/*
 * Copyright 2002-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.security.ldap.authentication.ad;

import org.apache.directory.shared.ldap.util.EmptyEnumeration;
import org.hamcrest.BaseMatcher;
import org.hamcrest.CoreMatchers;
import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.mockito.ArgumentCaptor;
import org.springframework.dao.IncorrectResultSizeDataAccessException;
import org.springframework.ldap.core.DirContextAdapter;
import org.springframework.ldap.core.DistinguishedName;
import org.springframework.security.authentication.AccountExpiredException;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.authentication.CredentialsExpiredException;
import org.springframework.security.authentication.DisabledException;
import org.springframework.security.authentication.LockedException;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;

import javax.naming.AuthenticationException;
import javax.naming.CommunicationException;
import javax.naming.Name;
import javax.naming.NameNotFoundException;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.DirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;

import java.util.Hashtable;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.fail;
import static org.mockito.Mockito.*;
import static org.springframework.security.ldap.authentication.ad.ActiveDirectoryLdapAuthenticationProvider.ContextFactory;

/**
 * @author Luke Taylor
 * @author Rob Winch
 */
public class ActiveDirectoryLdapAuthenticationProviderTests {
	@Rule
	public ExpectedException thrown = ExpectedException.none();

	ActiveDirectoryLdapAuthenticationProvider provider;
	UsernamePasswordAuthenticationToken joe = new UsernamePasswordAuthenticationToken(
			"joe", "password");

	@Before
	public void setUp() throws Exception {
		provider = new ActiveDirectoryLdapAuthenticationProvider("mydomain.eu",
				"ldap://192.168.1.200/");
	}

	@Test
	public void bindPrincipalIsCreatedCorrectly() throws Exception {
		assertThat(provider.createBindPrincipal("joe")).isEqualTo("joe@mydomain.eu");
		assertThat(provider.createBindPrincipal("joe@mydomain.eu")).isEqualTo("joe@mydomain.eu");
	}

	@Test
	public void successfulAuthenticationProducesExpectedAuthorities() throws Exception {
		checkAuthentication("dc=mydomain,dc=eu", provider);
	}

	// SEC-1915
	@Test
	public void customSearchFilterIsUsedForSuccessfulAuthentication() throws Exception {
		// given
		String customSearchFilter = "(&(objectClass=user)(sAMAccountName={0}))";

		DirContext ctx = mock(DirContext.class);
		when(ctx.getNameInNamespace()).thenReturn("");

		DirContextAdapter dca = new DirContextAdapter();
		SearchResult sr = new SearchResult("CN=Joe Jannsen,CN=Users", dca,
				dca.getAttributes());
		when(
				ctx.search(any(Name.class), eq(customSearchFilter), any(Object[].class),
						any(SearchControls.class))).thenReturn(
				new MockNamingEnumeration(sr));

		ActiveDirectoryLdapAuthenticationProvider customProvider = new ActiveDirectoryLdapAuthenticationProvider(
				"mydomain.eu", "ldap://192.168.1.200/");
		customProvider.contextFactory = createContextFactoryReturning(ctx);

		// when
		customProvider.setSearchFilter(customSearchFilter);
		Authentication result = customProvider.authenticate(joe);

		// then
		assertThat(result.isAuthenticated()).isTrue();
	}

	@Test
	public void defaultSearchFilter() throws Exception {
		// given
		final String defaultSearchFilter = "(&(objectClass=user)(userPrincipalName={0}))";

		DirContext ctx = mock(DirContext.class);
		when(ctx.getNameInNamespace()).thenReturn("");

		DirContextAdapter dca = new DirContextAdapter();
		SearchResult sr = new SearchResult("CN=Joe Jannsen,CN=Users", dca,
				dca.getAttributes());
		when(
				ctx.search(any(Name.class), eq(defaultSearchFilter), any(Object[].class),
						any(SearchControls.class))).thenReturn(
				new MockNamingEnumeration(sr));

		ActiveDirectoryLdapAuthenticationProvider customProvider = new ActiveDirectoryLdapAuthenticationProvider(
				"mydomain.eu", "ldap://192.168.1.200/");
		customProvider.contextFactory = createContextFactoryReturning(ctx);

		// when
		Authentication result = customProvider.authenticate(joe);

		// then
		assertThat(result.isAuthenticated()).isTrue();
		verify(ctx).search(any(DistinguishedName.class), eq(defaultSearchFilter),
				any(Object[].class), any(SearchControls.class));
	}

	// SEC-2897,SEC-2224
	@Test
	public void bindPrincipalAndUsernameUsed() throws Exception {
		// given
		final String defaultSearchFilter = "(&(objectClass=user)(userPrincipalName={0}))";
		ArgumentCaptor<Object[]> captor = ArgumentCaptor.forClass(Object[].class);

		DirContext ctx = mock(DirContext.class);
		when(ctx.getNameInNamespace()).thenReturn("");

		DirContextAdapter dca = new DirContextAdapter();
		SearchResult sr = new SearchResult("CN=Joe Jannsen,CN=Users", dca,
				dca.getAttributes());
		when(
				ctx.search(any(Name.class), eq(defaultSearchFilter), captor.capture(),
						any(SearchControls.class))).thenReturn(
				new MockNamingEnumeration(sr));

		ActiveDirectoryLdapAuthenticationProvider customProvider = new ActiveDirectoryLdapAuthenticationProvider(
				"mydomain.eu", "ldap://192.168.1.200/");
		customProvider.contextFactory = createContextFactoryReturning(ctx);

		// when
		Authentication result = customProvider.authenticate(joe);

		// then
		assertThat(captor.getValue()).containsExactly("joe@mydomain.eu", "joe");
		assertThat(result.isAuthenticated()).isTrue();
	}

	@Test(expected = IllegalArgumentException.class)
	public void setSearchFilterNull() {
		provider.setSearchFilter(null);
	}

	@Test(expected = IllegalArgumentException.class)
	public void setSearchFilterEmpty() {
		provider.setSearchFilter(" ");
	}

	@Test
	public void nullDomainIsSupportedIfAuthenticatingWithFullUserPrincipal()
			throws Exception {
		provider = new ActiveDirectoryLdapAuthenticationProvider(null,
				"ldap://192.168.1.200/");
		DirContext ctx = mock(DirContext.class);
		when(ctx.getNameInNamespace()).thenReturn("");

		DirContextAdapter dca = new DirContextAdapter();
		SearchResult sr = new SearchResult("CN=Joe Jannsen,CN=Users", dca,
				dca.getAttributes());
		when(
				ctx.search(eq(new DistinguishedName("DC=mydomain,DC=eu")),
						any(String.class), any(Object[].class), any(SearchControls.class)))
				.thenReturn(new MockNamingEnumeration(sr));
		provider.contextFactory = createContextFactoryReturning(ctx);

		try {
			provider.authenticate(joe);
			fail("Expected BadCredentialsException for user with no domain information");
		}
		catch (BadCredentialsException expected) {
		}

		provider.authenticate(new UsernamePasswordAuthenticationToken("joe@mydomain.eu",
				"password"));
	}

	@Test(expected = BadCredentialsException.class)
	public void failedUserSearchCausesBadCredentials() throws Exception {
		DirContext ctx = mock(DirContext.class);
		when(ctx.getNameInNamespace()).thenReturn("");
		when(
				ctx.search(any(Name.class), any(String.class), any(Object[].class),
						any(SearchControls.class)))
				.thenThrow(new NameNotFoundException());

		provider.contextFactory = createContextFactoryReturning(ctx);

		provider.authenticate(joe);
	}

	// SEC-2017
	@Test(expected = BadCredentialsException.class)
	public void noUserSearchCausesUsernameNotFound() throws Exception {
		DirContext ctx = mock(DirContext.class);
		when(ctx.getNameInNamespace()).thenReturn("");
		when(
				ctx.search(any(Name.class), any(String.class), any(Object[].class),
						any(SearchControls.class))).thenReturn(
				new EmptyEnumeration<SearchResult>());

		provider.contextFactory = createContextFactoryReturning(ctx);

		provider.authenticate(joe);
	}

	// SEC-2500
	@Test(expected = BadCredentialsException.class)
	public void sec2500PreventAnonymousBind() {
		provider.authenticate(new UsernamePasswordAuthenticationToken("rwinch", ""));
	}

	@SuppressWarnings("unchecked")
	@Test(expected = IncorrectResultSizeDataAccessException.class)
	public void duplicateUserSearchCausesError() throws Exception {
		DirContext ctx = mock(DirContext.class);
		when(ctx.getNameInNamespace()).thenReturn("");
		NamingEnumeration<SearchResult> searchResults = mock(NamingEnumeration.class);
		when(searchResults.hasMore()).thenReturn(true, true, false);
		SearchResult searchResult = mock(SearchResult.class);
		when(searchResult.getObject()).thenReturn(new DirContextAdapter("ou=1"),
				new DirContextAdapter("ou=2"));
		when(searchResults.next()).thenReturn(searchResult);
		when(
				ctx.search(any(Name.class), any(String.class), any(Object[].class),
						any(SearchControls.class))).thenReturn(searchResults);

		provider.contextFactory = createContextFactoryReturning(ctx);

		provider.authenticate(joe);
	}

	static final String msg = "[LDAP: error code 49 - 80858585: LdapErr: DSID-DECAFF0, comment: AcceptSecurityContext error, data ";

	@Test(expected = BadCredentialsException.class)
	public void userNotFoundIsCorrectlyMapped() {
		provider.contextFactory = createContextFactoryThrowing(new AuthenticationException(
				msg + "525, xxxx]"));
		provider.setConvertSubErrorCodesToExceptions(true);
		provider.authenticate(joe);
	}

	@Test(expected = BadCredentialsException.class)
	public void incorrectPasswordIsCorrectlyMapped() {
		provider.contextFactory = createContextFactoryThrowing(new AuthenticationException(
				msg + "52e, xxxx]"));
		provider.setConvertSubErrorCodesToExceptions(true);
		provider.authenticate(joe);
	}

	@Test(expected = BadCredentialsException.class)
	public void notPermittedIsCorrectlyMapped() {
		provider.contextFactory = createContextFactoryThrowing(new AuthenticationException(
				msg + "530, xxxx]"));
		provider.setConvertSubErrorCodesToExceptions(true);
		provider.authenticate(joe);
	}

	@Test
	public void passwordNeedsResetIsCorrectlyMapped() {
		final String dataCode = "773";
		provider.contextFactory = createContextFactoryThrowing(new AuthenticationException(
				msg + dataCode + ", xxxx]"));
		provider.setConvertSubErrorCodesToExceptions(true);

		thrown.expect(BadCredentialsException.class);
		thrown.expect(new BaseMatcher<BadCredentialsException>() {
			private Matcher<Object> causeInstance = CoreMatchers
					.instanceOf(ActiveDirectoryAuthenticationException.class);
			private Matcher<String> causeDataCode = CoreMatchers.equalTo(dataCode);

			public boolean matches(Object that) {
				Throwable t = (Throwable) that;
				ActiveDirectoryAuthenticationException cause = (ActiveDirectoryAuthenticationException) t
						.getCause();
				return causeInstance.matches(cause)
						&& causeDataCode.matches(cause.getDataCode());
			}

			public void describeTo(Description desc) {
				desc.appendText("getCause() ");
				causeInstance.describeTo(desc);
				desc.appendText("getCause().getDataCode() ");
				causeDataCode.describeTo(desc);
			}
		});

		provider.authenticate(joe);
	}

	@Test(expected = CredentialsExpiredException.class)
	public void expiredPasswordIsCorrectlyMapped() {
		provider.contextFactory = createContextFactoryThrowing(new AuthenticationException(
				msg + "532, xxxx]"));

		try {
			provider.authenticate(joe);
			fail("BadCredentialsException should had been thrown");
		}
		catch (BadCredentialsException expected) {
		}

		provider.setConvertSubErrorCodesToExceptions(true);
		provider.authenticate(joe);
	}

	@Test(expected = DisabledException.class)
	public void accountDisabledIsCorrectlyMapped() {
		provider.contextFactory = createContextFactoryThrowing(new AuthenticationException(
				msg + "533, xxxx]"));
		provider.setConvertSubErrorCodesToExceptions(true);
		provider.authenticate(joe);
	}

	@Test(expected = AccountExpiredException.class)
	public void accountExpiredIsCorrectlyMapped() {
		provider.contextFactory = createContextFactoryThrowing(new AuthenticationException(
				msg + "701, xxxx]"));
		provider.setConvertSubErrorCodesToExceptions(true);
		provider.authenticate(joe);
	}

	@Test(expected = LockedException.class)
	public void accountLockedIsCorrectlyMapped() {
		provider.contextFactory = createContextFactoryThrowing(new AuthenticationException(
				msg + "775, xxxx]"));
		provider.setConvertSubErrorCodesToExceptions(true);
		provider.authenticate(joe);
	}

	@Test(expected = BadCredentialsException.class)
	public void unknownErrorCodeIsCorrectlyMapped() {
		provider.contextFactory = createContextFactoryThrowing(new AuthenticationException(
				msg + "999, xxxx]"));
		provider.setConvertSubErrorCodesToExceptions(true);
		provider.authenticate(joe);
	}

	@Test(expected = BadCredentialsException.class)
	public void errorWithNoSubcodeIsHandledCleanly() throws Exception {
		provider.contextFactory = createContextFactoryThrowing(new AuthenticationException(
				msg));
		provider.setConvertSubErrorCodesToExceptions(true);
		provider.authenticate(joe);
	}

	@Test(expected = org.springframework.ldap.CommunicationException.class)
	public void nonAuthenticationExceptionIsConvertedToSpringLdapException()
			throws Exception {
		provider.contextFactory = createContextFactoryThrowing(new CommunicationException(
				msg));
		provider.authenticate(joe);
	}

	@Test
	public void rootDnProvidedSeparatelyFromDomainAlsoWorks() throws Exception {
		ActiveDirectoryLdapAuthenticationProvider provider = new ActiveDirectoryLdapAuthenticationProvider(
				"mydomain.eu", "ldap://192.168.1.200/", "dc=ad,dc=eu,dc=mydomain");
		checkAuthentication("dc=ad,dc=eu,dc=mydomain", provider);

	}

	ContextFactory createContextFactoryThrowing(final NamingException e) {
		return new ContextFactory() {
			@Override
			DirContext createContext(Hashtable<?, ?> env) throws NamingException {
				throw e;
			}
		};
	}

	ContextFactory createContextFactoryReturning(final DirContext ctx) {
		return new ContextFactory() {
			@Override
			DirContext createContext(Hashtable<?, ?> env) throws NamingException {
				return ctx;
			}
		};
	}

	private void checkAuthentication(String rootDn,
			ActiveDirectoryLdapAuthenticationProvider provider) throws NamingException {
		DirContext ctx = mock(DirContext.class);
		when(ctx.getNameInNamespace()).thenReturn("");

		DirContextAdapter dca = new DirContextAdapter();
		SearchResult sr = new SearchResult("CN=Joe Jannsen,CN=Users", dca,
				dca.getAttributes());
		@SuppressWarnings("deprecation")
		DistinguishedName searchBaseDn = new DistinguishedName(rootDn);
		when(
				ctx.search(eq(searchBaseDn), any(String.class), any(Object[].class),
						any(SearchControls.class))).thenReturn(
				new MockNamingEnumeration(sr)).thenReturn(new MockNamingEnumeration(sr));

		provider.contextFactory = createContextFactoryReturning(ctx);

		Authentication result = provider.authenticate(joe);

		assertThat(result.getAuthorities()).isEmpty();

		dca.addAttributeValue("memberOf", "CN=Admin,CN=Users,DC=mydomain,DC=eu");

		result = provider.authenticate(joe);

		assertThat(result.getAuthorities()).hasSize(1);
	}

	static class MockNamingEnumeration implements NamingEnumeration<SearchResult> {
		private SearchResult sr;

		public MockNamingEnumeration(SearchResult sr) {
			this.sr = sr;
		}

		public SearchResult next() {
			SearchResult result = sr;
			sr = null;
			return result;
		}

		public boolean hasMore() {
			return sr != null;
		}

		public void close() {
		}

		public boolean hasMoreElements() {
			return hasMore();
		}

		public SearchResult nextElement() {
			return next();
		}
	}
}
