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From j...@apache.org
Subject svn commit: r1330176 - in /ace/site/trunk/content/dev-doc/design: ace-authentication.mdtext auth_api.svg auth_connectionfactory.svg auth_main_components.svg
Date Wed, 25 Apr 2012 09:50:29 GMT
Author: jawi
Date: Wed Apr 25 09:50:28 2012
New Revision: 1330176

URL: http://svn.apache.org/viewvc?rev=1330176&view=rev
Log:
Added a WiP article on authentication.

Added:
    ace/site/trunk/content/dev-doc/design/ace-authentication.mdtext   (with props)
    ace/site/trunk/content/dev-doc/design/auth_api.svg   (with props)
    ace/site/trunk/content/dev-doc/design/auth_connectionfactory.svg   (with props)
    ace/site/trunk/content/dev-doc/design/auth_main_components.svg   (with props)

Added: ace/site/trunk/content/dev-doc/design/ace-authentication.mdtext
URL: http://svn.apache.org/viewvc/ace/site/trunk/content/dev-doc/design/ace-authentication.mdtext?rev=1330176&view=auto
==============================================================================
--- ace/site/trunk/content/dev-doc/design/ace-authentication.mdtext (added)
+++ ace/site/trunk/content/dev-doc/design/ace-authentication.mdtext Wed Apr 25 09:50:28 2012
@@ -0,0 +1,193 @@
+_Enabling authentication in ACE_
+
+last updated: April 24th, 2012
+
+
+## Introduction
+
+When provisioning software (partly) to targets, one has to rely upon the trustworthiness of both the network and the target. Even if everything is under your control and governance, one cannot entirely be sure that unwanted access takes place. A first step in order to prevent unwanted access is *authentication*, which gives you the ability to verify the identity of someone. Once the identity is known, one can apply *authentication* in order to determine what actions are allowed and which are not.
+In this article, the recently added authentication layer of ACE is explained in more depth, and some details on how extensions can be written for additional mechanisms are given. The remainder of this article assumes the reader has basic knowledge of the principles behind ACE, and has sufficient programming skills. For this article, the latest code of ACE (0.8.1-SNAPSHOT, rev.1329269) was used.
+
+
+## Communication paths
+
+Before going in more depth on the authentication layer of ACE, we first need to pinpoint all places were authentication is to be applied. The following figure shows the main components in ACE and their communication paths, providing a global overview of where authentication is applicable to ACE.
+
+![Figure 1: Overview of components and communication paths in ACE](auth_main_components.svg "Figure 1: Overview of components and communication paths")
+
+In figure 1, several communication paths exists (denoted by the circled digits):
+
+1. the client communicates to the server by means of both direct calls to its services as well as remoted calls (by means of HTTP[^1]);
+2. a management agent (representing the target) communicates to the management server through HTTP calls;
+3. the REST API exposes the entire client API in a RESTful way. Communication to the client occurs by both direct calls as well as through HTTP;
+4. the Vaadin Web UI exposes the entire client API as web application. Similar as the REST API, it communicates both directly as through HTTP with the client.
+
+As can be seen from the above figure, most of the communication paths are based on HTTP. The reason for this is twofold:
+
+1. It allows reuse of components; for example access to the OBR-servlet is used by the both the client-API as well the web UI to upload new artifacts;
+2. it allows components to be deployed on different machines; for example, one does not need to run the client on the same machine as the server. This could be useful for working on high-latency networks.
+
+All direct communication paths do not need to be authenticated, as they require that both caller and callee run in the same virtual machine, making it impossible to be used outside the virtual machine[^2]. Hence, we only need to add an authentication layer to the HTTP endpoints. However, adding authentication to all HTTP endpoints poses us with the challenge to let the internal communication paths that rely on HTTP to authenticate themselves as well. Not doing so would prevent ACE from functioning correctly. A disadvantage of this approach is that it is an all-or-nothing approach, either all users of the HTTP endpoints use authentication, or none of them. However, the way users authenticate themselves can be different, meaning that one set of users can use HTTP basic authentication to identify themselves, while another set uses client certificates to identify themselves.
+
+
+## Authentication design
+
+The high-level design for security in ACE is explained in the [remote interface design](/dev-doc/design/remote-interfaces.html). From this design, we can derive several requirements for the design of ACE's authentication layer:
+
+1. should be applicable and configurable for all remoted endpoints. If a new endpoint is added to ACE, it should be easy to add and configure authentication for it;
+2. should be optional. If no authentication is desired, one should be able to remove its services from the ACE distribution;
+3. should be pluggable. Various ways of authentication exist, and new ones can emerge. Making the authentication mechanism pluggable allows new ways of authentication to be used easily.
+
+Based on these requirements, the design of the authentication layer is represented in the following figure:
+
+![Figure 2: Authentication layer class diagram](auth_api.svg "Figure 2: Authentication layer class diagram")
+
+The `AuthenticationService` is responsible for authenticating a user based on some piece of information. This piece of information can be a username/password combination, a `HttpServletRequest` containing authentication request headers, or any other set of information capable of uniquely identifying a user. The actual authentication itself is delegated to one or more `AuthenticationProcessor`s, which know how to handle  a given set of information (e.g., `HttpServletRequest`) and can map this information to a particular user. In more detail, the calling sequence of `AuthenticationService#authenticate` would be:
+
+1. `AuthenticationService#authenticate` is called with a blob of data, for example the `HttpServletRequest`;
+2. for each known `AuthenticationProcessor`:
+    - `AuthenticationProcessor#canHandle` is called with that blob of data. An authentication processor can decide whether the given blob is something it can handle or not;
+    - if it can be handled, the `AuthenticationProcessor#authenticate` is called with that blob of data, along with an instance of the UserAdmin service. The authentication processor is now responsible for converting the blob of data to an authenticated user, if possible.
+3. if a `User` object is returned from the authentication service[^3], the authentication phase will be regarded as successful. If *no* `User` object is returned, the authentication phase will be regarded unsuccessful.
+
+This is only half the story for authentication. As stated before, ACE internally also communicates through HTTP to access certain services. Without any changes, all those remote calls will fail due to missing credentials. If we want to leave those means of communications as-is, we would need to track down all places where remote calls are being made and inject the proper credentials at those places. However, doing this is not only *very* invasive and error prone but also not very developer friendly from a service-oriented perspective. Alternatively, we could try to include the credentials in the URL itself, making it self-contained. Not only would this approach limit our ability to use any kind of authentication mechanism (it only works for username/password combos), it also required us to supply the credentials manually each and every time we want to create a remote connection. Instead, we would like to refrain from passing around credentials, and leverage the service orien
 ted aspects of OSGi to create remote connections for us. This service could then be responsible for adding the right credentials for us, leaving the calling party totally unaware about the fact authentication might be used. Such a service is denoted in the following figure:
+
+![Figure 3: Connection Factory class diagram](auth_connectionfactory.svg "Figure 3: Connection Factory class diagram")
+
+The `ConnectionFactory` is responsible for creating `URLConnection`s, given a "plain" URL. So, instead of calling `URL#openConnection()` or `URL#openStream()`, we'll now have to call `ConnectionFactory#createConnection(url)` instead. But, what advantage does this bring us? In order to allow the connection factory to supply the credentials to `URLConnection`s, it is also registered as `ManagedServiceFactory` that enables us to provide multiple configurations of which credentials should be supplied to what (sets of) URLs. The introduction of the connection factory allows us to abstract the creation of a connection and passing of credentials to it from the URL. Internally, the connection factory will match each URL given in `createConnection` with the URLs it is configured with. If a matching URL is found, it will use the credentials in that configuration to supply to the `URLConnection`.
+
+We've now closed the circle: we not only have defined how remote endpoints can apply authentication, but also how all calling parties can remain using these remote endpoints without having to be aware of authentication. 
+
+
+## Configuring authentication
+
+Before continuing on the details of configuring authentication for ACE, we first identify what remote services are available, and how they can be configured.
+
+### Remote services
+
+All remote services in ACE are configurable with respect to the endpoint they can be accessed. The following table shows an overview of the remote services, including the default endpoint they use:
+
+Name | Description | Default endpoint | Configuration PID
+------- | --------------- | --------------------- | --------------------- 
+`BundleServlet` | provides access to the OBR (bundle repository) of ACE | `/obr` | `org.apache.ace.obr.servlet`
+`DeploymentServlet` | handles the actual provisioning of deployment packages to a target | `/deployment` |`org.apache.ace.deployment.servlet`
+`LogServlet` | allows any number of logs for a target to be synchronized and accessed | `/auditlog`[^4] | `org.apache.ace.server.log.servlet.factory`<br/>**note: this is a configuration factory!**
+`RepositoryServlet` | provides access to the various (artifact/feature/distribution/target) internal repositories of ACE | `/repository` | `org.apache.ace.repository.servlet.RepositoryServlet`
+`RepositoryReplicationServlet` | allows *relay nodes* to replicate the internal repositories of ACE | `/replication` | `org.apache.ace.repository.servlet.RepositoryReplicationServlet`
+`RESTClientServlet` | provides the RESTful interface to ACE |`/client` | `org.apache.ace.client.rest`
+`VaadinServlet` | provides the Vaadin web interface | `/ace` | `org.apache.ace.webui.vaadin`
+
+### Configuring authentication for remote services
+
+In the section on the design of the authentication layer, we've mentioned that if a remote service wants to make use of authentication, it can make use of the `AuthenticationService`. However, one of the design requirements was that authentication should be optional as well. In order to enable or disable authentication, each remote service needs to do the following:
+
+1. add a **mandatory** configuration property `authentication.enabled = false|true` to their configuration. Although any kind of name for this configuration property can be used, it is *strongly* advised to stick to the same name for all services;
+2. when the configuration of a remote service is updated, it should add a service dependency to the `AuthenticationService`. By making this service *required* when authentication is enabled, and *optional* when authentication is disabled, we can adhere to the requirement of optionality for authentication;
+3. in case authentication is *enabled*, each request the service obtains needs to be passed to the `AuthenticationService` first, and depending on its outcome, the request can continue or not.
+
+To make this more concrete, an example of how the `BundleServlet` is to be configured:
+
+#### Service configuration
+
+The service configuration, located in `org.apache.ace.obr.servlet.cfg`, looks like:
+
+    # Endpoint for this servlet
+    org.apache.ace.server.servlet.endpoint=/obr
+    # Whether or not authentication is to be used
+    authentication.enabled = true
+
+In `BundleServlet` we add the following code:
+
+    private volatile boolean m_useAuth;
+    private volatile AuthenticationService m_authService;
+    
+    // ...
+    
+    public void updated(Dictionary settings) throws ConfigurationException {
+        if (settings != null) {
+            String useAuthString = (String) settings.get("authentication.enabled");
+            if (useAuthString == null || !("true".equalsIgnoreCase(useAuthString) || "false".equalsIgnoreCase(useAuthString))) {
+                throw new ConfigurationException("authentication.enabled", "Missing or invalid value!");
+            }
+            boolean useAuth = Boolean.parseBoolean(useAuthString);
+
+            m_useAuth = useAuth;
+        }
+        else {
+            m_useAuth = false;
+        }
+    }
+    
+    // ...
+    
+    /**
+     * Called by Dependency Manager upon initialization of this component.
+     */
+    protected void init(Component comp) {
+        comp.add(m_dm.createServiceDependency()
+            .setService(AuthenticationService.class)
+            .setRequired(m_useAuth)
+            .setInstanceBound(true)
+            );
+    }
+
+As almost all of the services in ACE are managed by the Dependency Manager, we can leverage its dynamics to inject our `BundleServlet` with an instance of the `AuthenticationService` and provide us with a configuration[^5]. 
+
+#### Implemention
+
+The actual authentication implementation itself is rather trivial: we simply intercept all incoming requests in our servlet and verify whether it resolves to a valid user:
+
+    @Override
+    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        if (!authenticate(req)) {
+            // Authentication failed; don't proceed with the original request...
+            resp.sendError(SC_UNAUTHORIZED);
+        } else {
+            // Authentication successful, proceed with original request...
+            super.service(req, resp);
+        }
+    }
+    
+    private boolean authenticate(HttpServletRequest request) {
+        User user = null;
+        if (m_useAuth) {
+            User user = m_authService.authenticate(request);
+        }
+        if (user == null) {
+            m_log.log(LogService.LOG_INFO, "Authentication failure!");
+        }
+        return (user != null);
+    }
+
+Note that this implementation does not tell *how* the authentication should occur, only that it should occur. How the authentication is performed, is determined internally by the `AuthenticationService`, with the help of the registered `AuthenticationProcessor`s.
+
+### Configuring the connection factory
+
+Now that the remote service itself is no longer accepting unauthenticated requests, we need to supply the credentials to access this service to the `ConnectionFactory` service. This service can be configured using the PID `org.apache.ace.connectionfactory` (*note that it is a configuration factory!*), which would result in the following configuration for accessing our `BundleServlet`:
+
+    # What kind of authentication should we supply
+    authentication.type = basic
+    # The actual credentials for basic authentication
+    authentication.user.name = d
+    authentication.user.password = f
+    # What is the base URL that these credentials apply to:
+    authentication.baseURL = http://localhost:8080/obr/
+
+When this configuration is supplied to the `ConnectionFactory`, it will provide a basic HTTP authentication header to each connection created for any URL starting with "http://localhost:8080/obr/"[^6]. 
+
+### Configuring the management agent
+
+…
+
+
+[^1]: Other communication protocols could be used as well. However, currently, only HTTP is natively supported by ACE. For the remainder of this article, we'll assume HTTP as protocol.
+
+[^2]: Assuming that all components in the management server are trusted and obtained from trusted sources. If untrusted components would be allowed, we need to add authentication to these communication paths as well.
+
+[^3]: It is up to the implementation of `AuthenticationService` whether the *first* found user is returned, or whether it checks if all authentication processors yield the *same* user, or any other strategy that is desired.
+
+[^4]: Amongst others, any number of log-endpoints can be defined, at least one is needed for the audit log to be synchronized between target and management server.
+
+[^5]: Note that we're using a configuration dependency for this service. This way, the configuration **must** be present before the service itself is registered, which allows us to determine if authentication should be used or not.
+
+[^6]: Currently, a simple `String#startsWith()` is used to determine whether or not a URL matches a configuration. This might change in the future when a more sophisticated URL-matching strategy is needed.

Propchange: ace/site/trunk/content/dev-doc/design/ace-authentication.mdtext
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    svn:eol-style = native

Added: ace/site/trunk/content/dev-doc/design/auth_api.svg
URL: http://svn.apache.org/viewvc/ace/site/trunk/content/dev-doc/design/auth_api.svg?rev=1330176&view=auto
==============================================================================
--- ace/site/trunk/content/dev-doc/design/auth_api.svg (added)
+++ ace/site/trunk/content/dev-doc/design/auth_api.svg Wed Apr 25 09:50:28 2012
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==============================================================================
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Propchange: ace/site/trunk/content/dev-doc/design/auth_connectionfactory.svg
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+Provides a web interface</text>
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+for the entire client-API.</text>
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