Since the session cache clears keys after a period of time, this fixes#1821.
Based on https://github.com/mail-in-a-box/mailinabox/pull/2012, and so:
Co-Authored-By: NewbieOrange <NewbieOrange@users.noreply.github.com>
Also fixes#2029 by not revealing through the login failure error message whether a user exists or not.
Port 465 with "implicit" (i.e. always-on) TLS is a more secure approach than port 587 with explicit (i.e. optional and only on with STARTTLS). Although we reject credentials on port 587 without STARTTLS, by that point credentials have already been sent.
[this is a squashed merge from-]
* Install owncoud 9.1 and provide an upgrade path from 8.2. This also disables memcached and goes with apc. The upgrade fails with memcached.
* Remove php apc setting
* Add dav migrations for each user
* Add some comments to the code
* When upgrading owncloud from 8.2.3 to 9.1.0 the backup of 8.2.3 was overwritten when going from 9.0 to 9.1
* Add upgrade path from 8.1.1. Only do an upgrade check if owncloud was previously installed.
* Stop php5-fpm before owncloud upgrade to prevent database locks
* Fix fail2ban tests for owncloud 9
* When upgrading owncloud copy the database to the user-data/owncloud-backup directory
* Remove not need unzip directives during owncloud extraction. Directory is removed beforehand so a normal extraction is fine
* Improve backup of owncloud installation and provide a post installation restore script. Update the owncloud version number to 9.1.1. Update the calendar and contacts apps to the latest versions
* Separate the ownCloud upgrades visually in the console output.
Don't check NS records for now because they will only appear on zones.
If a hostname is a subdomain on a zone and not itself a zone, it will
lack NS records.
Also stop testing for ADSP, which we dropped in 126ea94ccf.
