gencode128.dll c# Accepting tokens from ACS in C#.NET

Creating Code 128 in C#.NET Accepting tokens from ACS

17.3.3 Accepting tokens from ACS
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You ll need to upgrade the service so it can receive and work with ACS tokens. This code is fairly trivial, and much of it is supplied in the AppFabric SDK, which you ll have to install in order to follow these next steps. You can find the SDK on the Azure portal. It also includes several tools that we ll look at in the next section. Exactly how you get the token and where you process it might change, depending on your business situation and system architecture, but the steps will be generally the same. The first step is to grab the token from the incoming message. The token will usually be included in the header as an authorization entry. In some situations, it can also be in the URL or in the body of the message, depending on the capabilities of the client. Exactly how you grab this header will differ based on how you re receiving the message. In WCF it s best to do this in a custom ServiceAuthorizationManager class that s added to the WCF pipeline when you set up the channel. Every message will flow through this class, and there you can make a decision about whether to let it through or deny it access. In a normal WCF service, you need to use the WebOperationContext to retrieve the header from the request:
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string authorizationHeader = WebOperationContext.Current.IncomingRequest.Headers [HttpRequestHeader.Authorization];
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This code will get the raw header. You now need to do a few things to make sure this token is valid, and then you can use it to make decisions. The SDK has all the sample code you need to build a class called TokenValidator. We ve included a refactored version of this class in the chapter s sample code that s a little easier to use. The validator will do a series of checks for you, and if they all pass, it ll return true. If the validation fails, the validator will deny access.
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validator = new ACSTokenValidator("dqSsz5enDOFjUvUnrUe5p1ozEkp1ccAfUFyuYpawGW0=", "StringReversalInc", "http://localhost/stringservice"); if (!validator.ValidateAuthorizationHeader(authorizationHeader)) DenyAccess();
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To initialize the validator, you need to pass in three pieces of information: The signing key The ACS namespace to check against The URL of the service the message was sent to
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Example: A return to our string-reversing service
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You re passing in the key, the namespace you set up, called StringReversalInc, and the URL of the service you re protecting, http://localhost/stringservice. You then call the ValidateAuthorizationHeader on the header you pulled off the message. If this returns false, you ll deny access by calling a simple little method, DenyAccess, that sets up the deny message:
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private static void DenyAccess() { WebOperationContext.Current.OutgoingResponse.StatusCode = HttpStatusCode.Unauthorized; WebOperationContext.Current.OutgoingRequest.Headers.Add("WWW Authenticate", "WRAP"); }
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That s all you need to receive the header. Most of the work involves making sure it s a valid header and something you can trust. This is the same job the bouncer at the bar does, when he looks at your driver s license to make sure it s a real license and hasn t been tampered with.
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17.3.4 Checking the token
We ve put all of the token-checking logic into the ACSTokenValidator class, and we ve just discussed how to new up a validator. The validator includes some custom methods, namely Validate and IsHMACValid. When you pass in the header, the validator will verify several aspects of it to make sure it s valid. All of these checks test for the negative; if the test passes, you have a bad token and the validator returns false. Table 17.1 summarizes the checks that we do in the code.
Table 17.1 Validation checks performed on a token Check to be made string.IsNullOrEmpty(authHeader) !authHeader.StartsWith("WRAP ") nameValuePair[0] != "access_token" Purpose Makes sure you received a header. Ensures the header starts with WRAP. Checks that there are two pieces to the header, and that the first is equal to access_token. Checks that the second piece starts and ends with a slash. Grabs the token part of the header and makes sure it s valid. Makes sure the token has been signed properly. If this is correct, you know who sent it. Checks that the token hasn t expired. Tokens are vulnerable to replay attacks, so this is important.
!nameValuePair[1].StartsWith("\"") || !nameValuePair[1].EndsWith("\"")) !Validate(GetTokenFromHeader(authHeader))
IsHMACValid(token, signingKey)
this.IsExpired(token)
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