Ubuntu – How to set umask for a specific folder

permissionsumask

For some obvious reasons I need to set umask value for one specific folder. How can one do that?

Thanks beforehand!

UPDATE 1

The reason I need to use umask for a specific folder is following. I have a web application and when it creates some file the default permission is 700. But I need at least 755 permission for that file. I think I could explain the problem more clearly now.

Best Answer

you could use setfacl

setfacl -d -m group:name:rwx /path/to/your/dir

Where name is the group name

To find which groups you or a specific user belong see In unix/linux how do you find out what group a given user is in via command line?

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Ubuntu – Create new ssh user account to access specific folder only

You should be able to accomplish this with

adduser --home /var/www/specific_folder --shell /bin/bash --no-create-home --ingroup www-data --ingroup ssh tonya

adduser is used to add a user
--home specifies home directory which is where the user will be when they log in
--shell is to specify the shell, by default it is usually just /bin/sh which is not as user friendly as /bin/bash
--no-create-home will not create the home directory so you must use one that already exists
--ingroup adds the user to specified group
the last argument is the username

You could make the user jailed using this guide:

Restrict SSH User Access to Certain Directory Using Chrooted Jail

Please remember that even if you jail a user, it is very possible to escape a jail. If you're giving a user access to your system, you may as well be giving them root access because once they have shell access, it's almost always possible to gain root. Setting up a jail will most likely keep a basic user from doing anything too harmful but will do little to nothing to stop a malicious user from doing harmful stuff.

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Ubuntu – Create new ssh user account to access specific folder only

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