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spring-boot-ssl-mutual-authentication

Spring Boot Secure Server and Clients that requires mutual authentication

There are three projects in this repo:

  • secure-server: available at https://localhost:8443
  • secure-client: available at http://localhost:8080
  • secure-client2: available at http://localhost:8282

Testing with self signed certificates:

  1. Generating the Server Keystore: keytool -genkeypair -alias secure-server -keyalg RSA -dname "CN=localhost,OU=myorg,O=myorg,L=mycity,S=mystate,C=es" -keypass secret -keystore server-keystore.jks -storepass secret

  2. Generating the Client Keystore: keytool -genkeypair -alias secure-client -keyalg RSA -dname "CN=codependent-client,OU=myorg,O=myorg,L=mycity,S=mystate,C=es" -keypass secret -keystore client-keystore.jks -storepass secret

  3. Import the supported client's public certificates intro the server truststore:

  • Export the client public certificate: keytool -exportcert -alias secure-client -file client-public.cer -keystore client-keystore.jks -storepass secret
  • Import it in the server truststore: keytool -importcert -keystore server-truststore.jks -alias clientcert -file client-public.cer -storepass secret
  1. Import the server's public certificate into the client truststores:
  • Export the server public certificate: keytool -exportcert -alias secure-server -file server-public.cer -keystore server-keystore.jks -storepass secret
  • Import it in the client truststore: keytool -importcert -keystore client-truststore.jks -alias servercert -file server-public.cer -storepass secret

To check the proyect start both Spring Boot applications and access secure-client -> http://localhost:8080. It will call https://localhost:8443 and if everything goes OK you'll see "Hello codependent-client1!"

if you want to access https://localhost:8443 from the browser you'll have to install the certificate in it. To export it: keytool -importkeystore -srckeystore client-keystore.jks -destkeystore codependent-client.p12 -deststoretype PKCS12

Testing with signed certificates using a CA Certificate:

  1. The server keystore is the same generated in Testing with self signed certificates step 1

  2. The client truststores are the same from Testing with self signed certificates step 4

  3. Create a CA

openssl req -new -x509 -keyout codependent-ca-key.pem -out codependent-ca.pem -days 365

Generating a 2048 bit RSA private key
..........................+++
.......................................................................................+++
writing new private key to 'codependent-ca-key.pem'
Enter PEM pass phrase:
Verifying - Enter PEM pass phrase:
-----
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [AU]:es
State or Province Name (full name) [Some-State]:mad
Locality Name (eg, city) []:mad
Organization Name (eg, company) [Internet Widgits Pty Ltd]:Codependent Ltd
Organizational Unit Name (eg, section) []:dev
Common Name (e.g. server FQDN or YOUR name) []:codependent-ca
Email Address []:

This generates two files codependent-ca.pem and codependent-ca-key.pem

Now, FOR EVERY CLIENT:

  1. Create the server truststore including the client CA:

keytool -import -alias codependent-ca -file codependent-ca.pem -keystore server-truststore.jks -storepass secret

  1. Generate an unsigned client certificate for secure-client:

keytool -genkeypair -alias secure-client -keyalg RSA -dname "CN=codependent-client1,OU=myorg,O=myorg,L=mycity,S=mystate,C=es" -keypass secret -keystore client-keystore.jks -storepass secret

NOTE: use CN=codependent-client1 for secure-client and cn=codependent-client2 for secure-client2

  1. Generate the Certificate Signing Request:

keytool -keystore client-keystore.jks -certreq -alias secure-client -keyalg rsa -storepass secret

Paste the content in a unsigned-client.csr file

  1. Generate a signed certificate for the associated Certificate Signing Request:

openssl x509 -req -CA codependent-ca.pem -CAkey codependent-ca-key.pem -in unsigned-client.csr -out signed-client.cer -days 365 -CAcreateserial

You get a signed-client.cer file.

  1. Import the CA and the client signed certificate into the client keystore:

keytool -import -keystore client-keystore.jks -file codependent-ca.pem -alias codependent-ca keytool -import -keystore client-keystore.jks -file signed-client.cer -alias secure-client

References: