FTP server with virtual users and certain directories and rights on ubuntu server 14.04, how to do?

Question

FTP

After installing Ubuntu server + php5 + apache2 + mysql + openssh
It is required to constantly upload files to different directories located in /var/www/
The FTP server has not yet raised any, but through FilleZila I can go through s ftp://XX.XX.XX .XX using my username and password, but I can't change anything.

Ошибка:	/var/www/mysite.loc/public_html/themes/head.php: open for write: permission denied
Ошибка:	Передача файла потерпела неудачу

And how do I close sftp, as I understand it, it works through openssh
Actually the task:
A list of users who would not be in the system, but stored in some file or in a database (mysql)
So that each user can be given their own directory with full rights , sometimes 3 users one directory.
Restrict access outside the directory.
And the ability to grant read-only access.
How to do this? More details if possible.

As an option, I liked the vsftpd solution with virtual users vovanys.com/linux/nastrojka-vsftpd-s-xraneniem-uch
...
rus-linux.net/MyLDP/internet/vsftpd.html
a separate category, but I myself need to assign which directories to whom to give and rights
. Can this be done using the method described in the two links above?

Answer 1

https://pyd.io/
https://owncloud.org/

Answer 2

OwnCloud has everything you need and even more.

Answer 3

I have not done this for a long time, but useful links remained:
interface31.ru/tech_it/2012/02/prostoy-ftp-server-...
http://help.ubuntu.ru/wiki/guide_ubuntu_s...

Answer 4

But there is one thing, but there each virtual user creates its own separate category, but I myself need to assign which directories to whom to give and rights
----------------------
Well, in linux, you can distribute the rights to the folder and files. Groups and Users. chmod , chown.
Another option from ftp servers is to look at proftpd.
You can make access via sftp, though the file transfer speed will most likely be low.