架设MIT Kerberos KDC

KDC (Key Distribute Center)是任何采用Kerberos鉴权和/或加密的应用程序所必须的。本文记述在Arch Linux上以MIT Kerberos设置KDC之过程。

安装krb5包

sudo pacman -S krb5

编辑/etc/krb5.conf，/var/lib/krb5kdc/kdc.conf及/var/lib/krb5kdc/kadm5.acl(须创建此文件)

# /etc/krb5.conf
[libdefaults]
	default_realm = OXLAB.ORG

[realms]
	OXLAB.ORG = {
		admin_server = kdc.oxlab.org
		kdc = kdc.oxlab.org
		default_principal_flags = +preauth
	}

[domain_realm]
	oxlab.org = OXLAB.ORG
	.oxlab.org = OXLAB.ORG
	.n.oxlab.org = OXLAB.ORG
	.r.oxlab.org = OXLAB.ORG

[logging]

# /var/lib/krb5kdc/kdc.conf
[kdcdefaults]
	kdc_listen = 88
	kdc_tcp_listen = 88

[realms]
	OXLAB.ORG = {
		database_name = /var/lib/krb5kdc/principal
		acl_file = /var/lib/krb5kdc/kadm5.acl
		key_stash_file = /var/lib/krb5kdc/.k5.OXLAB.ORG
		kdc_listen = 88
		kdc_tcp_listen = 88
		max_life = 10h 0m 0s
		max_renewable_life = 7d 0h 0m 0s
	}

# /var/lib/krb5kdc/kadm5.acl
leo/admin@OXLAB.ORG *

创建Kerberos数据库，并设置密钥

sudo kdb5_util -r OXLAB.ORG create -s

运转并启用KDC和kadmind

sudo systemctl enable --now krb5-kdc.service krb5-kadmind.service

建立Principals，并将KDC的Principal加入/etc/krb5.keytab

sudo kadmin.local
# interactive shell

# user principals (without password)
addprinc -randkey leo
addprinc -randkey jenny

# admin principal (with password)
addprinc leo/admin

# KDC host principal
addprinc -randkey host/kdc.oxlab.org
kdadd host/kdc.oxlab.org

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将/etc/krb5.conf的内容复制到域中其他主机，运转kadmin -p leo/admin并输入上一步所设置之密码，便可通过kadmin远程管理KDC。

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后记

本文中包含如下假设:

1. 域的名称(realm)是OXLAB.ORG，所用域名为oxlab.org
2. KDC的主机名是kdc.oxlab.org
3. 管理员用户的Principal是leo/admin
4. 用户包含leo和jenny