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Security/Tracking protection

2,198 bytes added, 18:16, 21 May 2018
Code walkthrough: add a walktrough of the actual classification
=== Code walkthrough ===
 
The classification for tracking protection, separate from the [[Security/Safe_Browsing#Code_walkthrough|full Safe Browsing classification]],
is kicked off in [https://searchfox.org/mozilla-central/rev/8affe6e83188787eb61fe0528eeb6eef6081ba06/netwerk/protocol/http/nsHttpChannel.cpp#6385 <tt>nsHttpChannel::BeginConnectContinue()</tt>] and goes like this:
 
1. we asynchronously [https://searchfox.org/mozilla-central/rev/8affe6e83188787eb61fe0528eeb6eef6081ba06/netwerk/base/nsChannelClassifier.cpp#1225 check the blacklist]
2. if there's a match, we then [https://searchfox.org/mozilla-central/rev/8affe6e83188787eb61fe0528eeb6eef6081ba06/netwerk/base/nsChannelClassifier.cpp#974 check the entity whitelist]
3. if it doesn't match the whitelist, we [https://searchfox.org/mozilla-central/rev/8affe6e83188787eb61fe0528eeb6eef6081ba06/netwerk/base/nsChannelClassifier.cpp#1011 treat it as a tracker]
4. we either [https://searchfox.org/mozilla-central/rev/8affe6e83188787eb61fe0528eeb6eef6081ba06/netwerk/base/nsChannelClassifier.cpp#1023 cancel the channel] (for full tracking protection) or [https://searchfox.org/mozilla-central/rev/8affe6e83188787eb61fe0528eeb6eef6081ba06/netwerk/base/nsChannelClassifier.cpp#1027 set a tracking flag] (for tracking annotations only)
 
Note that only [https://searchfox.org/mozilla-central/rev/8affe6e83188787eb61fe0528eeb6eef6081ba06/netwerk/base/nsChannelClassifier.cpp#319 eligible resources] are run through the classifier:
 
- must not be a [https://searchfox.org/mozilla-central/rev/8affe6e83188787eb61fe0528eeb6eef6081ba06/netwerk/base/nsChannelClassifier.cpp#355-375 first-party or top-level load]
- addons can request [https://searchfox.org/mozilla-central/rev/8affe6e83188787eb61fe0528eeb6eef6081ba06/netwerk/base/nsChannelClassifier.cpp#384-386 permission to load tracking resources]
- we check the permission manager for any [https://searchfox.org/mozilla-central/rev/8affe6e83188787eb61fe0528eeb6eef6081ba06/netwerk/base/nsChannelClassifier.cpp#406-431 manual user overrides] (and an [https://searchfox.org/mozilla-central/rev/8affe6e83188787eb61fe0528eeb6eef6081ba06/netwerk/base/nsChannelClassifier.cpp#433-450 in-memory list in Private Browsing])
Tracking annotations are used in four different places:
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