On Thu, Jul 18, 2019, at 19:09, Egoitz Aurrekoetxea wrote:
> Good morning,
>
> When using delete_delayed if someone removes a big folder (that one with more
> than 20 subfolders anywhere below it) in mboxlist_delayed_deletemailbox()
> only last 20 are preserved. We think it could be a good idea to preserve all
> and to have a parameter for configuring it. The reason for that, is that we
> use delete_delayed for storing the removed content remotely with the customer
> hired retention period in slow disk space. Perhaps could be a good idea
> something like :
>
> In mboxlist_delayed_deletemailbox() :
>
> *If (!preserve_delete_delayed_folders_always)*
> *{*
> /* keep the last 19, so the new one is the 20th */
> for (i = 0; i < (int)existing.count - 19; i++) {
> const char *subname = strarray_nth(&existing, i);
> syslog(LOG_NOTICE, "too many subfolders for %s, deleting %s (%d / %d)",
> newname, subname, i+1, (int)existing.count);
> r = mboxlist_deletemailbox(subname, 1, userid, auth_state, NULL, 0, 1, 1,
> keep_intermediaries);
> if (r) goto done;
> }
> *}*
Hmm.... yeah, OK. This is actually buggy in that case! The intended behaviour
was to avoid a Denial of Service attack where you would create and delete the
same mailbox name millions of times - however, the whole concept is bogus
because there's nothing stopping somebody creating and deleting folder000001
through folderFFFFFF and creating the same attack.
I suggest that we just remove this whole silly check entirely, and if we want a
similar level of attack protection we do something smarter like a quota for
total folders+deleted folders that haven't been cleaned up yet - set it high
enough that anybody hitting that is clearly doing something wrong, and require
the administrator semi-manually clean up the deleted folders in order to
re-allow folder creation.
Cheers,
Bron.
--
br...@fastmailteam.com
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