Security/Download Protection
< Security
Description
This feature protects users against malware downloads. It is based on Safe Browsing.
See Security/Features/Application_Reputation_Design_Doc for implementation details.
Prefs
- browser.safebrowsing.downloads.enabled: enables application reputation checks for downloaded files
- browser.safebrowsing.downloads.remote.enabled: enables remote lookups (requires the previous pref)
- browser.safebrowsing.downloads.remote.timeout_ms: timeout for the remote lookups
- browser.safebrowsing.malware.enabled: enables malware checks (required by application reputation)
- browser.safebrowsing.provider.google.lists: list of tables coming from the Google Safe Browsing service
- urlclassifier.downloadAllowTable: list of trusted certificates which suppress remote lookups (Windows-only)
- urlclassifier.downloadBlockTable: list of URLs serving malware binaries
Firefox 45 and earlier:
- browser.safebrowsing.appRepURL: server endpoint for remote lookups
Firefox 46 and later:
- browser.safebrowsing.downloads.remote.url: server endpoint for remote lookups
Engineering
Product/Component: Toolkit/Safe Browsing
Most of the code lives in toolkit/components/downloads/ApplicationReputation.cpp.
QA
To turn on debugging output, export the following environment variable:
MOZ_LOG_FILE=/tmp/apprep.log MOZ_LOG="ApplicationReputation:5"
Telemetry
- APPLICATION_REPUTATION_COUNT: number of download lookups through the application reputation code
- APPLICATION_REPUTATION_LOCAL: results of the local checks (whitelist and blacklist)
- APPLICATION_REPUTATION_SERVER
- APPLICATION_REPUTATION_SERVER_VERDICT: results (verdict) we got back from the remote server lookup
- APPLICATION_REPUTATION_SHOULD_BLOCK: whether or not a download has been blocked due to an application reputation lookup (local or remote)
Documentation
- Security/Features/Application_Reputation_Design_Doc (API Documentation available internally under NDA)
- Content-Agnostic Malware Protection (paper describing how the whole system is implemented)
- Chromium source code
- Announcement blog post