C#、VB.NET使用HttpWebRequest访问https地址(SSL)的实现

 

今天，有个网友问我：

用httpwebrequest访问一个SSL类型的地址 https://xxxx 时，报错 “未能为 SSL/TLS 安全通道建立信任关系(Could not establish trust relationship for the SSL/TLS secure channel)”

查了下MSDN，找到了解决方法，SSL网站，连接时需要提供证书，对于非必须提供客户端证书的情况，只要返回一个安全确认 即可。但是此方法的实现，在.NET 1.1 和 .NET 2.0 下是不同的，下面写出2个framework版本下的实现方法：

使用的命名空间：

using 
System
.
Net
;

using 
System
.
Net
.
Security
;

using 
System
.
Security
.
Authentication
;

using 
System
.
Security
.
Cryptography
.
X509Certificates
;

.Net 2.0

public 
bool 
CheckValidationResult
(
object 
sender
, 
X509Certificate certificate
, 
X509Chain chain
, 
SslPolicyErrors errors
)
{   
    
//直接确认，否则打不开   
    
return 
true
;
}
    

private void 
button1_Click
(
object 
sender
, 
EventArgs 
e
)
{

    ServicePointManager
.
ServerCertificateValidationCallback 
= 
new 
System
.
Net
.
Security
.
RemoteCertificateValidationCallback
(
CheckValidationResult
);

    HttpWebRequest 
req 
= (
HttpWebRequest
)
WebRequest
.
CreateDefault
(
new 
Uri
(
"https://zu14.cn/"
));

    req
.
Method 
= 
"GET"
;

    HttpWebResponse 
res 
= (
HttpWebResponse
)
req
.
GetResponse
();

    //...正常使用了，和访问普通的 http:// 地址一样了

}

 

.Net 1.1

internal 
class 
AcceptAllCertificatePolicy : ICertificatePolicy

{
    
public 
AcceptAllCertificatePolicy
()
    {
    }

    
public 
bool 
CheckValidationResult
(
ServicePoint sPoint
, 
System
.
Security
.
Cryptography
.
X509Certificates
.
X509Certificate cert
, 
WebRequest wRequest
, 
int 
certProb
)
    {
        
//直接确认
        
return 
true
;
    }
} 
    

private void 
button1_Click
(
object 
sender
, 
EventArgs 
e
)
{

    ServicePointManager
.
CertificatePolicy 
= 
new 
AcceptAllCertificatePolicy()
;

    HttpWebRequest 
req 
= (
HttpWebRequest
)
WebRequest
.
CreateDefault
(
new 
Uri
(
"https://zu14.cn/"
));

    req
.
Method 
= 
"GET"
;

    HttpWebResponse 
res 
= (
HttpWebResponse
)
req
.
GetResponse
();

    //...正常使用了，和访问普通的 http:// 地址一样了

}