apache 2.2 - folder permissions for linux webhost (ubuntu)

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I have a VPS running ubuntu 12.04 that
is hosting about 9 sites which are a mix of wordpress and joomla (latest
versions).

Apache runs under www-data and sites
are hosted as virtualhost under
/var/www/{sites}

Today I disabled FTP
(insecure) and replaced it with SFTP. I've set this up so that every site/virtualhost
has a SFTP user that is chrooted. when you login as SFTP user you get chrooted into
/usr/local/chroot/{user}, in this directory i've mounted the specific virtualhost this
user needs access to (with mount --bind /var/www/{subdomain}
/usr/local/chroot/{user}/web)

the SFTP users are
setup so that they can only SFTP and not SSH and their shell is set to
/sbin/false

the only problem/question I have is
with the user permissions. the sites run as www-data so when I upload something in for
example joomla the file is created with www-data:www-data ownership. however if i upload
a file using SFTP it's uploaded as {user}:www-data. this can lead to problems with
permissions.

what would be the best way to
handle file-ownership and permissions in this case? Also is the way I set this up
safe?

Answer

Simple way, if you're sure of your security
settings: set the suid bit on the main folder. But I don't see what permission troubles
you'd have anyway, since the group is already set on www-data.

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