Use this tag for questions relating to authentication mechanism (i.e. proving to the system that you are you, using passwords, keycards etc.). In general don't use this and the security tag on the same question, unless it is about the security of the authentication process.

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2
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1answer
2k views

Script to get file from SFTP and run it

We have 5 servers running our code: A, B , C, D and E. From a local machine, we sftp the file to A. Then ssh id@A su - applicationname sftp id@A get <file> bye tar -xzf <file> logout ...
2
votes
1answer
362 views

n-factor SSH authentication for CentOS 7

How can I enable (and require) n-factor authentication for all SSH connections to a CentOS 7 server? I have read about Google Authenticator, which provides two factor authentication. But that is ...
2
votes
2answers
376 views

temporarily disable login using one specific ssh key

On my server, I have several public SSH keys in ~/.ssh/authorized_keys. I would like to temporarily block/disallow/deactivate one key. I want to prevent the user to log in using this key now. but I ...
2
votes
1answer
855 views

How do I reset RHEL6 to autocreate home directory upon login?

I am using a RHEL6 host that is set up using LDAP for authenication. Upon first login it is supposed to create the home directory for the user (e.g. /home/gisle where gisle is my login username). I ...
2
votes
2answers
548 views

How do I switch from /etc/shadow back to /etc/passwd?

I'm playing with a rather old, heavily customized Linux installation (based on Debian etch, running on a Netgear ReadyNAS device). Recently I've switched from /etc/passwd to /etc/shadow via pwconv. ...
2
votes
1answer
5k views

Authenticating with x11vnc: what's the difference between -auth and -rfbauth?

I'm on xubuntu 11.10 trying to setup x11vnc server. I followed instructions here and I can connect to VNC server - but it never asks me for password! Is there a difference between these 2 options: ...
2
votes
1answer
8k views

How to setup proxy authentication in the Debian shell?

I think that once I used export http_proxy=http://user:password@address:port/ successfully. But now when I use wget it shows Error parsing proxy URL http://user:passwordaddress:port/: Bad port ...
2
votes
2answers
1k views

setting up ssh public key

Okay, so I'm trying to setup a login for logging in with ssh, using a public key. First, I am using puttygen to generate a rsa-ssh2 public key using a passphrase. I followed the directions and ...
2
votes
1answer
65 views

SSH: display warning when using (deprecated) ssh-dss key

With the 7.0 release, OpenSSH disabled ssh-dss keys. The not-so-recommended workaround is to explicitly re-add DSA key support to .ssh/config, which will eventually be dropped by a later OpenSSH ...
2
votes
1answer
44 views

Is it possible to have a daemon run a process as another user WITHOUT having a superuser daemon?

I'm working on a project at the moment where I have a daemon that needs to run a process as another user. I would like the daemon to not run as root if possible. However, i'm struggling to figure out ...
2
votes
1answer
2k views

how to pass a password with a cron job safely?

I have a site map generator script placed in this URL http://www.mydomain.com/admin/sitemapgen/ However this URL is protected with an username and a password in auth_type basic method. I need to ...
2
votes
1answer
346 views

What's the correct way to authenticate a user without PAM?

as my related question doesn't seem to get much love, here another one: What's the proper way to authenticate a user via username/password prompt in Linux nowadays? In principle, I suppose I would ...
2
votes
1answer
195 views

Apache authentication mutiple domain but same subdirectory

I've got several sites: example.com, example1.com, and example2.com in my wordpress. All of them point to my server's /public_html folder, which is my Apache root folder. What do I need to add to my ...
2
votes
2answers
185 views

Making su ask for password multiple times

Is there some way to make su ask for the password again in case of a wrong password (just as sudo does)? Initially I thought of this: while ! su -c foo; do read -n 1 -p "Retry(y/n)?" ch if [[ ...
2
votes
1answer
595 views

login 'authentication failure' by non-root user, can login only by root [closed]

In my CentOS 6.0 system, working since months, suddenly stop authenticating non-root users, in graphical mode. I have checked necessary /etc/pam.d/* files, but those are unchanged. SELinux is ...
2
votes
1answer
797 views

Gnome-shell authentication dialogue fails, how to debug which app is using it?

I am using ubuntu 13.10 with gnome shell 3.8.4. I used to use gnome online accounts for empathy and other things, but then I stopped using them. And then gnome shell started to show authentication ...
2
votes
1answer
3k views

tinyproxy with user authentification

Does anybody have a solution that'll make tinyproxy work with user authentification like pam_auth at the squid proxy? I don't want to create a SSH-Tunnel and allow only localhost.
2
votes
2answers
1k views

SSH on my local network - problem with login

I'm having problem with logging into my local-network-linux (server) ssh with Putty (and with Linux terminal, too) When my server shows me request to insert username, I insert "root" and I do press ...
2
votes
1answer
77 views

How to allow unauthenticated logins over ssh on FreeBSD?

I created an account ckurs on my FreeBSD 10 workstation. This account uses a custom shell-script as a login-shell that attaches the user to a tmux-session in read-only mode. I have sufficiently ...
2
votes
1answer
2k views

Setting up connection to WPA2 Enterprise (PEAP/MSCHAPv2) with two-level certificate

For a long time, I have been able to use NetworkManager + wpa_supplicant as configured in Debian 7 to connect to a secure wireless at work (which is WPA2 Enterprise, with PEAP + MSCHAPv2 ...
2
votes
1answer
55 views

Configure OpenSSH server not to require password *or* key for a particular user

For the purpose of a training session, I'd like to make it possible for a particular user to connect without requiring a password or key-based authentication. I do not know the IPs or other data of ...
2
votes
1answer
990 views

CUPS not working correctly after Debian Wheezy -> Jessie upgrade because of a faulty libpam

I just upgraded a Debian Wheezy to Jessie, by changing the /etc/apt/sources.lst. If important: I pinned systemd to stay with sysvinit, and after the upgrade I removed the pin. If I now do apt-get ...
2
votes
1answer
55 views

Directory Server doing lookups on one ldap server and authintication on another ldap server

I have an old Centos Directory Server and a new 389 Directory Server. I don't want to use sssd at the moment so lets keep that suggestion off the table. I do the following my RHEL 6.4 servers: ...
2
votes
1answer
173 views

iptables, what is truly open?

We have an RSA appliance, I've reviewed the firewall rules on this appliance to determine what ports are enabled. To me, it looks like its wide open; but the vendor states that I am wrong about this, ...
2
votes
1answer
85 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 ...
2
votes
1answer
367 views

public key authentication without authorized_keys file

I have a lot of ssh public key logins on a Linux server, e.g.: Jul 25 11:41:01 host sshd[24594]: Accepted publickey for root from xxx.xxx.xx.xx port 33374 ssh2 This is strange for me since there's ...
2
votes
1answer
177 views

Obtain pop-id or IP address when client logs into Dovecot server

Background I have been doing some research on the Dovecot mail server documentation on ways to get client information when a client connects to the server. I am interested in using these to program an ...
2
votes
1answer
409 views

Restrict two way SSH and Apache authentication to non-local networks

I am using Google's open-source PAM module for two-way authentication for SSH logins and certain Apache directives. It works great, however I would like to use this only when trying to log in from an ...
2
votes
1answer
3k views

User authentication over Dante proxy server

Below is my Dante SOCKS Proxy server configuration that I connect to without any authentication: internal: eth0 port = 53200 internal: 127.0.0.1 port = 53200 external: eth0 clientmethod: none ...
2
votes
2answers
1k views

How to send mail from a remote SMTP host?

I have Postfix suite installed locally on Ubuntu 10.10. I can send/receive mail to my local address, e.g. user@local.com. I'm given credentials to a remote mail server mailbox, e.g. ...
2
votes
0answers
58 views

Linux Authentication Flow (NSS -> PAM -> AD)

I am a new system administrator at an organization looking to understand the process flow of authentication in regards to how NSS, PAM and WINBIND work together. We've been having winbind related ...
2
votes
4answers
179 views

Authentication failure on Amazon Linux

There is an authentication failure when I'm trying to enter password for any of my accounts. I am logged in using ssh to my AWS EC2 instance. After a while I checked the privileges to files that ...
2
votes
1answer
943 views

LDAP Authentication on OpenBSD

I'm trying to get an OpenBSD server to authenticate users using the same LDAP server the rest of my home network uses. While 'getent password' lists the users from the LDAP server as expected, I ...
2
votes
0answers
192 views

Login to Linux using a trusted Active Directory

I'm having trouble to log in to Linux using a trusted Active Directory. The machine is connected to an Active Directory that we are responsible for in the project, but most of the users who will use ...
2
votes
1answer
504 views

DSA/RSA keys work with Linux but not HP-UX

I have an NFS mount that I use to log into many Linux/Unix servers. I created a passphraseless RSA and DSA key from with I copied the id_rsa.pub and id_dsa.pub files over to authorized_keys. total 9 ...
2
votes
1answer
378 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 ...
2
votes
1answer
4k views

A messagebox keeping popping up in my centos VNC server asking to change proxy settings?

I have included a screenshot of what it looks like. It keeps appearing and in the morning you to close it 50 times. Could you please help me identify where the problem lies? NOTE: It's CentOs 6 ...
2
votes
0answers
1k views

Enter user authentication details for a printer?

I have a printer which is configured using the correct drivers. However, the printer requires user authentication (i.e. a username and password) to print. Where are authentication details usually ...
2
votes
0answers
303 views

SSH login from external authentication

Here is what I try to accomplish: I have a server with a git repository. I use ISPConfig as control panel for our websites and I want to integrate the ISPConfig API for email authentication as second ...
2
votes
3answers
643 views

OpenAM to OpenLDAP to SysAID (LDAP) Authentication

We just began using a new software called SysAid which uses LDAP to authenticate users. We have a client, which uses OpenAM to authenticate their users for a proprietary web application. Our goal, ...
2
votes
0answers
112 views

luks single signon

I've got LUKS (Linux Unified Key Setup) running on a couple of my Linux boxes. I've looked online but haven't seen anyone document how to make it work in a single signon option, but was hoping ...
2
votes
0answers
393 views

SSL Configurations for Intermediate certificate

I had implement a mutual certificate authentication and it worked successfully for following steps : create root ca (self-signed) create server certificate and sign it with ca private key create ...
2
votes
1answer
466 views

Configure SSL Mutual (Two-way) Authentication

I was asked to do it "Configure SSL Mutual (Two-way) Authentication" and I don't know where to start or how to test it . server and many clients . they can access code on server only if they have a ...
2
votes
0answers
3k views

SMTP Auth - SASL on Dovecot, Postfix and CentOS 6.2 (and Open-Xchange)

I am trying to get open SASL to work on CentOS 6.2. I followed this tutorial: http://wiki.centos.org/HowTos/postfix_sasl I suspect it works perfectly for CentOS 5.x so all I really need is an update ...
2
votes
0answers
2k views

nsswitch cache and nscd

I have an LDAP directory server installed that stores all the user data in one server and I have an ongoing authentication mechanism using pam to request user information from it. This works very ...
2
votes
1answer
41 views

manually redirecting X output through ssh

I have a remote server, on which I am able to log in with ssh. However there is no home directory for my user. When I try to ssh -X to that server, ssh tries to put a cookie into ~/.Xauthority which ...
2
votes
3answers
2k views

How to do svn update without password on crontab [closed]

I'm new to svn and ssh. I'm trying to do svn update of 5 repositories in my local system every 3 hours on crontab. So, to achieve this I have setup ssh passwordless login using the below steps: ...
1
vote
2answers
25k views

SSH authentication using gssapi-keyex or gssapi-with-mic (publickey not permitted)

My company has disabled SSH public key authentication, therefore I have to manually enter each time my password (I am not suppose to change /etc/ssh/sshd_config). However gssapi-keyex and ...
1
vote
1answer
6k views

How to authenticate a user with PAM, that is not the user that started the application

I'm currently developing an authentication module for an application. The decision was made to do this by using PAM. I have made this work but it can only authenticate the user that started the ...
1
vote
2answers
61 views

mounting a CIFS filesystem directly or via fstab

I am encountering a problem in which mounting a remote CIFS server without an fstab entry works, but mounting through fstab does not. The following command works: $ sudo mount -t cifs ...