# Chrome Extension Security Rules
# Category: chrome-extension
# Evaluates Chromium browser extensions for risky permissions and execution posture

- id: CHE-001
  name: "Extension with broad host access"
  description: "Browser extensions with <all_urls> or wildcard host permissions can access and manipulate content on most websites"
  severity: high
  category: chrome-extension
  dry-run-support: full
  condition: |
    components[
      $startsWith(purl, 'pkg:chrome-extension/')
      and (
        $listContains($propList($, 'cdx:chrome-extension:permissions'), '<all_urls>')
        or $listContains($propList($, 'cdx:chrome-extension:hostPermissions'), '<all_urls>')
        or $listContains($propList($, 'cdx:chrome-extension:hostPermissions'), '*://*/*')
      )
    ]
  location: |
    {
      "bomRef": $. "bom-ref",
      "purl": purl,
      "srcFile": $prop($, 'SrcFile')
    }
  message: "Chrome extension '{{ name }}@{{ version }}' has broad host access permissions"
  mitigation: "Limit host permissions to required domains; avoid <all_urls> and broad wildcard host patterns"
  evidence: |
    {
      "permissions": $prop($, 'cdx:chrome-extension:permissions'),
      "hostPermissions": $prop($, 'cdx:chrome-extension:hostPermissions')
    }

- id: CHE-002
  name: "Extension with network interception capabilities"
  description: "Extensions that combine webRequest and webRequestBlocking can intercept and modify browser network traffic"
  severity: critical
  category: chrome-extension
  dry-run-support: full
  condition: |
    components[
      $startsWith(purl, 'pkg:chrome-extension/')
      and $listContains($propList($, 'cdx:chrome-extension:permissions'), 'webRequest')
      and $listContains($propList($, 'cdx:chrome-extension:permissions'), 'webRequestBlocking')
    ]
  location: |
    {
      "bomRef": $. "bom-ref",
      "purl": purl,
      "srcFile": $prop($, 'SrcFile')
    }
  message: "Chrome extension '{{ name }}@{{ version }}' can intercept and block web requests"
  mitigation: "Review extension code for request filtering/modification logic; restrict deployment to trusted publishers"
  evidence: |
    {
      "permissions": $prop($, 'cdx:chrome-extension:permissions'),
      "contentScriptsRunAt": $prop($, 'cdx:chrome-extension:contentScriptsRunAt')
    }

- id: CHE-003
  name: "Always-early content scripts with broad access"
  description: "Extensions injecting content scripts at document_start together with broad host permissions increase pre-DOM execution risk"
  severity: high
  category: chrome-extension
  dry-run-support: full
  condition: |
    components[
      $startsWith(purl, 'pkg:chrome-extension/')
      and $listContains($propList($, 'cdx:chrome-extension:contentScriptsRunAt'), 'document_start')
      and (
        $listContains($propList($, 'cdx:chrome-extension:permissions'), '<all_urls>')
        or $listContains($propList($, 'cdx:chrome-extension:hostPermissions'), '<all_urls>')
        or $listContains($propList($, 'cdx:chrome-extension:hostPermissions'), '*://*/*')
      )
    ]
  location: |
    {
      "bomRef": $. "bom-ref",
      "purl": purl
    }
  message: "Chrome extension '{{ name }}@{{ version }}' injects scripts at document_start with broad site access"
  mitigation: "Prefer run_at=document_idle where possible and scope host permissions to explicit trusted origins"
  evidence: |
    {
      "contentScriptsRunAt": $prop($, 'cdx:chrome-extension:contentScriptsRunAt'),
      "permissions": $prop($, 'cdx:chrome-extension:permissions'),
      "hostPermissions": $prop($, 'cdx:chrome-extension:hostPermissions')
    }

- id: CHE-004
  name: "Autofill-capable extension with broad host permissions"
  description: "Autofill features handling credential or PII flows should be reviewed when broad host permissions are granted"
  severity: medium
  category: chrome-extension
  dry-run-support: full
  condition: |
    components[
      $startsWith(purl, 'pkg:chrome-extension/')
      and $propBool($, 'cdx:chrome-extension:hasAutofill') = true
      and (
        $listContains($propList($, 'cdx:chrome-extension:permissions'), '<all_urls>')
        or $listContains($propList($, 'cdx:chrome-extension:hostPermissions'), '<all_urls>')
        or $listContains($propList($, 'cdx:chrome-extension:hostPermissions'), '*://*/*')
      )
    ]
  location: |
    {
      "bomRef": $. "bom-ref",
      "purl": purl
    }
  message: "Autofill-capable extension '{{ name }}@{{ version }}' has broad host access"
  mitigation: "Review autofill data handling and origin checks; enforce least-privilege host permissions"
  evidence: |
    {
      "hasAutofill": $prop($, 'cdx:chrome-extension:hasAutofill'),
      "permissions": $prop($, 'cdx:chrome-extension:permissions'),
      "hostPermissions": $prop($, 'cdx:chrome-extension:hostPermissions'),
      "storageManagedSchema": $prop($, 'cdx:chrome-extension:storageManagedSchema')
    }

- id: CHE-005
  name: "Extension with file/device capability and broad host scope"
  description: "Extensions requesting file or device-adjacent capabilities alongside broad host scope can increase data collection and exfiltration risk."
  severity: high
  category: chrome-extension
  dry-run-support: full
  condition: |
    components[
      $startsWith(purl, 'pkg:chrome-extension/')
      and (
        $propBool($, 'cdx:chrome-extension:capability:fileAccess') = true
        or $propBool($, 'cdx:chrome-extension:capability:deviceAccess') = true
        or $propBool($, 'cdx:chrome-extension:capability:bluetooth') = true
      )
      and (
        $listContains($propList($, 'cdx:chrome-extension:permissions'), '<all_urls>')
        or $listContains($propList($, 'cdx:chrome-extension:hostPermissions'), '<all_urls>')
        or $listContains($propList($, 'cdx:chrome-extension:hostPermissions'), '*://*/*')
      )
    ]
  location: |
    {
      "bomRef": $. "bom-ref",
      "purl": purl,
      "srcFile": $prop($, 'SrcFile')
    }
  message: "Chrome extension '{{ name }}@{{ version }}' combines broad host scope with file/device capabilities"
  mitigation: "Review whether file/device permissions are required and narrow host permissions to explicit trusted origins."
  evidence: |
    {
      "capabilities": $prop($, 'cdx:chrome-extension:capabilities'),
      "permissions": $prop($, 'cdx:chrome-extension:permissions'),
      "hostPermissions": $prop($, 'cdx:chrome-extension:hostPermissions')
    }

- id: CHE-006
  name: "Code-injecting extension with broad host scope"
  description: "Extensions with explicit code-injection capability and broad host scope may execute arbitrary script logic across many origins."
  severity: critical
  category: chrome-extension
  dry-run-support: full
  condition: |
    components[
      $startsWith(purl, 'pkg:chrome-extension/')
      and $propBool($, 'cdx:chrome-extension:capability:codeInjection') = true
      and (
        $listContains($propList($, 'cdx:chrome-extension:permissions'), '<all_urls>')
        or $listContains($propList($, 'cdx:chrome-extension:hostPermissions'), '<all_urls>')
        or $listContains($propList($, 'cdx:chrome-extension:hostPermissions'), '*://*/*')
      )
    ]
  location: |
    {
      "bomRef": $. "bom-ref",
      "purl": purl,
      "srcFile": $prop($, 'SrcFile')
    }
  message: "Chrome extension '{{ name }}@{{ version }}' has code-injection capability with broad host coverage"
  mitigation: "Constrain host permissions and validate code-injection paths (scripting/tabs/debugger/content scripts) against strict allowlists."
  evidence: |
    {
      "capabilities": $prop($, 'cdx:chrome-extension:capabilities'),
      "permissions": $prop($, 'cdx:chrome-extension:permissions'),
      "contentScriptsRunAt": $prop($, 'cdx:chrome-extension:contentScriptsRunAt')
    }

- id: CHE-007
  name: "Fingerprinting-capable extension with broad host scope"
  description: "Fingerprinting-related capability indicators combined with broad host access can increase tracking and privacy risk."
  severity: high
  category: chrome-extension
  dry-run-support: full
  condition: |
    components[
      $startsWith(purl, 'pkg:chrome-extension/')
      and $propBool($, 'cdx:chrome-extension:capability:fingerprinting') = true
      and (
        $listContains($propList($, 'cdx:chrome-extension:permissions'), '<all_urls>')
        or $listContains($propList($, 'cdx:chrome-extension:hostPermissions'), '<all_urls>')
        or $listContains($propList($, 'cdx:chrome-extension:hostPermissions'), '*://*/*')
      )
    ]
  location: |
    {
      "bomRef": $. "bom-ref",
      "purl": purl,
      "srcFile": $prop($, 'SrcFile')
    }
  message: "Chrome extension '{{ name }}@{{ version }}' has fingerprinting indicators with broad host access"
  mitigation: "Review extension behavior for passive/active fingerprinting collection and reduce scope to required domains."
  evidence: |
    {
      "capabilities": $prop($, 'cdx:chrome-extension:capabilities'),
      "permissions": $prop($, 'cdx:chrome-extension:permissions'),
      "hostPermissions": $prop($, 'cdx:chrome-extension:hostPermissions')
    }

- id: CHE-008
  name: "AI-assistant extension with code injection on AI provider domains"
  description: "Extensions targeting AI assistant domains (OpenAI/ChatGPT/Claude/Copilot) with code-injection capability should be reviewed for prompt/session manipulation risk."
  severity: high
  category: chrome-extension
  dry-run-support: full
  condition: |
    components[
      $startsWith(purl, 'pkg:chrome-extension/')
      and $propBool($, 'cdx:chrome-extension:capability:codeInjection') = true
      and (
        $contains($safeStr($prop($, 'cdx:chrome-extension:hostPermissions')), 'openai.com')
        or $contains($safeStr($prop($, 'cdx:chrome-extension:hostPermissions')), 'chatgpt.com')
        or $contains($safeStr($prop($, 'cdx:chrome-extension:hostPermissions')), 'claude.ai')
        or $contains($safeStr($prop($, 'cdx:chrome-extension:hostPermissions')), 'github.com/copilot')
      )
    ]
  location: |
    {
      "bomRef": $. "bom-ref",
      "purl": purl,
      "srcFile": $prop($, 'SrcFile')
    }
  message: "AI-assistant extension '{{ name }}@{{ version }}' can inject code in assistant workflows"
  mitigation: "Review prompt/session handling, enforce least-privilege host permissions, and gate deployment to trusted publishers."
  evidence: |
    {
      "capabilities": $prop($, 'cdx:chrome-extension:capabilities'),
      "permissions": $prop($, 'cdx:chrome-extension:permissions'),
      "hostPermissions": $prop($, 'cdx:chrome-extension:hostPermissions')
    }