ServiceAuthorizationManager.CheckAccess 方法

参考

定义

命名空间:: System.ServiceModel

程序集:: System.ServiceModel.dll

重要

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检查给定操作上下文和可选消息的授权。

重载

CheckAccess(OperationContext)	检查给定操作上下文的授权。
CheckAccess(OperationContext, Message)	访问所需的消息时，检查给定操作上下文的授权。

CheckAccess(OperationContext)

检查给定操作上下文的授权。

public:
 virtual bool CheckAccess(System::ServiceModel::OperationContext ^ operationContext);

public virtual bool CheckAccess (System.ServiceModel.OperationContext operationContext);

abstract member CheckAccess : System.ServiceModel.OperationContext -> bool
override this.CheckAccess : System.ServiceModel.OperationContext -> bool

Public Overridable Function CheckAccess (operationContext As OperationContext) As Boolean

参数

operationContext: OperationContext

OperationContext

Boolean

如果授予访问权限，则为 true；否则为 false。默认值为 true。

示例

下面的代码演示如何重写此方法，以强制执行自定义访问控制需求。

public class myServiceAuthorizationManager : ServiceAuthorizationManager
{
    // Override the CheckAccess method to enforce access control requirements.
    public override bool CheckAccess(OperationContext operationContext)
    {
        AuthorizationContext authContext =
        operationContext.ServiceSecurityContext.AuthorizationContext;
        if (authContext.ClaimSets == null) return false;
        if (authContext.ClaimSets.Count != 1) return false;
        ClaimSet myClaimSet = authContext.ClaimSets[0];
        if (!IssuedBySTS_B(myClaimSet)) return false;
        if (myClaimSet.Count != 1) return false;
        Claim myClaim = myClaimSet[0];
        if (myClaim.ClaimType ==
          "http://www.tmpuri.org:accessAuthorized")
        {
            string resource = myClaim.Resource as string;
            if (resource == null) return false;
            if (resource != "true") return false;
            return true;
        }
        else
        {
            return false;
        }
    }

    // This helper method checks whether SAML Token was issued by STS-B.
    // It compares the Thumbprint Claim of the Issuer against the
    // Certificate of STS-B.
    private bool IssuedBySTS_B(ClaimSet myClaimSet)
    {
        ClaimSet issuerClaimSet = myClaimSet.Issuer;
        if (issuerClaimSet == null) return false;
        if (issuerClaimSet.Count != 1) return false;
        Claim issuerClaim = issuerClaimSet[0];
        if (issuerClaim.ClaimType != ClaimTypes.Thumbprint)
            return false;
        if (issuerClaim.Resource == null) return false;
        byte[] claimThumbprint = (byte[])issuerClaim.Resource;
        // It is assumed that stsB_Certificate is a variable of type
        // X509Certificate2 that is initialized with the Certificate of
        // STS-B.
        X509Certificate2 stsB_Certificate = GetStsBCertificate();
        byte[] certThumbprint = stsB_Certificate.GetCertHash();
        if (claimThumbprint.Length != certThumbprint.Length)
            return false;
        for (int i = 0; i < claimThumbprint.Length; i++)
        {
            if (claimThumbprint[i] != certThumbprint[i]) return false;
        }
        return true;
    }

Public Class myServiceAuthorizationManager
    Inherits ServiceAuthorizationManager

    ' Override the CheckAccess method to enforce access control requirements.
    Public Overloads Overrides Function CheckAccess(ByVal operationContext As OperationContext) As Boolean
        Dim authContext = operationContext.ServiceSecurityContext.AuthorizationContext
        If authContext.ClaimSets Is Nothing Then
            Return False
        End If

        If authContext.ClaimSets.Count <> 1 Then
            Return False
        End If

        Dim myClaimSet = authContext.ClaimSets(0)
        If Not IssuedBySTS_B(myClaimSet) Then
            Return False
        End If
        If myClaimSet.Count <> 1 Then
            Return False
        End If
        Dim myClaim = myClaimSet(0)
        If myClaim.ClaimType = "http://www.tmpuri.org:accessAuthorized" Then
            Dim resource = TryCast(myClaim.Resource, String)
            If resource Is Nothing Then
                Return False
            End If
            If resource <> "true" Then
                Return False
            End If
            Return True
        Else
            Return False
        End If
    End Function

    ' This helper method checks whether SAML Token was issued by STS-B.     
    ' It compares the Thumbprint Claim of the Issuer against the 
    ' Certificate of STS-B. 
    Private Function IssuedBySTS_B(ByVal myClaimSet As ClaimSet) As Boolean
        Dim issuerClaimSet = myClaimSet.Issuer
        If issuerClaimSet Is Nothing Then
            Return False
        End If
        If issuerClaimSet.Count <> 1 Then
            Return False
        End If
        Dim issuerClaim = issuerClaimSet(0)
        If issuerClaim.ClaimType <> ClaimTypes.Thumbprint Then
            Return False
        End If
        If issuerClaim.Resource Is Nothing Then
            Return False
        End If
        Dim claimThumbprint() = CType(issuerClaim.Resource, Byte())
        ' It is assumed that stsB_Certificate is a variable of type 
        ' X509Certificate2 that is initialized with the Certificate of 
        ' STS-B.
        Dim stsB_Certificate = GetStsBCertificate()
        Dim certThumbprint() = stsB_Certificate.GetCertHash()
        If claimThumbprint.Length <> certThumbprint.Length Then
            Return False
        End If
        For i = 0 To claimThumbprint.Length - 1
            If claimThumbprint(i) <> certThumbprint(i) Then
                Return False
            End If
        Next i
        Return True
    End Function

注解

一般而言，应用程序应该重写 CheckAccessCore 代替这个方法。

如果应用程序为生成的 CheckAccess 关联或引入一组不同的策略，或另外提供一个策略评估（链接）模型，则重写 ServiceSecurityContext。

此方法负责调用 CheckAccessCore。

适用于

CheckAccess(OperationContext, Message)

访问所需的消息时，检查给定操作上下文的授权。

public:
 virtual bool CheckAccess(System::ServiceModel::OperationContext ^ operationContext, System::ServiceModel::Channels::Message ^ % message);

public virtual bool CheckAccess (System.ServiceModel.OperationContext operationContext, ref System.ServiceModel.Channels.Message message);

abstract member CheckAccess : System.ServiceModel.OperationContext * Message -> bool
override this.CheckAccess : System.ServiceModel.OperationContext * Message -> bool

Public Overridable Function CheckAccess (operationContext As OperationContext, ByRef message As Message) As Boolean

参数

operationContext: OperationContext

OperationContext

message: Message

要接收检查以确定授权的 Message。

Boolean

如果授予访问权限，则为 true；否则为 false。默认值为 true。

示例

下面的代码演示如何重写此方法，以强制执行需要访问消息正文的自定义访问控制需求。

public class myService_M_AuthorizationManager : ServiceAuthorizationManager
{
    // set max size for message
    int someMaxSize = 16000;
    protected override bool CheckAccessCore(OperationContext operationContext, ref Message message)
    {
        bool accessAllowed = false;
        MessageBuffer requestBuffer = message.CreateBufferedCopy(someMaxSize);

        // do access checks using the message parameter value and set accessAllowed appropriately
        if (accessAllowed)
        {
            // replace incoming message with fresh copy since accessing the message consumes it
            message = requestBuffer.CreateMessage();
        }
        return accessAllowed;
    }
}

Public Class myService_M_AuthorizationManager
    Inherits ServiceAuthorizationManager

    ' set max size for message
    Private someMaxSize As Integer = 16000

    Public Overrides Function CheckAccess(ByVal operationContext As OperationContext, _
                                          ByRef message As Message) As Boolean
        Dim accessAllowed = False
        Dim requestBuffer = Message.CreateBufferedCopy(someMaxSize)

        ' do access checks using the message parameter value and set accessAllowed appropriately
        If accessAllowed Then
            ' replace incoming message with fresh copy since accessing the message consumes it
            Message = requestBuffer.CreateMessage()
        End If
        Return accessAllowed
    End Function
End Class

注解

一般而言，应用程序应该重写 CheckAccessCore 取代这个方法，这仅在授权决定取决于消息正文的情况下使用。由于性能问题，如有可能，应重新设计应用程序，使授权决策不需要访问消息正文。

如果应用程序为生成的和关联或引入一组不同的策略，或另外提供一个策略评估（链接）模型，则重写此方法。

此方法负责调用 CheckAccessCore。

适用于

通过

ServiceAuthorizationManager.CheckAccess 方法

定义

重载

CheckAccess(OperationContext)

参数

返回

示例

注解

适用于

CheckAccess(OperationContext, Message)

参数

返回

示例

注解

适用于

其他资源