CAS server source code, I have the main part of single sign.

cas-server-3.1
..............\assembly.xml
..............\cas-server-core
..............\...............\pom.xml
..............\...............\src
..............\...............\...\main
..............\...............\...\....\java
..............\...............\...\....\....\org
..............\...............\...\....\....\...\jasig
..............\...............\...\....\....\...\.....\cas
..............\...............\...\....\....\...\.....\...\authentication
..............\...............\...\....\....\...\.....\...\..............\AbstractAuthentication.java
..............\...............\...\....\....\...\.....\...\..............\Authentication.java
..............\...............\...\....\....\...\.....\...\..............\AuthenticationManager.java
..............\...............\...\....\....\...\.....\...\..............\AuthenticationManagerImpl.java
..............\...............\...\....\....\...\.....\...\..............\AuthenticationMetaDataPopulator.java
..............\...............\...\....\....\...\.....\...\..............\DirectMappingAuthenticationManagerImpl.java
..............\...............\...\....\....\...\.....\...\..............\handler
..............\...............\...\....\....\...\.....\...\..............\.......\AuthenticationException.java
..............\...............\...\....\....\...\.....\...\..............\.......\AuthenticationHandler.java
..............\...............\...\....\....\...\.....\...\..............\.......\BadCredentialsAuthenticationException.java
..............\...............\...\....\....\...\.....\...\..............\.......\BadPasswordAuthenticationException.java
..............\...............\...\....\....\...\.....\...\..............\.......\BadUsernameOrPasswordAuthenticationException.java
..............\...............\...\....\....\...\.....\...\..............\.......\BlockedCredentialsAuthenticationException.java
..............\...............\...\....\....\...\.....\...\..............\.......\DefaultPasswordEncoder.java
..............\...............\...\....\....\...\.....\...\..............\.......\package.html
..............\...............\...\....\....\...\.....\...\..............\.......\PasswordEncoder.java
..............\...............\...\....\....\...\.....\...\..............\.......\PlainTextPasswordEncoder.java
..............\...............\...\....\....\...\.....\...\..............\.......\support
..............\...............\...\....\....\...\.....\...\..............\.......\.......\AbstractPreAndPostProcessingAuthenticationHandler.java
..............\...............\...\....\....\...\.....\...\..............\.......\.......\AbstractUsernamePasswordAuthenticationHandler.java
..............\...............\...\....\....\...\.....\...\..............\.......\.......\HttpBasedServiceCredentialsAuthenticationHandler.java
..............\...............\...\....\....\...\.....\...\..............\.......\.......\JaasAuthenticationHandler.java
..............\...............\...\....\....\...\.....\...\..............\.......\.......\package.html
..............\...............\...\....\....\...\.....\...\..............\.......\.......\SimpleTestUsernamePasswordAuthenticationHandler.java
..............\...............\...\....\....\...\.....\...\..............\.......\UncategorizedAuthenticationException.java
..............\...............\...\....\....\...\.....\...\..............\.......\UnknownUsernameAuthenticationException.java
..............\...............\...\....\....\...\.....\...\..............\.......\UnsupportedCredentialsException.java
..............\...............\...\....\....\...\.....\...\..............\ImmutableAuthentication.java
..............\...............\...\....\....\...\.....\...\..............\MutableAuthentication.java
..............\...............\...\....\....\...\.....\...\..............\package.html
..............\...............\...\....\....\...\.....\...\..............\principal
..............\...............\...\....\....\...\.....\...\..............\.........\AbstractPersonDirectoryCredentialsToPrincipalResol

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