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update certificate pinning example

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Wonderfall 2022-03-02 20:07:11 +01:00
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content/posts/fdroid-issues.md
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@ -89,14 +89,14 @@ As a matter of fact, the [new unattended update API](https://developer.android.c
Their client also lacks **TLS certificate pinning**, unlike Play Store which does that for all connections to Google. Certificate pinning is a way for apps to increase the security of their connection to services [by providing a set of public key hashes](https://developer.android.com/training/articles/security-config#CertificatePinning) of known-good certificates for these services instead of trusting pre-installed CAs. This can avoid some cases where an interception (*man-in-the-middle* attack) could be possible and lead to various security issues considering you're trusting the app to deliver you other apps. Their client also lacks **TLS certificate pinning**, unlike Play Store which does that for all connections to Google. Certificate pinning is a way for apps to increase the security of their connection to services [by providing a set of public key hashes](https://developer.android.com/training/articles/security-config#CertificatePinning) of known-good certificates for these services instead of trusting pre-installed CAs. This can avoid some cases where an interception (*man-in-the-middle* attack) could be possible and lead to various security issues considering you're trusting the app to deliver you other apps.
It is an important security feature that is also straightforward to implement using the [declarative network security configuration](https://developer.android.com/training/articles/security-config) available since Android 7.0 (API level 24). See how GrapheneOS pins both root and CA certificates in [Auditor](https://github.com/GrapheneOS/Auditor) for their attestation service: It is an important security feature that is also straightforward to implement using the [declarative network security configuration](https://developer.android.com/training/articles/security-config) available since Android 7.0 (API level 24). See how GrapheneOS pins both root and CA certificates in their [app repository client](https://github.com/GrapheneOS/Apps):
``` ```
<!-- res/xml/network_security_config.xml --> <!-- res/xml/network_security_config.xml -->
<network-security-config> <network-security-config>
<base-config cleartextTrafficPermitted="false"/> <base-config cleartextTrafficPermitted="false"/>
<domain-config> <domain-config>
<domain includeSubdomains="true">attestation.app</domain> <domain includeSubdomains="true">apps.grapheneos.org</domain>
<pin-set> <pin-set>
<!-- ISRG Root X1 --> <!-- ISRG Root X1 -->
<pin digest="SHA-256">C5+lpZ7tcVwmwQIMcRtPbsQtWLABXhQzejna0wHFr8M=</pin> <pin digest="SHA-256">C5+lpZ7tcVwmwQIMcRtPbsQtWLABXhQzejna0wHFr8M=</pin>