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Open Banking Configuration
Janssen supports Open banking use cases:
- Dynamic Client Registration
- Payment Authorization
- Identity - eKYC
- Client Initiated Authentication (mobile / out-of-band)
Its best to use the cloud native deployment for open banking so you can take advantage of auto-scaling, high availability, and operational automation. However, for development and testing we also support its VM distribution.
The subsequent parts of this section cover details on its installation, configuration and settings related to the registering an OpenID client,Pushed authorization requests (PAR), JWT Secured Authorization Response Mode (JARM) and MTLS.
This section covers details on setting-up the Openbanking use-case in a Janssen VM. We recommend the Cloud Native Distribution for production environment. However, for development and testing VM distribution will be easier. It can be installed on any of the main Linux distributions.
Prepare a Linux VM with the following minimum specs (recommended):
- 4 GB RAM
- 2 GB swap space
- 2 CPU units
- 50 GB disk space
The VM must have a static IP address and a resolvable hostname. A fully qualified domain name (FQDN) is required for production deployments.
Download the installer (install.py)
wget https://raw.githubusercontent.com/JanssenProject/jans/main/jans-linux-setup/jans_setup/install.py
Execute the installer:
sudo python3 install.py --profile openbanking
The installation script will install required tools, programs, packages and then it will prompt the user for setup instructions. Answer the following questions:
| Prompt | Description |
|---|---|
| Enter IP Address | The IP address for the VM. Use an IP address assigned to one of this server's network interfaces (usage of addresses assigned to loopback interfaces is not supported) |
| Enter Hostname | The hostname for the VM. Recommended to be a FQDN |
| Enter your city or locality | Used to generate X.509 certificates. |
| Enter your state or province two letter code | Used to generate X.509 certificates. |
| Enter two letter Country Code | Used to generate X.509 certificates. |
| Enter Organization Name | Used to generate X.509 certificates. |
| Enter email address for support at your organization | Used to generate X.509 certificates. |
| Prompt | Description |
|---|---|
| Enter maximum RAM for applications in MB | Maximum RAM Size in MB |
| RDBM Type | Backend type. Currently only MySQL is supported |
| Use remote RDBM | Select if connecting to an external MySQL server |
| Enter Openbanking static kid | The fallback key when key is not passed in requests (as required by Openbanking) |
| Use external key | If yes, link to an external Open Banking key file |
Before the last question installer process will display the selected choices and confirms to proceed. as
| Prompt | Description |
|---|---|
| Proceed with these values [Y/n] | Confirmation before setting up the services. |
Execute the installation script with the -uninstall argument.
For MTLS, OBIE-issued (for openbanking UK) certificates and keys should be used. The following discussion assumes that the file ca.crt has a CA certificate and ca.key has a CA private key.
Following command generates self-signed ca.crt and ca.key:
openssl req -newkey rsa:2048 -nodes -keyform PEM -keyout ca.key -x509 -days 3650 -outform PEM -out ca.crt
The following set of commands is an example of how to create the server’s private key (server.key), Certificate Signing Request (CSR) (server.csr) and certificate (server.crt):
openssl genrsa -out server.key 2048
openssl req -new -key server.key -out server.csr
openssl x509 -req -in server.csr -CA ca.crt -CAkey ca.key -set_serial 100 -days 365 -outform PEM -out server.crt
Now, store the server key (server.key) and certificate (server.crt) file in some location (preferably inside /etc/certs) and set its path in the apache .conf file (/etc/apache2/sites-enabled/https_jans.conf) with SSLCertificateFile and SSLCertificateKeyFile directives:
SSLCertificateFile /etc/certs/bank/server.crt
SSLCertificateKeyFile /etc/certs/bank/server.key
The path of CA certificate file should be set to SSLCACertificateFile directive as:
SSLCACertificateFile /etc/apache2/certs/matls.pem
The following commands will create client’s private key (client.key), CSR (client.csr) and certificate (client.crt):
openssl genrsa -out client.key 2048
openssl req -new -key client.key -out client.csr
openssl x509 -req -in client.csr -CA ca.crt -CAkey ca.key -set_serial 101 -days 365 -outform PEM -out client.crt
The following command will create a client certification chain (private key, public certificate and ca certificate) into the file client.pem:
cat client.key client.crt ca.crt >client.pem
Use this pem file to create JWKs for the clients (if required). To create a JWK, you can use a free utility published at https://mkjwk.org. Or you can download the command-line tool from GitHub. There are numerous other online PEM-to-JWKS tools available like JWKConvertFunctions. We may need to add/update some data in these generated JWKs.
!!!Note It is important to give different values of the Common Name field (“Common Name (e.g. server FQDN or YOUR name) []”) for the CA, Server and clients. Other fields may have common values but the same values for Common Name of all certificates results in certificate verification failed at runtime.
Importing the CA certificate in JVM truststore and signing, encryption keys into auth-Server keystore:
The command line utility keytool is installed with JDK, it can be used to import the CA certificate in JVM truststore (/opt/jre/lib/security/cacerts) and signing,encryption keys into the jans-auth server’s keystore(/etc/certs/jans-auth-keys.jks).
./keytool -importcert -file /path/to/file/filename.cer -keystore /etc/certs/jans-auth-keys.jks -alias yourkeystore
./keytool -importkeystore -srckeystore /path/to/file/filename.jks -srcstoretype JKS -destkeystore /opt/jre/lib/security/cacerts -deststoretype JKS
After successful installation, we have following two methods to access the Open Banking Platform, as discussed in the subsequent text:
- jans-cli (recommended) or
- curl