Webservice security in ASP.NET to implement access control-C#.Net Tutorial-php.cn

Webservice security in ASP.NET to implement access control

高洛峰

Release： 2017-01-24 09:50:43

Original

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1. Overview:

Web Services are online application services released by enterprises to fulfill their specific business needs. Other companies or application software can access and use this online service through the Internet. It logically provides data and services to other applications. Each application accesses the Web Service through network protocols and some specified standard data formats (Http, XML, Soap), and obtains the required results through internal execution of the Web Service. Since it is called through the Internet, there must be security issues that can be called by network users. How to implement webservice access permission restriction is an important problem faced by webservice users. Below are two solutions to solve the above problems from shallow to deep.

2. A simple method based on the "soapheader" attribute

1." soapheader" Overview

SOAP header provides a method for passing data to XML Web services methods or pass data from XML Web services methods, provided that the data is not directly related to the main functionality of the XML Web services method. In most cases, it is used to transmit user authentication information. Of course, its role is far more than that, and it remains to be discovered in practical applications.

2.soapheader implements user authentication code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
namespace UserCenter
{
  public class MySoapHeader :SoapHeader
  {
    public string UserName
    {
      get;
      set;
    }
    public string PWD
    {
      get;
      set;
    }
  }
  /// <summary>
  /// MyMath 的摘要说明
  /// </summary>
  [WebService(Namespace = "http://tempuri.org/")]
  [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
  [System.ComponentModel.ToolboxItem(false)]
  // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
  // [System.Web.Script.Services.ScriptService]
  public class MyMath : System.Web.Services.WebService
  {
    public MySoapHeader sHeader;
    [WebMethod]
    public string HelloWorld()
    {
      return "Hello World";
    }
    [WebMethod]
    [SoapHeader("sHeader")]
    public string add(int x, int y)
    {
      if (sHeader.UserName == "test" && sHeader.PWD == "test")
      {
        return (x + y).ToString();
      }
      else
      {
        return null;
      }
    }
  }
}

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3. Disadvantage analysis:

(1) Service logic and user permission verification logic are mixed, increasing the program size Understand complexity.
(2) Permission logic is not reusable

2. Method based on the "SoapExtensionAttribute" feature

1. Overview of SoapExtensionAttribute and SoapExtension

SoapExtension and SoapExtensio. The two Attribute classes are used to control the general process of serialization and deserialization of webservice, and can control functions such as compression and logging of webservice.

2. Implementation code

using System;
 
using System.Collections.Generic;
 
using System.Linq;
 
using System.Web;
 
using System.Web.Services;
 
using System.Web.Services.Protocols;
 
namespace XMLClass1.class15.content
 
{
 
  [AttributeUsage(AttributeTargets.Method)]
 
  public class MyExtensionAttribute : SoapExtensionAttribute
 
  {
 
    int _priority = 1;
 
    public override int Priority
 
    {
 
      get { return _priority; }
 
      set { _priority = value; }
 
    }
 
    public override Type ExtensionType
 
    {
 
      get { return typeof(MyExtension); }
 
    }
 
  }
 
  public class MyExtension : SoapExtension
 
  {
 
    //这个override的方法会被调用四次
 
    //分别是SoapMessageStage BeforeSerialize,AfterSerialize,BeforeDeserialize,AfterDeserialize
 
    public override void ProcessMessage(SoapMessage message)
 
    {
 
      if (message.Stage == SoapMessageStage.AfterDeserialize)//反序列化之后处理
 
      {
 
        bool check = false;
 
        foreach (SoapHeader header in message.Headers)
 
        {
 
          if (header is MySoapHeader)
 
          {
 
            MySoapHeader myHeader = (MySoapHeader)header;
 
            if (myHeader.Name == "admin" || myHeader.PassWord == "admin")
 
            {
 
              check = true;
 
              break;
 
            }
 
          }
 
        }
 
        if (!check)
 
          throw new SoapHeaderException("认证失败", SoapException.ClientFaultCode);
 
      }
 
    }
 
    public override Object GetInitializer(Type type)
 
    {
 
      return GetType();
       }
 
    public override Object GetInitializer(LogicalMethodInfo info, SoapExtensionAttribute attribute)
 
    {
 
      return null;
 
    }
 
    public override void Initialize(Object initializer)
 
    {
 
    }
 
  }
 
  public class MySoapHeader : SoapHeader
 
  {
 
    string _name;
 
    string _passWord;
 
    public string Name
 
    {
 
      get { return _name; }
 
      set { _name = value; }
 
    }
 
    public string PassWord
 
    {
 
      get { return _passWord; }
 
      set { _passWord = value; }
 
    }
 
  }
 
  /// <summary>
 
  /// headersoap2 的摘要说明
 
  /// </summary>
 
  [WebService(Namespace = http://tempuri.org/)]
 
  [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
 
  [System.ComponentModel.ToolboxItem(false)]
 
  // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
 
  // [System.Web.Script.Services.ScriptService]
 
  public class headersoap2 : System.Web.Services.WebService
 
  {
 
     public MySoapHeader header;
 
    [WebMethod]
 
    [MyExtensionAttribute]
 
    [SoapHeader("header", Direction = SoapHeaderDirection.In)]
 
    public string CheckHeader()
 
    {
 
      //业务逻辑.
 
      return "Something done";
 
    }
 
  }
}

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