Pluggable authentication modules (PAM)

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8
votes
9answers
24k views

Desktop login fails, terminal works

I have a freshly setup 12.04 LTS pc system (120 GB SSD, 1 TB HDD, 16 GiB RAM); since a few days, I can't login to the graphical desktop anymore: there is very short flashing shell window which ...
8
votes
1answer
634 views

Use one password for administration and another for system login

How can I give a user one password for normal usage when logging in, and another password for system administration and sudo access? I want one user to have two passwords.
2
votes
2answers
3k views

Pam_mount won't automount encrypted partiton

As usual, when I install a new version of Ubuntu I install pam_mount to automount my with LUKS encrypted partition on login. However, for Ubuntu 11.10, I followed the same procedure as usual, but I ...
14
votes
2answers
22k views

How do you set requirements (such as minimum length) on passwords?

Is there any way to set up minimum passcode requirements, such as a minimum length, requirement of mixed case alphanumerics and at least 1 symbol in the passcode, and enforce that at passcode changes?
3
votes
4answers
10k views

Type password into login screen, hit enter - nothing happens

I first install Ubuntu 13.10 a few weeks ago and its been going great. I'm still pretty new to Linux, so I haven't been doing a whole lot. The past couple days I've tried installing LAMP, then ...
0
votes
0answers
138 views

How to Fuse Mount into Home Folders - After EcryptFS is mounted?

Question: In Linux, how do you automate a folder to be mounted into a User's Home Folder? -- But with these constraints: Only After their Encrypted Home Folder has been mounted -- so the mount ...
5
votes
1answer
5k views

how to setup two factor authentication in Ubuntu for Ubuntu users using Google authenticator?

How to setup two factor authentication in Ubuntu for Ubuntu users using Google authenticator (It can also be setup for non Google accounts)?
5
votes
1answer
6k views

How do I enforce a password complexity policy?

I need to configure an Ubuntu server to follow a strict company password policy that specifies the following: at least one upper case at least one lower case at least one digit at least one special ...
4
votes
3answers
15k views

Where are passwords stored?

How do you figure out where are user's passwords stored, for users that can login? I know the system is using LDAP for users (username, home path, etc.), but it doesn't contain any kind of passwords. ...
4
votes
1answer
3k views

I cannot login into any TTYs

My system is Ubuntu 11.10 (installed from 0, without upgrades/updates). When I enter into any tty (1, 2, 3..) it ask me my login name and password but I can not move forward. When I enter an user ...
1
vote
0answers
88 views

winbind and passwd issues

I successfully configured a Ubuntu 15.10 Workstation to authenticate against Active Directory. The only thing left so far is the ability to change the Active Directory password. When I enter the ...
0
votes
0answers
200 views

Installing and configuring LDAP & NSCD break 16.04 Xenial

I have done many installs and always end up breaking the system. The steps I take are: Fresh, clean install (have done both LVM and non-LVM, UEFI and EFI) on HDD with no other OSes in place Reboot ...
0
votes
2answers
90 views

pam / ad issues with server-based application

Following the 16.04 upgrade we had some pam / ad issues which were solved based on community answers (ie lockscreen, authentication). We now have a new and critical one. We run a lot of RStudio ...
6
votes
1answer
4k views

Permanently raising nofile limits in Ubuntu 14.04 LTS

I cannot seem to figure out what exactly is needed to allow the maximum number of file descriptors to be raised permanently for all users. /etc/security/limits.conf: root hard nofile ...
0
votes
1answer
29 views

pam / ad issue with cron

Jobs in /etc/crontab which belong to non-local users now fail. That is a bit of a problem for us: May 26 13:05:01 machineXYZ CRON[26927]: pam_sss(cron:account): \ Access denied for ...
0
votes
1answer
130 views

Identification and Authentication methods in Ubuntu

Since I have a very long password, I would like to additionally use an alternative login method. Which other authentication methods are possible in Ubuntu to log in?
0
votes
1answer
434 views

Slow login when CIFS mounts are unavailable

I installed a PC with Ubuntu 14.04, Sssd and accounts in our OpenLDAP directory. Network shares residing on our Samba server are mounted automatically when a user logs in, through pam_mount ...