4
votes
4answers
147 views

Login into a GNU/Linux distribution is taking too long

So, When I try to login with my username and password (in tty), and insert a wrong password, I need to wait around 5 seconds for the system to tell me that the password is wrong. Why the validating ...
0
votes
1answer
47 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 ...
0
votes
2answers
54 views

Make file in linux readonly

Is there a way to make a file readonly permanently in linux. Or can I put a password to a file to make it readonly, then apply that password again to change its permission, or before they can alter ...
0
votes
1answer
46 views

Change sudo and root password on Debian

I have sudo access, but I don't remember the sudo or root password; how do I change it from my limited account using sudo?
1
vote
3answers
137 views

Why is the 'sudo' password different than the 'su root' password

On my personal machine, I often type sudo in front of certain commands in order to accomplish administrative tasks. I had hoped to avoid doing this throughout the day, by typing su root and providing ...
1
vote
3answers
247 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' ...
3
votes
1answer
887 views

Resetting password in Linux Mint when disk is encrypted

I have a system (VM, actually) with Linux Mint 15 on it. The disk is encrypted, but I remember that password -- just not the password for my account. I've tried changing the command in GRUB from ro ...
5
votes
3answers
120 views

How to log into database via script securely?

I am wondering about whether it is acceptable (security-wise) to have database login credentials (user/pass) set in an environment variable or passed in as a command-line parameter? Both of these ...
5
votes
1answer
2k views

Manually generate password for /etc/shadow [duplicate]

I need to manually edit /etc/shadow to change the root password inside of a virtual machine image. Is there a command-line tool that takes a password and generates an /etc/shadow compatiable password ...
2
votes
1answer
178 views

How to change the forgotten root password?

I am very new to Debian linux, I forgot my root password...actually I think I know what it is because it is the same password I have for pretty much everything but in the Terminal in tell me "Sorry, ...
2
votes
2answers
157 views

Equivalent of “passwd -sa” in RHEL?

I feel a little silly having to ask this, but: In Solaris you can issue a passwd -sa command which gives you (more or less) the same output as passwd -S userName does, except it prints out the status ...
1
vote
1answer
240 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 ...
2
votes
2answers
2k views

Ubuntu password policy

I want to set the system-wide password policy on an Ubuntu 12.04 LTS server. Googling around, a lot of people point to this (very old) document: ...
1
vote
1answer
130 views

How do I keep KDE from asking new users for a password when I use /etc/skel to set up their enviroment?

I made this nice custom KDE setup on Arch Linux with customised settings like desktop background, panel settings, kwin settings, etc. I heard that if you copy all the hidden files from your ...
3
votes
2answers
7k views

How do I set the password of a new user after the account has already been created?

I used the 'useradd' command to create a new account, but I did so without specifying the password. Now, when the user tries to log in, it asks him for a password. If I didn't set it up initially, ...
6
votes
4answers
1k views

Is it possible to change password database file(/etc/passwd) in linux?

Is it possible to change password database file(/etc/passwd) to some other file. How does this authentication mechanism work internally ? Does it depend on pam ?
6
votes
1answer
149 views

Why do we need an expiration period?

Why is there a gap between the expiration of an account and its complete deactivation, when one can no longer log in or change his password when it became expired?
6
votes
3answers
4k views

Getting the password expire time

Let me preface this with: I do NOT have root access available. I recently got locked out of my account because I did not know the password expiration was getting close, then elapsed. I want to add a ...
2
votes
1answer
2k views

How to set a new password from bash?

I'm using busybox with a limited passwd (I don't have --stdin option) and without chpasswd and I need to change the password of an user from bash. Here is my best result: echo newpassword > ...
3
votes
2answers
1k views

Second field in /etc/shadow

If the second field of the /etc/shadow file is set to !!, does it mean that the account is disabled? Or does it mean that the account is active with no password assigned?
10
votes
4answers
14k views

How to check password with Linux?

I want to check, from the linux command line, if a given cleartext password is the same of a crypted password on a /etc/shadow (I need this to authenticate web users. I'm running an embedded linux.) ...
2
votes
4answers
568 views

sudo without password - security? [duplicate]

Possible Duplicate: What specific vulnerabilities am I creating by disabling the sudo password? I'm involved yet again in the old argument on whether sudo without password is secure enough ...
9
votes
2answers
986 views

How do I log into my Linux laptop if I have forgotten both the login and password?

How do I log into my Linux laptop if I have forgotten both the username and password?
5
votes
1answer
300 views

Linux Root Recovery

On Ubuntu 10.10 I can login as root without the root password by replacing ro quiet splash with rw init=/bin/bash. How can I secure my machine and disable this backdoor?
2
votes
1answer
589 views

root password changed automatically

I have my system on dual boot (win7 and RHEL 6). I have 2 user account on RHEL 6. A normal user and a root user. I put passwords of both accounts same. It was working fine from 5 6 days. Yesterday I ...
7
votes
3answers
2k views

Why does my sudo ask for password only once but evaluate thrice?

$ sudo some_command Password: Sorry, try again. Sorry, try again. Sorry, try again. sudo: 3 incorrect password attempts $ This is what my shell prints when I enter a wrong password to a sudoed ...
7
votes
5answers
14k views

Program for decrypt linux shadow file

Is there any program or script available for decrypt Linux shadow file ?
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?
4
votes
3answers
223 views

Randomise or shred memory of an application

Is it possible to randomise or shred memory of a particular application just after its life ends, or better, whenever it deallocates some memory? A command-line utility like this would be perfect: ...