react-native-cert-pinner-wfo
v0.4.12
Published
For React Native, pins TLS connections to specific trusted certificates' public keys
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#Disclamer This is a fork of react-native-cert-pinner (https://www.npmjs.com/package/react-native-cert-pinner) (forked from v0.4.1) to accept self-signed SSL certificates To build the android lib (.aar):
- open project in Android Studio
- launch gradle build for ./android
- get the .aar file in .android/build/output/aar
react-native-cert-pinner
IMPORTANT: This repository relates to Approov 1 and has not been updated to reflect the new features and usage of Approov 2, the latest version of Approov. We will be updating the repository soon. Meanwhile, please refer to the guide for migrating from Approov 1 to Approov 2.
This package manages TLS certificate pinning in react-native for Android and iOS.
Getting started
$ npm install react-native-cert-pinner-wfo --save
Mostly automatic installation
$ react-native link react-native-cert-pinner-wfo
Manual installation
iOS
Add the following line to the project targets in your Podfile
:
pod 'TrustKit', '~> 1.4.2'
Then run pod install.
Android
- Open up
android/app/src/main/java/[...]/MainApplication.java
- Add
import com.criticalblue.reactnative.CertPinnerPackage;
to the imports at the top of the file - Add
new CertPinnerPackage()
to the list returned by thegetPackages()
method
- Append the following lines to
android/settings.gradle
:include ':react-native-cert-pinner-wfo' project(':react-native-cert-pinner-wfo').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-cert-pinner-wfo/android')
- Insert the following lines inside the dependencies block in
android/app/build.gradle
:compile project(':react-native-cert-pinner-wfo')
Usage
To use the react-native networking utilities, like fetch()
, certificate pinning must be done in the native app before the app's react-native javascript is run.
Unlike typical installed packages, there is no need to require any modules in the javascript. Everything is setup and enforced inside the native module.
Certificate Pinning Configuration
A pinset
utility is provided to help configure the native modules for pinning.
The default setup assumes you are running in your project's home directory. The default configuration file is ./pinset.json
, and the default native android project is assumed to be located at ./android
. Both these locations may be overriden on the command line.
Command Help
To get help:
$ npx pinset -h
pinset [command] [options]
init ..... initialize pinset configuration
gen ...... generate pinset configuration
version .. show package version
help ..... show help menu for a command
or for a sub-command:
$ npx pinset help gen
pinset gen [options] [config]
--android, -a <path> .. path to Android project (defaults to './android')
--ios, -i <path> ...... path to iOS project (defaults to './ios')
--force, -f ........... always overwrite existing configuration
config ................ configuration file - defaults to 'pinset.json'
Initialization
The first step is to generate a starter configuration:
$ npx pinset init
This command will not overwrite an existing configuration file unless the --force
flag is used.
Lookup
Next, determine which URLs you want to pin, and determine each certificate's public key hash. A convenient utility is provided by Report URI at https://report-uri.com/home/pkp_hash. Enter a URL to see the current chain of certificate hashes.
Enter the desired public key hashes into the pinset.json
file:
{
"domains": {
"*.approov.io": {
"pins": [
"sha256/0000000000000000000000000000000000000000000",
"sha256/1111111111111111111111111111111111111111111"
]
},
"*.criticalblue.com": {
"pins": [
"sha256/2222222222222222222222222222222222222222222",
"sha256/3333333333333333333333333333333333333333333"
]
}
}
}
Domains starting with*.
will include all subdomains.
It is recommended to select multiple hashes with at least one of them being from an intermediate certificate.
Generation
Once the configuration is set, generate the native project sources:
$ npx pinset gen
Reading config file './pinset.json'.
Updating java file './android/app/src/main/java/com/criticalblue/reactnative/GeneratedCertificatePinner.java'.
Updating plist file './ios/example/info.plist'.
Build and run the react-native app, for example:
$ react-native run-ios
Updates
To update the certificate pins, edit the configuration file, regenerate the native sources, and rebuild the app.
Note, there is no way to update the pin sets from javascript while the app is running.
Certificate Security
If you consider publishing hashes of public key certificates to be a security breach, you may want to remove or ignore the pinset configuration and generated fines from your repository.
To ignore the default files in a git repository, add to .gitignore
:
# default configuration file
./pinset.json
# default generated android source
./android/app/src/main/java/com/criticalblue/reactnative/GeneratedCertificatePinner.java
./ios/<your project here>/info.plist
Future Enhancements
- Automatically regenerate native source files whenever the pin set configuration changes.
- Add source regeneration and git ignores to the mostly automatic react-native linking step.
- Add certificate lookup to the
pinset
utility. - Better secure pinset information within the app.