Fix DefaultLdapAuthoritiesPopulator NPE

Closes gh-12090

Author: dkodippily

ldap/src/integration-test/java/org/springframework/security/ldap/userdetails/DefaultLdapAuthoritiesPopulatorGetGrantedAuthoritiesTests.java

@@ -0,0 +1,105 @@
+/*
+ * Copyright 2002-2022 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
+ *
+ *      https://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.userdetails;
+
+import java.util.Set;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+
+import org.springframework.beans.factory.DisposableBean;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.ldap.core.ContextSource;
+import org.springframework.ldap.core.DirContextAdapter;
+import org.springframework.ldap.core.DistinguishedName;
+import org.springframework.security.core.authority.AuthorityUtils;
+import org.springframework.security.ldap.DefaultSpringSecurityContextSource;
+import org.springframework.security.ldap.server.ApacheDSContainer;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Dayan Kodippily
+ */
+@ExtendWith(SpringExtension.class)
+@ContextConfiguration(
+		classes = DefaultLdapAuthoritiesPopulatorGetGrantedAuthoritiesTests.ApacheDsContainerWithUndefinedGroupRoleAttributeConfig.class)
+public class DefaultLdapAuthoritiesPopulatorGetGrantedAuthoritiesTests {
+
+	@Autowired
+	private DefaultSpringSecurityContextSource contextSource;
+
+	private DefaultLdapAuthoritiesPopulator populator;
+
+	@BeforeEach
+	public void setUp() {
+		this.populator = new DefaultLdapAuthoritiesPopulator(this.contextSource, "ou=groups");
+		this.populator.setIgnorePartialResultException(false);
+	}
+
+	@Test
+	public void groupSearchDoesNotAllowNullRoles() {
+		this.populator.setRolePrefix("ROLE_");
+		this.populator.setGroupRoleAttribute("ou");
+		this.populator.setSearchSubtree(true);
+		this.populator.setSearchSubtree(false);
+		this.populator.setConvertToUpperCase(true);
+		this.populator.setGroupSearchFilter("(member={0})");
+
+		DirContextAdapter ctx = new DirContextAdapter(
+				new DistinguishedName("uid=dayan,ou=people,dc=springframework,dc=org"));
+
+		Set<String> authorities = AuthorityUtils.authorityListToSet(this.populator.getGrantedAuthorities(ctx, "dayan"));
+
+		assertThat(authorities).as("Should have 1 role").hasSize(2);
+
+		assertThat(authorities.contains("ROLE_DEVELOPER")).isTrue();
+		assertThat(authorities.contains("ROLE_")).isTrue();
+	}
+
+	@Configuration
+	static class ApacheDsContainerWithUndefinedGroupRoleAttributeConfig implements DisposableBean {
+
+		private ApacheDSContainer container;
+
+		@Bean
+		ApacheDSContainer ldapContainer() throws Exception {
+			this.container = new ApacheDSContainer("dc=springframework,dc=org",
+					"classpath:test-server-with-undefined-group-role-attributes.ldif");
+			this.container.setPort(0);
+			return this.container;
+		}
+
+		@Bean
+		ContextSource contextSource(ApacheDSContainer ldapContainer) {
+			return new DefaultSpringSecurityContextSource(
+					"ldap://127.0.0.1:" + ldapContainer.getLocalPort() + "/dc=springframework,dc=org");
+		}
+
+		@Override
+		public void destroy() {
+			this.container.stop();
+		}
+
+	}
+
+}

ldap/src/integration-test/resources/test-server-with-undefined-group-role-attributes.ldif

@@ -0,0 +1,41 @@
+dn: ou=groups,dc=springframework,dc=org
+objectclass: top
+objectclass: organizationalUnit
+ou: groups
+
+dn: ou=people,dc=springframework,dc=org
+objectclass: top
+objectclass: organizationalUnit
+ou: people
+
+dn: uid=dayan,ou=people,dc=springframework,dc=org
+objectclass: top
+objectclass: person
+objectclass: organizationalPerson
+objectclass: inetOrgPerson
+cn: Dayan K
+sn: Dayan
+uid: dayan
+userPassword: dayanspassword
+
+
+
+dn: cn=managers,ou=groups,dc=springframework,dc=org
+objectclass: top
+objectclass: groupOfNames
+cn: managers
+ou:
+member: uid=dayan,ou=people,dc=springframework,dc=org
+
+dn: cn=researchers,ou=groups,dc=springframework,dc=org
+objectclass: top
+objectclass: groupOfNames
+cn: researchers
+member: uid=dayan,ou=people,dc=springframework,dc=org
+
+dn: cn=developers,ou=groups,dc=springframework,dc=org
+objectclass: top
+objectclass: groupOfNames
+cn: developers
+ou: developer
+member: uid=dayan,ou=people,dc=springframework,dc=org

ldap/src/main/java/org/springframework/security/ldap/userdetails/DefaultLdapAuthoritiesPopulator.java

@@ -37,6 +37,7 @@
 import org.springframework.security.core.authority.SimpleGrantedAuthority;
 import org.springframework.security.ldap.SpringSecurityLdapTemplate;
 import org.springframework.util.Assert;
+import org.springframework.util.CollectionUtils;
 
 /**
  * The default strategy for obtaining user role information from the directory.
@@ -169,7 +170,14 @@ else if (groupSearchBase.length() == 0) {
 			logger.info("Will perform group search from the context source base since groupSearchBase is empty.");
 		}
 		this.authorityMapper = (record) -> {
-			String role = record.get(this.groupRoleAttribute).get(0);
+			List<String> roles = record.get(this.groupRoleAttribute);
+			if (CollectionUtils.isEmpty(roles)) {
+				return null;
+			}
+			String role = roles.get(0);
+			if (role == null) {
+				return null;
+			}
 			if (this.convertToUpperCase) {
 				role = role.toUpperCase();
 			}
@@ -225,7 +233,10 @@ public Set<GrantedAuthority> getGroupMembershipRoles(String userDn, String usern
 				new String[] { this.groupRoleAttribute });
 		logger.debug(LogMessage.of(() -> "Found roles from search " + userRoles));
 		for (Map<String, List<String>> role : userRoles) {
-			authorities.add(this.authorityMapper.apply(role));
+			GrantedAuthority authority = this.authorityMapper.apply(role);
+			if (authority != null) {
+				authorities.add(authority);
+			}
 		}
 		return authorities;
 	}