I want to authenticate into my system many users, but I don't try useradd 300 times and add 300 lines into /etc/passwd.
Can I to use one account (for example /home/unique-user) and different ssh public keys to set many accounts and different permissions for subdirectory in unique-user for each user (for example /home/subdirectory/{dir1, dir2, dir3...})?
That is to say, how can to assign dir to ssh public key 1, dir to public ssh key 2, ...

savio

I don't think it's possible.
You can specify individual identity files when logging in, but all the subdirectories will be owned by and effectively accessed by, unique-user. This means any authenticated user will have complete access to everybody else's directories.

To create a account into any system I necessary must have /etc/passwd?
Can I create a account into system without using /etc/passwd file but with Kerberos, Radius or LDAP?

Why do you want to avoid using the normal account handling process?

I'd like to use MySQL instead /etc/passwd for managing accounts

Okay but what would MySQL give you that you don't have with the normal approach?

You can use MySQL as a layer on top of the /etc/passwd if it is a more convenient access mechanism to the account information that you want but maybe you want more which I don't know about. So back to my original question why?

Hi -

Yes, of course. It takes a bit more work and requires a LOT more sophistication than the simple "/etc/hosts" method. But it's clearly superior for an "enterprise environment" where a user's "identity" and user "roles" span many hosts.

Bad idea - don't go there.

If you've got a web app (for example, a self-serve kiosk) that already has a MySQL back-end, and you want to manage users specific to that web app - then sure: MySQL is ideal. Go for it!

But it you just want to save yourself typing 300 names ... and then you still want those 300 users to be able to log in to an actual host, give them "home directories", let them run programs, read and write files, etc etc - then trying to jury rig some homebrew login scheme with MySql (or just about anything else) ... is a really, really REALLY bad idea.

IMHO .. PSM

Moved to Linux-General (Not a prograqmming question)