Pluggable authentication modules, a flexible framework for configuring authentication, most commonly the login component of Linux systems, but used in other components and operating systems.

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changing shadow hash algorithm to bcrypt: how to rehash

I want to change my SHA512 shadow file to use bcrypt as shown in this question/answer: Enable blowfish-based hash support for crypt The problem is that i run into a chicken and egg problem, because ...
3
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1answer
3k views

Private key authentication with pam_ldap

I'd like to set up pam_ldap on some of our servers so that we can centrally manage who has access to which server, and easily revoke access if e.g. someone leaves the company. I've done some research ...
3
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1answer
372 views

LDAP authentication fails

I try to set up an LDAP directory that will allow me to authenticate Debian users. Once the configuration of the LDAP server and PAM files is done, the authentication fails. I think the client doesn't ...
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1answer
379 views

PAM Faulty Module

After updating PAM secure log started showing: su: PAM unable to dlopen(/lib64/security/pam_rootok.so): /lib64/security/pam_rootok.so: undefined symbol: selinux_check_access su: PAM adding faulty ...
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1answer
2k views

Understanding PAM authentication procedure on FreeBSD with security/sssd

I'm trying to understand what's behaving errantly on my PAM configuration on FreeBSD 10.0 The machine is configured with two different authentication realms, one is the default Unix authentication ...
3
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1answer
4k views

Account Lockout with pam_faillock in RHEL6

Previously, I asked about using pam_tally2 under RHEL6. I would like to pose this question and answer to document the recommended use of pam_faillock over pam_tally2 for the same function; What is ...
3
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1answer
502 views

build user chroot on first login

I'm using ldap for remote user authentication and I basically need to either figure out how to: a. chroot a user on machine b from machine a via nfs,(which doesn't seem possible without mounting ...
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1answer
3k views

How to restore pam configuration?

I did some modifications in /etc/pam.d/common-auth, /etc/pam.d/common-account, /etc/pam.d/common-password, /etc/pam.d/common-session files. Is there any way to restore default pam configuration? I am ...
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3answers
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LDAP and pam without binddn and anonymous access

I am working in a large company and can use its central read-only LDAP server remotely. The LDAP server does not allow anonymous binding. In order to use this server for authentication of the users on ...
3
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1answer
4k views

vsftp login errors 530 login incorrect

Using Ubuntu 10.04 on an aws ec2 instance. I was happy just using ssh but then a wordpress plugin needs ftp access...I just need ftp access for one site www.sitebuilt.net which is in /home/sitebuil. ...
3
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1answer
868 views

Where do I find USEFUL official documentation for LDAP authentication on Centos/RHEL 6?

Does it exist any official installation documentation about how to setup an LDAP server that I can connect my clients to with authconfig. I'm will be Centos 6 and RHEL 6.1. What I can find is this. ...
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2answers
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VsFTPd - LDAP - PAM

I am trying to configure a VsFTPd server to authenticate agains an LDAP server. It may be easy, but since it is the first time that I am using both LDAP and PAM, I have some difficulties. VsFTPd runs ...
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1answer
2k views

How is the cgroup pam module configured?

Linux has a PAM module that manipulates cgroups. How is it configured (what options does it support?)
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2answers
2k views

sshd: How to enable PAM authentication for specific users under

I am using sshd, and allow logins with public key authentication. I want to allow select users to log in with a PAM two-factor authentication module. Is there any way I can allow PAM two-factor ...
3
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1answer
63 views

Kerberos authentication fails when local password is expired

I am using pam_krb5 with local accounts (Linux) for AD password authentication. Things are working great, users are able to authenticate with both AD and local passwords. I am having a problem ...
3
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1answer
117 views

ssh as user runs program with no authentication (neither password nor keys)

I'd like to set up a user on my system (Ubuntu 14.04 x64) such that people can run ssh example@myhost.example.com and see some output from a program without being prompted for a password or having to ...
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2answers
3k views

Join Red Hat Linux 6 to a Windows Active Directory Domain

I am using Red Hat 6 (for testing purpose) and configure samba with active directory.Red Hat 6 has successfully join with my windows server 2003 domain. By typing the command [root@mainserver /] # ...
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1answer
1k views

How to make exception in password locking via pam_tally2 for specific user?

I need to make an exception for a specific user, so that his failed logins are not counted by pam_tally2, and well, this is not a root account (I'd use magic_root then). Is it doable?
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1answer
67 views

sudo failing even though ownership and modes set correctly

I am getting the dreaded sudo: must be setuid root error even though the executable in /usr/bin/sudo has ownership root:root and mode 4755 (-rwsr-xr-x). /etc/sudoers is mode 440. My user is in sudoers ...
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1answer
245 views

Can I use both the RSA 2-Factor PAM and an Active Directory PAM at the same time?

Let's use the product formerly known as Likewise as an example. I can very easily install this on a Linux machine and join it to an Active Directory domain. I can also use an RSA PAM module so that ...
3
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1answer
701 views

Should pam_mkhomedir go in /etc/pam.d/login , sshd or system-auth?

I want to enable pam_mkhomedir.so for users who authenticate to our system. I want a user's home directory to be created when they SSH into the box. One common convention seems to be to put ...
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1answer
1k views

Logging on as root without winbind timeouts

How can I set up my Linux box so that, if the Active Directory domain controller is down, I can still log in as root, without any timeouts or delays? Following the example of most of the ...
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1answer
3k views

OpenLDAP client configuration headache in FreeBSD

I am using FreeBSD 7.2 as an NFS server, and as a client to an OpenLDAP server (which runs Debian etch). When users access their files on the NFS server, the users' UIDs are looked up in the ldap ...
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2answers
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Ubuntu 12.04 updates broke VSFTP

I am running Ubuntu 12.04 LTS. I did some minor updates using apt. After rebooting vsftp stopped accepting connections system user logins. In the auth log I am getting the following errors Dec 22 ...
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1answer
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Linux with winbind, disable local users while AD is available?

Routers and switches with RADIUS authentication can be configured such that login is disabled for locally configured users as long as the RADIUS server is available. If the RADIUS server becomes ...
3
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1answer
372 views

Samba, password change and windows error messages

I moved password quality checking in Samba from check password script to PAM, now when pam_passwdqc or pam_cracklib deny password change the user revives a "Access denied" error, not the standard "The ...
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2answers
2k views

Using ecryptfs encrypted home directories with Dovecot

I have setup home directory encryption on Ubuntu 10.04 machine, but ecryptfs does not seem to be able to work with Dovecot (or CourierIMAP, etc). After successful IMAP login, home directory is never ...
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2answers
8k views

PAM / LDAP authentication with Ubuntu 10.04

I can't wrap my brain around the new pam.d configuration syntax used in Ubuntu 10.04. How do I setup PAM so that it allows users stored in my LDAP database to login. I already configured nscd, so id ...
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2answers
2k views

PPTPD with PAM authentication?

I need a VPN solution for my company. One requirement is to be able to use the built-in windows VPN client. We are running a Debian Etch server. I've managed to set up PPTPD but the authentication is ...
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0answers
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Ubuntu server + Samba + PAM + Apple OpenDirectory

Due to various reasons, we are looking to migrate our file servers from OS X Server 10.9 over to a true Samba implementation running on Ubuntu 14.04LTS. We have Ubuntu up and running with Samba ...
3
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1answer
857 views

Kerberos-PAM authentication failure: pam or pre-authentication

kinit -p 'username' works -- no problem with the setup of the Kerberos realm. I can't get the login from the GUI to work, however. Client auth.log: pam_krb5(gdm3:auth): user <username> ...
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1answer
389 views

Virtual users in sshd from a postgres database

I have a Postgresql database full of user accounts, and i would like to allow these user to access a server through ssh, using only public keys authentification. So far, i have setup these parts on ...
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4answers
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pam_ldap.so before pam_unix.so? Is it ever possible?

we have a couple of servers with PAM+LDAP. The configuration is standard (see http://arthurdejong.org/nss-pam-ldapd/setup or http://wiki.debian.org/LDAP/PAM). For example, /etc/pam.d/common-auth ...
3
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1answer
1k views

vsftpd with pam_winbind.so

I'm trying to setup vsftpd to use logins from our domain. I want the ftp users to be able to login using their active directory username/password and have be able to have full access to ...
2
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2answers
2k views

How to automatically create user accounts ( SSH + LDAP )

I set up remote LDAP server (Server1) and SSH with pam_ldap on Server2. Everything is working ok, I can login to SSH with LDAP credentials. But when I want to add new user, I have to firstly create it ...
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3answers
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Programmatic way to validate a Linux Login/password

I would to like to validate a username and password correspond to a valid unix account. The current solution I have uses expect to wait for a password prompt and then supply the password and see if ...
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2answers
2k views

FreeBSD LDAP authentication, pam_ldap, can't bind

I've been able to get some of my linux servers authenticating users against my LDAP directory server, but I've been having some trouble trying to do this with nss_ldap and pam_ldap in FreeBSD. Going ...
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1answer
10k views

PAM unable to dlopen(/lib64/security/pam_fprintd.so) causing CentOS/Redhat server to crash

CentOS 6, Parallels PLESK 10.4, Apache One of my servers went down over the weekend much to my dismay. On the day and time it occurred, my log errors/messages end with this - /var/log/secure: Jul ...
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4answers
5k views

How to access Unix passwd file from Apache when using .htaccess?

Is it possible to use the system passwd file for accessing a protected web page with Apache on Linux? Setting up multiple password files for shell access, Apache and Samba is a pain. If there is a ...
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2answers
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Authenticate CVS users against Active Directory

I have a mixed Linux/Windows software development environment where the Linux clients are migrating to a system where they are able to authenticate against Active Directory. (That part I figured out) ...
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4answers
7k views

PAM module causes flurry of SSH sessions

While tailing /var/log/auth.log I noticed that there where multiple entries being entered (instantly) by the minute for user "foo". I personally had only one connection open as user "root_bar" while ...
2
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1answer
799 views

map remote ssh user to a different local user

All my boxes have the same username for myself, except one legacy machine where I'm loath to try to change it. Whenever I ssh to the machine, I forget to specify my user name, and my password is ...
2
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1answer
41 views

Security implications when only allowing logins via key and UsePAM setting is 'yes'?

When setting up a new server, I generally want to allow logins only via key authentification and not from the root user. Therefore, I edit the sshd_config like this: I change 'PermitRootLogin' to ...
2
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1answer
712 views

Why is sshd engaging PAM still?

Background/Behavior is: if you ssh to box via and GSSAPI/Kerberos succeeds and you have a local user in /etc/passwd, you login fine per below PAM config. All Good there. But if you don't have a ...
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2answers
971 views

Debugging a Postfix Saslauthd PAM-PGsql authentication failure

I've set up pam-pgsql to lookup passwords in my database for Postfix via Saslauthd. I can test credentials using the command line: $ sudo testsaslauthd -u user@email.com -p password 0: NO ...
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1answer
1k views

edit crontab for apache

I am transfering crontabs from an old server (centos 5.5) to a a new (centos 6.0) and there is a problem with (the most important) user apache. On the new server I am getting the following: ...
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1answer
279 views

Customize PAM messages

I would like to customize my password expiration warnings. I figured PAM reads them from somewhere, but can't find from where. The question is relevant for both Ubuntu/Debian and Fedora/RHEL/CentOS. ...
2
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1answer
1k views

Google Authenticator PAM for specific users

My current sshd PAM config: #%PAM-1.0 auth include system-auth account required pam_nologin.so account include system-auth password include system-auth session ...
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1answer
2k views

PAM, nsswitch and LDAP configuration

I have a technical and precise question about two type of configuration about LDAP, pam configuration files and nsswitch.conf. Wich is the difference between the passwd_compat configuration and the ...
2
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1answer
582 views

Passwd via PAM only work for LDAP

Now I'v got a working setup using PAM+LDAP over SSL but I can only passwd users in the ldap tree, any idea about how to be able to passwd every users ? Here are some conf files : ...