authentication - Kerberos aes-256 加密不起作用

Question

服务器是RHEL7，Kerberos是AD(Windows)。我只是 KDC 的客户。

Arcfour-hmac 工作正常，但是当我将加密类型更改为 aes-256 并设置新的 key 表时，kinit 仍然有效，但 kvno 无效。即使用户似乎拥有有效的票证(在 klist 中)，他也无法再启动服务。

我无权访问 Kerberos AD，但它似乎已正确配置为使用 aes-256，因为最终用户(在 Windows 计算机上)已经请求此加密类型的票证。

我的 krb5.conf :

[libdefaults]
default_realm = TOTO.NET
dns_lookup_realm = false
dns_lookup_kdc = false
ticket_lifetime = 24h
renew_lifetime = 7d
forwardable = true
default_tkt_enctypes = aes256-cts aes128-cts des-cbc-md5 des-cbc-crc
default_tgs_enctypes = aes256-cts aes128-cts des-cbc-md5 des-cbc-crc
permitted_enctypes = aes256-cts aes128-cts des-cbc-md5 des-cbc-crc

[realms]
TOTO.NET = {
  kdc = kdc1.toto.net
  kdc = kdc2.toto.net
  admin_server = kdc1.toto.net
}

[domain_realm]
.toto.net = TOTO.NET
toto.net = TOTO.NET

这里是我尝试使用 kvno 获取票时遇到的错误:

[2477332] 1493147723.961912: Getting credentials myuser@TOTO.NET -> nn/myserver@TOTO.NET using ccache FILE:/tmp/krb5cc_0 
[2477332] 1493147723.962055: Retrieving myuser@TOTO.NET -> nn/myserver@TOTO.NET from FILE:/tmp/krb5cc_0 with result: -1765328243/Matching credential not found (filename: /tmp/krb5cc_0) 
[2477332] 1493147723.962257: Retrieving myuser@TOTO.NET -> krbtgt/TOTO.NET@TOTO.NET from FILE:/tmp/krb5cc_0 with result: 0/Success 
[2477332] 1493147723.962267: Starting with TGT for client realm: myuser@TOTO.NET -> krbtgt/TOTO.NET@TOTO.NET 
[2477332] 1493147723.962274: Requesting tickets for nn/myserver@TOTO.NET, referrals on 
[2477332] 1493147723.962309: Generated subkey for TGS request: aes256-cts/17DF 
[2477332] 1493147723.962363: etypes requested in TGS request: aes256-cts, aes128-cts 
[2477332] 1493147723.962504: Encoding request body and padata into FAST request 
[2477332] 1493147723.962575: Sending request (1716 bytes) to TOTO.NET 
[2477332] 1493147723.962725: Resolving hostname kdc1.TOTO.NET 
[2477332] 1493147723.963054: Initiating TCP connection to stream ip_of_kdc1:88 
[2477332] 1493147723.964205: Sending TCP request to stream ip_of_kdc1:88 
[2477332] 1493147724.3751: Received answer (329 bytes) from stream ip_of_kdc1:88 
[2477332] 1493147724.3765: Terminating TCP connection to stream ip_of_kdc1:88 
[2477332] 1493147724.3846: Response was not from master KDC 
[2477332] 1493147724.3879: Decoding FAST response 
[2477332] 1493147724.3965: TGS request result: -1765328370/KDC has no support for encryption type

klist -ket mykeytab

Keytab name: FILE:nn.service.keytab
KVNO Timestamp           Principal
---- ------------------- ------------------------------------------------------
   1 01/01/1970 01:00:00 nn/myserver01@TOTO.NET (aes256-cts-hmac-sha1-96)
   1 03/22/2017 16:34:55 nn/myserver02@TOTO.NET (aes256-cts-hmac-sha1-96)

谢谢你的帮助

Answer 1

要求您的 AD 管理员在与 key 表关联的 AD 帐户上启用对 AES-256 加密类型的支持。要查找该帐户，请运行以下命令:

setspn -Q nn/myserver01@TOTO.NET

输出将告诉您帐户的名称。它将以 CN=xxx 开头，其中“xxx”是 AD 帐户的名称。要在 AD 帐户上启用对 AES-256 加密类型的支持，请告诉您的 AD 管理员必须选中复选框“此帐户支持 Kerberos AES 256 位加密”，该复选框位于“帐户”选项卡下，一直位于底部。