Session management

WebSphere Commerce supports two types of session management: cookie-based and URL rewriting.

The administrator can choose to support either only cookie-based session management or both cookie-based and URL rewriting session management. If WebSphere Commerce supports only cookie-based session management, customers' browsers must be able to accept cookies. If both cookie-based and URL rewriting are selected, WebSphere Commerce first attempts to use cookies to manage sessions. If the customer's browser is set to not accept cookies, then URL rewriting is used.

Cookie-based session management

When cookie-based session management is used, a message (cookie) containing user's information is sent to the browser by the web server. This cookie is sent back to the server when the user tries to access certain pages. The cookie allows the server to identify the user and retrieve the user's session from the session database, so that the user’s session is maintained. A cookie-based session ends when the user logs off or closes the browser. Cookie-based session management is secure and has performance benefits. Cookie-based session management is secure because it uses an identification tag that flows only over SSL. Cookie-based session management offers significant performance benefits because the WebSphere Commerce caching mechanism supports only cookie-based sessions, and not URL rewriting. Cookie-based session management is recommended for customer sessions.

If you are not using URL rewriting and you want to ensure that users enable cookies on their browsers, check Cookie acceptance test on the Session Management page of Configuration Manager. When you select this option, customers are informed that if their browser does not support cookies, or if they disabled cookies, they need a browser that supports cookies to browse the WebSphere Commerce site.

For security reasons, cookie-based session management uses two types of cookies:

• Non-secure session cookie
  Used to manage session data. Contains an activity identifier that points to attributes such as the negotiated language, current store, and customer's preferred currency at the time the cookie is constructed. This cookie can flow between the browser and server under either SSL or non-SSL connection. There are two types of non-secure session cookies:

  • A WebSphere Application Server session cookie is based on the servlet HTTP session standard. WebSphere Application Server cookies persist to memory or to the database in a multinode deployment. For more information, see the Session management support topic.
  • A WebSphere Commerce session cookie is internal to WebSphere Commerce and does not persist to the database. All the cookies persist to memory except the persistent cookie. This configuration is the default. This configuration is required if URL rewriting is enabled.

  To select which type of cookie to use, select WCS or WAS for the Cookie session manager parameter on the Session Management page of Configuration Manager.

• Secure authentication cookie

  Used to manage authentication data. An authentication cookie flows over SSL and is time-stamped for maximum security. This cookie is used to authenticate the user whenever a sensitive command is run. For example, the DoPaymentCmd, which asks for a user's credit card number. There is minimal risk that this cookie might be stolen and used by an unauthorized user. Authentication code cookies are always generated by WebSphere Commerce whenever cookie-based session management is in use.

Both the session and authentication code cookies are required to view secure pages.

For cookie errors, the CookieErrorView is called:

• When the user logs in from another location with the same Logon ID, and multiple logon is not enabled.
• When the cookie is corrupted, tampered with, or both.
• If cookie acceptance is set to true and the user's browser does not support cookies.

URL rewriting

WebSphere Commerce dynamic caching and URL rewriting cannot interoperate. If URL rewriting is enabled, then disable WebSphere Commerce dynamic caching.

With URL rewriting, all links that are returned to the browser or that get redirected have the session ID appended to them. When the user clicks these links, the rewritten form of the URL is sent to the server as part of the client request. The servlet engine recognizes the session ID in the URL and saves it for obtaining the proper object for this user. To use URL rewriting, HTML files (files with .html or .htm extensions) cannot be used for links. To use URL rewriting, JSP pages must be used for display purposes. A session with URL rewriting expires when the customer logs off.

Because URLs returned to the browser contain session IDs, another user with access to the browser history (for example, on a shared computer) might gain access to sensitive information exchanged during a session - if the session is left active. To prevent such unauthorized access, site developers can add a notice to their site to tell customers to always log off at the end of their visit so that their session ends, particularly on a shared computer.

WebSphere Commerce session cookies

Store-level session management

The following diagram illustrates the WebSphere Commerce store level registration infrastructure and user session management in a multi-store environment. Store level registration uses access control roles to associate a customer with a store.

Store level registration

Users that shop at a store do not necessarily need to be a member of the store organization. However, they must play a shopping role (that is, they must be a Registered Customer) in the organization. Users that play an administrative role in an organization are associated with the organization by having an ancestral relationship with the organization.

For example, suppose that you have a store, Store A as in the preceding diagram. Also, suppose that Sue shops at Store A and Joe is an employee for Store A responsible for the administrative duties of running Store A. To model this scenario from an organizational perspective, Joe belongs under Store A's organization but Sue does not. Because Sue is not an employee of Store A, Sue is associated with Store A because she plays the shopping role in the Store A organization.

A store determines all of its registered customers by finding all the users that play a shopping role in the store organization. A user administrator of the store can then perform store wide activities, such as setting up a campaign for all the registered users in a store. The user administrator of the store can also take specific actions, such as resetting the password of a user that is registered to its store.

Refer to the previous diagram and consider the following scenario:

• Sue, who is a member of the Default Organization, has a shopping role in Reseller A's organization.
• Reseller A's parent organization is the Reseller Organization.
• Reseller A owns store A.
• Sue does not have an organizational role in Reseller B's organization.
• Reseller B owns store B.
• Sue logs in to Store A and shops as usual.
• When Sue accesses Store B, Sue is assigned a new session identity for Store B as a guest user.
• If she accesses Store A again, the information in her previous session identity for Store A is used by WebSphere Commerce to manage her session.
• The session identity for Store A would be reused for Store B if:
  • Store A and Store B belong to the same organization.
  • Sue has a role that is defined in both the Reseller A and Reseller B organizations.

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