js-api-extract

DevOps & Security

JavaScript 静态分析提取隐藏 API 端点。当目标是 SPA/前后端分离架构、页面使用 Vue/React/Angular、或常规目录扫描收效甚微时使用。通过分析 JS bundle 提取 API 路径、密钥、内部域名、WebSocket 端点。是 API 渗透的信息收集阶段。发现端点后 → api-fuzz 进行语义化 fuzz

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JavaScript API 端点提取方法论

前后端分离架构中，JS bundle 是 API 端点的最大信息源——比目录扫描高效 10 倍。

⛔ 深入参考（必读）

JS 分析正则库 + 提取脚本 → references/js-extract-patterns.md

Phase 1: JS 文件收集

1.1 从页面 HTML 收集

# 抓取页面中所有 JS 引用
curl -s "$TARGET" | grep -oE '(src|href)="[^"]*\.js[^"]*"' | sed 's/.*="\(.*\)"/\1/'

# 递归抓取（含 iframe/动态加载）
curl -s "$TARGET" | grep -oP '(?:src|href|url)\s*[=:]\s*["\x27]([^"\x27]*\.js[^"\x27]*)["\x27]' | sort -u

1.2 从 Source Map 恢复

# 检查 JS 文件末尾的 sourceMappingURL
curl -s "$TARGET/static/js/app.xxx.js" | tail -1
# 如果有 //# sourceMappingURL=app.xxx.js.map
curl -s "$TARGET/static/js/app.xxx.js.map" -o sourcemap.json

# Source Map 暴露完整源码——等于拿到了前端源码

1.3 从 Webpack 清单收集

# 常见 chunk 清单文件
/static/js/manifest.json
/asset-manifest.json
/webpack-manifest.json
/build/asset-manifest.json
/static/js/runtime~main.xxx.js  # runtime chunk 包含所有 chunk 映射

1.4 历史版本

# Wayback Machine 获取旧版 JS（可能包含已删除但未下线的 API）
curl -s "https://web.archive.org/cdx/search/cdx?url=$DOMAIN/*.js&output=text&fl=original" | sort -u

Phase 2: API 端点提取

2.1 路径模式提取

# 从 JS 内容中提取 API 路径（最核心的一步）
curl -s "$JS_URL" | grep -oP '["'"'"'](/(?:api|v[0-9]|rest|service|graphql|ws|internal|admin|auth|user|public)[^\s"'"'"']*?)["'"'"']' | sort -u

# 拼接路径提取（前端常见写法：baseURL + path）
curl -s "$JS_URL" | grep -oP '(?:baseURL|BASE_URL|API_URL|apiPrefix|apiBase)\s*[=:]\s*["'"'"']([^"'"'"']+)["'"'"']'

# 通用路径提取（含相对路径）
curl -s "$JS_URL" | grep -oP '["'"'"'](/[a-zA-Z][a-zA-Z0-9_/\-]{2,}(?:\?[^"'"'"']*)?)["'"'"']' | sort -u | grep -v '\.\(js\|css\|png\|jpg\|svg\|ico\|woff\|ttf\)'

2.2 完整 URL 提取

# 提取完整的 HTTP(S) URL
curl -s "$JS_URL" | grep -oP 'https?://[^\s"'"'"'<>]+' | sort -u

# 提取内部域名/子域名
curl -s "$JS_URL" | grep -oP 'https?://[a-zA-Z0-9._-]+\.DOMAIN\.com[^\s"'"'"']*' | sort -u

2.3 关键信息提取

# API Key / Secret / Token
curl -s "$JS_URL" | grep -oiP '(?:api[_-]?key|secret|token|auth|password|credential)\s*[=:]\s*["'"'"']([^"'"'"']{8,})["'"'"']'

# WebSocket 端点
curl -s "$JS_URL" | grep -oP 'wss?://[^\s"'"'"']+' | sort -u

# 内部 IP/域名
curl -s "$JS_URL" | grep -oP '(?:10|172\.(?:1[6-9]|2\d|3[01])|192\.168)\.\d+\.\d+' | sort -u

Phase 3: 端点分类与优先级

提取完后按安全价值分类：

优先级	特征	说明
🔴 高	`/admin/`, `/internal/`, `/debug/`, `/manage/`	管理功能，可能缺乏认证
🔴 高	`/upload`, `/import`, `/export`, `/download`	文件操作，可能有路径穿越/任意读写
🔴 高	`/user/`, `/account/`, `/profile/`, `/order/`	用户数据操作，IDOR 高发区
🟡 中	`/auth/`, `/login/`, `/register/`, `/reset/`	认证流程，可能有逻辑绕过
🟡 中	`/search`, `/query`, `/filter`	查询接口，SQL 注入高发区
🟢 低	`/static/`, `/public/`, `/health`, `/status`	静态资源/健康检查

Phase 4: 批量验证

# 对提取的端点逐一验证存活
for path in $(cat extracted_paths.txt); do
    code=$(curl -s -o /dev/null -w "%{http_code}" "$TARGET$path" --connect-timeout 5 -m 10)
    echo "$code $path"
done | grep -v "^404 " | sort

关键看点：

200 → 直接可访问，检查响应内容
401/403 → 存在但需认证，尝试绕过
405 → 端点存在但方法不对，尝试 POST/PUT/DELETE
500 → 后端报错，可能有注入点
301/302 → 跟踪重定向目标

输出要求

提取结束后输出：

JS 文件清单 — 分析了哪些 JS
发现的 API 端点列表 — 按优先级排序
暴露的敏感信息 — API Key、内部域名、Token
推荐的下一步测试 — 哪些端点应该优先 fuzz