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.

learn more… | top users | synonyms

3
votes
4answers
2k views

How to increase max FD limit for a daemon process running under a headless user?

To increase the FD limit for a daemon process running under a headless user on a Ubuntu Linux machine we did following changes in /etc/security/limits.conf soft nofile 10000 hard nofile 10000 We ...
0
votes
1answer
18 views

tacacs+ for Linux authentication/authorization using pam_tacplus

I am using TACACS+ to authenticate Linux users using pam_tacplus.so PAM module and it works without issues. I have modified the pam_tacplus module to meet some of my custom requirements. I know by ...
1
vote
3answers
716 views

Is anyone using access.conf and netgroup authentication with sssd?

I want to be able to authenticate users (via ssh) to specific groups of hosts based on the users' LDAP netgroup membership. The LDAP server is dsee7. The distro is OEL 6.5 with openldap as the client. ...
4
votes
2answers
1k views

vsftpd - PAM - MySQL and pam_mkhomedir to create directories

I've been successfully using vsftpd with virtual users connecting with PAM to my mysql DB. Now I'd like to automate creation of user directories with successful vsftpd connection. Here is ...
1
vote
1answer
33 views

vsftpd freezes after failed pam_script authentication

I have an Ubuntu 14.04 server with vsftpd and pam_script installed using apt-get. I've configured vsftpd to use pam_script for virtual user authentication and my /etc/pam.d/vsftpd file looks like ...
1
vote
2answers
37 views

How to filter ldap user logins on linux?

I have several linux servers (ubuntu 12.04) setup to authenticate user logins over an external (to my branch office) LDAP (Novell Edirectory specifically). This is working well, however I am trying to ...
0
votes
1answer
935 views

How does changes in /etc/pam.d/common-session-noninteractive affect fail2ban and possibly other programs/services?

Fail2Ban on Ubuntu 10.04 Configuration files /etc/fail2ban/jail.local [DEFAULT] ignoreip = 127.0.0.1 bantime = 10 # made for test purposes maxretry = 3 backend = polling destemail = ...
1
vote
1answer
22 views

What's the downside of disabling PAM in OpenSSH if only public-key login is allowed?

/etc/ssh/sshd_config by default has the following line UsePAM yes I read through available documentation and came to the conclusion that PAM is not used if I only use public-key login. What ...
0
votes
0answers
22 views

ProFTPd won't allow me to log in after password change

I've changed a password for one of my users (using passwd username), and now ProFTPd won't allow that user to log in. Other users can still log in as normal. I'm running Ubuntu 14.04 LTS The error ...
0
votes
0answers
24 views

pam_mount not working when logging in from ssh or console

okay so i configured pam_mount on my centos 6 machine as i did on my centos 7 and 5 machines. But when i login locally or via ssh, pam_mount can't mount my home dir. when i login with a local user, ...
2
votes
1answer
999 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
votes
1answer
82 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 ...
0
votes
1answer
34 views

How to override a user's UID coming from an LDAP directory?

I am trying to setup Linux logins for users in an LDAP directory. The directory contains users which have a UID under 1000 and I believe this is causing problems with logins to those accounts as UID ...
4
votes
4answers
321 views

FreeIPA: prevent local root accessing user accounts

So after asking this question, I've been test-driving FreeIPA as a central authentication source. Managing access to multiple linux system One problem I ran into is that if a user is given local root ...
0
votes
1answer
30 views

pam_mount on centos won't mount cifs

so I have this problem that pam_mount won't mount my cifs home dirs pam_mount has this in /var/log/messages: Feb 3 15:49:18 centosy nslcd[1278]: [3c9869] <passwd="tomas"> (re)loading ...
2
votes
1answer
1k views

pam_unix(sshd:auth): auth could not identify password for [admin] - sshd[6968]?

Why is the following log produced? pam_unix(sshd:auth): auth could not identify password for [admin] - sshd[6968] Is it because of a timeout, or is there some other reason?
1
vote
1answer
26 views

Can I configure pam_ldap without configuring nss?

On my servers I have my system users provisioned with Chef and have no desire to expose any additional users to these machines. I would however like to utilize pam for the authentication backend for ...
2
votes
2answers
44 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 ...
1
vote
1answer
2k views

libpam-ldapd not looking for secondary groups

I'm migrating from libpam-ldap to libpam-ldapd. I'm having some trouble gathering the secondary groups from LDAP. On libpam-ldap, I had this on the /etc/ldap.conf file: nss_schema rfc2307bis ...
1
vote
2answers
66 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 /] # ...
0
votes
2answers
49 views

sendmail & sasl auth on CentOS 6

I'm moving a mail server from one CentOS 6 to another. I use sendmail with sasl pam authentication. When I try to send mail it fails because the user is not authenticated and the mail client does not ...
6
votes
2answers
10k views

Account Lockout with pam_tally2 in RHEL6

I am using pam_tally2 to lockout accounts after 3 failed logins per policy, however, the connecting user does not receive the error indicating pam_tally2's action. (Via SSH.) I expect to see on the ...
-2
votes
0answers
57 views

pam_mysql missing in CentOS 7

So it looks like in Centos 7 the pam_mysql package has been removed from EPEL, but I'm still in need of this package do to my reliance on a remote mysql database used for vsftpd. I stumbled on a ...
0
votes
2answers
38 views

Linux smart card authentication

I am using puttysc to authenticate to a remote Linux server with my smart card . But as I understand, this isn't true PKI authentication - puttysc just unlocks the public key and matches it to a user ...
6
votes
3answers
2k views

libpam-ldap or libpam-ldapd?

I'm setting up LDAP authentication on my personal VPS, and Ubuntu has two packages for the same purpose: libpam-ldap and libpam-ldapd. Which should I use?
10
votes
1answer
207 views

What do the OS X authorization mechanisms actually do?

Background  I'm trying to glean a better understanding of the OS X login process, in order to decide the best way for achieving VPN Single Sign On. Please do correct me if I'm wrong, but I believe ...
2
votes
1answer
1k 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 ...
2
votes
1answer
52 views

fail2ban did not ban anything, regardless of the settings

this is the first time that i did not find a solution here. so, hopefully it can be solved. i've installed a fresh, new ubuntu minimal system (14.04) with ssh on it. Right after that i installed ...
0
votes
0answers
47 views

pam_tally is not supporting user locking after failed attempts on CentOS

After adding the below configurations in /etc/pam.d/system-auth. The user account is not getting locked after multiple failed attempts. As per the below configuration the account should be locked ...
1
vote
2answers
40 views

Configuring PAM with Augeas

I am attempting to use Augeas to configure the files in my /etc/pam.d directory in a default Ubuntu 14.04 install. My goal is to find all nodes that have an argument of either 'nullok' or ...
0
votes
1answer
143 views

Can sssd-ldap authenticate non-posix users?

I am migrating a sealed MSA from using pam_ldap to pam_sss (sssd-ldap). However, pam_sss seems to have having trouble authenticating users without uidNumbers. I had thought changing ...
1
vote
4answers
12k 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: ...
0
votes
1answer
167 views

su: Authentication failure

I have Ubuntu 14.04 server on which I can't use anything that relies on su. This manifests in inability to restart services or even switch users. root@ci-web1:~# su - mxx su: Authentication failure ...
2
votes
3answers
162 views

PAM, RADIUS, Google Authenticator and Two Factor Auth

I have setup FreeRADIUS, PAM and the Google Authtenicator. FreeRADIUS calls PAM, which in turn calls the Google pam_google_authenticator.so libary. That all works successfully. However, that's not ...
1
vote
2answers
109 views

Sending automatic mail on ssh-login fails

I'm trying to let my server send me automatically an email on ssh-login. What I've done: Created a login-notify.sh file (user root, group root, chmod 755) and placed it inside /etc/ssh/ #!/bin/sh ...
2
votes
0answers
131 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 ...
0
votes
0answers
40 views

Postgres on OpenSuse doesn't start after update

I tried to upgrade OpenSuse from 12.1 to 13.1 and after 'zypper update' and reboot Postgresql doesn't start. Here is the output of service postgresgl status: postgresql.service - LSB: Start the ...
12
votes
6answers
9k views

pam service(sshd) ignoring max retries

I have vps that I use to run a webserver on, it currently runs ubuntu server 12.04. Since a few weeks I keep getting a lot of errors in my ssh console. 2014 Apr 11 08:41:18 vps847 PAM service(sshd) ...
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
119 views

imapd-ssl: admin: No such file or directory

I am trying to set up my VPS so I can use Thunderbird IMAP to manage my mails. First, I installed postfix and followed this guide to create an SSL certificate. Then I installed sasl2-bin and ...
3
votes
4answers
4k views

limits.conf not being applied.

I have the following lines in /etc/security/limits.conf * soft nofile 32768 * hard nofile 65536 root soft nofile 32768 root ...
-2
votes
2answers
58 views

How do PAM advanced options work, exactly?

I've been reading everything I can find on PAM (e.g. http://wpollock.com/AUnix2/PAM-Help.htm), however I'm still confused about how precisely the advanced options are supposed to work. For example, ...
4
votes
1answer
114 views

Practical ulimits

One of the projects I'm working on is moving certain puppet-applied ulimit settings away from "that sounds about right" to dynamically allocated based on the environment. This is for ...
1
vote
0answers
30 views

pwauth kerberos authentication specifying default and secondary servers

I am currently using Kerberos authentication for Basic Authentication on Apache using pwauth and mod_auth_external. I would like to add multiple servers to authenticate from, however they would have ...
1
vote
0answers
262 views

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 ...
2
votes
1answer
6k 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 ...
0
votes
1answer
34 views

Chrooted user logged out immediately after login

I am trying to use chroot to setup a user who can login via ssh and limit access to the /var/www directory. The server is on AWS running Amazon Linux 64-bit, openssh installed. I used ssh-keygen to ...
2
votes
1answer
3k views

LDAP authentication on CentOS 7

After upgrading to CentOS 7 it's no longer possible to login via LDAP. With CentOS 6 I used the package pam_ldap which worked fine, but now pam_ldap is no longer available for the new version of ...
3
votes
11answers
9k views

Restrict root ssh from all but one IP/hostname

I'm wanting to restrict root ssh login coming from all but a single IP address. I was under the impression that I just had to add this to /etc/pam.d/sshd: account required pam_access.so and this ...
2
votes
1answer
194 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> ...