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Issue #433: Fretboard: Certificate pinning #446

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@fercarcedo
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@fercarcedo fercarcedo commented Jul 18, 2018

This pull request introduces certificate pinning. It adds a pinCertificates method to ExperimentSource with a set of base64-encoded SHA-256 of the certificate subject public key info.

The implementation first gets the list of trusted certificates as detailed, cleaning the certificate chain using X509TrustManagerExtensions as described here and here.

I also discovered there are libraries available such as TrustKit which replicate the behavior of Android N+ Network Security Configuration, but I decided against using it because it adds extra bloat to the library and also the user has to create an XML file and register it on the Manifest, I don't know if you have different opinion.

Closes #433

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@codecov codecov bot commented Jul 18, 2018

Codecov Report

Merging #446 into master will decrease coverage by 0.02%.
The diff coverage is 76.47%.

Impacted file tree graph

@@             Coverage Diff              @@
##             master     #446      +/-   ##
============================================
- Coverage     77.33%   77.31%   -0.03%     
- Complexity      955      966      +11     
============================================
  Files           146      147       +1     
  Lines          3446     3478      +32     
  Branches        487      490       +3     
============================================
+ Hits           2665     2689      +24     
- Misses          534      540       +6     
- Partials        247      249       +2
Impacted Files Coverage Δ Complexity Δ
...ce/fretboard/source/kinto/KintoExperimentSource.kt 90% <100%> (+0.34%) 13 <2> (+1) ⬆️
...tboard/source/kinto/HttpURLConnectionHttpClient.kt 79.16% <75%> (-3.19%) 9 <3> (+2)
...ervice/fretboard/source/kinto/CertificatePinner.kt 75% <75%> (ø) 8 <8> (?)

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@pocmo pocmo added the blocked label Jul 26, 2018
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@pocmo pocmo commented Jul 26, 2018

Blocked:

  • Pending security review

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@pocmo pocmo commented Jul 26, 2018

@fercarcedo Can you rebase this branch? There are some conflicts here. :)

@fercarcedo fercarcedo force-pushed the fretboard-certificate-pinning branch from 0a99d36 to f8fc311 Jul 26, 2018
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@fercarcedo fercarcedo commented Jul 26, 2018

Rebased

@fercarcedo fercarcedo force-pushed the fretboard-certificate-pinning branch from f8fc311 to f11af34 Jul 26, 2018
@fercarcedo fercarcedo force-pushed the fretboard-certificate-pinning branch 4 times, most recently from f7bf463 to cdf123a Aug 8, 2018
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@pocmo pocmo commented Aug 21, 2018

Given the feedback of the security team I think we should move forward without certificate pinning. Signature validation is a stronger signal and does not have all the problems that come with cert pinning.

@pocmo pocmo closed this Aug 21, 2018
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