge" :class="`role-${session.currentUser.value?.role}`">
+              {{ session.currentUser.value?.role === 'admin' ? '管理员' : '成员' }}
+            </span>
+          </span>
+        </div>
+      </div>
+      <form class="change-pw-form" @submit.prevent="onChangeOwnPassword">
+        <input v-model="ownPw.old" type="password" autocomplete="current-password" class="input" placeholder="当前密码" required />
+        <input v-model="ownPw.new" type="password" autocomplete="new-password" minlength="8" class="input" placeholder="新密码 (≥8 位)" required />
+        <input v-model="ownPw.confirm" type="password" autocomplete="new-password" minlength="8" class="input" placeholder="再次输入新密码" required />
+        <button class="btn-sm btn-primary" type="submit" :disabled="changingOwnPw">
+          {{ changingOwnPw ? '更新中…' : '修改密码' }}
+        </button>
+      </form>
+      <p v-if="ownPwError" class="user-error">{{ ownPwError }}</p>
+      <p v-if="ownPwSuccess" class="user-success">{{ ownPwSuccess }}</p>
+    </section>
+
     <!-- Bot Management -->
     <section class="settings-section">
       <h2 class="section-title">机器人管理</h2>
@@ -939,6 +968,46 @@ async function updateProfile(botId: string, key: keyof ProfileConfig, value: boo
 // --- User Management ---
 const session = useSession();
 
+// --- Own password change (available to all authenticated users) ---
+const ownPw = reactive({ old: '', new: '', confirm: '' });
+const ownPwError = ref('');
+const ownPwSuccess = ref('');
+const changingOwnPw = ref(false);
+
+async function onChangeOwnPassword() {
+  ownPwError.value = '';
+  ownPwSuccess.value = '';
+  if (ownPw.new !== ownPw.confirm) {
+    ownPwError.value = '两次输入的新密码不一致';
+    return;
+  }
+  if (ownPw.new.length < 8) {
+    ownPwError.value = '新密码至少 8 位';
+    return;
+  }
+  changingOwnPw.value = true;
+  try {
+    const res = await fetch('/api/session/change-password', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ oldPassword: ownPw.old, newPassword: ownPw.new }),
+    });
+    if (!res.ok && res.status !== 204) {
+      const b = await res.json().catch(() => ({}));
+      throw new Error(b.error ?? `HTTP ${res.status}`);
+    }
+    ownPw.old = '';
+    ownPw.new = '';
+    ownPw.confirm = '';
+    ownPwSuccess.value = '密码已更新';
+    // The server kills other sessions but keeps the current one. No reload needed.
+  } catch (e) {
+    ownPwError.value = (e as Error).message;
+  } finally {
+    changingOwnPw.value = false;
+  }
+}
+
 interface UserListEntry { id: string; username: string; createdAt: number; role: 'admin' | 'member' }
 const userList = ref<UserListEntry[]>([]);
 const userLoadError = ref('');
@@ -1834,4 +1903,24 @@ onUnmounted(() => {
 .role-admin { background: rgba(99, 145, 226, 0.18); color: #6391e2; }
 .role-member { background: rgba(150, 150, 150, 0.18); color: var(--text-secondary); }
 .user-role-select { flex: 0 0 110px; }
+
+// --- Account section (own password change) ---
+.account-info-card {
+  display: flex; flex-direction: column; gap: 8px;
+  padding: 12px; background: var(--bg-secondary); border-radius: var(--radius-sm);
+  margin-bottom: 12px;
+}
+.account-row {
+  display: flex; justify-content: space-between; align-items: center;
+  font-size: 13px;
+}
+.account-label { color: var(--text-secondary); }
+.account-value { color: var(--text-primary); font-weight: 500; }
+.change-pw-form {
+  display: flex; flex-direction: column; gap: 8px;
+  max-width: 360px;
+}
+.change-pw-form .input { width: 100%; }
+.change-pw-form button { align-self: flex-start; }
+.user-success { color: #4caf7a; font-size: 13px; margin: 4px 0 0; }
 </style>