Pluggable Authentication Modules handle authentication tasks of applications or services running on the system.

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While trying to ssh, pam_ldap always sends the password “INCORRECT” causing bind to fail

I installed ldap-auth-client nscd ldap-utils on lubuntu 14.04 running on a banana pi. I can successfully bind as the user using ldapwhoami, but I cannot log in via ssh: Auth.log: Oct 21 02:12:05 ...
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11 views

Integrate my own PAM module with the passwd command

I know that to integrate my module with the passwd command all I need to do is add the following line to the /etc/pam.d/passwd file: password sufficient mymodule.so My question is I want my module ...
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7 views

Externally authenticate user within PAM session/PAM session within PAM session

Is there a way of properly authenticating a user from within a custom PAM session? I am currently writing my own PAM authentication module which allows the user to login via an external token. This ...
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1answer
18 views

How to disallow usage of an LDAP root account

I am responsible for a couple of servers at my university. All of these machines are configured to talk to the LDAP server of my departement to allow centralised user logins. On this LDAP server there ...
16
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3answers
1k views

How to prevent shutdown when an SSH user is logged in?

I'm administrating a networked environment and I had an interesting situation arise yesterday. When a host is required to shutdown by a regular user, it refuses to do so if other users are logged in ...
2
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1answer
63 views

Expired password and SSH key based login with UsePAM yes

There is a SLES 11 machine. The users logs in via SSH and pubkey (mixed, some user uses password, some use ssh key) The sshd_config has: UsePAM yes PasswordAuthentication yes PubkeyAuthentication ...
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0answers
32 views

gksu -S ask for password only once even when set to three times in sudo configuration

I have a problem with gksu command. It always ask for password only once even when I set Defaults passwd_tries=3 in /etc/sudoers file. Command: $ gksu -S --debug ls No ask_pass set, using default! ...
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1answer
554 views

Why does pam_mount ask for password?

I used the pam-auth-update tool in order to enable some pam configuration profiles: PAM configuration PAM profiles to enable: [*] encfs encrypted home directories [*] Unix ...
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3answers
1k views

PAM login permission denied

I have an OpenSuSE 12.3 machine and can't login to the box either on tty or via ssh. As soon as the user logs in the session terminates and in the message "login [1234] permission denied" is printed. ...
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21 views

How to fix Module is Unknown error without logging in (PiLFS)

I've built a PiLFS distribution and was running it fine about a month ago. Now, when I turn on the Raspberry pi and attempt to login as root with the proper password, it gives the error Module is ...
5
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1answer
534 views

Default umask 077 not applied at session start

I cannot get the default umask for a session to be 0077. I have edited /etc/login.defs and set the value to 077 there: UMASK 077 Also I've made sure the following entry exists in ...
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25 views

ACL for a binddn user for PAM?

I've installed 389-ds and created a user and a couple groups. I then configured authconfig on a client to use the LDAP instance to authenticate the user. I've logged in successfully as that user. All ...
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1answer
27 views

What prevents RHEL7 default PAM config's “nullok” option from allowing empty passwords?

The config /etc/pam.d/password-auth is included by several PAM services including sshd. This is its auth stanza: auth required pam_env.so auth sufficient pam_unix.so nullok ...
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1answer
11 views

Unable to login with password as well as otp in pam module

I have a query regarding PAM module on centos. That is, how can I login with user's one time password after user's password on a single screen? Like Username:rohit Password:.... OTP : .... on a ...
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1answer
3k views

rsh shows “poll: protocol failure in circuit setup”, why?

In the starting rsh worked properly, but after making some changes it shows some error [changes are shown in the end of this question, see that], I am sharing the same. Command $ /usr/bin/rsh ...
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1answer
32 views

How to allow pam radius module in centos for user's password as well as one time password

I have a problem with the PAM Radius module. Actually, I have it installed already under CentOS. I've inserted the line: auth required /lib/security/pam_radius_auth.so in /etc/pam.d/sshd and ...
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0answers
11 views

Is there a Linux capabilities(7) to allow a process to execute pam_authenticate?

I am writing a process that needs to periodically authenticate users (i.e. call pam_authenticate()). For security purposes I would prefer not to run this process with root privilege. I can use ...
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5answers
19k views

Program for decrypt linux shadow file

Is there any program or script available for decrypt Linux shadow file ?
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10 views

skip pam_fprintd.so with closed lid

I really love fprintd and I really love having my laptop closed while in docking station. But I hate both together. This is my /etc/pam.d/system-auth: auth sufficient pam_fprintd.so ...
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28 views

PAM authentication program in C recognizes only the logged in user [closed]

I am trying to write a C program to authenticate users using PAM. Here is what I have at present: #include <security/pam_appl.h> #include <security/pam_misc.h> #include <stdio.h> ...
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1answer
32 views

Howto Tell if a System authenticate with password only or through PAM

If my computer has the pam package installed and has the directory /etc/pam.d/sshd, does it mean for sure when I ssh to my computer, I am authenticated through pam modules? The /etc/pam.d/sshd looks ...
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1answer
30 views

Can't load my PAM module - how to diagnose?

I've written a PAM service module, and added it into lightdm by editing /etc/pam.d/lightdm. But lightdm complains (in /var/log/auth.log on Ubuntu 14.04): Sep 9 14:16:48 Ubuntu-build lightdm: PAM ...
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Is it possible to login to a Linux machine with AD credentials without the machine beeing member of the AD?

I'm asking because as far as I know this is not possible with Windows machines since it's mandatory that a Windows machine is known to the AD in order to login with AD credentials. Is it possible to ...
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2answers
92 views

Restrict the times a user is allowed to log in

We have several Backbox 3.13 systems built on Ubuntu 12.04. One of my teenagers does not understand the concept of this thing called "sleep" and tends to get up to play on the computer. I'm trying to ...
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1answer
78 views

Run Script at fail login attempt?

Lately, I've been trying to create a Bash script to capture a webcam photo when a fail attempt to login is registered. First of all, I found 2 guides related to this (links at the end), they explained ...
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2answers
3k views

Ubuntu password policy

I want to set the system-wide password policy on an Ubuntu 12.04 LTS server. Googling around, a lot of people point to this (very old) document: ...
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4answers
642 views

Groups differ from the local ones when logging in remotely

We store our users in LDAP, alongside some groups that have meaning across different systems (organizational roles including wheel). There are also groups local to workstations, e.g. audio or video ...
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183 views

What does “Cannot make/remove an entry for the specified session” mean?

Instead of logging me in, PAM greets me with the message "Cannot make/remove an entry for the specified session" after I enter the password. What entry is it talking about (and what session)? The ...
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44 views

Kerberos Forwarding in SSSD

So, I'm trying to set up forwarding with Kerberos and seem to have some problems. On some of my servers I'm able to forward after receiving a ticket; however, some I'm not. My system setup is a ...
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40 views

pam.d password hardening: nullok

In most all pam.d documentation or linux distributions that I saw, the recommend "secure" configuration for password is the following: password required pam_unix.so sha512 shadow nullok ...
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0answers
59 views

pam_tacplus.so and sshd: skip user validation?

I'm trying to implement tacacs authentication on a freebsd box as a client. The box is actually a network appliance that SHOULD have this config built into its cli/ui but doesn't. Since it's built ...
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2answers
155 views

allow only specific users to login via sshd, but refuse connect to non-listed users

I'm running a CentOS server (7.0) and I'd like to login via sshd as a user, not root. So I set PermitRootLogin no in the config file and su - after login. I've received lots of hacking activities and ...
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1answer
105 views

Send only one warning when the private key is not available

For added security, I would like to require a private key to use sudo on my Ubuntu Server box. I've added private key authentication for sudo as described at ...
2
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1answer
2k views

Centos 7 and VNC access right?

UPDATE: I posted on the Tiger VNC forum and someone suggested that this may be a result of PolicyKit (now called PolKit, I believe). Does anyone know how to change this policy? These are all ...
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76 views

What processes on CentOS6/RHEL regulates user login but not password itself?

I was doing some maintenance via root account over ssh after several months of inattention. I shutdown, after startup I can't log in to root account at tty or via ssh. Fortunately, sudo works to ...
5
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1answer
240 views

2 Factor Authentication in SSH using public key and PAM

I'm trying to setup 2 Factor Authentication. I want the user to login successfully if: The public private/public key matches (authentication method: publickey) or the password is correct My pam ...
1
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1answer
175 views

mount luks volume through pam with gdm

I'm on debian testing. I encrypted my /home with dm-crypt (luks). Following various tutorials I setup pam_mount to open it at login time. However when I try to login using gdm, it fails. The login ...
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80 views

Root able to login but non root users are denied - PAM

One of our servers is not letting non-root users login, but root can login without any issues. The following are the messages from /var/log/secure: Jun 24 18:08:43 jonnserver sshd[14470]: debug1: ...
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87 views

How to make a PAM substack “requisite”?

For the auth section of my PAM configuration, login and mdm etc. call common-auth. I have common-auth calling the following as a substack (as auth substack krb5ldap-cache-auth): auth optional ...
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1answer
221 views

Is PAM a user authentication method?

If someone asks that PAM is a user authentication method? Then can we say yes? Or no?
5
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3answers
50 views

different passwords depending on plugged-in devices

I would like to have different passwords for my account(s): When (e.g.) a certain USB stick is plugged in then an easy password is to be used. The idea is: If I leave my computer then I take the stick ...
44
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2answers
11k views

Why is there a big delay after entering a wrong password?

I notice a weird (well, according to me) thing about passwords. For example, if I type an incorrect password during login, there will be a few seconds' delay before the system tells me so. When I try ...
6
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4answers
2k views

SSH authentication: either SSH keys or one time password

I have an Ubuntu 10.04 Linux server that I normally ssh into (from my home machine) using ssh key authentication. However, sometimes I need to ssh remotely from potentially insecure machines (like ...
2
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1answer
371 views

Home Directories and pam.d using LDAP

Background: I'm not too familiar with the ins and outs of pam and LDAP authentication on a configuration side. I've used systems that use pam but I've only worked on applications, not systems ...
0
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1answer
172 views

Why does PAM prevent root from using useradd?

I'm using Arch Linux on a single-user workstation with LXDE and lxde-session autologin to the regular user. I then "su" or "sudo" to root privileges, and try to run "useradd." useradd fails on my ...
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221 views

Unmounting shares on logout with pam_mount

I am using pam_mount to mount cifs and sshfs shares for users when they log in to an Arch Linux workstation. I have the a volume line in /etc/security/pam_mount.conf.xml: <volume user="strongbad" ...
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2answers
257 views

Change password through linux PAM without running application as root

An application I'm writing will have some password change functionality. However I'm wondering if it is possible to not run the account management part of it as root. Right now I'm running into the ...
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2answers
95 views

Reset password for regular user who is locked out

I'm a complete noob in Linux and I'm stuck in a situation where I'm logged in an Linux box from putty but on of my colleague, who was trying to login on same machine from his machine blocked my user ...
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1answer
116 views

pam-auth-update does not display prompt screen or log any failure

~# lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 12.04.4 LTS Release: 12.04 Codename: precise ~# dpkg -l \*pam\* | grep ii ii libpam-krb5 ...
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1answer
84 views

How does `shutdown -k` disable logins?

This is the -k option's documentation in man shutdown (at least on Ubuntu): -k Only send out the warning messages and disable logins, do not actually bring the system down. I initially ...