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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5
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1answer
414 views

Combination of SSH key auth, and two-factor authentication

I was wondering if it is possible to accomplish the following, all at the same time: Disable root logins Enable SSH login for personal user, only via SSH keys Enable SSH login for unprivileged user, ...
2
votes
0answers
490 views

How to mount share in pam_mount.conf.xml depending of OU

I have a Microsoft Windows domain and I want to add the ubuntu machines with Likewise-Open. There is no problem with that, but in my windows machines I have a GPO that mount a net share depending of ...
1
vote
1answer
280 views

PAM won't authenticate with mysql (make_scrambled_password deprecated)

I have spent some time searching for this and it seems I'm the only one having problem with PAM not authenticating through mysql due to current updates so I thought I will post my problem here and if ...
7
votes
1answer
657 views

Prevent fork bomb inside docker container

I am currently struggling with limiting number of processes for user which I called sandbox. I configured processes limit inside /etc/security/limits.conf like this: sandbox hard nproc ...
1
vote
2answers
4k views

Configuring vsftpd to authenticate with Active Directory

We are trying to give vsftpd access to some Active Directory users. Here are some configuration file contents: # egrep -v '^(#.*|)$' vsftpd.conf anonymous_enable=YES local_enable=YES ...
3
votes
1answer
248 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 ...
1
vote
1answer
745 views

pam_cracklib reports bad password correctly but pam_unix module STILL changes the password

I am currently trying to use pam_cracklib which properly fails according to my debug.log but even though it is setup as a password requisite entry in my PAM config file, it still falls through to the ...
1
vote
3answers
5k views

ulimit -n not changing - values limits.conf has no effect

I am trying to raise the open file descriptor maximum for all users on an ubuntu machine. This question is somewhat of a follow up to this question. open file descriptor limits.conf setting ...
0
votes
1answer
698 views

Authenticate Radius user using pam and ssh [duplicate]

I am able to authenticate radius users using radius server+pam+ssh with creating local user with blank password in linux. Is it possible to authenticate radius users without creating users in local ...
0
votes
1answer
330 views

PAM exec stdout issue

I am having an issue with a dead simple python script; called with pam_exec. I added a line at the end of that file /etc/pam.d/common-session : session optional pam_exec.so /bin/python ...
1
vote
0answers
235 views

OpenLDAP on ArchLinux users cannot change passwd

I started an office and i NEED centralized login and home directories to work. Since all workstations are going to run Arch and problems with different LDAP versions I finally concluded the LDAP ...
0
votes
1answer
886 views

Can't login with KDM and SSSD but works fine from console

I have LDAP authentication set up with SSSD and I can login fine through console and ssh. However when I try to login through KDM it just says authentication failure... More specifically: Jan 9 ...
0
votes
1answer
343 views

OpenLDAP client configuration. Can search but cannot login?

I'm trying to set up LDAP on a Gentoo workstation to authenticate against a central server. However, I encountered some issues and I really hope you guys can help me out here :) First off, the LDAP ...
2
votes
0answers
334 views

Authentization agains Samba4 domain controler and not working kinit

I've a problem with Samba 4 and Kerberos. If I call kinit, it writes Client not found in Kerberos database while getting initial credentials. I find out, that the Kerberos works with user name only, ...
1
vote
1answer
41 views

SSH listen on 2 ports, With a single config

Im trying to make SSH logins require 2 factor auth but only on one port. So port 1 is open only to a list of ip's managed by iptables. and only requires password / key port 2 is open to all, But ...
3
votes
3answers
1k views

How can I delay sshd login after bad password

How can I delay the retry response from SSH when a bad password is tried or unsuccessful login attempt. I wanted the delay to be 2-3 second more that usual. I could not find any option in ...
4
votes
1answer
1k views

How to use PAM to check LDAP password for some users, yet always use UID/GIDs from local files?

For a subset of my users in /etc/passwd, I would like to configure PAM (on Linux) to do the password checking part of the logon against an LDAP server, ignoring that these users are actually are ...
1
vote
4answers
14k views

kinit & pam_sss: Cannot find KDC for requested realm while getting initial credentials

I have a very similar problem as described in this thread on CentOS 6.3 authenticating against a 2008R2 AD DC. Here is my krb5.conf, I know for a fact that XXXXXXX.LOCAL is the true domain name: ...
1
vote
2answers
335 views

How does Cron interact with Kerberos for authentication?

I have a CentOS 6.4 machine which is set up with pam_ldap and pam_krb5. It is configured to use our Active Directory servers for authentication. I can SSH into the machine using AD accounts. I have ...
2
votes
3answers
536 views

How to handle centralized user authentication without LDAP?

I'm attempting to create a centralized database for my users for my server and web accesses, so that I can allow those users to log in through ssh if they have access, and through my web services to ...
1
vote
1answer
220 views

PAM Module works fine on i386 but fails on x64 when used in vsftpd

We have a custom PAM module that works fine on our i386 development machines but when we try and use it in production on our x64 production servers with vsftpd it fails. The PAM module has been ...
0
votes
1answer
254 views

AD Login to Solaris Zone Periodically Not Working

I have a Solaris 11.1 zone named "AZone". I have the zone joined to an Active Directory domain (Windows Server 2008) with the goal of users being able to use their AD account to log in to the Solaris ...
2
votes
1answer
399 views

PAM Winbind Expired Password

We've got Winbind/Kerberos setup on RHEL for AD authentication. Working fine however I noticed that when a password has expired, we get a warning but shell access is still granted. What's the ...
1
vote
1answer
122 views

PAM problems with “success=N” action

I want to run a script when an authentication failure occurs. But, with the following conf file, authenitcation always fails even when the proper credentials are supplied. auth [success=1 ...
1
vote
1answer
1k views

How to restore pam confiugration?

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?. ...
1
vote
1answer
103 views

SSH/ Telnet PAM configuration

How do I configure maximum number of login attempts before the session is dropped for SSH/telnet in PAM?
0
votes
1answer
219 views

Users Password does not reset after successful login at the console but works fine with SSH

The title says it all. I have my unsuccessful login attempts set to three. I purposefully fail logging in 2x, then when I SSH into the box successfully the 3rd time my count drops back to zero; ...
6
votes
1answer
10k views

ssh: “Access denied by PAM account configuration” for one non-root user but not another

On a VM I am initializing I am able to log in as one non-root user (admin) but not another (tbbscraper) over SSH with public key authentication. The only error message I can find in any log file is ...
6
votes
2answers
2k views

Understand PAM and NSS

In the last days I have set up some Linux system with LDAP authentication and everything works fine, but there's still something I can't really understand regarding NSS and PAM, also after a lot of ...
1
vote
1answer
115 views

Limiting login via access.conf not working

I'm running Debian Wheezy and having a rough time getting /etc/security/access.conf changes to apply. Tangentially, I believe there could be an issue with PAM in general as I have been unable to get ...
0
votes
1answer
259 views

system authentication and radius authentication

I am using CentOS 6.3 and want to enable ssh RADIUS authentication along with Centos system Authentication. Right now my server is firstly authenticated with RADIUS server. And after system ...
0
votes
1answer
458 views

PAM: auth: pam_unix(dovecot:auth): authentication failure;

We have opnldap setup on our ubuntu server, and were getting this message for a user: auth: pam_unix(dovecot:account): account has expired (account expired) Sep 3 19:05:03 auth: ...
3
votes
1answer
704 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?
2
votes
1answer
167 views

Disable hostname resolution in PAM

When authenticating using PAM, PAM exposes the remote host to the module. On the code side of things, it exposes this via PAM_RHOST using pam_get_item(). However, PAM will attempt to resolve the IP ...
0
votes
1answer
476 views

Strange Change in ssh behavior + LDAP

We have a cluster with a front node that admits normal users and LDAP users. Two days ago the ssh show a strange behavior: The LDAP users can't login in the front node using password but, The LDAP ...
3
votes
3answers
4k views

sssd vs nslcd for RHEL-5/6

We have 50 RH-5 machines and 70 RH-6 machines. I am looking to decide what we should use for LDAP: nscd/nslcd for all RH-5/RH-6 servers nscd/nslcd for RH-5 servers, sssd for RH-6 servers sssd for ...
3
votes
1answer
4k views

What is nsswitch compat mode?

Red Hat recommended me compat mode in /etc/nsswitch.conf as one of the options to enumerate LDAP users, but later said that it's not a much-used method. nsswitch.conf passwd: files compat ...
0
votes
1answer
212 views

What are disadvantages of using nsswitch compat?

In my current LDAP set-up "getent passwd" shows all 600+ users that exist in the LDAP, not enumerating only the 20 LDAP-users that have permission to access this netgroup/server. This can be solved ...
6
votes
1answer
505 views

Need help understanding PAM directives

I have the following directives in my /etc/pam.d/sshd file on a RHEL5 box and I'm a bit confused. These directives are there to make LDAP+RADIUS+OTP work. What I'm trying to do is tell pam not to ...
2
votes
1answer
406 views

How can I limit failed sasl2/pam_mysql login retries?

I have Postfix setup serving multiple virtual domains on a CentOS box - and all works as expected. Client's login are authenticated through sasl2 (saslauthd) and pam_mysql. And when a login attempt ...
1
vote
2answers
261 views

How can I allow users to change their local passwords?

We use an LDAP-server, but we also use local accounts. [jdoe@tst-03 ~]$ passwd Changing password for user jdoe. Changing password for jdoe. (current) UNIX password: Enter login(LDAP) password: This ...
0
votes
1answer
218 views

LDAP queries for local users

Recently, in the company where I work, we have had a general system crash and we are figuring out the causes. Our machines are configured for LDAP authentication plus some local users in some of them. ...
0
votes
0answers
360 views

pam-auth-update without the text UI

Is there a way to run pam-auth-update (or some equivalent command), non-interactively on Ubuntu 12.04. I'm trying to automate this process for a number of machines, and the curses interface is making ...
1
vote
1answer
173 views

vsftpd + vitual users + selinux

I can't make vsftpd to work and it is driving me crazy. The virtual users can connect, but they can't upload files or create folders. I hope someone can help me. I get this error in the ftp client: ...
0
votes
2answers
459 views

PAM LDAP configuration for non-local user authentication

I have a requirement to allow non-local user accounts to be logged in via LDAP authentication. Meaning, the user that is trying to login is allowed access, if the user account exists in LDAP server ...
3
votes
3answers
413 views

Is there a command line two-factor authentication verification code generator?

I manage a server with two-factor authentication. I have to use the Google Authenticator iPhone app to get the 6-digit verification code to enter after entering the normal server password. The setup ...
2
votes
0answers
137 views

Trying to script rsync using pam_exec

I'm trying to write a bash script that will execute rsync when called by pam_exec. I've tried a couple different ways, and I'm not sure what I'm doing wrong. When I try to run the script at login by ...
1
vote
1answer
612 views

530 Login incorrect - vsftpd w/SSL (Not using PAM?)

I cannot log in with any local users on my vsftpd running on CentOS6 32-bit. The server simply reports login incorrect. My log files look like this: [doctorblue@guardian ~]$ sudo tail ...
1
vote
1answer
652 views

pam_tty_audit apparently not working

I just compiled pam_tty_audit module, because my Linux distro doesn't include it with the usual PAM modules. I included to the /etc/common-session the configuration line, as suggested in this ...
5
votes
4answers
441 views

Locking a user's account locally when kerberos is enabled

I'm trying to set up Chef-managed accounts for a group of machines with the following characteristics: If there is no local account, login is blocked. If there is a local account with SSH keys, use ...