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Authentication and Authorization

Updated: January 7, 2014

Applies To: Service Bus for Windows Server 1.1

Applications can authenticate to Service Bus for Windows Server using either Shared Access Signature (SAS) authentication, or by using Windows integrated security (Active Directory).

  • Shared Access Signature authentication enables applications to authenticate to Service Bus using an access key configured either on the namespace, or on the entity with which specific rights are associated. You can then use this key to generate a Shared Access Signature token that clients can use to authenticate to Service Bus.

  • Windows integrated security supplies the values of domain-joined users and groups. Applications can use their runtime credentials (or other if explicitly used) to be authenticated and authorized. An administrator can define access rules at the level of a Service Bus namespace or entity.

Service Bus for Windows Server includes a simple Service Bus Security Token Service (SBSTS). The SBSTS is integrated with the Windows security model, and can issue Simple Web Tokens (SWTs) based on Windows identities (stored in the local Windows identity store or in Active Directory) or SAS secrets.

SAS provides a simple, flexible, and easy-to-use authentication scheme for Service Bus. Applications can use SAS in scenarios in which they do not need to manage the notion of an authorized “user.”

Applications that require a rich, identity-based authentication model can use Windows integrated security for authenticating with Service Bus.

Clients accessing a service namespace or entity on the Service Bus for Windows Server must acquire a token from the SBSTS for any operation.

noteNote
The default lifetime for the tokens that the SBSTS issues is 20 minutes.

noteNote
Regardless of the authentication and authorization option you select, if you used an auto-generated certificate you must import the root CA to your client machine. For more information, see Exporting Certificates to Client Machines.

For more information about Shared Access Signature, see Shared Access Signature Authentication with Service Bus.

Configure Service Bus Authorization

The SBSTS is part of the Service Bus for Windows Server gateway and runs on each of the Service Bus for Windows Server farm hosts. The SBSTS settings are initialized when the service namespace is created.

Windows Integrated Security Configuration

There are two places in Service Bus for Windows Server to specify authorization rules:

  1. At the Service Bus for Windows Server service namespace level, an administrator specifies a list of users who have manage, send, and receive permissions on all the underlying Service Bus messaging entities (queues, topics, and subscriptions). You can grant these permissions to a security principal (a user or a security group) during creation of the service namespace, and you can modify them later using a PowerShell command. For more information, see the New-SBNamespace and the Set-SBNamespace cmdlets.

  2. At the Service Bus for Windows Server messaging entity level (queue or topic), you can specify authorization rules for that entity. The manage rule controls whether the user can manage permissions as well as create, change, or delete entities. The send rule controls whether the user can send messages to a Service Bus for Windows Server entity, and receive controls whether the user can receive messages from the Service Bus for Windows Server entity. To configure the access rights for an entity, the administrator must configure authorization rules. This action requires the manage permission on the service namespace.

A user with manage permission on the service namespace can then add authorization rules to the entities within the service namespace. For example, once you have created a NamespaceManager instance, you can add the authorization rules when an entity is created, or you can modify them on an existing entity. The following example adds authorization rules when creating a queue:

// Example of allowing a domain group manage and send permissions to a queue
QueueDescription sourceQ = new QueueDescription(sourceQName);
string domainGroup = “MyGroup@" + Environment.GetEnvironmentVariable("USERDNSDOMAIN"); 
AuthorizationRule sourceQRule = new AllowRule("owner", RoleClaimType, domainGroup, new List<string>() {"Manage", "Send" });
sourceQ.Authorization.Add(sourceQRule );

// Example of granting a domain user listen permissions to a queue
string domainUser = “MyUserName@" + Environment.GetEnvironmentVariable("USERDNSDOMAIN");
AuthorizationRule ListenRule = new AllowRule("owner", IdentityClaimType, domainUser, new List<string>() { "Listen" });
sourceQ.Authorization.Add(ListenRule);
namespaceManager.CreateQueue(sourceQ);

This example created a queue (sourceQ) with two authorization rules: granting the group (MYGroup) manage and send permissions, and granting the user (MyUserName) listen permission.

Shared Access Signature (SAS) Configuration

Shared Access Signature rules can be scoped to a Service Bus namespace or entity. For each entity, you can configure up to 12 authorization rules. Using the Service Bus SDK API for SAS rules configuration is similar to setting Windows integrated security rules.

For more information about setting SAS rules programmatically, see How to use Shared Access Signature Authentication with Service Bus.

Service Bus for Windows Server also supports using PowerShell cmdlets for SAS rules management. For more information, see the documentation for the New-SBAuthorizationRule, Set-SBAuthorizationRule, Get-SBAuthorizationRule, and Remove-SBAuthorizationRule cmdlets.

Authorization with the Windows Azure Pack

Windows Azure Pack introduces a management portal for Service Bus in which tenants can define new resources (Service Bus namespaces and messaging entities) using their subscription to the Windows Azure Pack. The management portal supports authorization management for both integrated Windows security as well as SAS. You can define rules on namespaces, queues, and topics. You can also generate connection strings customized for the rules you create, and paste them into the application configuration file.

Using the Service Bus for Windows Server SDK

You can obtain access to a Service Bus entity by obtaining a token from the STS. By default, an $STS used in the Service Bus for Windows Server listens on port 9355.

Clients that use the Service Bus for Windows Server can create a token provider to use with their NamespaceManager and MessagingFactory classes. For example:

stsUris= new List<Uri>() { new Uri(string.Format(CultureInfo.InvariantCulture, 
    "sb://{0}:9355/", <hostname>)) };
TokenProvider tokenProvider = TokenProvider.CreateWindowsTokenProvider(stsUris);

string runtimeAddress = string.Format("sb://{0}:9354/{1}/", <hostname>,  
    <serviceNamespace>);
MessagingFactory messagingFactory = MessagingFactory.Create(runtimeAddress, 
    new MessagingFactorySettings() { TokenProvider = this.tokenProvider, 
    OperationTimeout = TimeSpan.FromMinutes(30) });

In the previous example, replace <hostname> with the name of the server that hosts the Service Bus for Windows Server installation. Replace <serviceNamespace> with the name of the service namespace you want to access.

Subsequent operations using the MessagingFactory object automatically acquire the token through the Microsoft.ServiceBus.TokenProvider object, and include it in all operations. This class also manages the token caching and renewal based on the token expiry time.

Using HTTP

The following example illustrates access token acquisition by using HTTP from the SBSTS, which resides at the $STS address.

public static void Usage()
{
    string token = GetOAuthAccessToken(new 
        Uri("https://<hostname.domain.com>:9355/<namespace> /"), 
        "user@corp.domain. com", "<password>", TimeSpan.FromMinutes(10)); 
}

public static string GetOAuthAccessToken(Uri namespaceBaseAddress, string userName, string userPassword, TimeSpan timeout)
{
    const int ServicePointMaxIdleTimeMilliSeconds = 50000;
    const string OAuthTokenServicePath = "$STS/OAuth/";
    const string ClientPasswordFormat = 
        "grant_type=authorization_code&client_id={0}&client_secret={1}&scope={2}";

    Uri requestUri = new Uri(namespaceBaseAddress, OAuthTokenServicePath);
    string requestContent = string.Format(CultureInfo.InvariantCulture, 
        ClientPasswordFormat, HttpUtility.UrlEncode(userName), 
        HttpUtility.UrlEncode(userPassword), 
        HttpUtility.UrlEncode(namespaceBaseAddress.AbsoluteUri));
    byte[] body = Encoding.UTF8.GetBytes(requestContent);

    HttpWebRequest request = WebRequest.Create(requestUri) as HttpWebRequest;
    request.ServicePoint.MaxIdleTime = ServicePointMaxIdleTimeMilliSeconds;
    request.AllowAutoRedirect = true;
    request.MaximumAutomaticRedirections = 1;
    request.Method = "POST";
    request.ContentType = "application/x-www-form-urlencoded";
    request.ContentLength = body.Length;
    request.Timeout = Convert.ToInt32(timeout.TotalMilliseconds, 
        CultureInfo.InvariantCulture);

    using (Stream requestStream = request.GetRequestStream())
    {
        requestStream.Write(body, 0, body.Length);
    }

    string rawAccessToken = null;
    using (var response = request.GetResponse() as HttpWebResponse)
    {
        using (Stream stream = response.GetResponseStream())
        {
            using (var reader = new StreamReader(stream, Encoding.UTF8))
            {
                rawAccessToken = reader.ReadToEnd();
            }
        }
    }

    string simpleWebToken = string.Format(CultureInfo.InvariantCulture, 
        "WRAP access_token=\"{0}\"", rawAccessToken);
    return simpleWebToken;
}

In this example, you can substitute the hostname, namespace, and username values in the format shown.

In subsequent messages to Service Bus for Windows Server, the client can set the HTTP Authorization header to the token obtained from the call to the GetOAuthAccessToken() method in the previous example.

noteNote
Clients using HTTP are responsible for managing the token caching and renewal based on the token expiry time.

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