Security/Download Protection: Difference between revisions
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(→Engineering: Link to the only user of the ApplicationReputationService.) |
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* [https://bugzilla.mozilla.org/show_bug.cgi?id=662819 Tracking bug] | * [https://bugzilla.mozilla.org/show_bug.cgi?id=662819 Tracking bug] | ||
Most of the code lives in <tt>toolkit/components/downloads/ApplicationReputation.cpp</tt>. | Most of the code lives in <tt>toolkit/components/downloads/ApplicationReputation.cpp</tt>. The lookup is requested from within [https://searchfox.org/mozilla-central/rev/d67ef71097da4d1aa344c9d9c672e49a7228e765/toolkit/components/jsdownloads/src/DownloadIntegration.jsm#468-482 toolkit/components/jsdownloads/src/DownloadIntegration.jsm]. | ||
Upstream list of file extensions: | Upstream list of file extensions: | ||
Revision as of 22:11, 13 June 2017
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.downloads.remote.url: server endpoint for 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
Engineering
Product/Component: Toolkit/Safe Browsing
Most of the code lives in toolkit/components/downloads/ApplicationReputation.cpp. The lookup is requested from within toolkit/components/jsdownloads/src/DownloadIntegration.jsm.
Upstream list of file extensions:
- Shipped to Chrome via a "File Type Policies" Chrome extension (see chrome://components)
- Binary protobuf extractor
- Source protobuf
QA
To turn on debugging output, export the following environment variable:
MOZ_LOG_FILE=/tmp/apprep.log MOZ_LOG="ApplicationReputation:5"
Telemetry
Alerts are sent to safebrowsing-telemetry@mozilla.org.
- 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_REMOTE_LOOKUP_TIMEOUT: whether or not a client timed out while contacting the remote lookup server
- APPLICATION_REPUTATION_SERVER: whether the response from the remote server was valid, invalid (failed to parse as a protobuf) or failed in some other way
- 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
- Google API documentation (internal access only)
- Content-Agnostic Malware Protection (paper describing how the whole system is implemented)
- Chromium source code
- Announcement blog post