: 7

Mainly, this project is a oAuth2 POC, consists of all 3 oAuth parties: the authentication server, a resource server, and a client app. Each party is represented by its own WAR. In addition, the Authentication-Flows is a sub-module here.

23-02-2016: Spring Versions Updated

On 23-02-2016, we have updated Spring versions to the newest!

  • Spring Security: 4.0.3.RELEASE
  • Spring: 4.2.4.RELEASE
  • Spring Security oAuth: 2.0.9.RELEASE

In addition, we have changed the build tool from Maven to Gradle. If you wish to use the older version, i.e. Maven and older Spring versions (3.1.X, oAuth 1.0.5), you can find it on a separated branch. The version in that branch is 1.6.2-SNAPSHOT (you can find in Maven Central the latest release, 1.6.2). The version on Master is 2.0.0-SNAPSHOT.

Make it work

  • Deploy all 3 WARs on a servlet container, e.g. tomcat.
  • Browse http://localhost:8080/oauth2-client/hello. The client needs a login by itsealf: admin/admin (Spring Security expects your client web-app to have its own credentials).
  • client app tries to call the resource-server url http://localhost:8080/oauth2-resource-server/welcome
  • This will redirect to oauth2.0 authentication server. Login to authentication-server, currently it is from mem: demo@ohadr.com/demo. it can be configured to read from a DB.
  • client should access the resource server using the access-token, and print a message.

JAR: Authentication-Flows Maven Central

The Authentication-Flows JAR implements all authentication flows:

  • create account,
  • forgot password,
  • change password by user request,
  • force change password if password is expired,
  • locks the accont after pre-configured login failures.

It's own README explains in detail all required configurations, API and more.

The authentication-flows JAR uses cryptography in order to encrypt the data in the links that are sent to the user's email, upon user's registration and "forget password" flows. Read more about the encryption module here.

JAR: common-crypto Maven Central

Both oAuth identity-provider and the authentication-flows JAR use cryptography in order to encrypt the data:

  • oAuth encrypts the access-token
  • authentication-flows encrypts the user's password,
  • authentication-flows encrypts the links that are sent to the user's email, upon user's registration and "forget password" flows.

The utility JAR, called "common-crypto", makes life easier. You can find it in this project, and it is available in Maven Central Repository as well.

See its own README.

JAR: auth-common Maven Central

common code for authentication. You can find it also in this project, and also it is available in Maven repository:


Note the version - make sure you use the latest.

  1. a keystore shall be created, both for SSL and for signing the tokens.
  2. its alias and password should be updated in the prop file as well as in the tomcat's server.xml
  3. algorithm should be DSA (because in the access-token signature my code expects it to be "SHA1withDSA"
  4. if you want to work with "localhost", you should make the name "localhost":
  5. http://stackoverflow.com/questions/6908948/java-sun-security-provider-certpath-suncertpathbuilderexception-unable-to-find/12146838#12146838

creating a token using Java's keytool: keytool.exe -genkeypair -alias -keypass -keyalg DSA -keystore -storepass -storetype JCEKS -v

for example: C:\Dev\Tools>"%JAVA_HOME%\bin\keytool.exe" -genkeypair -alias alias -keypass kspass -keystore ohad.ks -storepass kspass -keyalg DSA -storetype JCEKS -v

Note that your servlet container will have to be adapted to use this keysotre (for https use). For example, if you used the command above to create the keysotre, and you use tomcat, your server.xml file will have this section:

	<Connector port="8443" SSLEnabled="true" clientAuth="false" 
			keystoreFile="c:\dev\tools\ohad.ks" keystorePass="kspass" 
			keyAlias="alias" keystoreType="JCEKS"
			maxThreads="150" protocol="HTTP/1.1" scheme="https" 
			secure="true" sslProtocol="TLS"/>    

Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
SecretKeySpec secretKey = new SecretKeySpec(key, "AES"); cipher.init(Cipher.ENCRYPT_MODE, secretKey); String encryptedString = Base64.encodeBase64String(cipher.doFinal(strToEncrypt.getBytes())); return encryptedString;

http://techie-experience.blogspot.co.il/2012/10/encryption-and-decryption-using-aes.html http://docs.oracle.com/javase/7/docs/api/javax/crypto/Cipher.html#init(int, java.security.Key)

HTML forms: onSubmit vs action

Why "Secret Question" mechanism is a Bad Thing

The logic of "Secret Question" escapes me. Since the dawn of computer security we have been telling people, "DON'T make a password that is information about yourself that a hacker could discover or guess, like the name of your high school, or your favorite color. A hacker might be able to look up the name of your high school, or even if they don't know you or know anything about you, if you still live near where you went to school they might get it by tryinging local schools until they hit it. There are a small number of likely favorite colors so a hacker could guess that. Etc. Instead, a password should be a meaningless combination of letters, digits, and punctuation." But now we also tell them, "But! If you have a difficult time remembering that meaningless combination of letters, digits, and punctuation, no problem! Take some information about yourself that you can easily remember -- like the name of your high school, or your favorite color -- and you can use that as the answer to a 'security question', that is, as an alternative password."

Indeed, security questions make it even easier for the hacker than if you just chose a bad password to begin with. At least if you just used a piece of personal information for your password, a hacker wouldn't necessarily know what piece of personal information you used. Did you use the name of your dog? Your birth date? Your favorite ice cream flavor? He'd have to try all of them. But with security questions, we tell the hacker exactly what piece of personal information you used as a password!

Instead of using security questions, why don't we just say, "In case you forget your password, it is displayed on the bottom of the screen. If you're trying to hack in to someone else's account, you are absolutely forbidden from scrolling down." It would be only slightly less secure. source

Why should we NEVER use CAPTCHA

Well, here is why.

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