SSH with Kerbors5 on Ubuntu

kerberos server and admin server install

sudo apt install krb5-kdc krb5-admin-server

key config in /etc/krb5.conf

[libdefaults]
    default_realm = EXAMPLE.COM
[realms]
    EXAMPLE.COM = {
        kdc = kdc.example.com
        admin_server = kbr-admin.example.com
    }
#init realm
# may be take long time to wait after the notice `Loading random data`
krb5_newrealm

添加用户

kadmin.local
addprinc username
# 给机器 s1 添加 Princple 及 keytab ， 并将该 keytab 复制到 s1 机器 /etc 目录下， sshd 会用到 krb5.keytab, 确定主机名一致
kadmin.local -q "addprinc -randkey host/s1.dev.example.com"
kadmin.local -q " ktadd -k /etc/krb5.keytab host/s1.dev.example.com"

ssh server

保证跟 kdc 一样的 krb5.conf

[libdefaults]
    default_realm = EXAMPLE.COM
[realms]
    EXAMPLE.COM = {
        kdc = kdc.example.com
        admin_server = kbr-admin.example.com
    }

修改 /etc/ssh/sshd_config

KerberosAuthentication yes
KerberosTicketCleanup yes
GSSAPIAuthentication yes
GSSAPICleanupCredentials yes

在 $HOME/.k5login 中列出允许登录的 princ

[email protected]

ssh client

install kerberos client

apt install krb5-user

# 初始化 ticket
kinit user

xshell 通过 kerberos 登录

安装 MIT Kerberos for Windows 4.1

使用上面的 krb5.conf 覆盖到 C:\ProgramData\MIT\Kerberos5\krb5.ini, 或通过 KRB5_CONFIG 环境变量指定 krb5.ini 位置

参考文章

https://help.ubuntu.com/lts/serverguide/kerberos.html.en#kerberos-server http://www.visolve.com/ssh.php#Kerberos_Authentication https://docs.oracle.com/cd/E19253-01/819-7061/6n91j2vds/index.html

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