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CHAPTER 6 TLS AND SSL
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the defaults for the wrap_socket() call in the Standard Library is if you need to speak to browsers or other third-party clients that might not have upgraded to full-fledged TLS yet.
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When adding cryptography to your application, it is always a good idea to read up-to-date documentation. The advice given in this chapter would have been quite different if this revision of the book had happened even just one or two years earlier, and in two or three more years it will doubtless be out of date. In particular, the idea has been around for a long time in the public-key cryptography literature that there should exist certificate revocation lists, where client certificates and even certificate-authority certificates could be listed if they are discovered to have been compromised and must no longer be trusted. That way, instead of everyone waiting for operating system updates or browser upgrades to bring the news that an old CA certificate should no longer be trusted, they could instantly be protected against any client certificates minted with the stolen private key. Also, security vulnerabilities continue to be discovered not only in particular programs but also in the design of various security protocols themselves SSL version 2 was, in fact, the victim of just such a discovery in the mid-1990s, which is why many people simply turn it off as an option when using TLS. All of which is to say: use this chapter as a basic API reference and introduction to the whole topic of secure sockets, but consult something more up-to-date if you are creating new software more than a year after this book comes out, to make sure the protocols still operate well if used as shown here. As of this writing, the Standard Library documentation, Python blogs, and Stack Overflow questions about cryptography are all good places to look.
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Computer security is a large and complicated subject. At its core is the fact that an intruder or troublemaker will take advantage of almost any mistake you make even an apparently very small one to try to leverage control over your systems and software. Networks are the locus of much security effort because the IP protocols, by default, copy all your information into packets verbatim, where it can be read by anyone watching your packets go past. Passive sniffing, man-in-the-middle attacks, connection hijacking, and replay attacks are all possible if an adversary has control over the network between a client and server. Fortunately, mathematicians have invented public-key cryptography, which has been packaged as the TLS protocol for protecting IP sockets. It grew out of an older, less secure protocol named SSL, from which most software libraries that speak TLS take their name. The Python Standard Library now supplies an ssl package (though it has to be downloaded separately for Python 2.5), which can leverage the OpenSSL library to secure your own application sockets. This makes it impossible for a third party to masquerade as a properly certified server machine, and also encrypts all data so that an observer cannot determine what your client and server programs are saying to one another. There are two keys to using the ssl package. First, you should always wrap the bare socket you create with its wrap_socket() function, giving the right arguments for the kind of connection and certificate assurances that you need. Second, if you expect the other side to provide a certificate, then you should run match_hostname() to make sure that they are claiming the identity that you expect. The security playing field shifts every few years, with old protocols obsoleted and new ones developed, so keep abreast of news if you are writing security-sensitive applications.
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