1安装软件：
yum install freeradius freeradius-ldap freeradius-utils -y

2启动服务
systemctl start radiusd.service
3开机自动启动
systemctl enable radiusd.service

4修改配置文件 /etc/raddb/mods-available/ldap主要是ldap部分，其它都是默认
[root@10-57-22-55 mods-available]# cat /etc/raddb/mods-available/ldap | grep -v '#' | grep -v ^$

ldap {
        server = 'x.x.8.55'   #服务器
        port = 389   #端口
        identity = 'CN=opsldap,CN=Users,DC=txxxdxx,DC=me'  #连接LDAP帐号
        password =xxxxxxxx   #连接LDAP密码
        base_dn = 'DC=txxxdxx,DC=me'   #dn
        sasl {
        }
        update {
                control:Password-With-Header    += 'userPassword'
                control:                        += 'radiusControlAttribute'
                request:                        += 'radiusRequestAttribute'
                reply:                          += 'radiusReplyAttribute'
        }
        edir = no   #修改
        user {
                base_dn = "${..base_dn}"
                filter = "(sAMAccountName=%{%{Stripped-User-Name}:-%{User-Name}})"     #修改成sAM
#以下用默认
                sasl {
                }
        }
        group {
                base_dn = "${..base_dn}"
                filter = '(objectClass=posixGroup)'
                membership_attribute = 'memberOf'
        }
        profile {
        }
        client {
                base_dn = "${..base_dn}"
                filter = '(objectClass=radiusClient)'
                template {
                }
                attribute {
                        ipaddr                          = 'radiusClientIdentifier'
                        secret                          = 'radiusClientSecret'
                }
        }
        accounting {
                reference = "%{tolower:type.%{Acct-Status-Type}}"
                type {
                        start {
                                update {
                                        description := "Online at %S"
                                }
                        }
                        interim-update {
                                update {
                                        description := "Last seen at %S"
                                }
                        }
                        stop {
                                update {
                                        description := "Offline at %S"
                                }
                        }
                }
        }
        post-auth {
                update {
                        description := "Authenticated at %S"
                }
        }
        options {
                chase_referrals = yes
                rebind = yes
                res_timeout = 10
                srv_timelimit = 3
                net_timeout = 1
                idle = 60
                probes = 3
                interval = 3
                ldap_debug = 0x0028
        }
        tls {
        }
        pool {
                start = ${thread[pool].start_servers}
                min = ${thread[pool].min_spare_servers}
                max = ${thread[pool].max_servers}
                spare = ${thread[pool].max_spare_servers}
                uses = 0
                retry_delay = 30
                lifetime = 0
                idle_timeout = 60
        }
}

5在 mods-enabled/ 下执行ln 注意后面有点

ln -s ../mods-available/ldap .

6在 sites-available/ 下创建 site_ldap
[root@10-57-22-55 sites-available]# cat site_ldap

server site_ldap {   
    listen {   
         ipaddr = 0.0.0.0  
         port = 1833  
         type = auth  
    }   
    authorize {  
         update {  
             control:Auth-Type := ldap  
         }  
    }  
    authenticate {  
        Auth-Type ldap {  
            ldap  
        }  
    }  
     
    post-auth {  
        Post-Auth-Type Reject {  
        }  
    }  
}  

7在 sites-enabled/ 下执行ln 注意后面有点

 ln -s ../sites-available/site_ldap .

重启服务器
systemctl restart radiusd.service

测试命令如下
radtest user password localhost:1833 0 testing123

以下结果表示成功：Received Access-Accep（密码带特殊字符需要用‘’引号引起来）

[root@10-57-22-55 sites-available]# radtest shanfu.wu 'xxx!*@Txxxdxx' localhost:1833 0 testing123  
Sent Access-Request Id 133 from 0.0.0.0:34144 to 127.0.0.1:1833 length 79
        User-Name = "shanfu.wu"
        User-Password = "xxxxxx"
        NAS-IP-Address = 127.0.0.1
        NAS-Port = 0
        Message-Authenticator = 0x00
        Cleartext-Password = "xxxxxx"
Received Access-Accept Id 133 from 127.0.0.1:1833 to 0.0.0.0:0 length 20

以下为密码错误Received Access-Reject

[root@10-57-22-55 sites-available]# radtest shanfu.wu xxxxx localhost:1833 0 testing123
Sent Access-Request Id 114 from 0.0.0.0:37246 to 127.0.0.1:1833 length 95
        User-Name = "shanfu.wu"
        User-Password = "xxxxx"
        NAS-IP-Address = 127.0.0.1
        NAS-Port = 0
        Message-Authenticator = 0x00
        Cleartext-Password = "xxxx"
Received Access-Reject Id 114 from 127.0.0.1:1833 to 0.0.0.0:0 length 20
(0) -: Expected Access-Accept got Access-Reject