Question

我正在使用基于WIF（.NET 4.0）的自定义STS，该STS目前仅用于SharePoint应用程序。我在HTTP模块中设置了滑动过期代码，该模块按预期工作，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。但是，这没有改变。（PowerShell代码段）

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 +默认令牌生存期。我可以看到设置SecurityToken.ValidTo的唯一方法是在创建安全令牌时。这是否意味着我需要实现一个自定义的SecurityToken类或者在那里在WIF堆栈的某个地方，我可以拦截令牌的创建？到目前为止，我似乎只找到了以下事件处理程序FederatedAuthentication.SessionAuthenticationModule.SessionSecurityTokenCreated，但此时已经创建了令牌，并且在那里我可以访问令牌，但正如预期的那样SecurityToken.ValidTo属性是只是一个吸气剂。

同样，<microsoft.identityModel />配置部分似乎没有此设置。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，我以编程方式添加到联合提供程序的Global.asax中的会话安全令牌处理程序。我只是提到这一点，因为我想知道，如果我需要自定义SecurityToken.ValidTo，我是否可能需要创建一个自定义安全令牌处理程序类，或者我现在是如何在Global.asax罚款和我需要到其他地方寻找解决SecurityToken.ValidTo问题的方法吗？

  <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);
        }
    }
}

如果我创建了一个自定义的securityTokenHandler，我发现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>

我只能假设我遗漏了一些显而易见的东西，或者我是唯一可以自定义以获得我需要的SecurityToken.ValidTo的行为？

Answer 1

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

Answer 2

您可以使用此PowerShell脚本增加它

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

SAML令牌仅在10小时后到期

2 个答案: