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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3
votes
1answer
655 views

mod_authnz_ldap bind as authenticating user instead of anonymously

I'm attempting to move as close to single credential as possible. We have a web application that has a fairly limited set of available authentication mechanisms but will (luckily) allow admins to tell ...
3
votes
2answers
7k views

Using curl to access basic auth protected website via proxy (polipo)

I am trying to download a file protected via basic auth: curl "http://User:Pass@example.com/blub/bla.bin" This is working fine. As soon as I tell curl to use my locally installed polipo it fails: ...
3
votes
1answer
110 views

How to set an expired authentication in Apache?

Using a simple virtual host, I've to set a timeout after X minutes (same of set an expired authentication) to force the user to re-insert its credentials. [...] <Directory /home/user1/> ...
3
votes
1answer
893 views

Firefox error message when adding client certificate signed by CA

I'm getting this message when I'm trying to add a certificate to Firefox's "your certificate tab". I generated and signed it before by a server which also is a CA. Failed to decode the file. ...
3
votes
1answer
256 views

Invoking PolicyKit/polkit via xinit/startx?

I recently upgraded a minimal installation of Ubuntu (with no full-fledged DE) from precise to saucy and since doing so I'm no longer able to mount removable drives as a normal user. I googled a bit ...
3
votes
1answer
8k views

Meaning of “Connection closed by xxx [preauth]” in sshd logs

We have a Windows batch script, which connects automatically to a linux server via PLINK (putty). There is NO public private key authentication, the user and the password are in the script. On our ...
3
votes
1answer
450 views

Multiple PCs network centralized system authentication

(I couldn't really choose an accurate title as I don't know exactly what the feature I'm looking for is called. Sorry about that. I hope that the following lines may clear this aspect.) I own a dozen ...
3
votes
1answer
3k views

Where to supply authentication details to the Network Proxy (Central Proxy) on Fedora?

My system is running Fedora 16 and I live in a campus where we use LAN to connect to the Internet. And for this, we use an http proxy with authentication (username & password). I tried putting the ...
3
votes
1answer
462 views

What's the best way to install a system-wide certificate from a website?

I want to use the Cisco Easy VPN to connect to the OpSource cloud machines. When I open the app, it directly shows a certificate error message, I suspect that the certificate is not trusted from their ...
3
votes
0answers
119 views

WGET - Authenticating root AND all children folders

Before I start the question off, I want to say that a similar question helped me get past the initial login. My issue is as stated below. There's a website that I'm trying to mirror. It is something ...
3
votes
1answer
289 views

Configure applications to ask for a user:pass behind a proxy

Here's the deal: I'm trying to set up a SQL server with Debian Linux, I managed to install Debian - but I can't get apt-get to work, since I'm behind a proxy. I already managed to setup Iceweasel to ...
2
votes
3answers
167 views

Can sudo replace su?

There is much duplication of functionality on Linux-based systems, for example these do the same thing: sudo --login --user <user> sudo su - <user> The sudo-only approach looks more ...
2
votes
3answers
831 views

rsync server/daemon security

I have a NAS (Netgear Readynas NV+) at home and a linux (Arch) box at work that is always on. The linux box is already running an ssh server/daemon and the NAS is already running an rsync ...
2
votes
2answers
2k views

How to get hashed password in /etc/shadow using getpwnam()?

Apparently there is a function (getpwnam) that given a username, will return the appropriate entry in /etc/passwd with the other details for that user (shell, uid, gid, etc.). However, I have no idea ...
2
votes
2answers
693 views

ssh login in Bash script

I've been working on a series of scripts to perform tasks on my remote server, but have gotten stuck at how to log in via ssh mid script, as I cannot enter the password automatically. Is there a way ...
2
votes
5answers
76 views

Simulate the remote host identification warning

I need to simulate the warning: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING ...
2
votes
1answer
58 views

Does root not require a password to log in as a user?

Does root not require a password to log in as a user even though a password has been set for that user? When I am logged in as "root", su user logs me in as "user". There is no prompt for a password. ...
2
votes
1answer
1k 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
4answers
15k views

vsftpd fails pam authentication

Moving a tried-and-true vsftpd configuration onto a new server with Fedora 16, I ran into a problem. All seems to go as it should, but user authentication fails. I cannot find any entry in any log ...
2
votes
2answers
33 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
487 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
252 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

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
40 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
2answers
89 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
165 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
419 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

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
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
50 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
236 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
82 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
969 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
1answer
643 views

Where does Samba 4 store user passwords?

Where does Samba 4 store user passwords? How can I import my password hashes from Samba 3 in Samba 4? I am using my own LDAP server with samba 3, and the password hash is stored within the ...
2
votes
1answer
254 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
2k 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
1answer
12 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
35 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
0answers
17 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
107 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
0answers
822 views

Setup LDAP client on RHEL 6.5

I am preparing for RHCSA exams and trying to setup LDAP client on my RHEL 6.5 box I am connecting to the online testing LDAP server Here I don't understand the relationship among following 3 files, ...
2
votes
0answers
247 views

recover email from imap account using mailx

I am having problems fetching emails with mailx. My imap account uses ssl/tls connection with normal password authentication on port 993. I don't have any problems sending through smtp though. Here is ...
2
votes
0answers
721 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
322 views

Is there an alternative to OpenLDAP / Kerberos? [closed]

Are there ways to do centralized secure network-based authentication & authorization and user management that aren't OpenLDAP and Kerberos? Frankly, Kerberos is a nightmare to configure, leaving ...
2
votes
0answers
187 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
0answers
1k views

WBC_ERR_DOMAIN_NOT_FOUND only for a specific account

Platform: RHEL 5.10 Version: Samba 3.6.6-0.136 Only on a single VM, one of my co-workers is able to log into the VM using his AD credentials without issue, whereas my account appears to have trouble ...
2
votes
3answers
323 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
73 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 ...