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tutorial-baeldung-spring-security-cas-sso

Tutorial: https://www.baeldung.com/spring-security-cas-sso

Git

Git submodule

Cloning repo with submodule:

git clone --recursive [URL]

If you already have the repo but not its submodule (--recursive is for all the sub-submodule):

git submodule update --init --recursive

You can download multiple ones at the same time by adding --jobs 8 or -j 8 (8 being the number of repos pulled at the same time) flag to the previous command.

Pulling for repo plus submodule:

git pull --recursive-submodules

Pulling all changes for the submodules:

git submodule update --remote

Executing a command on every submodule:

git submodule foreach 'git reset --hard'
# With nested submodules: 
git submodule foreach --recursive 'git reset --hard'

Configuration

You can move the configurations with this command (by default it gets it from cas-server/etc/cas/config):

./gradlew copyCasConfiguration

Note: The specifics of the build are controlled using the gradle.properties file.

This is the code that is run (cas-server/gradle/tasks.gradle):

task copyCasConfiguration(type: Copy, group: "CAS",
        description: "Copy the CAS configuration from this project to /etc/cas/config") {
    from "etc/cas/config"
    into new File('/etc/cas/config').absolutePath
    doFirst {
        new File('/etc/cas/config').mkdirs()
    }
}

Tutorial

Basic setup

Add the CAS server:

git submodule add https://github.com/apereo/cas-overlay-template.git cas-server

In build.gradle add in dependencies:

implementation "org.apereo.cas:cas-server-support-json-service-registry:${project.'cas.version'}"
implementation "org.apereo.cas:cas-server-support-jdbc:${project.'cas.version'}"

In cas-server/src/main/resources add:

server.port=8443
spring.main.allow-bean-definition-overriding=true
server.ssl.key-store=classpath:/etc/cas/thekeystore
server.ssl.key-store-password=changeit

In cas-server/src/main/resources:

mkdir -p /etc/cas/config

In this new created directory cas-server/src/main/resources/etc/cas/config (for each question put in localhost to avoid SSL handshake error,):

keytool -genkey -keyalg RSA -alias thekeystore -keystore thekeystore -storepass changeit -validity 360 -keysize 2048

Make sure echo $JAVA11_HOME is not empty if it is then to this:

export JAVA11_HOME=$(dirname $(dirname $(readlink -f $(which javac))))

The next step here is to import thekeystore that was just generated (in the tutorial the destination is $JAVA11_HOME/jre/lib/security/cacerts but for me there is no jre... you might need to verify. The security/cacerts directories should already exist) (FYI: the password it asking is: changeit):

keytool -importkeystore -srckeystore thekeystore -destkeystore $JAVA11_HOME/lib/security/cacerts

Then you can run it:

./gradlew run -Dorg.gradle.java.home=$JAVA11_HOME

Once it says READY you can then go to: https://localhost:8443/ WARNING! By default they are no username or password. You will need to continue to the next section to set that up.

CAS Server User Configuration

In cas-server/etc/cas/ add the directory config.

mkdir -p cas-server/etc/cas/config

Inside that new directory create: cas.property file In cas.property add (this will be a username and password because by default they are none):

cas.authn.accept.users=casuser::Mellon
./gradlew run -Dorg.gradle.java.home=$JAVA11_HOME -Pargs="-Dcas.standalone.configurationDirectory=/cas-server/src/main/resources/etc/cas/config"

Once READY go to : https://localhost:8443

And login with:

  • username: casuser
  • password: Mellon

CAS Client Setup

Troubleshoot

Note: You can find some interesting details about CAS settings in the config-metadata.properties that you can generate: ./gradlew exportConfigMetadata (Warning! The file is pretty big).

cas.authn.pm.json.location: does not work

You may need to adjust the total number of {@code inotify} instances. On Linux, you may need to add the following line to /etc/sysctl.conf: fs.inotify.max_user_instances = 256.

You can check the current value via

  • cat /proc/sys/fs/inotify/max_user_instances
  • sudo sysctl -n fs.inotify.max_user_instances

Change it:

  • vim /etc/sysctl.conf
  • sudo sysctl -w fs.inotify.max_user_instances=256

To reload after you modified in the config file:

  • sudo sysctl -p

Sources