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  • Committer: Bazaar Package Importer
  • Author(s): Matthias Klose
  • Date: 2006-01-16 19:56:10 UTC
  • mfrom: (1.1.3 upstream)
  • Revision ID: james.westby@ubuntu.com-20060116195610-ykmxbia4mnnod9o2
Tags: 2.1.0-0ubuntu2
debian/copyright: Include copyright for python 2.3; some 2.3 files
are included in the upstream tarball, but not in the binary packages.

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doc/historic/2003/pycon/conch/conch
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#!/usr/bin/python2.2
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from slides import Slide, Bullet, SubBullet, URL
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from twslides import Lecture
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lecture = Lecture(
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    "Twisted.Conch: SSH in Python",
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    Slide("Introduction",
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    ),
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    Slide("Other implementations (servers)",
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        Bullet("OpenSSH",
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            SubBullet(URL("http://www.openssh.org")),
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        ),
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        Bullet("FSecure SSH",
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            SubBullet(URL("http://www.f-secure.com/products/ssh/")),
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        ),
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        Bullet("LSH",
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            SubBullet(URL("http://www.lysator.liu.se/~nisse/lsh/")),
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        ),
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    ),
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    Slide("Other implementations (clients)",
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        Bullet("PuTTY",
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            SubBullet(URL("http://www.chiark.greenend.org.uk/~sgtatham/putty/")),
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        ),
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        Bullet("TeraTerm",
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            SubBullet(URL("http://www.ayera.com/teraterm/")),
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        ),
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        Bullet("MindTerm",
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            SubBullet(URL("http://www.appgate.com/mindterm/")),
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        ),
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    ),
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    Slide("Why Twisted?",
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        Bullet("Asynchronous"),
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        Bullet("Python"),
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        Bullet("High-Level"),
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    ),
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    Slide("No Forking or Threads",
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        Bullet("Forking is expensive"),
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        Bullet("Threads are complicated/expensive, esp. in Python"),
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        Bullet("Asynch means no worrying about any of that"),
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        Bullet("Makes running a session 2x as fast in Conch as in OpenSSH"),
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    ),
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    Slide("Security - No Pointers",
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        SubBullet("No buffer overflows"),
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        SubBullet("No off-by-1 errors"),
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        SubBullet("No malloc/free bugs"),
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        SubBullet("No arbitrary code execution"),
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    ),
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    Slide("Security - High Level",
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        Bullet("Strong built-in library"),
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        Bullet("Exceptions"),
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    ),
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    Slide("Security - Not Root",
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        Bullet("Limits vulnerablity in a compromise"),
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        Bullet("Allows use of process limits/etc."),
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    ),
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    Slide("Interfacing with other software",
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        Bullet("OpenSSH interacts only through separate processes",
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            SubBullet("Expensive"),
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            SubBullet("Complicated"),
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        ),
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        Bullet("Conch can interact in-process",
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            SubBullet("Faster"),
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            SubBullet("Easy integration to other Twisted and Python libraries"),
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        ),
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    ),
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    Slide("Speed",
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        Bullet("C is faster than Python"),
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        Bullet("Interpreter cost is high for the client"),
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        Bullet("FSH-style connection caching helps a bit"),
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        Bullet("Psyco helps as well"),
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    ),
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    Slide("Age",
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        Bullet("Conch is new",
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            SubBullet("First commit was July 15, 2002"),
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        ),
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        Bullet("Hasn't had a security aduit"),
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        Bullet("Shouldn't be used in security-critical systems"),
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    ),
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    Slide("Applications with Conch",
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        Bullet("Reality: MUD framework"),
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        Bullet("Insults: async. replacement for curses in Conch apps"),
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    ),
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    Slide("Future Directions",
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        Bullet("Generic authentication forwarding"),
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        Bullet("Work on applications"),
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        Bullet("Auditing of the code"),
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        Bullet("Increase speed"),
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        Bullet("SFTP/SCP"),
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        Bullet("Key Agent"),
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        Bullet("DNSSEC"),
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    ),
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    Slide("Conclusion",
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        Bullet("Working implementation in Python"),
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        Bullet("Much room for improvement"),
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    ),
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)
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lecture.renderHTML(".", "conch-%d.html", css="main.css")