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第二十六章 添加数字签名 - 示例

第二十六章 添加数字签名 - 示例

示例

此示例显示了对其响应消息进行签名的 Web 服务。

为了使此示例在自己的环境中运行,请首先执行以下操作:

  • 为服务器创建证书。
  • 将此证书加载到服务器端的 IRIS 中,创建名为 servercred 的凭证。执行此操作时,还要加载私钥文件并提供其密码(这样 Web 服务在签署其响应消息时就不必提供该密码。)

Web 服务指的是具有此确切名称的 IRIS 凭证集。

Class DSig.DivideWS Extends %SOAP.WebService
{

///  Name of the Web service.
Parameter SERVICENAME = "DigitalSignatureDemo";

///  SOAP namespace for the Web service
Parameter NAMESPACE = "http://www.myapp.org";

/// use in documentation
Method Divide(arg1 As %Numeric = 2, arg2 As %Numeric = 8) As %Numeric [ WebMethod ]
{
 Do ..SignResponses()
 Try {
  Set ans=arg1 / arg2
  }Catch{
    Do ..ApplicationError("division error")
  }
 Quit ans
}

/// use in documentation
/// signs and includes a binary security token
Method SignResponses()
{
 //Add timestamp because that's commonly done
 Set ts=##class(%SOAP.Security.Timestamp).Create()
 Do ..SecurityOut.AddSecurityElement(ts)

 //access previously stored server certificate & private key file
 //no need to use private key file password, because that has been saved
 Set x509alias = "servercred" 
 Set cred = ##class(%SYS.X509Credentials).GetByAlias(x509alias)
 set bst=##class(%SOAP.Security.BinarySecurityToken).CreateX509Token(cred)
 do ..SecurityOut.AddSecurityElement(bst)

 //Create WS-Security Signature object
 Set signature=##class(%XML.Security.Signature).CreateX509(bst)

 //Add WS-Security Signature object to the outbound message
 Do ..SecurityOut.AddSecurityElement(signature)
 Quit
}


///  Create our own method to produce application specific SOAP faults.
Method ApplicationError(detail As %String)
{
    Set fault=##class(%SOAP.Fault).%New()
    Set fault.faultcode=$$$FAULTServer
    Set fault.detail=detail
    Set fault.faultstring="Application error"
    // ReturnFault must be called to send the fault to the client.
    // ReturnFault will not return here.
    Do ..ReturnFault(fault)
}


}

使用带签名的证书的其他方法

在上一节讨论的基本过程中,使用 <BinarySecurityToken> 包含序列化、base-64 编码格式的证书。除了包含证书之外,还可以使用标识证书的信息。或者,可以将证书包含在签名的 SAML 断言中。本节讨论了这些变体。

变体:使用可识别证书的信息

可以包含标识证书的信息,而不是在邮件中包含证书。收件人使用此信息从适当的位置检索证书。为此,请使用上一节中的步骤,并进行以下更改:

  • 跳过步骤 45。也就是说,不要添加 <BinarySecurityToken>
  • 在步骤 6(创建签名)中,使用步骤 1 中设置的凭证(而不是二进制安全令牌)作为 CreateX509() 的第一个参数。例如:
 set dsig=##class(%XML.Security.Signature).CreateX509(credset,,referenceOption)

对于第三个参数(referenceOption),可以指定<Signature> 元素如何使用证书。

如果指定一个凭据集作为第一个参数(正如我们在此变体中所做的那样),则referenceOption的默认值为$$$SOAPWSReferenceThumbprint。 可选地指定一个值,如X.509凭据的参考选项中所述。 您可以使用除$$$SOAPWSReferenceDirect之外的任何值。

示例

此示例是本主题中先前示例的变体。

Method SignResponses()
{
 //Add timestamp because that's commonly done
 Set ts=##class(%SOAP.Security.Timestamp).Create()
 Do ..SecurityOut.AddSecurityElement(ts)

 //access previously stored server certificate & private key file
 //no need to use private key file password, because that has been saved
 Set x509alias = "servercred" 
 Set cred = ##class(%SYS.X509Credentials).GetByAlias(x509alias)

 //Create WS-Security Signature object
 Set signature=##class(%XML.Security.Signature).CreateX509(cred)

 //Add WS-Security Signature object to the outbound message
 Do ..SecurityOut.AddSecurityElement(signature)
 Quit
}

在这种情况下,Web 服务发送如下响应消息:

<?xml version="1.0" encoding="UTF-8" ?>
<SOAP-ENV:Envelope [parts omitted]>
  <SOAP-ENV:Header>
    <Security xmlns="[parts omitted]oasis-200401-wss-wssecurity-secext-1.0.xsd">
      <Timestamp xmlns="[parts omitted]oasis-200401-wss-wssecurity-utility-1.0.xsd" 
                 wsu:Id="Timestamp-48CEE53E-E6C3-456C-9214-B7D533B2663F">
        <Created>2010-03-19T14:35:06Z</Created>
        <Expires>2010-03-19T14:40:06Z</Expires>
      </Timestamp>
      <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
        <SignedInfo>
          <CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#">
          </CanonicalizationMethod>
            <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha256"></SignatureMethod>
            <Reference URI="#Timestamp-48CEE53E-E6C3-456C-9214-B7D533B2663F">
              <Transforms>
                <Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"></Transform>
              </Transforms>
              <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"></DigestMethod>
                <DigestValue>waSMFeYMruQn9XHx85HqunhMGIA=</DigestValue>
            </Reference>
            <Reference URI="#Body-73F08A5C-0FFD-4FE9-AC15-254423DBA6A2">
              <Transforms>
                <Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"></Transform>
              </Transforms>
              <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"></DigestMethod>
                <DigestValue>wDCqAzy5bLKKF+Rt0+YV/gxTQws=</DigestValue>
            </Reference>
          </SignedInfo>
          <SignatureValue>j6vtht/[parts omitted]trCQ==</SignatureValue>
          <KeyInfo>
            <SecurityTokenReference 
            xmlns="[parts omitted]oasis-200401-wss-wssecurity-secext-1.0.xsd">
              <KeyIdentifier EncodingType="[parts omitted]#Base64Binary" 
                             ValueType="[parts omitted]#ThumbprintSHA1">
                   WeCnU2sMyOXfHH8CHTLjNTQQnGQ=
              </KeyIdentifier>
            </SecurityTokenReference>
          </KeyInfo>
        </Signature>
      </Security>
  </SOAP-ENV:Header>
  <SOAP-ENV:Body wsu:Id="Body-73F08A5C-0FFD-4FE9-AC15-254423DBA6A2">
      [omitted]
  </SOAP-ENV:Body>
</SOAP-ENV:Envelope>
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