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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How to make Exceed-on-demand reload the PAM configuration?

after a change in the PAM configuration, I'd like to have Exceed-on-demand reload the PAM config, as it seems it not automatic... Is there a way to do it without killing all the running sessions?
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17 views

How to get rid of “Authenticated with partial success” message when using two factor authentication

On my linux machine I am writing a PAM module for two factor authentication (https://github.com/kb100/signal-authenticator). It works on an opt in basis so if a user doesn't have a ....
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1answer
27 views

What PAM service name does useradd use?

The title says everything, but to show that I did my research, I will say that I spent almost half of the day yesterday trying to find the answer for that question. I have run into one page where it ...
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0answers
59 views

Force OpenSSH server to accept nonexistent usernames?

Can sshd be configured to accept a nonexistent username and log in as a predefined user, such as guest? For example, if I enter ssh nxuser123@localhost, sshd should save "nxuser123" in an environment ...
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34 views

Disable expired password change dialog in PAM

I try to find a way to switch off the password change dialog you get when you login with a expired password. """ WARNING: Your password has expired. You must change your password now and login again! ...
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1answer
143 views

PAM SSSD Allow Local Users

I've got a default SSSD configuration with PAM. I can login fine as any LDAP user. However, when I create a local user on a server: adduser test1 passwd test1 and then try to login as that user I ...
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1answer
35 views

Debian wheezy pam and samba

I installed a Debian server into a Windows controlled domain. I then tried to give to LDAP users from this domain access to my Debian via Samba, Winbind and Kerberos, which works almost perfectly. In ...
2
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1answer
197 views

Public key authentication for LDAP users using local authorized_keys

We are using LDAP for account information. The environment is configured as follows ... A CentOS 7 OpenLDAP directory server A CentOS 7 client configured to use the directory server authconfig has ...
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2answers
11k views

/etc/security/limits.conf for setting program limits in Linux

I have the following inside /etc/security/limits.conf (I have specified root separately because * will not include it.) user2 - core unlimited * - core 0 root ...
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129 views

Autologin and mount encrypted volume in KDE 5

On my machine, I have Fedora 23 (Server) and KDE 5.19. SELinux is deactivated. Furthermore, I have an encrypted home volume (using LUKS). As soon as the user logs in on the SDDM greeter, the encrypted ...
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1answer
194 views

passwd fails with passwd: pam_start() failed, error 26 in tahr puppy 6.0.2

From the messages log: Dec 17 08:08:28 puppypc30098 authpriv.err passwd[8265]: PAM _pam_load_conf_file: unable to open /etc/pam.d/common-password The file /etc/pam.d/common-passwd is indeed missing:...
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167 views

Mount encrypted partition after login (LUKS/pam_mount)

During the installations of Fedora 23 I have chosen the option to encrypt the /home partition. As expected, I am asked now to enter the passphrase before the login appears. Now, I have to achieve that ...
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130 views

Ulimit is set on second login, not first

I'm using Debian Jessie and I have a strange error connected with setting the limit of open files per process. I want to increase the default limit for certain user (me), so I added to /etc/security/...
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2answers
127 views

Is it possible to define a custom basepath for proftpd home directories?

I know the DefaultRoot ~ setting that you can use to jail users into their home directories but I need to customize this. When authenticating with proftpd I get the user's home-directory from ldap ...
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97 views

Loading kerberos keytab from root cron

When I run a script (see below) to load a kerberos keytab from a users cron it works just fine. Running it from root cron however a password is asked for the keytab and it aborts with: kinit: Generic ...
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2answers
2k views

Crontab command cannot be executed. Error PAM configurations

Here's the command that I would like to execute but it seems not to work. [mdubois@veloce ~]$ crontab -l Autorisation refusée You (mdubois) are not allowed to access to (crontab) because of pam ...
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33 views

How to force users to change password according to policy standard in Debian Linux

In Linux how do I force users to change password according to standard only (that defined in /etc/pam.f/passwd)? I read that pam_cracklib.so only tells user that password is not according to standard ...
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85 views

How to determine the source(s) of PAM authentication attempts?

I see persistent authentication attempts in /var/log/messages: Jan 13 02:00:05 ns1 saslauthd[912]: do_auth : auth failure: [user=manager] [service=smtp] [realm=] [mech=pam] [reason=PAM auth ...
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12 views

PAM select authentication

Is there an existing mechanism for allowing a user to choose one of various authentication means? Suppose I have a 2FA system set up: Password Second factor TOTP U2F device Possibly other 2nd ...
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108 views

Centos 7 pam_tally2 not working

I have edited /etc/pam.d/password_auth to block users logging in from ssh with 3 fails: I have added the pam_tally2.so lines: #%PAM-1.0 # This file is auto-generated. # User changes will be ...
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19 views

Pam.d not enforcing

I am having an issue with pam.d, I configured the system-auth file with: password requisite pam_cracklib.so try_first_pass retry=3 minlen=x difok=x lcredit=x ucredit=x dcredit=x ocredit=x type=...
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1answer
55 views

Ubuntu Trusty not showing “System restart required” on first login after unattended-upgrades

I'm running ubuntu 14.04.3 with unattended-upgrades configured to install security updates only. This works as expected, with email notifications as follows when a reboot is required: Unattended ...
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1answer
315 views

Minimum password length is not working in Linux (RHEL7)

I have set minimum password length to 3 on my RHEL 7 system. Still while using passwd I get error: BAD PASSWORD: The password is shorter than 5 characters. I have changed following parameters: ...
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12 views

Adding groups on the fly using PAM

I am using Ubuntu and I've modified group.conf file adding the following line xsh;tty*;username;Al0900-2100;group but I am not getting added to this group. Why is that? Should I do anything else?
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1answer
58 views

Authentication working with partial password

I have a 13 character long password and my system is allowing me to authenticate with only 8, why? I have no clue at all, so please give me some guide on what to add to my question, for instance ...
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1answer
495 views

pam_exec.so doesn't write password to script when expose_authtok is enabled

We are using PAM for authenticating with external radius server. We have the following line in /etc/pam.d/common-auth auth [success=6 default=ignore] pam_exec.so expose_authtok /home/cliuser/...
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3answers
5k views

How do I permanently delete /var/log/lastlog?

My /var/log/lastlog file is huge. I know it's really only a few kilobytes, but tar isn't smart enough to know that, so when I image a virtual machine, my restore fails because it thinks I'm trying to ...
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179 views

ConsoleKit reports active/is-local only on the second+ login

Running KDE Frameworks 5, Plasma 5, using sddm as a display manager. ConsoleKit and PAM-linux are both installed. Upon login (using the sddm login screen), ck-list-sessions returns FALSE for both is-...
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2answers
2k views

Prevent linux user from changing their password in ssh

How can I prevent users from changing their passwords? I still want to be able to change the passwords as root if necessary but keep the user from changing their password.
2
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2answers
1k views

Linux (Ubuntu) USB Auth

I want to be able to authenticate with PAM using a USB drive with a file on it. I've read about how to do this with a PAM module that reads the specific USB hardware ID of a device, but if the device ...
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4answers
11k views

How do I disable or modify pam's password requirements?

I'm using Fedora 19. By default it's setup with pam to disable bad passwords, like "password". This is good. Trying to change this default is infuriating. This is a box for testing internal stuff, not ...
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1answer
195 views

Authentication Failure Upon Successful Login

I was reveiwing the logs when I was successful in logging into a workstation - however in the in the var/log/secure log it is logged as > gnome-screensaver-dialog:pam_unix(gnome-screensaver:auth): ...
4
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1answer
2k views

PAM Authentication / Login

I'm having a little issue on Ubuntu where any commands that require root privileges takes longer to execute than normal. I managed to identify the culprit to the cause after checking my /var/log/auth....
3
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1answer
832 views

limits.conf ulimits not being applied to chrooted processes

We allow users to execute scripts on our servers. Our security model involves chrooting them. We want to be able to apply ulimit restrictions to them, and the best way to do it would seem to be in /...
2
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0answers
3k views

Samba, winbind and AD authentication: username is invalid on this system

I am trying to set up a file server with Active Directory authentication using Samba and Winbind. Domain controller is Windows 2000 SP4 (don't judge). File server is Debian 7.7 (latest stable). This ...
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0answers
357 views

Samba sync password with Unix

I'm trying to set up Samba to sync passwords with Unix (i.e. when someone changes their password via passwd their Samba password is also changed). I've tried following the "Password Synchronization ...
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1answer
166 views

Change order of two-factor-authentication

I am testing two-factor-authentication for ssh logins on some CentOS containers in our testing environment. I compiled my own rpms from github's source, installed and configured everything and have ...
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1answer
492 views

unable to lock a non-root RHEL account using pam_tally2.so PAM module

I have RHEL 5.5 and making the below change in /etc/pam.d/system-auth file: auth required pam_env.so auth required pam_tally2.so deny=3 onerr=fail auth ...
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1answer
585 views

Where does Debian take the default umask from?

With a fresh ssh login: $ umask 0007 But: $ find . -maxdepth 1 -name '.*' -type f | xargs grep 007 | less $ # grep 007 /etc/profile # # grep -i umask /etc/login.defs # UMASK ...
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48 views

ec2 enable su for user ubuntu

I am trying to enable rstudio-server login with ubuntu on ec2, but it fails. I think it uses the same auth mechanism as su. So I did sudo passwd su someotheruser su ubuntu But even though I know ...
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1k views

Can't perform Kerberos login

I can't do a Kerberos login. I've tweaked rsyslog to record *.debug to /var/log/debug, whose output is below. If I attempt to log in with ssh, I get: Jun 6 23:13:05 foo-machine sshd[13965]: ...
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1answer
155 views

Deploy PAM system-auth file from Configuration Server (Spacewalk)

I have my pam.d system-auth file set up correctly on a laptop to set password complexity requirements. If the contents of the file are copied directly into the /etc/pam.d/system-auth location (or the /...
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0answers
76 views

using pam_mount in WLAN setting

I thought this should be a simple exercise here, but obviously I couldn't find a solution, yet. I use KDE on Ubuntu 12 LTS. I want to use libpam-mount to mount a nfs share to a directory within user's ...
1
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1answer
425 views

pam_tally2 does not show address of the failing user

See this output below: # pam_tally2 -u Login Failures Latest failure From root 1 04/16/14 16:44:16 10.4.1.189 greg 2 04/16/14 16:35:57 unknown ...
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1answer
360 views

Why shadow password hashed with sha512 contains 99 instead of 129 characters?

My Linux is configured to use sha512. Yet, the /etc/shadow file contains hashed password with 99 characters only. Why 99 and not 129 (64*2+1)? Note that I had changed password after making sure the ...
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52 views

Does sequence matter in case of pam_env.so and pam_tally2.so together?

Very short question. auth required pam_env.so auth required pam_tally2.so deny=3 even_deny_root unlock_time=120 or auth required pam_tally2.so deny=3 ...
2
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1answer
1k views

Debian disable su to root user

I am currently using Debian 7 (Wheezy) and I am trying to disable the su command only when the target user is root and not a privileged user. For example, let's suppose the following users exist: ...
2
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1answer
3k views

Is there a way to force all Linux users to change their passwords on first login?

I am looking for a way to configure Linux machine so any time a new user is created, he/she will have to set a new password on first login. To clarify the task here are assumptions: I am not ...
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2answers
3k views

pam mount - my password prompt now says pam_mount password:

I am using pam_mount to mount users' home directory upon successfully logging into the system. It works; however, the password prompt says: pam_mount password: Instead of just: password: How can ...
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0answers
508 views

xrdp with two factor authentication (libpam-google-authenticator)

I'm trying to setup a Debian VM that uses two factor authentication for logins via google-authenticator's PAM plugin. The google-authenticator part is working great through regular console logins or ...