WebAPI Security Using token+ signature Verification (bottom)

Web Tutorial: WebAPI Security Using token+ signature Verification (bottom)

Stitching parameters based on request type

NameValueCollection form = HttpContext.Current.Request.QueryString;

String data = String. Empty;

Switch (method)

{

Case "POST":

Stream stream = HttpContext.Current.Request.InputStream;

String Responsejson = String. Empty;

StreamReader StreamReader = new StreamReader (stream);

data = Streamreader.readtoend ();

Break

Case "GET":

First step: Remove all get parameters

IDictionary parameters = new Dictionary ();

for (int f = 0; f < form. Count; f++)

{

String key = form. KEYS[F];

Parameters. ADD (Key, Form[key]);

}

Step two: Sort the dictionary in alphabetical order by key

IDictionary sortedparams = new SortedDictionary (parameters);

Ienumerator> dem = Sortedparams.getenumerator ();

Step three: String all parameter names and values together

StringBuilder query = new StringBuilder ();

while (Dem. MoveNext ())

{

String key = Dem. Current.key;

String value = Dem. Current.value;

if (!string. IsNullOrEmpty (Key))

{

Query. Append (Key). Append (value);

}

}

data = query. ToString ();

Break

Default

resultmsg = new Resultmsg ();

Resultmsg.statuscode = (int) statuscodeenum.httpmehtoderror;

Resultmsg.info = StatusCodeEnum.HttpMehtodError.GetEnumText ();

Resultmsg.data = "";

Actioncontext.response = Httpresponseextension.tojson (Jsonconvert.serializeobject (RESULTMSG));

Base. OnActionExecuting (Actioncontext);

Return

}

BOOL result = Signextension.validate (timestamp, nonce, ID, signtoken,data, signature);

if (!result)

{

resultmsg = new Resultmsg ();

Resultmsg.statuscode = (int) statuscodeenum.httprequesterror;

Resultmsg.info = StatusCodeEnum.HttpRequestError.GetEnumText ();

Resultmsg.data = "";

Actioncontext.response = Httpresponseextension.tojson (Jsonconvert.serializeobject (RESULTMSG));

Base. OnActionExecuting (Actioncontext);

Return

}

Else

{

Base. OnActionExecuting (Actioncontext);

}

}

public override void OnActionExecuted (Httpactionexecutedcontext actionexecutedcontext)

{

Base. OnActionExecuted (ActionExecutedContext);

}

}

Then we test to verify the legality of the API request.

GET Request:

1. Get product data, pass parameter Id=1,name= "Wahaha", complete request is Http://localhost:14826/api/product/getproduct?id=1&name=wahaha

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2. Request Header Add Timespan,staffid,nonce,signature field

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3. When the value in data is Id1namewahaha, the value of the signature in the request header and the result computed by the server side is exactly the same, and when I modify data to ID1NAMEWAHAHA1, The server-side computed signature result and the signature that are submitted in the request header are not the same, and are represented as illegal requests.

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4. Illegal requests will be identified as request parameters have been modified

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POST request:

1.post object is serialized into a JSON string and submitted to the background, back to the corresponding product information

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2. Background get parameter information of request

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3. Determine if the signature is successful, the first request signature parameter signature and the server side of the calculation result is exactly the same, and then when the number of count in the request parameter from 10 to 100 after the server-side calculation of the result and request signature parameters signature different, So the request is illegal, the request is unlawful, similarly, if any other parameter is modified, the result of the calculation will be different from the signature parameter, the request is also recognized as an illegitimate request

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Summarize:

Through the above case, we can see that the key to security is to participate in the signing token, the whole process of token is not involved in communication, so long as the token is not disclosed, the request will not be forged.

We then use the timestamp timestamp to verify that the request is out of date, which is not valid even if the full request link is taken.

Sign signature way to prevent information tampering and forgery to a certain extent, to ensure the security of communications

WebAPI Security Using token+ signature Verification (bottom)