Did you know that Adobe's Flash allows web-sites to store information on
your local HDD? I didn't:
http://epic.org/privacy/cookies/flash.html
Here they are:
$ tree ~/.macromedia
/home/roydsd/.macromedia
`-- Flash_Player
|-- #SharedObjects
| `-- UED5REU8
| `-- s.ytimg.com
| `-- soundData.sol
`-- macromedia.com
`-- support
`-- flashplayer
`-- sys
|-- #s.ytimg.com
| `-- settings.sol
`-- settings.sol
I had already cleared my LSOs, so the ones shown here for s.ytimg.com
are only those set by YouTube.
Adobe provide a configure-your-flash-player tool on-line:
http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager02.html#118539
I used it to delete all LSOs. It didn't appear to do so. I set every
option I could find to "get lost", and it didn't stop YouTube setting
LSOs. So, here's the brute-force approach:
Delete existing LSOs:
$ find
~/.macromedia/Flash_Player/macromedia.com/support/flashplayer/sys/
-type d -name \#* | xargs rm -fr
$ rm -fr ~/.macromedia/Flash_Player/#SharedObjects/UED5REU8/*
You'll have a different directory name in the latter case.
Lock the settings LSO read-only:
$ chmod 400
~/.macromedia/Flash_Player/macromedia.com/support/flashplayer/sys/settings.sol
Lock down the entire directory structure to , so that no-one can add any
more:
$ find ~/.macromedia -type d | xargs chmod 500
Aaaaah:
$ find ~/.macromedia | xargs ls -ld
Now, if you watch something on YouTube, the browser is unable to write
to the directory.
If you want a particular site to store LSOs:
1. Temporarily enable write permission on the UED5REU8/ and sys/
directories
2. Visit the site
3. Remove write permission from the UED5REU8/ and sys/ directories,
but leave write permission on the new site-specific subdirectories.
Douglas.
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