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Re: [caplet] SES prototype mostly working on latest Minefield, WebKit, and Chromium betas

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  • Ben Laurie
    ... FWIW, it didn t crash Chrome 5 on Windows. Hard to know if it worked properly, tho! ... -- http://www.apache-ssl.org/ben.html
    Message 1 of 3 , Aug 31, 2010
      On 30/08/2010 23:12, Mark S. Miller wrote:
      > May crash your browser or page:
      > http://es-lab.googlecode.com/svn/trunk/src/ses/index.html

      FWIW, it didn't crash Chrome 5 on Windows. Hard to know if it worked
      properly, tho!

      > <http://es-lab.googlecode.com/svn/trunk/src/ses/index.html>Sources at
      > http://code.google.com/p/es-lab/source/browse/trunk/src/ses/
      > This has only been lightly tested and should */*not*/* be relied on to
      > have any security properties yet.
      > The claim I working up to is that, on a securable ES5 implementation
      > (<http://code.google.com/p/es-lab/wiki/SecureableES5>), these scripts
      > create an SES environment
      > (<http://code.google.com/p/es-lab/wiki/SecureEcmaScript>) implementing
      > the object-capability security model and solving the safe mashup problem
      > (<http://code.google.com/p/es-lab/wiki/SafeMashups>).
      > Unfortunately, since there is not yet any full browser-based
      > implementations of ES5, the present state of these scripts have various
      > compromises that preserves their functionality but loses security. These
      > are documented in the various files under "KLUDGE SWITCHES". With these
      > kludges, from *extremely* light testing, it seems to work on the latest
      > * Firefox Minefield 4.0b5pre,
      > * Safari WebKit Nightly Version 5.0.1 (5533.17.8, r66356), and
      > * Chromium beta 6.0.490.0 (3135).
      > As soon as I get my VMWare installation fixed, I'll test on the IE9
      > preview as well. Opera 10.61.8429 does not yet implement
      > Object.getOwnPropertyNames, so I can't even test there.
      > This implementation of SES cannot run on ES5/3
      > (<http://code.google.com/p/google-caja/wiki/DifferencesBetweenES5Over3AndES5>)
      > as is because of the lack of a client side eval. The current plan is to
      > support SES5/3 directly, rather than porting these scripts to run on ES5/3.
      > Like ADsafe, this is all implemented by a lightweight client-side
      > library, with no server-side support need. Minified, the total size of
      > the download comes in under 5k. Because it does not parse or transform
      > code, aside from calls to "eval" or the "Function" constructor, the
      > untrusted code runs at full speed and with no code expansion. Due to
      > various transient problems, the safe eval is currently called "eval2"
      > and "eval" remains unsafe.
      > Interestingly, this library contains a surprising faithful emulation of
      > WeakMaps on ES5 browsers that don't support WeakMaps directly
      > (<http://code.google.com/p/es-lab/source/browse/trunk/src/ses/WeakMap.js#326>).
      > --
      > Cheers,
      > --MarkM

      http://www.apache-ssl.org/ben.html http://www.links.org/

      "There is no limit to what a man can do or how far he can go if he
      doesn't mind who gets the credit." - Robert Woodruff
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