SAML 令牌仅在 10 小时后过期

Question

我正在使用基于 WIF (.NET 4.0) 的自定义 STS，目前仅用于 SharePoint 应用程序。我在 HTTP 模块中设置了可按预期工作的滑动到期代码，但安全令牌的生命周期为 10 小时（默认生命周期）。

/// <summary>
/// Handles the SessionSecurityTokenReceived event of the SingleSignOnModule control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="Microsoft.IdentityModel.Web.SessionSecurityTokenReceivedEventArgs"/> instance containing the event data.</param>
private void SingleSignOnModule_SessionSecurityTokenReceived(Object sender, SessionSecurityTokenReceivedEventArgs e)
{
    using (new SPMonitoredScope("SingleSignOnModule-SessionSecurityTokenReceived"))
    {
        if ((HttpContext.Current != null) && (FederatedAuthentication.SessionAuthenticationModule != null) && (e != null))
        {
            TimeSpan logonTokenCacheExpirationWindow = TimeSpan.FromSeconds(1);
            SPSecurity.RunWithElevatedPrivileges(delegate()
            {
                logonTokenCacheExpirationWindow = SPSecurityTokenServiceManager.Local.LogonTokenCacheExpirationWindow;
            });

            DateTime currentDateTime = DateTime.UtcNow;
            TimeSpan sessionLifetime = (e.SessionToken.ValidTo - e.SessionToken.ValidFrom);
            DateTime sessionValidFrom = e.SessionToken.ValidFrom;
            DateTime sessionValidTo = (e.SessionToken.ValidTo - logonTokenCacheExpirationWindow);

            if ((currentDateTime < sessionValidTo) && (currentDateTime > sessionValidFrom.AddMinutes(sessionLifetime.TotalMinutes / 2)))
            {
                e.SessionToken = FederatedAuthentication.SessionAuthenticationModule.CreateSessionSecurityToken(e.SessionToken.ClaimsPrincipal, e.SessionToken.Context, currentDateTime, currentDateTime.AddMinutes(sessionLifetime.TotalMinutes), e.SessionToken.IsPersistent);
                e.ReissueCookie = true;
            }
        }
    }
}

最初，我认为这可以由 SPSecurityTokenServiceManager 设置。然而，这并没有改变什么。 (PowerShell sn-p)

Write-Output("[INFO] Updating the SPSecurityTokenServiceManager")
$stsMgr = Get-SPSecurityTokenServiceConfig

Write-Output("[INFO] Updating the SPSecurityTokenServiceManager to use session cookies.")
$stsMgr.UseSessionCookies = $true; #

Write-Output("[INFO] Updating the SPSecurityTokenServiceManager logon token cache expiration window")
$stsMgr.LogonTokenCacheExpirationWindow = New-TimeSpan -Days 0 -Hours 0 -Minutes 1

Write-Output("[INFO] Updating the SPSecurityTokenServiceManager service token cache expiration window.")
$stsMgr.ServiceTokenCacheExpirationWindow = New-TimeSpan -Days 0 -Hours 0 -Minutes 20

$stsMgr.Update()

我无法设置 SessionSecurityTokenHandler.DefaultLifetime，因为它是只读的并设置为 10 小时。

// Type: Microsoft.IdentityModel.Tokens.SecurityTokenHandler
// Assembly: Microsoft.IdentityModel, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
// Assembly location: C:\Windows\assembly\GAC_MSIL\Microsoft.IdentityModel\3.5.0.0__31bf3856ad364e35\Microsoft.IdentityModel.dll

namespace Microsoft.IdentityModel.Tokens
{
    public class SessionSecurityTokenHandler : SecurityTokenHandler
    {
        public static readonly TimeSpan DefaultLifetime = TimeSpan.FromHours(10.0);
        ...
    }
}

SecurityToken.ValidTo 只有一个 getter 而不是一个 setter。

// Type: System.IdentityModel.Tokens.SecurityToken
// Assembly: System.IdentityModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
// Assembly location: C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\System.IdentityModel.dll

namespace System.IdentityModel.Tokens
{
    /// <summary>
    /// Represents a base class used to implement all security tokens.
    /// </summary>
    /// <filterpriority>2</filterpriority>
    public abstract class SecurityToken
    {
        ...

        /// <summary>
        /// Gets the last instant in time at which this security token is valid.
        /// </summary>
        /// 
        /// <returns>
        /// A <see cref="T:System.DateTime"/> that represents the last instant in time at which this security token is valid.
        /// </returns>
        /// <filterpriority>2</filterpriority>
        public abstract DateTime ValidTo { get; }

        ...
    }
}

我还注意到，在FederatedAuthentication.SessionAuthenticationModule.CreateSessionSecurityToken 中，默认的 ValidTo 属性设置为 ValidFrom + 默认令牌生命周期。我可以看到设置 SecurityToken.ValidTo 的唯一方法是创建安全令牌时。这是否意味着我需要实现自定义 SecurityToken 类或者是否存在 在 WIF 堆栈的某个地方我可以拦截令牌的创建吗？到目前为止，我似乎只找到了以下事件处理程序FederatedAuthentication.SessionAuthenticationModule.SessionSecurityTokenCreated，但此时令牌已经创建，我可以在其中访问令牌，但正如预期的那样，SecurityToken.ValidTo 属性只是一个吸气剂。

<microsoft.identityModel /> 配置部分似乎也没有此设置。有一个 persistenLifeTime 设置，但这仅适用于写入磁盘的 cookie。

<microsoft.identityModel>
      <federatedAuthentication>
        <wsFederation
            persistentCookiesOnPassiveRedirects="true" />
        <cookieHandler 
          persistentSessionLifetime="60.0:0:0" />
      </federatedAuthentication>
</microsoft.identityModel>

此外，为了使加密/解密与服务器无关，加密使用证书。为此，我以编程方式将会话安全令牌处理程序添加到我的联合提供程序的 Global.asax 中。我只提到这一点是因为我想知道，如果我需要自定义 SecurityToken.ValidTo，我可能需要创建一个自定义安全令牌处理程序类，还是我目前在 Global.asax 中的做法很好，我需要寻找其他地方来解决SecurityToken.ValidTo 问题？

  <microsoft.identityModel>
    <service>
      <serviceCertificate>
        <certificateReference x509FindType="FindByThumbprint" findValue="myThumbPrint" />
      </serviceCertificate>
      ...
  </microsoft.identityModel>

namespace MyCompany.IdentityServer.FederationProvider
{
    public class Global : System.Web.HttpApplication
    {
        /// <summary>
        /// Handles the Start event of the Application control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>
        protected void Application_Start(object sender, EventArgs e)
        {
            FederatedAuthentication.ServiceConfigurationCreated += OnServiceConfigurationCreated;
        }

        /// <summary>
        /// Called when [service configuration created].
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The <see cref="Microsoft.IdentityModel.Web.Configuration.ServiceConfigurationCreatedEventArgs"/> instance containing the event data.</param>
        private void OnServiceConfigurationCreated(object sender, ServiceConfigurationCreatedEventArgs e)
        {
            // The session security token handler needs to be overridden so that encryption/decryption is not server dependent via DPAPI.
            // We need encryption/decryption to be server agnostic, so we make it certificate based instead.
            // See http://blogs.msdn.com/b/distributedservices/archive/2012/10/29/wif-1-0-id1073-a-cryptographicexception-occurred-when-attempting-to-decrypt-the-cookie-using-the-protecteddata-api.aspx

            // Use the <serviceCertificate> to protect the cookies that are
            // sent to the client.
            var sessionTransforms =
                new List<CookieTransform>(new CookieTransform[] {
                new DeflateCookieTransform(), 
                new RsaEncryptionCookieTransform(e.ServiceConfiguration.ServiceCertificate),
                new RsaSignatureCookieTransform(e.ServiceConfiguration.ServiceCertificate)  });

            var sessionHandler = new SessionSecurityTokenHandler(sessionTransforms.AsReadOnly());

            // This does nothing
            //sessionHandler.TokenLifetime = someLifeTime;

            e.ServiceConfiguration.SecurityTokenHandlers.AddOrReplace(sessionHandler);
        }
    }
}

如果我创建一个自定义 securityTokenHandler，我看到我可以指定一个生命周期，但这看起来就像我在上面的 Global.asax 中尝试的那样，sessionHandler.TokenLifetime = ...

  <microsoft.identityModel>
    <service>
        <securityTokenHandlers>
          <add type="System.IdentityModel.Tokens.SessionSecurityTokenHandler, System.IdentityModel">
            <sessionTokenRequirement lifetime="TimeSpan" />
          </add>
        </securityTokenHandlers>
      ...
    </service>
</microsoft.identityModel>

我只能假设我错过了一些明显的设置，或者是我唯一的定制行动方案以获得我需要的 SecurityToken.ValidTo？

Answer 1

在 STS 中 - 设置 SecurityTokenConfigurationConfiguration 类的 DefaultTokenLifetime 属性以覆盖 10h 默认值。

Answer 2

你可以使用这个 powershell 脚本来增加它

$sts = Get-SPSecurityTokenServiceConfig
$sts.FormsTokenLifeTime = (New-TimeSpan -minutes <NUMBER_OF_MINUTES>)
$sts.Update()
Get-SPSecurityTokenServiceConfig