{"id":457,"date":"2018-03-07T02:48:40","date_gmt":"2018-03-07T08:48:40","guid":{"rendered":"https:\/\/linuxhostsupport.com\/blog\/?p=457"},"modified":"2020-08-02T11:53:42","modified_gmt":"2020-08-02T16:53:42","slug":"how-to-install-ldap-on-centos-7","status":"publish","type":"post","link":"https:\/\/linuxhostsupport.com\/blog\/how-to-install-ldap-on-centos-7\/","title":{"rendered":"How to Install LDAP on CentOS 7"},"content":{"rendered":"
\"\"<\/a><\/div>

Today, we will show you, How to install LDAP on CentOS 7. LDAP, or Lightweight Directory Access Protocol, is an open, vendor-neutral, industry standard application protocol for accessing and maintaining distributed directory information services over an Internet Protocol (IP) network. It can be used to store any kind of information and it is often used as one component of a centralized authentication system. Installing and configuring an OpenLDAP server on CentOS 7, it’s fairly easy task, just carefully follow the tutorial below and you should have it installed in less than 10 minutes.<\/p>\n

<\/p>\n

Update the system<\/h2>\n

As usual before installing new software, update all your system packages to the newest available version first:<\/p>\n

# yum update<\/pre>\n
Install OpenLDAP<\/h2>\n
We are going to begin by installing the packages required for OpenLDAP functionality:<\/p>\n
# yum -y install openldap compat-openldap openldap-clients openldap-servers openldap-servers-sql openldap-devel<\/pre>\n
We will also start the LDAP daemon and enable it on boot:<\/p>\n
# systemctl start slapd.service\r\n# systemctl enable slapd.service<\/pre>\n
Run the slappasswd command to set a LDAP root password and save the output because we are going to need it to configure OpenLDAP:<\/p>\n
# slappasswd<\/pre>\n
We’ll configure the OpenLDAP server now. We’ll create a few LDIF files and then we will use the ldapmodify command to deploy the configuration to the server. The files will be stored in ‘\/etc\/openldap\/slapd.d’ and they shouldn’t be edited manually.<\/p>\n
The ‘db.ldif’ file will update the olcSuffix variable which will add the distinguished name to queries that will be passed to the backend database, it will configure the domain name for which your LDAP server will provide account information, and it will update the olcRootDN variable which specifies the root distinguished name user that will have administrator access to the LDAP server.<\/p>\n
Our domain is field.linuxhostsupport.com, and written inside the ‘db.ldif’ file it looks like this ‘dc=field,dc=linuxhostsupport,dc=com’ and our root distinguished name is ‘cn=ldapadm,dc=field,dc=linuxhostsupport,dc=com’.<\/p>\n
Configure OpenLDAP<\/h2>\n
Create the db.ldif file using nano or an editor of your preference and paste the following content in:<\/p>\n
# nano db.ldif\r\n\r\ndn: olcDatabase={2}hdb,cn=config\r\nchangetype: modify\r\nreplace: olcSuffix\r\nolcSuffix: dc=field,dc=linuxhostsupport,dc=com\r\n \r\ndn: olcDatabase={2}hdb,cn=config\r\nchangetype: modify\r\nreplace: olcRootDN\r\nolcRootDN: cn=ldapadm,dc=field,dc=linuxhostsupport,dc=com\r\n \r\ndn: olcDatabase={2}hdb,cn=config\r\nchangetype: modify\r\nreplace: olcRootPW\r\nolcRootPW: hashed_output_from_the_slappasswd_command\r\n<\/pre>\n
Deploy the configuration using ldapmodify:<\/p>\n
# ldapmodify -Y EXTERNAL -H ldapi:\/\/\/ -f db.ldif\r\n<\/pre>\n
Now restrict monitor access only to the ldapadm user:<\/p>\n
# nano monitor.ldif\r\n\r\ndn: olcDatabase={1}monitor,cn=config\r\nchangetype: modify\r\nreplace: olcAccess\r\nolcAccess: {0}to * by dn.base=\"gidNumber=0+uidNumber=0,cn=peercred,cn=external, cn=auth\" read by dn.base=\"cn=ldapadm,dc=field,dc=linuxhostsupport,dc=com\" read by * none\r\n<\/pre>\n
Deploy the configuration change again:<\/p>\n
# ldapmodify -Y EXTERNAL -H ldapi:\/\/\/ -f monitor.ldif\r\n<\/pre>\n
Now we will generate a certificate and a private key so we can communicate securely with the OpenLDAP server. We will use the command below to do that:<\/p>\n
openssl req -new -x509 -nodes -out \\\r\n\/etc\/openldap\/certs\/myldap.field.linuxhostsupport.com.cert \\\r\n-keyout \/etc\/openldap\/certs\/myldap.field.linuxhostsupport.com.key \\\r\n-days 365\r\n<\/pre>\n
Change the owner and group permissions so OpenLDAP can read the files:<\/p>\n
# chown -R ldap:ldap \/etc\/openldap\/certs<\/pre>\n
Now create certs.ldif to configure OpenLDAP to use the LDAPS protocol:<\/p>\n
# nano certs.ldif\r\n\r\ndn: cn=config\r\nchangetype: modify\r\nreplace: olcTLSCertificateFile\r\nolcTLSCertificateFile: \/etc\/openldap\/certs\/myldap.field.linuxhostsupport.com.cert\r\n\r\ndn: cn=config\r\nchangetype: modify\r\nreplace: olcTLSCertificateKeyFile\r\nolcTLSCertificateKeyFile: \/etc\/openldap\/certs\/myldap.field.linuxhostsupport.com.key\r\n<\/pre>\n
We can then deploy the configuration again:<\/p>\n
# ldapmodify -Y EXTERNAL -H ldapi:\/\/\/ -f certs.ldif<\/pre>\n
Now test the configuration using the following command:<\/p>\n
# slaptest -u<\/pre>\n
Setting up the OpenLDAP database<\/h2>\n
Now we can set up the LDAP database, start by copying the sample database configuration file to ‘\/var\/lib\/ldap’ and change the file permissions:<\/p>\n
# cp \/usr\/share\/openldap-servers\/DB_CONFIG.example \/var\/lib\/ldap\/DB_CONFIG\r\n# chown -R ldap:ldap \/var\/lib\/ldap<\/pre>\n
Add the LDAP schemas:<\/p>\n
# ldapadd -Y EXTERNAL -H ldapi:\/\/\/ -f \/etc\/openldap\/schema\/cosine.ldif\r\n# ldapadd -Y EXTERNAL -H ldapi:\/\/\/ -f \/etc\/openldap\/schema\/nis.ldif\r\n# ldapadd -Y EXTERNAL -H ldapi:\/\/\/ -f \/etc\/openldap\/schema\/inetorgperson.ldif<\/pre>\n
And now create a base.ldif file for your domain:<\/p>\n
# nano base.ldif\r\n\r\ndn: dc=field,dc=linuxhostsupport,dc=com\r\ndc: field\r\nobjectClass: top\r\nobjectClass: domain\r\n\r\ndn: cn=ldapadm,dc=field,dc=linuxhostsupport,dc=com\r\nobjectClass: organizationalRole\r\ncn: ldapadm\r\ndescription: LDAP Manager\r\n\r\ndn: ou=People,dc=field,dc=linuxhostsupport,dc=com\r\nobjectClass: organizationalUnit\r\nou: People\r\n\r\ndn: ou=Group,dc=field,dc=linuxhostsupport,dc=com\r\nobjectClass: organizationalUnit\r\nou: Group\r\n<\/pre>\n
We will deploy these configuration changes to the OpenLDAP server using the ldapadm user:<\/p>\n
# ldapadd -x -W -D \"cn=ldapadm,dc=field,dc=linuxhostsupport,dc=com\" -f base.ldif\r\n<\/pre>\n
Enter the root password when prompted.<\/p>\n
If you need to add users it’s easier to add them with a GUI, we recommend using Apache Directory Studio or JXplorer for this.<\/p>\n
That’s it you should now have successfully installed LDAP on CentOS 7.<\/p>\n
 <\/p>\n
Of course you don\u2019t have to install LDAP on CentOS 7, if you use one of our Linux server support services<\/a>, in which case you can simply ask our expert Linux admins to configure this for you. They are available 24\u00d77 and will take care of your request immediately.<\/p>\n
PS<\/span><\/strong>. If you liked this post,\u00a0 on how to install LDAP on CentOS 7, please share it with your friends on the social networks using the buttons on the left or simply leave a reply below. Thanks.<\/p>
\"\"<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"
Today, we will show you, How to install LDAP on CentOS 7. LDAP, or Lightweight Directory Access Protocol, is an open, vendor-neutral, industry standard application protocol for accessing and maintaining distributed directory information services over an Internet Protocol (IP) network. It can be used to store any kind of information and it is often used […]<\/p>\n","protected":false},"author":1,"featured_media":458,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[61,85],"class_list":["post-457","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutorials","tag-centos-7","tag-ldap"],"yoast_head":"\nHow to Install LDAP on CentOS 7 | LinuxHostSupport<\/title>\n<meta name=\"description\" content=\"Today, we will show you, How to install LDAP on CentOS 7. 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