fix: 修复路径遍历安全漏洞并添加文件名校验

- 前端：在 ExtensionsView.vue 上传前添加 beforeUpload 校验，
  仅允许 .zip 或 SKILL.md 文件，其他 .md 文件给出明确错误提示
- 后端：import_skill_dir 添加路径限制检查（is_relative_to），
  确保来源目录在系统临时目录内，防止路径遍历
- 后端：install_remote_skill 改为扫描目录查找安装结果，
  避免直接用用户输入构造文件路径（消除 CodeQL 告警）
- 后端：_run_skills_cli 错误输出清洗 ANSI 控制字符并截断到 500 字符
- 后端：install_remote_skill 返回类型从 object 修正为 Skill

Agent-Logs-Url: https://github.com/xerrors/Yuxi/sessions/0145c647-72bc-41f9-b07b-04d4acf51932

Co-authored-by: xerrors <35524243+xerrors@users.noreply.github.com>

backend/package/yuxi/services/remote_skill_install_service.py

@@ -6,10 +6,14 @@ import re
 import shutil
 import tempfile
 from pathlib import Path
+from typing import TYPE_CHECKING
 
 from sqlalchemy.ext.asyncio import AsyncSession
 from yuxi.services.skill_service import import_skill_dir, is_valid_skill_slug
 
+if TYPE_CHECKING:
+    from yuxi.storage.postgres.models_business import Skill
+
 ANSI_ESCAPE_RE = re.compile(r"\x1B\[[0-?]*[ -/]*[@-~]")
 CONTROL_SEQUENCE_RE = re.compile(r"\x1B\][^\x07]*(?:\x07|\x1B\\)|\x1B[\(\)][A-Za-z0-9]")
 CLI_TIMEOUT_SECONDS = 300
@@ -111,7 +115,9 @@ async def _run_skills_cli(
     error_output = (stderr or b"").decode("utf-8", errors="replace")
     combined = "\n".join(part for part in [output.strip(), error_output.strip()] if part)
     if process.returncode != 0:
-        raise ValueError(combined or "skills CLI 执行失败")
+        cleaned_lines = _clean_cli_output(combined)
+        error_msg = "\n".join(line for line in cleaned_lines if line)[:500]
+        raise ValueError(error_msg or "skills CLI 执行失败")
     return combined
 
 
@@ -149,7 +155,7 @@ async def install_remote_skill(
     source: str,
     skill: str,
     created_by: str | None,
-) -> object:
+) -> Skill:
     normalized_source = _normalize_source(source)
     normalized_skill = _normalize_skill_name(skill)
 
@@ -183,8 +189,17 @@ async def install_remote_skill(
             cwd=workdir,
         )
 
-        installed_dir = Path(temp_home) / ".agents" / "skills" / normalized_skill
+        base_dir = Path(temp_home).resolve()
-        if not installed_dir.exists() or not installed_dir.is_dir():
+        skills_dir = base_dir / ".agents" / "skills"
+        # Scan for the installed skill directory rather than constructing the path
+        # from user input, to avoid path traversal concerns
+        installed_dir = None
+        if skills_dir.is_dir():
+            for candidate in skills_dir.iterdir():
+                if candidate.name == normalized_skill and candidate.is_dir():
+                    installed_dir = candidate
+                    break
+        if installed_dir is None:
             raise ValueError("skills CLI 未生成预期的技能目录")
 
         return await import_skill_dir(

backend/package/yuxi/services/skill_service.py

@@ -594,6 +594,10 @@ async def import_skill_dir(
     created_by: str | None,
 ) -> Skill:
     source_skill_dir = Path(source_dir).resolve()
+    # Confine to the system temp directory to prevent path traversal
+    tmp_root = Path(tempfile.gettempdir()).resolve()
+    if not source_skill_dir.is_relative_to(tmp_root):
+        raise ValueError("技能目录路径不合法")
     if not source_skill_dir.exists() or not source_skill_dir.is_dir():
         raise ValueError("技能目录不存在")
     return await _import_skill_dir_impl(

web/src/views/ExtensionsView.vue

@@ -22,6 +22,7 @@
             accept=".zip,.md"
             :show-upload-list="false"
             :custom-request="handleImportUpload"
+            :before-upload="beforeSkillUpload"
             :disabled="skillsLoading || skillsImporting"
           >
             <a-button type="primary" :loading="skillsImporting" class="lucide-icon-btn">
@@ -98,6 +99,7 @@
 <script setup>
 import { ref, watch } from 'vue'
 import { useRoute } from 'vue-router'
+import { message } from 'ant-design-vue'
 import { Upload, RotateCw, Plus, Computer } from 'lucide-vue-next'
 import SkillsManagerComponent from '@/components/SkillsManagerComponent.vue'
 import ToolsManagerComponent from '@/components/ToolsManagerComponent.vue'
@@ -210,6 +212,16 @@ const handleSubagentRefresh = () => {
   }
 }
 
+// 上传前校验文件名：仅允许 .zip 或 SKILL.md
+const beforeSkillUpload = (file) => {
+  const lower = file.name.toLowerCase()
+  if (!lower.endsWith('.zip') && lower !== 'skill.md') {
+    message.error('仅支持上传 .zip 文件或 SKILL.md 文件')
+    return false
+  }
+  return true
+}
+
 // 处理导入上传
 const handleImportUpload = async ({ file, onSuccess, onError }) => {
   if (skillsRef.value?.handleImportUpload) {