如何确定身份验证类型是否为 Kerberos

项目
05/30/2024

本文提供了一个查询，可帮助你确定连接到 Microsoft SQL Server 时使用的身份验证类型。请确保在客户端计算机上运行查询，而不是在要测试的 SQL Server 上运行查询。否则，即使正确配置了 Kerberos，查询也会 auth_scheme 返回 NTLM 。出现这种情况的原因是 Windows 2008 中添加的按服务 SID 安全强化功能。无论 Kerberos 是否可用，此功能都会强制所有本地连接使用 NTLM。

 SELECT auth_scheme FROM sys.dm_exec_connections WHERE session_id=@@SPID

使用 SQL Server Management Studio

在 SQL Server Management Studio 中运行以下查询：

SELECT c.session_id, c.net_transport, c.encrypt_option,
       c.auth_scheme, s.host_name, @@SERVERNAME as "remote_name",
       s.program_name, s.client_interface_name, s.login_name,
       s.nt_domain, s.nt_user_name, s.original_login_name,
       c.connect_time, s.login_time
FROM sys.dm_exec_connections AS c
JOIN sys.dm_exec_sessions AS s ON c.session_id = s.session_id
WHERE c.session_id=@@SPID

使用命令行

在命令提示符下运行以下查询：

C:\Temp>sqlcmd -S SQLProd01 -E -Q "select auth_scheme from sys.dm_exec_connections where session_id=@@SPID"
auth_scheme
----------------------------------------
NTLM

(1 rows affected)

替代方法

如果上述任一选项都不可用，请考虑使用以下备用过程：

将以下脚本复制到文本编辑器（如记事本）中，并将其另存为 getAuthScheme.vbs：

' Auth scheme VB script.
' Run on a client machine, not the server.
' If you run locally, you will always get NTLM even if Kerberos is properly enabled.
'
' USAGE:  CSCRIPT getAuthScheme.vbs tcp:SQLProd01.contoso.com,1433   ' explicitly specify DNS suffix, protocol, and port # ('tcp' must be lower case)
' USAGE:  CSCRIPT getAuthScheme.vbs SQLProd01                        ' let the driver figure out the DNS suffix, protocol, and port #
'
Dim cn, rs, s
s = WScript.Arguments.Item(0)              ' get the server name from the command-line
Set cn = createobject("adodb.connection")
'
' Various connection strings depending on the driver/Provider installed on your machine
' SQLOLEDB is selected as it is on all windows machines, but may have limitations, such as lack of TLS 1.2 support
' Choose a newer provider or driver if you have it installed.
'
cn.open "Provider=SQLOLEDB;Data Source=" & s & ";Initial Catalog=master;Integrated Security=SSPI"          ' On all Windows machines
'cn.open "Provider=SQLNCLI11;Data Source=" & s & ";Initial Catalog=master;Integrated Security=SSPI"        ' Newer
'cn.open "Provider=MSOLEDBSQL;Data Source=" & s & ";Initial Catalog=master;Integrated Security=SSPI"       ' Latest, good for SQL 2012 and newer
'cn.open "Driver={ODBC Driver 17 for SQL Server};Server=" & s & ";Database=master;Trusted_Connection=Yes"  ' Latest
'
' Run the query and display the results
'
set rs = cn.Execute("select auth_scheme from sys.dm_exec_connections where session_id=@@SPID")
WScript.Echo "Auth scheme: " & rs(0)
rs.close
cn.close

在命令提示符下运行 getAuthScheme.vbs PowerShell 脚本：

C:\Temp>cscript getAuthScheme.vbs SQLProd01

应会看到以下输出：

Microsoft (R) Windows Script Host Version 5.812
Copyright (C) Microsoft Corporation. All rights reserved.
Auth scheme: NTLM

使用 PowerShell

可以使用 PowerShell 测试 SqlClient .NET 提供程序，以尝试将问题与应用程序隔离开来：

将以下脚本复制到文本编辑器（如记事本）中，并将其另存为 get-SqlAuthScheme.ps1。

在命令提示符下运行以下脚本：

#-------------------------------
#
# get-SqlAuthScheme.ps1
#
# PowerShell script to test a System.Data.SqlClient database connection
#
# USAGE: .\get-SqlAuthScheme tcp:SQLProd01.contoso.com,1433   ' explicitly specify DNS suffix,  protocol, and port # ('tcp' must be lower case)
# USAGE: .\get-SqlAuthScheme SQLProd01                        ' let the driver figure out the DNS suffix, protocol, and port #
#
#-------------------------------
param ([string]$server = "localhost")
Set-ExecutionPolicy Unrestricted-Scope CurrentUser
$connstr = "Server=$server;Database=master;Integrated Security=SSPI"
[System.Data.SqlClient.SqlConnection] $conn = New-Object System.Data.SqlClient.SqlConnection
$conn.ConnectionString = $connstr
[System.DateTime] $start = Get-Date
$conn.Open()
[System.Data.SqlClient.SqlCommand] $cmd = New-Object System.Data.SqlClient.SqlCommand
$cmd.CommandText = "select auth_scheme from sys.dm_exec_connections where session_id=@@spid"
$cmd.Connection = $conn
$dr = $cmd.ExecuteReader()
$result = $dr.Read()
$auth_scheme = $dr.GetString(0)
$conn.Close()
$conn.Dispose()
[System.DateTime] $end = Get-Date
[System.Timespan] $span = ($end - $start)
"End time: " + $end.ToString("M/d/yyyy HH:mm:ss.fff")
"Elapsed time was " + $span.Milliseconds + " ms."
"Auth scheme for " + $server + ": " + $auth_scheme