How to give access only to a certain folder and nowhere else?

Question

linux

Good day.
I don’t have much experience with servers, but now it became necessary to provide FTP access to a certain folder for editing and nowhere else.
Folder where to give access to /var/www/site_dev/assets.
I made a new user, in the sshd_config folder I registered
Match group newusernamegroup
ChrootDirectory /home/%u/
X11Forwarding no
AllowTcpForwarding no
ForceCommand internal-sftp
Register in ChrootDirectory /var/www/site_dev/assets. I can't, because many groups of users need write permissions to /var/www/.
There is an option to take files from /home/%u/ with cron every second and shuffle them into the end folder, but this is somehow not correct.
ubuntu server.
Thanks

Answer 1

Register in ChrootDirectory /var/www/site_dev/assets. I can't, because many groups of users need write permissions to /var/www/.

I do not quite understand how the rights of other users are connected with Chroot'om, in your case ... Well, that's not the point.

There is an option to take files from /home/%u/ with cron every second and shuffle them into the end folder, but this is somehow not correct.

Cron initially runs 1 time per minute (minimum) and is not well suited to doing something every second. In this case, it would be easier to write a script with an infinite loop and not croon at least 60 jobs (so that they run in a second). And if it’s more correct, use some kind of synchronization system for this, for example, Rsync .
You can also try mount --bind , I don't know if it will help in your case, but it's worth a try.

Answer 2

Good day.
Most likely this solution will help you .