一、配置Centos 7 使用openldap服务作为认证源
1、安装openldap 客户端软件
[charles@node3 ~]$ yum install -y openldap-clients nss-pam-ldapd
一般来说直接配置了下述命令就可以直接使用相应的openldap 认证：
[root@localhost ~]# authconfig --enableldap --enableldapauth --enablemkhomedir --enableforcelegacy --disablesssd --disablesssdauth --disableldaptls --enablelocauthorize --ldapserver=192.168.11.231 --ldapbasedn="dc=ldaptest,dc=com,dc=cn" --enableshadow --update
一般配置完成后，还是按照下述步骤检测相关配置是否已经生成了。
2、nslcd配置文件
[root@localhost ~]# vim /etc/nslcd.conf
uri ldap://192.168.11.231/
base dc=ldaptest,dc=com,dc=cn
binddn uid=monitor,ou=people,dc=ldaptest,dc=com,dc=cn #若服务器开启了禁止匿名用户访问，需要在客户端配置具有读权限的账号和密码才能验证成功。
bindpw 123456 #同上
ssl no
tls_cacertdir /etc/openldap/cacerts
3、system-auth配置文件
[root@localhost ~]# vim /etc/pam.d/system-auth
auth required pam_env.so
auth sufficient pam_unix.so nullok try_first_pass
auth requisite pam_succeed_if.so uid >= 1000 quiet
auth sufficient pam_ldap.so use_first_pass #新增
auth required pam_deny.so
account required pam_unix.so
account sufficient pam_localuser.so
account sufficient pam_succeed_if.so uid < 1000 quiet
account [default=bad success=ok user_unknown=ignore] pam.ldap.so #新增
account required pam_permit.so
password requisite pam_cracklib.so try_first_pass retry=3 type=
password sufficient pam_unix.so sha512 shadow nullok try_first_pass use_authtok
password sufficient pam_ldap.so use_authtok #新增
password required pam_deny.so
session optional pam_keyinit.so revoke
session required pam_limits.so
session [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid
session optional pam_ldap.so #新增
session required pam_unix.so
4、nsswitch.conf 配置文件
[root@localhost ~]# vim /etc/nsswitch.conf
passwd: files ldap
shadow: files ldap
group: files ldap
5、authconfig配置文件
[root@localhost ~]# vim /etc/sysconfig/authconfig
USELOCAUTHORIZE=yes
USELDAPAUTH=yes
USELDAP=yes
USESHADOW=yes
6、配置客户端登录自动创建家目录
[root@localhost ~]# vim /etc/pam.d/system-auth
session optional pam_keyinit.so revoke
session required pam_limits.so
session [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid
session required pam_unix.so
session optional pam_ldap.so
#创建家目录的模块
session optional pam__mkhomedir.so skel=/etc/skel umask=077
[root@localhost ~]# vim /etc/pam.d/sshd
#%PAM-1.0
auth required pam_sepermit.so
auth include password-auth
account required pam_nologin.so
account include password-auth
password include password-auth
# pam_selinux.so close should be the first session rule
session required pam_selinux.so close
session required pam_loginuid.so
# pam_selinux.so open should only be followed by sessions to be executed in the user context
session required pam_selinux.so open env_params
session required pam_namespace.so
session optional pam_keyinit.so force revoke
session include password-auth
#添加模块
session required pam_mkhomedir.so
7、在Centos 7 客户端上配置相关的sudo配置
[root@localhost ~]# vim /etc/nsswitch.conf
#在文件末尾添加
sudoers: ldap files
[root@localhost ~]# vim /etc/sudo-ldap.conf
binddn uid=monitor,ou=people,dc=ldaptest,dc=com,dc=cn
bindpw 123456
uri ldap://192.168.11.231
#在文件末尾添加
sudoers_base ou=sudoers,dc=ldaptest,dc=com,dc=cn
配置完成后，可以使用指定用户登录客户端系统验证其对应的sudo权限，类似如下：
[charles@localhost ~]$ sudo -l
[sudo] password for charles:
Matching Defaults entries for charles on localhost:
requiretty, always_set_home, env_reset, env_keep="COLORS DISPLAY HOSTNAME HISTSIZE INPUTRC KDEDIR LS_COLORS",
env_keep+="MAIL PS1 PS2 QTDIR USERNAME LANG LC_ADDRESS LC_CTYPE", env_keep+="LC_COLLATE LC_IDENTIFICATION
LC_MEASUREMENT LC_MESSAGES", env_keep+="LC_MONETARY LC_NAME LC_NUMBERIC LC_PAPER LC_TELEPHONE", env_keep+="LC_TIME
LC_ALL LANGUAGE LINGUAS _XKB_CHARSET XAUTHORITY", secure_path=/sbin:/bin:/usr/sbin/:/usr/bin, !visiblepw,
always_set_home, match_group_by_gid, env_reset, env_keep="COLORS DISPLAY HOSTNAME HISTSIZE KDEDIR LS_COLORS",
env_keep+="MAIL PS1 PS2 QTDIR USERNAME LANG LC_ADDRESS LC_CTYPE", env_keep+="LC_COLLATE LC_IDENTIFICATION
LC_MEASUREMENT LC_MESSAGES", env_keep+="LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER LC_TELEPHONE", env_keep+="LC_TIME
LC_ALL LANGUAGE LINGUAS _XKB_CHARSET XAUTHORITY", secure_path=/sbin\:/bin\:/usr/sbin\:/usr/bin
User charles may run the following commands on localhost:
(root) PASSWD: /bin/rm, /bin/rmdir, /bin/chmod, /bin/chown, /bin/dd, /bin/mv, /bin/cp, /sbin/fsck*, /sbin/*remove,
/usr/bin/chattr, /sbin/mkfs*, !/usr/bin/passwd
8、限制主机登录用户
[root@localhost ~]# vim /etc/nslcd.conf
#在文件末尾添加下述命令语句,此语句表示仅匹配gidNumber为50896的用户进行登录认证
filter passwd (gidNumber=50896)
[root@localhost ~]# systemctl restart nslcd
9、启动nslcd服务
[root@localhost ~]# systemctl restart nslcd
[root@localhost ~]# systemctl restart sshd
可通过下述命令，获取openldap认证用户的相关信息的话，说明配置成功。
[root@localhost ~]# getent passwd charles
charles:x:1000:1000:charles:/home/charles:/bin/bash
初次使用openldap认证用户登录系统时，系统会自动创建改用户的家目录。
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