c# – 绑定安全性为TransportCredentialOnly时,在WCF REST中创建

我需要实现一个使用HTTP基本身份验证的REST服务.由于它是在现有基础架构上构建的,因此我需要将其实现为WCF服务.出于向后兼容性和集成到现有生态系统的原因,我需要将用户名和密码都传递给服务(此时请不要考虑可能的安全隐患).由于默认情况下WCF运行时从标头中删除了身份验证信息,因此我的解决方案是创建一个包含密码信息的自定义IIdentity,我可以在服务级别访问该信息：

public class UserIdentity : GenericIdentity
{
    private readonly bool m_isAuthenticated;

    public string Password {
        get;
    }

    public override bool IsAuthenticated {
        get {
            return base.IsAuthenticated && m_isAuthenticated;
        }
    }
    public UserIdentity(IIdentity existingIdentity,string password)
        : base(existingIdentity.Name)
    {
        m_isAuthenticated = existingIdentity.IsAuthenticated;
        Password = password;
    }
}

我试图通过以下方式转发密码,所有这些都没有运气：

>实现自定义UserNamePasswordValidator,它可以访问密码,但只能处理身份验证.没有办法创建或修改IIdentity.
>创建自定义ServiceCredentials as described in this article,当绑定安全性设置为传输时,它可以正常工作.然而,这需要与服务的HTTPS连接,这对我来说是不可行的,因为传输级安全性由上游的负载平衡器处理.服务本身必须是HTTP.因此,安全性设置为TransportCredentialOnly.这样做的结果是自定义ServiceCredentials类永远不会被WCF运行时初始化(与安全性设置为Transport不同).
>直接在app.config中配置自定义AuthorizationPoliciy.在这种情况下,自定义授权策略已初始化,但在密码信息已不再可用的位置调用(当使用ServiceCredentials初始化时,这不是问题,因为它在初始化期间确实接收到密码).

自定义ServiceCredentials和AuthorizationPolicy实现如下：

public class UserServiceCredentials : ServiceCredentials
{
    public UserServiceCredentials()
    {
    }

    protected UserServiceCredentials(ServiceCredentials other) : base(other)
    {
    }

    protected override ServiceCredentials CloneCore()
    {
        return new UserServiceCredentials(this);
    }

    public override SecurityTokenManager CreateSecurityTokenManager()
    {
        if (UserNameAuthentication.UserNamePasswordValidationMode == UserNamePasswordValidationMode.Custom)
        {
            return new UserSecurityTokenManager(this);
        }
        return base.CreateSecurityTokenManager();
    }
}

internal class UserSecurityTokenManager : ServiceCredentialsSecurityTokenManager
{
    public UserSecurityTokenManager(UserServiceCredentials credentials) : base(credentials)
    {
    }

    public override SecurityTokenAuthenticator CreateSecurityTokenAuthenticator(SecurityTokenRequirement tokenRequirement,out SecurityTokenResolver outOfBandTokenResolver)
    {
        outOfBandTokenResolver = null;
        UserNamePasswordValidator validator = ServiceCredentials.UserNameAuthentication.CustomUserNamePasswordValidator;
        return new UserSecurityTokenAuthenticator(validator ?? new Validator());
    }
}

internal class UserSecurityTokenAuthenticator : CustomUserNameSecurityTokenAuthenticator
{
    public UserSecurityTokenAuthenticator(UserNamePasswordValidator validator) : base(validator)
    {
    }

    protected override ReadOnlyCollection<IAuthorizationPolicy> ValidateUserNamePasswordCore(string userName,string password)
    {
        ReadOnlyCollection<IAuthorizationPolicy> currentPolicies =
            base.ValidateUserNamePasswordCore(userName,password);
        List<IAuthorizationPolicy> policies = new List<IAuthorizationPolicy>(currentPolicies);
        policies.Add(new UserAuthorizationPolicy(userName,password));
        return policies.AsReadOnly();
    }
}

public class UserAuthorizationPolicy : IAuthorizationPolicy
{
    private string m_userName;
    private string m_password;

    //Called when used with service credentials
    public UserAuthorizationPolicy(string userName,string password)
    {
        m_userName = userName;
        m_password = password;
    }

    //Called when directly configured in the config file
    public UserAuthorizationPolicy()
    {
    }

    public ClaimSet Issuer {
        get;
    } = ClaimSet.System;

    public string Id {
        get;
    } = Guid.NewGuid().ToString();

    public bool Evaluate(EvaluationContext evaluationContext,ref object state)
    {
        bool hasIdentities = evaluationContext.Properties.TryGetValue("Identities",out object rawIdentities);
        if (rawIdentities is IList<IIdentity> identities)
        {
            var identityQry =
                from id in identities
                where String.Equals(id.Name,m_userName,StringComparison.OrdinalIgnoreCase)
                select id;
            IIdentity identity = identityQry.FirstOrDefault();
            if (identity == null)
            {
                return false;
            }
            UserIdentity userIdentity = new UserIdentity(identity,m_password);
            identities.Remove(identity);
            identities.Add(userIdentity);

            evaluationContext.Properties["PrimaryIdentity"] = userIdentity;
            evaluationContext.Properties["Principal"] = new GenericPrincipal(userIdentity,null);

            return true;
        }
        else
        {
            return false;
        }
    }
}

我正在使用的app.config是这样的：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup>
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
    <system.serviceModel>
        <bindings>
            <webHttpBinding>
                <binding name="TestBinding">
                    <security mode="TransportCredentialOnly">
                        <transport clientCredentialType="Basic">
                        </transport>
                    </security>
                </binding>
            </webHttpBinding>
        </bindings>
        <behaviors>
            <serviceBehaviors>
                <behavior name="TestServiceBehavior">
                    <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true" />
                    <serviceDebug includeExceptionDetailInFaults="true"/>
                    <!-- Custom service credentials: Works when binding security is Transport. Is not invoked when security TransportCredentialOnly-->
                    <serviceCredentials type="WcfTestServices.UserServiceCredentials,WcfTestServices">
                        <userNameAuthentication userNamePasswordValidationMode="Custom" customUserNamePasswordValidatorType="WcfTestServices.Validator,WcfTestServices"/>
                    </serviceCredentials>
                    <serviceAuthorization principalPermissionMode="Custom">
                        <!-- Authorization policy works when binding security is TransportCredentialOnly,but has no password -->
                        <authorizationPolicies>
                            <add policyType="WcfTestServices.UserAuthorizationPolicy,WcfTestServices"/>
                        </authorizationPolicies>
                    </serviceAuthorization>
                </behavior>
            </serviceBehaviors>
            <endpointBehaviors>
                <behavior name="TestEndpointBehavior">
                    <webHttp/>
                </behavior>
            </endpointBehaviors>
        </behaviors>
        <services>
            <service name="WcfTestServices.TestService" behaviorConfiguration="TestServiceBehavior">
                <endpoint address="" binding="webHttpBinding"
                                    bindingConfiguration="TestBinding"
                                    behaviorConfiguration="TestEndpointBehavior"
                                    contract="WcfTestServices.ITestService"/>
                <host>
                    <baseAddresses>
                        <add baseAddress="http://localhost:12700/"/>
                    </baseAddresses>
                </host>
            </service>
        </services>
    </system.serviceModel>
</configuration>

有没有办法可以将密码信息转发到这个星座中的服务？我首选的解决方案是自定义IIdentity,但我愿意接受其他建议.

public class IdentityMessageInspector : IDispatchMessageInspector
{
    public object AfterReceiveRequest(ref Message request,System.ServiceModel.IClientChannel channel,System.ServiceModel.InstanceContext instanceContext)
        {
            var messageProperty = (HttpRequestMessageProperty)
                OperationContext.Current.IncomingMessageProperties[HttpRequestMessageProperty.Name];
            string cookie = messageProperty.Headers.Get("Set-Cookie");
            if (cookie == null) // Check for another Message Header - SL applications
            {
                cookie = messageProperty.Headers.Get("Cookie");
            }
            if (cookie == null)
                cookie = string.Empty;
            //You can get the credentials from here,do something to them,on the service side
}

public void ApplyDispatchBehavior(ServiceDescription serviceDescription,System.ServiceModel.ServiceHostBase serviceHostBase)
    {
        foreach (ChannelDispatcher dispatcher in serviceHostBase.ChannelDispatchers)
        {
            foreach (var endpoint in dispatcher.Endpoints)
            {
                endpoint.DispatchRuntime.MessageInspectors.Add(new IdentityMessageInspector());
            }
        }
    }

<extensions>
  <behaviorExtensions>
    <add name="interceptorBehaviorExtension" type="test.InterceptorBehaviorExtension,test,Version=1.0.0.0,Culture=neutral,PublicKeyToken=null"/>
  </behaviorExtensions>
</extensions>

<interceptorBehaviorExtension />

public void ApplyClientBehavior(ServiceEndpoint endpoint,System.ServiceModel.Dispatcher.ClientRuntime clientRuntime)
        {
            clientRuntime.MessageInspectors.Add(new CookieMessageInspector());
        }

var messageProperty = (HttpRequestMessageProperty)OperationContext.Current
    .IncomingMessageProperties[HttpRequestMessageProperty.Name];

string authorization = message.Headers.Get("Authorization");