mcp-server-semgrep/semgrep-rules/swift/webview/webview-js-window.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: swift-webview-config-allows-js-open-windows
  message: >-
    Webviews were observed that explictly allow JavaScript in an WKWebview to open windows automatically.
    Consider disabling this functionality if not required, following the principle of least privelege.
  severity: WARNING
  metadata:
    likelihood: LOW
    impact: LOW
    confidence: HIGH
    category: security
    cwe:
    - 'CWE-272: Least Privilege Violation'
    masvs:
    - 'MASVS-PLATFORM-2: The app uses WebViews securely'
    references:
    - https://mas.owasp.org/MASVS/controls/MASVS-PLATFORM-2/
    - https://developer.apple.com/documentation/webkit/wkpreferences/1536573-javascriptcanopenwindowsautomati
    subcategory:
    - audit
    technology:
    - ios
    - macos
  languages:
  - swift
  patterns:
  - pattern: |
      $P = WKPreferences()
      ...
  - pattern-either:
    - patterns:
      - pattern-inside: |
          $P.JavaScriptCanOpenWindowsAutomatically  = $FALSE
          ...
          $P.JavaScriptCanOpenWindowsAutomatically  = $TRUE
      # nosemgrep
      - pattern-not-inside: |
          ...
          $P.JavaScriptCanOpenWindowsAutomatically  = $TRUE
          ...
          $P.JavaScriptCanOpenWindowsAutomatically = $FALSE
      - pattern: |
          $P.JavaScriptCanOpenWindowsAutomatically  = true
      - metavariable-regex:
          metavariable: $TRUE
          regex: ^(true)$
      - metavariable-regex:
          metavariable: $TRUE
          regex: (.*(?!true))
    - patterns:
      - pattern: |
          $P.JavaScriptCanOpenWindowsAutomatically  = true
      # nosemgrep
      - pattern-not-inside: |
          ...
          $P.JavaScriptCanOpenWindowsAutomatically  = ...
          ...
          $P.JavaScriptCanOpenWindowsAutomatically  = ...