08.ldap网络帐号

1.ldap是什么
ldap目录服务认证，和windows活动目录类似，就是记录数据的一种方式

2.ldap客户端所须软件
yum sssd krb5-workstation -y

3.如何开启ldap用户认证
authconfig-tui

┌────────────────┤ Authentication Configuration ├─────────────────┐
│ │
│ User Information Authentication │
│ [ ] Cache Information [ ] Use MD5 Passwords │
│ [] Use LDAP [] Use Shadow Passwords │
│ [ ] Use NIS [ ] Use LDAP Authentication │
│ [ ] Use IPAv2 [*] Use Kerberos │
│ [ ] Use Winbind [ ] Use Fingerprint reader │
│ [ ] Use Winbind Authentication │
│ [*] Local authorization is sufficient │
│ │
│ ┌────────┐ ┌──────┐ │
│ │ Cancel │ │ Next │ │
│ └────────┘ └──────┘ │
│ │
│ │
└─────────────────────────────────────────────────────────────────┘

┌─────────────────┤ LDAP Settings ├─────────────────┐
│ │
│ [*] Use TLS │
│ Server: ldap://classroom.example.com/_ │
│ Base DN: dc=example,dc=com_______________________ │
│ │
│ ┌──────┐ ┌──────┐ │
│ │ Back │ │ Next │ │
│ └──────┘ └──────┘ │
│ │
│ │
└───────────────────────────────────────────────────┘

┌─────────────────┤ Kerberos Settings ├──────────────────┐
│ │
│ Realm: EXAMPLE.COM_____________________________ │
│ KDC: classroom.example.com___________________ │
│ Admin Server: classroom.example.com___________________ │
│ [ ] Use DNS to resolve hosts to realms │
│ [ ] Use DNS to locate KDCs for realms │
│ │
│ ┌──────┐ ┌────┐ │
│ │ Back │ │ Ok │ │
│ └──────┘ └────┘ │
│ │
│ │
└────────────────────────────────────────────────────────┘

<当出现以下报错时>

┌────────────────┤ Warning ├─────────────────┐
│ │
│ To connect to a LDAP server with TLS │
│ protocol enabled you need a CA certificate │
│ which signed your server’s certificate. │
│ Copy the certificate in the PEM format to │
│ the ‘/etc/openldap/cacerts’ directory. │
│ Then press OK. │
│ │
│ ┌────┐ │
│ │ Ok │ │
│ └────┘ │
│ │
│ │
└────────────────────────────────────────────┘

时因为tls的证书缺失，需要到服务器端下载所需要的证书到/etc/openldap/cacerts，
用到的命令
wget http://172.25.254.254/pub/example-ca.crt

<测试>
getent passwd ldapuser1
如果用户信息可以正常显示，证明客户端认成功。

列出所有用户
vim /etc/sssd/sssd.conf
enumerate = True
systemctl restart sssd

4.自动挂载用户家目录
yum install autofs -y
vim /etc/autofs.master
/home/guests /etc/auto.ldap

vim /etc/auto.ldap
ldapuser1 172.25.254.254:/home/guests/ldapuser1
+++++++++++++++++++++++++++++++++++++++++++++++++++++++
* 172.25.254.254:/home/guests/&

systemctl restart autofs
systemctl enable autofs