Log from IRC discussion:

[09:02:52] <nuclear_eclipse> texens: I assume you are the one who mailed
mantisbt-help regarding attachments?
[09:03:12] <texens> yes :)
[09:03:31] <texens> I thought I should mail it rather than expalin at length on
the IRC
[09:03:34] <nuclear_eclipse> the short reply is that we do absolutely nothing
[09:03:48] <texens> oops..
[09:04:13] <nuclear_eclipse> by default, we store files in the database, but can
optionally store them on the filesystem as well
[09:04:14] <texens> despite the fact that it allows one to upload even zip and
.php, .js files
[09:04:19] <texens> hmm..
[09:04:43] <nuclear_eclipse> in the case of putting them in the database, the
only option would be to run a scan against the in-memory file before database
insertion
[09:05:45] <nuclear_eclipse> if storing on the filesystem, you could technically
use a separate process to continually watch for new files in the attachments
directory, and immediately scan them as they are added
[09:06:36] <nuclear_eclipse> however, I'm honestly not sure of the
security/malware implications or effectiveness of either approach
[09:06:49] <texens> does Mantis have any hooks to call this *separate process*
every time a new file is uploaded?
[09:07:03] <nuclear_eclipse> not currently
[09:08:11] <nuclear_eclipse> there have been requests to add plugin hooks around
the attachment process, but I haven't yet found a reasonable way to support
anything other than very specific usecases with those events, so I haven't
implemented anything yet
[09:08:12] <texens> hmm.. I guess it would be a good idea to implement it. what
do you say?
[09:11:41] <nuclear_eclipse> texens: we're always happy to accept and review
code submissions :)
[09:12:01] <texens> sure, I'd love to volunteer on this one
[09:12:29] <nuclear_eclipse> texens: are you familiar with using Git?
[09:13:10] <texens> I'm well versed with svn, and it shouldn't be hard to learn 
git.
[09:13:24] <nuclear_eclipse> ok
[09:14:03] <nuclear_eclipse> if you want, you can set up a public repo on
git.mantisforge.org that you can push to for sharing your code with other 
developers
[09:14:54] <nuclear_eclipse> if you need some documentation on using git,
there's a small list of references in the online documentation at
http://docs.mantisbt.org/master/en/developers/dev.appendix.html#DEV.APPENDIX.GIT
[09:16:49] <texens> thanks :)
[09:17:02] <nuclear_eclipse> regarding Mantis, you'll probably want to get
familiar with how the event and plugin systems work; there's some documentation
at http://docs.mantisbt.org/master/en/developers/ but the code is the best
reference, found in mantisbt/core/event_api.php and mantisbt/core/plugin_api.php
[09:19:08] <texens> does mantis currently save the uploaded files in some sort
of vault?
[09:19:36] <texens> vault = directory with strict permissions?
[09:19:59] <nuclear_eclipse> that's configurable; by default they all get stored
into a single table in the database, otherwise it's up to the Mantis admin to
set up a directory and tell Mantis where to put everything
[09:20:56] <nuclear_eclipse> naturally site admins should be creating a place
for attachments outside of the webroot for security reasons, but Mantis won't
complain about whatever their choice is
[09:22:01] <texens> nuclear_eclipse: it might not be possible for someone with
shared hosting, to keep it outside of the webroot
[09:22:43] <nuclear_eclipse> correct, at which point they should be configuring
some sort of .htaccess rules to prevent the files from being accessible through
the webserver

-- 
John Reese
LeetCode.net

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