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.

learn more… | top users | synonyms

4
votes
2answers
2k views

Git-SVN Not Allowing Me to Authenticate

Git 1.7.9.1 on Arch Linux: git svn init -s https://app.svn.beanstalk.com/repo Initialized empty Git repository in /path/to/repo/.git/ Authentication realm: ...
4
votes
1answer
672 views

Configuring Apache to Require a Client Certificate

I want to implement mutual authentication (two - way ) with apache web server. References : 1.Failed to sign CSR with the CA root key 2.Firefox error message when adding client certificate ...
3
votes
1answer
83 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. ...
3
votes
2answers
135 views

SSH when to use public key and password?

I think I understand the difference between Public Key authentication and Password. But how do I decide which one to use and which one is most secure in what situation? Can anybody give me some real ...
3
votes
2answers
11k views

su - user doesn't work for users without a password

I've created a user on CentOS with useradd -M username. Now, I want to become that user just like su - username. It asks me for a password for that user but I didn't set a password for that user. As ...
3
votes
1answer
237 views

Disabling ssh password authentication does not work on my debian VPS

I have a Debian 7 VPS setup. I just enabled SSH Key authentication and disabled password authentication but the disabling did not work. When I attempt to SSH into my VPS, it prompts me for my SSH Key ...
3
votes
5answers
864 views

How to allow authentication with `sudo` using an alternate password?

I have been given a long password by my company for my Ubuntu system. This password is cumbersome to enter when authenticating with sudo repeatedly. Can I authenticate with sudo using a password ...
3
votes
3answers
221 views

Is there way to stop random software packages from remotely transferring your files?

I am running a bitcoin client on my archlinux computer. If somebody can get ahold of the wallet.dat file, located in the ~/.bitcoin/ directory they can steal my coins. I have minimal software ...
3
votes
2answers
557 views

How do you automatically elevate an automatic task to root privileges or is there an alternative approach?

I'm trying to write, in essence, an automatic deployment script for use by our development team and I know I can set up SSH to use keys so that I can automatically authenticate via key instead of ...
3
votes
1answer
215 views

SSH keeps skipping my pubkey and asking for a password

Everytime I ssh onto my remote server I need to provide the password. I copied my public key (id_dsa.pub) to the remote server using: ssh-copy-id -i id_dsa.pub user@server I checked it was ...
3
votes
1answer
524 views

How to stop sudo PAM messages in auth.log for a specific user?

I am using Zabbix for monitoring my environment and zabbix_agentd executes as user zabbix one custom script every 60 seconds; it uses sudo to run this script as root. In /var/log/auth.log I see every ...
3
votes
1answer
6k views

Can't login as root even after resetting the password

We're running a small Centos 5 server in a virtual machine for a class assignment. For reasons unknown, starting about a week ago a number of services started failing. When we tried to investigate we ...
3
votes
1answer
18k views

How to enable remote login?

Currently I can only login to my remote linux via the "ubuntu" user account, without a password (via SSH authentication). I have another user configured on the machine, and if I try to login with its ...
3
votes
2answers
94 views

Why user without any PASSWD entry in sudo config has to authenticate every time?

Consider this sudo config for two users: mary ALL = (ALL) NOPASSWD: /bin/ls, /bin/cat bob ALL = (ALL) PASSWD: /bin/sort Now, when user mary executes any command not in the list she has to ...
3
votes
1answer
3k 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
1k 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 ...
3
votes
1answer
201 views

How are loaded SSH keys referenced by name?

I'm using chef's knife ec2 tool which requires the name of a loaded SSH key (that was created in the Amazon EC2 control panel) It seems strange to me that it uses a name to reference the keypair - ...
3
votes
1answer
78 views

Use ssh without trying ssh-keys

If I try to connect to a certain server with ssh example.com ssh aborts with Too many authentication failures because I have more than 5 ssh keys in my .ssh folder and it loops through all those ...
3
votes
2answers
258 views

Why does my SD card need authentication to access?

I'm running Ubuntu 14.04 on a Toshiba Chromebook 2 via crouton. I recently reformatted a 256GB SD card that I keep in my chromebook at all times. My problem is that every time I try to access my SD ...
3
votes
1answer
1k 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
1k 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
503 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
3answers
7k views

CentOS use .pac file as proxy

I have to use a proxy with authentication to connect to the Internet. But I can't find any solution for this. I have modify my yum.conf, with a lot of possibilities: ...
3
votes
2answers
657 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
4k 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
613 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
12 views

Changing LDAP server preference on Solaris 10

I've recently inherited a new environment running Solaris 10 and I was looking for information on how to change the LDAP server preference on an LDAP client, namely through modifying the ...
3
votes
0answers
26 views

exists a “two-factor authentication” for sudo, if not how to make one anyway?

tl;dr normaly to gain root priviledges via sudo requires a special user account and the use of its passphrase as means to authetication. Due to keylogging/replay (in X.org session) attacks, I would ...
3
votes
1answer
33 views

How to log messages from a pam module?

The problem I am trying to solve is that I want to know if a certain PAM config file is being used or not. The latest version of IBM MQ (V8) provides a PAM file /etc/pam.d/ibmmq. We're ...
3
votes
0answers
159 views

Why is my SSH authentication socket different from the man pages?

These two entries of man ssh-agent describe the SSH authentication socket: $TMPDIR/ssh-XXXXXXXXXX/agent.<ppid> UNIX-domain sockets used to contain the connection to the authentication ...
3
votes
0answers
2k 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, ...
3
votes
1answer
615 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 ...
3
votes
0answers
719 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 ...
3
votes
0answers
3k 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 ...
3
votes
0answers
196 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
447 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
261 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
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
3k views

Why do my sshd logs show many tries on invalid ports?

My ssh daemon is setup to listen on port 2221. I have also disabled root login from ssh. I don't understand why in auth.log I see attempts to log on other ports (example with 4627 here). May 17 ...
2
votes
2answers
897 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
263 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
2answers
6k views

What is difference between pbrun and sudo command?

What is difference between pbrun and sudo command? I have seen people executing pbrun sudo su - what this means? I know su -, it will try to switch to root user. What speciality pbrun gives to sudo ...
2
votes
2answers
87 views

Add a user wthout password but with SSH and public key

I want to add a user to Red Hat Linux that will not use a password for logging in, but instead use a public key for ssh. This would be on the command line.
2
votes
2answers
2k views

How to sign into an open Wireless Network?

I'm running Arch Linux on my netbook. My school have an open Access Point and we must sign into the network via a page which we are redirected to when we try to open whatever website if we are not ...
2
votes
1answer
226 views

SSH Authentication Mechanism

Doing a personal research project and I'm wondering: Why does SSH do its own mechanism negotiation rather than use SASL? At first I thought it might be to ensure confidentiality of the whole session, ...
2
votes
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
2answers
299 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
827 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
501 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
4k 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: ...