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The goal of enabling Secure Sockets Layer (SSL) on OHS is to provide assurance that the host server is not being spoofed and to encrypt traffic in and out of the HTTP server Recall the section Encryption 101 from 2, where we discussed public key encryption and symmetric key encryption and mentioned that SSL uses a clever combination of public key and symmetric key encryption to do its thing Here s a quick review of SSL that will help you understand the purpose of the certificate files used to enable SSL: 1 An SSL encrypted session is initiated by a user s Web browser requesting a URL that uses the HTTPS protocol, as in https://wwworaclecom 2 The server then responds with some basic information, such as what ciphers it supports The server also sends its certificate, which includes its public key signed by (the private key) of a known Certificate Authority 3 The server s certificate allows the client to verify that the server is indeed who it claims to be If the user requested https://wwworaclecom, then the certificate should claim www oraclecom to be the name of the server If the certificate claimed a different name say, wwworoclecom a failure, or in the very least, a warning, would appear in the user s browser The actual validation comes because the user s browser uses the public key of the known Certificate Authority to decrypt and validate the server s information If the Certificate Authority is unknown, the user would get a warning or the session would be rejected (depending on how the browser is configured) All of this prevents a nefarious person from pretending to be a legitimate site or redirecting a user from one site to another without the user realizing it 4 The client s browser creates a random symmetric key (or shared secret) that is used later with the symmetric encryption algorithm It also chooses the symmetric encryption algorithm including key size from the list provided by the server 5 If the client is not authenticating itself back to the server, the client then encrypts the symmetric key using the server s public key and sends it back to the server 6 The server then uses its private key to decrypt the symmetric key sent by the client Since only the server is in possession of its private key, only it can decrypt the symmetric key sent by the user s browser This prevents an intermediary person from listening in on the conversation
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Part IV: Applied Security for Oracle APEX and Oracle Business Intelligence
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The first part of the handshake involving the server s public and private keys is called public key cryptography and is computationally more expensive than symmetric key cryptography However, it is the best practical way to encrypt initial communications between the client and server in which a key is not yet shared Once the handshake is complete and they both posses the same shared key, all communication between the client and server uses symmetric key encryption, which is much less expensive Encryption still adds overhead and will reduce the number of concurrent users that a HTTP server can support The reduction in performance by enabling SSL is difficult to estimate, because it depends on many factors, including number and speed of CPUs, number of concurrent users, size of pages and static content, network latency, and OHS settings In the optimal configuration of APEX in which the database and HTTP server are on different servers, the machine running OHS is typically incurring a very small load compared to the database server This is expected, as the bulk of the work of APEX is done inside the database If this is the case for your environment, enabling SSL is not likely to have an impact on performance as the database server is usually the limiting factor The initial handshake is expensive and requires a minimum of five network round trips when compared to a non-SSL HTTP request that requires a minimum of two round trips This could make the first page view substantially slower and is important to consider in environments with high network latency Since OHS is based on Apache, any of the numerous SSL tuning guides for Apache are directly applicable, and SSL tuning is beyond the scope of this book If you plan to have a large number of concurrent users, especially if your applications are on the public Internet, you should consider dedicated hardware solutions to offload the work of SSL encryption For most intranet applications with well defined population of a few thousand users, softwarebased SSL encryption should be more than adequate The two most common scenarios for SSL are either to encrypt all pages in a web application or to encrypt only certain pages All financial institutions, at least those worthy of your trust, require SSL for all pages Online retailers such as Amazon and eBay require SSL for login pages as well as any pages associated with the purchase of goods Web applications that require less security typically use SSL only for login pages Most popular web-based e-mail applications fall into this category If your username and password were intercepted, a hacker could take over your e-mail account, so it s import to protect these requests Due to the additional performance requirements of SSL, discussed earlier, combined with the massive volume of traffic incurred by the most popular web mail applications, encrypting all pages would require a substantial investment in additional hardware As with any changes to your architecture, you should benchmark SSL in your environment with your applications to determine whether the performance penalty is significant Chances are, it won t even be noticeable
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