Questions regarding password-based authentication and password management

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2
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0answers
27 views

NetworkManager cannot remember my WiFi password

My system is Gentoo 64bit, with KDE4. I just updated my Gentoo system. And after reboot, it asks me for my WiFi password. But the next I log in, it asks the password again. I checked the settings, and ...
2
votes
1answer
2k views

Ubuntu 14.04 login into desktop by single user mode

My OS is Ubuntu 14.04 64-bit, and kernel is 3.13.0-30-generic. I forget my user account password and now want to get into GUI desktop. I know from the Internet that we can reset password by single ...
2
votes
0answers
120 views

Why sudo won't remember my password?

I use sudo in many systems, but I have one of them that makes me type my password each time I run sudo. All the others remember it for a while. This is debian 7.4 wheezy and sudo 1.8.5 I found this : ...
2
votes
0answers
40 views

Getting non-stored password from Icedove

I've recently changed my mail password (because of Heartbleed), but I've forgotten the new one. When entering the new password in Icedove, I didn't think of clicking "remember password", but the ...
2
votes
1answer
2k views

Deleting a samba user: pbdedit vs. smbpasswd, what's the difference?

What is the difference between $ pdbedit -x and $ smbpasswd -x to delete samba users?
2
votes
0answers
730 views

Changing Samba/LDAP password with passwd

We've installed CentOS Directory Server (389 DS) and have Samba using it as a backend. This works great except that when enabling password syncing in the smb.conf it is only synced one way. I could ...
2
votes
1answer
117 views

How to run john parallel on several CPU's?

If I use: john --incremental UNSHADOWEDFILE then I can see it uses only 1 CPU. How can I set john to use several CPU's for finding the weak passwords? (need to find weak ones faster because of an ...
2
votes
0answers
416 views

Validate Password for user account from shell script

Application is for a multiple server standardization script Looking for a way in a shell script to check if the password for an OS account (AIX) matches a standardized plain text password. The ...
2
votes
0answers
462 views

Getting a short wifi password to work on Linux Mint

Wifi password became a problem to me. My wifi password consists of only 4 letters but my Linux Mint 12 is expecting more than 7 letters - until then connect button is disabled. Can I work around this ...
2
votes
3answers
710 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: ...
2
votes
3answers
1k views

newgrp asks for password [duplicate]

I don't understand why newgrp prompts me for password when I want to change my group. I don't even know what password it is asking for but certainly not mine (user clime). $ id uid=500(clime) ...
1
vote
6answers
660 views

Program a file to self-destruct at a given time

Does anyone know whether there is a command in linux that can set attributes to file so that the file can disappear after certain time. For example, if I set one attribute to file as "1/1/2015", so ...
1
vote
2answers
184 views

Why can I access all my files without a password when booting with a Chakra Linux live CD?

The other day I burned a Chakra Linux iso on a dvd. When I booted into a live session I was able to access all my regular data. In dolphin when clicking on the icon belonging to my /home/user ...
1
vote
1answer
1k views

How to reset Linux root and grub passwords?

If we forget our Linux root password, we can change it by changing grub's boot options. But in this case, we also set a grub password and forgot both passwords. How can we recover both?
1
vote
1answer
622 views

crypt() on different machines

Because of a hardware issue i need to migrate many virtual users to a new machine. Their passwords stored in MySQL encrypted with ENCRYPT which using crypt()eventually. Maybe it's my fault but salt ...
1
vote
5answers
14k views

How to Reset Forgotten Root Password in Fedora 19 from GRUB

YES, FEDORA 19. I saw a lot of information about how to do it but doesn't work with this version. All the tutorials explain the method for older versions of Fedora, i didn't found anything about ...
1
vote
3answers
1k views

Ask root for password when using su command

I'm trying to edit /etc/sudoers via visudo, but I don't know how to change the root rights. I want root to be prompted for the user1's password, when he tries to use su user1.
1
vote
2answers
42 views

Disallow Changing of Passwords [duplicate]

I have a spare computer running as a small server doing various things, and I'd like to create another account for my cousin, so she can learn how do manage a server/run minecraft etc. I'd like to ...
1
vote
5answers
618 views

Is there some default password for a new user in Linux

I am a Windows user gradually moving towards Linux. In windows we have an option of either having or not having some password for an user.Once we do not put a password we can directly log in to the ...
1
vote
1answer
74 views

What is “Charlie &” in the gecos field on OpenBSD for root?

Question: what is "Charlie &" for the root user? I didn't gave "Charlie &" for gecos field, I think I didn't gave any at all. ps.: the "/sbin/nologin" doesn't matters, I just tested ...
1
vote
3answers
520 views

How to gain root privileges for specific user if we have root password? [closed]

Can someone suggest how can I change process privileges in Linux to root ? Assume, I have a normal process running under some user-consider me. Now my script should create some users using 'useradd' ...
1
vote
1answer
69 views

How does Linux verify the login password?

I would like to know how the password verification in Linux works. I know that the passwords are stored as a hash in /etc/shadow file and user information is in /etc/passwd file. My understanding ...
1
vote
1answer
86 views

What triggers this screen prompt “Screen used by <username> on host01.”?

Every now and then some key combination clears my working (Gnu) screen and brings up this message: Screen used by <username> on host01 Password: What key combination causes this and what does ...
1
vote
1answer
40 views

Dynamic password authentication

I would like to know how can I (and if it's possible) create a dynamic authentication for a user in linux. The server would change the user password periodically and the user would use a program ...
1
vote
3answers
363 views

How to unlock admin account

By mistake I locked my admin account on Debian with passwd -l. I'm trying with live CD to unlock my account with no sucess. I've tried editing passwd file by removing x, but that didn't work. ...
1
vote
1answer
2k views

can't ssh into remote host with root, password incorrect

I have a remote host, previously I can ssh into it with root and password ssh root@remote_host or I ssh into it first using a regular user account ssh esolve@remote_host and then su root and ...
1
vote
2answers
2k views

I reset my password and now I can login, but without nautilus or program menu

I recently powered on some old notebook with Linux Mint 11 (Katya) installed, and I thought I remembered my user password, but turns out I didn't. So I reset that password using the instructions here. ...
1
vote
1answer
40 views

SSH key-only remote login, is disabling password a good practice?

I need a maintenance user which only requires a remote login. I'll preferably use only public keys to login into the account. I thought of just creating the user with useradd myuser, adding later the ...
1
vote
1answer
36 views

How do I remove login password for Centos6.5?

Question 1 On Centos 6.5, I have a username called admin. How can I make it so the system logs in automatically? Question 2 How can I configure system to login as root user when there are other ...
1
vote
1answer
56 views

How to check my account on embedded linux without “/etc/passwd”?

On some embedded linux systems, there is no /etc/passwd file and /etc directory is not writable (which means I cannot set user account and password?). Then what is my (default) account name and ...
1
vote
2answers
68 views

Why does it take more time for a login to fail than to succeed? [duplicate]

When logging in to my PC, and the password is correct, the login takes place nearly instantaneously. When the password is wrong, it takes a few seconds of waiting until the hint "The password is not ...
1
vote
1answer
1k views

Debian Live-CD user password

I am trying to use Debian live from an USB, however I do not succeed in logging in… What is the standard user and password to get access? I have tried searching this question on the internet and ...
1
vote
1answer
56 views

Is it possible to remove the delay on wrong password? [duplicate]

So I type my password incorrectly from time to time. Sometimes for sudo sometimes for logging in to my (Ubuntu) machine. In either case, there is a two or three second delay before it gives me a ...
1
vote
2answers
367 views

gvfs-mount auto password

I would like to make shortcuts for gvfs mounts (I prefer to mount from the shell). For this, it is quite necessary/convenient not to have to enter the password for the ftp:// and sftp:// connections . ...
1
vote
1answer
89 views

Adding pass completion to fish shell

I'm trying to get the CLI password manager pass to work in my fish shell with auto completion. I've already found the necessary file on GitHub, yet am having trouble finding out where to put it, or ...
1
vote
1answer
505 views

Reverse id command, I want the User/Group Name from the uid or gid

I know some uid and gids that I dont know who they belong to and they are not in /etc/passwd (could be LDAP or from another system). How do I get Id info from only uid or gid preferably without using ...
1
vote
3answers
671 views

Change a Password is not successfull on ubuntu 12.04

i am trying to set a new password for linux Ubuntu 12.04,but on running command its giving something like this $passwd Changing password for ubuntu. (current) UNIX password: Enter new UNIX password: ...
1
vote
1answer
1k views

luksOpen: No key available with this passphrase

I've created a encrypted volume with LUKS at home and was looking to use it at work too. Unfortunately, that's not possible. Whyever, I'm unable to access the encrypted data on any other computer than ...
1
vote
1answer
377 views

How to safely put user typed password into a file?

Is there any way to put the password typed by user into a file (either in Unix or in expect). read -s -p "enter password" input echo $input > file Is the above code safe? I want to use that ...
1
vote
2answers
646 views

Is it possible for sudo to read password from gnome-keyring or similar

I'm currently using sudo a lot in a bunch of scripts, which is turning into a bit of a hassle, as some scripts does not allow interactive input (e.g., Makefiles). Instead of disabling sudo passwords ...
1
vote
2answers
857 views

Max password size in AIX 6.1

I found on the AIX documentation some rules to set about passwords length : minlen Defines the minimum length of a password. The value is a decimal integer string. The default is a value of 0, ...
1
vote
1answer
1k views

SCP and/or SSH command with password in line

First, I'm TRYING to use rsa keys because I'm using the script to create RSA keys, but initially I have to connect to the remote machine to pass over the newly generated authentication key. Having ...
1
vote
1answer
49 views

How to force change linux password even if similar as previous

I am trying to change my current password in Red Hat Enterprise Linux Server release 5.10 (Tikanga) but it says my new password is too similar. Is there any way to force change ? $ passwd Changing ...
1
vote
1answer
146 views

Linux can't recognize the right password when ssh'ing?

I've created a local port forwarding and I was trying to ssh into my own port. During the process, I found that my own Linux won't recognize me even when I have the right password ...
1
vote
2answers
106 views

can you only input the password once and then execute the su command without entering a password? [duplicate]

I am copying files from a remote server to my local server. Here is the code that does this: sshpass -p "password" ssh -q username@$192.168.162.156 "mkdir -p /temp ; ...
1
vote
2answers
80 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 ...
1
vote
1answer
251 views

Resetting password expiry date by number of days instead of specifying date

Is there a way with either commands passwd or chage to force the password to expire 90 days from the time of command execution? I know I can do it by date, such as: chage -E "2014-07-31" userid ...
1
vote
1answer
502 views

How do I change login shell to nologin for an LDAP user RHEL 6?

yum install ypchsh and yum install ldapmodify both don't find a package. I only want to change the shell for certain ldap users on this one server. Someone please help, I can't seem to figure this ...
1
vote
2answers
813 views

Edit home directory for an LDAP user in Linux

I have an LDAP user who accesses a server based on having the appropriate LDAP host attribute via sssd. This user does not show up in /etc/passwd because he is not local. How do I modify his home ...
1
vote
1answer
254 views

Can't sudo after lock password, can I recover from that?

After setup ubuntu with default settings, It allows user to login with password, so I use passwd -l [username] to forbid password login both in ssh and console. But when I use sudo to execute ...