Questions regarding password-based authentication and password management

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0
votes
4answers
865 views

How to make the script automated to take password on its own?

I have a script that is doing sftp some files from one server to another, like inside the script script.ksh I have the below lines; sftp user@ip_address << EOF cd path put file1 bye EOF When ...
0
votes
0answers
34 views

SCP demanding password for root

I configured (successfully I hope) a client and a server on OpenWRT (SSH), now I'm trying to use scp to put a file on a server from the client, but it doesn't work because it wants me to give a ...
1
vote
2answers
150 views

Script samba password but securely

I want to script the addition on a samba user and the password. I have seen solutions similar to the one here Piping password to smbpasswd echo -ne "$PASS\n$PASS\n" | smbpasswd -a -s $LOGIN but ...
21
votes
11answers
7k views

How to create strong passwords in Linux?

I wonder how I can create strong passwords on Linux (for both normal and admin users) and if there are specific programs to do that.
2
votes
2answers
899 views

Warn about password expiration without forcing change

It's pretty simple. I would like to figure out what combination of changes in /etc/login.defs and/or /etc/pam.d/system-auth-ac. I would need to perform to allow the following behavior: I want a ...
6
votes
3answers
12k views

Two ways to lock a password but only one to unlock

CentOS 6 Linux has two ways to lock a password: passwd -l usermod -L Today I found out, that they do something different. passwd writes two exclamation marks into the shadow file. # passwd -d ...
47
votes
5answers
73k views

Manually generate password for /etc/shadow

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 compatible password ...
0
votes
1answer
32 views

Cleanest way to require the user to enter password to run a program?

What is the cleanest way to require the user to enter password in order to run a particular program without the use of third-party applications? For example, if I type firefox to launch it from the ...
5
votes
0answers
96 views

Taking a picture with a laptop webcam after entering an incorrect password

I'd like to set up my laptop so that if a wrong password is entered when the screen is locked, a picture is taken using the laptop's webcam. I examined xlock (from xlockmore package), but there is no ...
5
votes
3answers
6k views

chroot permission denied! But I'm root!

I am trying to chroot into an old HD to change a forgotten password, but chroot says permission denied? what gives? I am root! The harddrive I am trying to chroot into is an old version of edUbuntu 7....
2
votes
2answers
2k views

How do I edit the hotspot configuration for Network Manager?

Running Arch/Linux with everything up-to-date and I use network manager's built-in hotspot function to share my Internet. I'm trying to edit the configuration (mostly the password, as I don't like ...
-2
votes
1answer
55 views

Bash script if - else contitions [closed]

I would like to do create a bash script that downloads a specific installer from the internet, installs it, create a desktop file that launches it, make it auto start, then remove the installer, but ...
3
votes
0answers
48 views

Cannot login SSH with key, always asking password

There is a issue confusing me for couple of days. I have 3 Servers. A, B and C. I want access B and C from A via ssh. I have set public key/ authorized_keys ... on A,B,C. Scenario #1: Access B(.133)...
1
vote
2answers
12k views

vsftp user authentication problems

I configured my ftp user's home dir to /var/www and set a password but I cannot login with ftp 127.0.0.1, it keep giving me 530 Login incorrect. Why is this? I'm sure I have typed the password right. ...
0
votes
1answer
63 views

ssh/git does not use GUI to ask for password after upgrade to to Ubuntu 16.04

I used to run Ubuntu 14.04 on my computer. Whenever I used ssh keys to log in to various servers, I used to get a GUI pop-up dialog asking me for the password for my key. After entering the password ...
1
vote
1answer
45 views

script ssh login to server and pass root password

I have written an expect script to automate the login process for ssh. My user account has rsa keys setup but once I log in I want to switch to root but the remote server is hanging on the password. I ...
5
votes
4answers
2k views

Stracing su and ssh shows the password. Is this a security flaw or am I missing something?

I'm currently fascinated by strace so, being new to it, I decided to play around a little. As suggested by the question title, I tried both strace su and strace ssh. Both commands displayed the ...
5
votes
2answers
2k views

Scripting htdigest -c /path/to/file/$user $user $password in Bash

I want to be able to script with a password in variable $password. htdigest -c /etc/apache2/pw/$user $user $password At the moment it asks me to manually enter a password; this is not going to be ...
0
votes
0answers
11 views

Generating word list base on possible numbers/caracters via Crunch in Kali Linux

I'm new to crunch. I'm try to generate word list containing 8 characters long. I've tried crunch 8 8 > pw.txt It freeze my computer because it doesn't have enough space for that. Is there a ...
2
votes
1answer
14 views

How to “forget” user credentials after logging in to a windows share (samba)

I logged in from my Mint to a windows share (which is actually a linux running samba, if it's relevant), typed in the password, and got it. Even though I marked it to forget the password immidiatly, ...
4
votes
2answers
5k views

Unable to pass the password to su in a script

I am writing a build script. This script has to copy a file in the end. This file will be placed in another users home directory and it is also necessary that the file belongs to this second user. My ...
1
vote
0answers
33 views

How to read the password of a user and implement it in the subsequent commands?

I am writing an api call that requires the user id and password of the user. I can get the user id but how to get his password and supply it to a variable? Here is the api command curl -u $user:$...
3
votes
1answer
28 views

Can I unlock 'pass'?

In my search for a simplistic password manager, I found 'pass' and made it my choice. One unexpected difficulty, that I encountered, is that web searches about its features are difficult to phrase in ...
0
votes
1answer
795 views

Linux Mint MATE: Disable encrypted volume password dialog

I'm running the MATE edition of Linux Mint on my laptop. I have an external USB disk with a LUKS container on it. The USB disk is connected to the laptop's docking station. Whenever I connect the ...
2
votes
2answers
151 views

How can I run ssh-add on demand? Can it act as SSH_ASKPASS?

I want to ssh from user@local to user@remote several times per day with an encrypted SSH key, a situation which ssh-agent handles with a good trade-off between security and usability. I'd also like ...
3
votes
1answer
3k 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 ...
0
votes
0answers
14 views

In Ubuntu Chromium does not load any saved passwords in Normal Mode but working fine in Incognito Mode

I have a weird problem. I recently did a software update for Chromium and now it does not load any off my saved passwords (I literally had hundred for all my clients.) When I go to manage saved ...
3
votes
3answers
18k views

How to Use Encrypted password in shell script AIX

I had written a shell script that will connect with the Database to perform some operations This is my sample code #!/usr/bin/ksh . /home/ram/.profile sqlplus username/pwd@TNS<<EOF select ...
6
votes
3answers
3k views

Logged on via ssh-key, can I reset my account password?

I am logged in on a server via sshkey (ssh -i /home/me/.ssh/ssh-key me@server). I got sudo rights on that server from the admin, but I can't exercise them, since I forgot my actual Unix password (or ...
3
votes
1answer
40 views

groupadd -p Not Recommended?

I have a question about groupadd, specifically with password (-p). It says it is not recommended, "This option is not recommended because the password (or encrypted password) will be visible by users ...
0
votes
1answer
49 views

Ubuntu & Plesk - How to exclude a sub-url from password protection?

I have website which is password protected where runs a php app on it. Now I have to unprotect a sub-url of that website but without disablng the protection of the main site which is configured ...
-1
votes
2answers
75 views

Creating a user without a password on NetBSD

On my NetBSD installation, I have it set so that root has no password. I can login as root without typing a password. But, when I create a user with just useradd -m <username>, log out, then ...
0
votes
0answers
18 views

Where are WiFi passwords stored in Linux Mint? [duplicate]

Where are WiFi passwords stored in Linux Mint? I have tried this looked into /etc/NetworkManager/nm-system-settings.conf, but could not find it.
4
votes
7answers
6k views

Hiding Password in Shell Scripts

How can I hide a password in shell scripts? There are a number of scripts that are accessing database. If we open the script others also aware the username and password. So if anyone knows how to hide ...
0
votes
1answer
32 views

How to delete password for current account

I just installed Ubuntu 15.10 on my new desktop. However, I want to erase the password of it. I followed the instructions here. I now can successfully login with out password, but I cannot use sudo ...
25
votes
3answers
99k views

How do you change the root password on Debian?

I want to change the password I assigned to root on my Debian webserver to something longer and more secure. Bit of an obvious newbie question, but how do I do that? I haven’t forgotten/lost the ...
2
votes
1answer
25 views

Can I make it so that all new users created in the future will have an expired password by default? [duplicate]

I want to make it so that every time anyone creates a new user on my system that user will be forced to set a password during their first login. I can't find anything in /etc/login.defs that will do ...
2
votes
2answers
14k 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 ...
3
votes
3answers
52 views

Sudo-like remembrance of passwords for own scripts

I have a script which requires a password for authenticating a web service. A single password for a pre-defined user will suffice, and the password should if possible be stored securely (not plain ...
68
votes
2answers
8k views

I accidentally typed my password into the login field, is it still secure?

I was looking down at my keyboard and typed my password in because I thought I had already typed my login name. I pressed Enter, then when it asked for the password I pressed Ctrl+c. Should I take ...
2
votes
2answers
73 views

Hiding passwords in wpa_supplicant.conf with WPA-EAP and MSCHAP-v2

My wpa_supplicant.conf looks like this: network={ ssid="Some name" scan_ssid=1 key_mgmt=WPA-EAP eap=PEAP identity="my-user-id" password="(clear text password here)" ca_cert="/usr/share/...
3
votes
2answers
41 views

Feedback when entering passwords, without revealing length

I often SSH into a machine and use sudo on it. When entering passwords, I'm always afraid that another window will steal the focus. However, I don't want to display asterisks (with pwfeedback, for ...
0
votes
1answer
17 views

KSH password generator

How to make sure the generated passwords contains all these special characters: ?!/=\? Currently I'm using: pwd_usr["$i"]=`cat /dev/urandom|tr -dc "a-zA-Z0-9-_\?\!\=\/\"|fold -w 15|head -n 1` But ...
14
votes
3answers
20k views

Allow user1 to “su - user2” without password

I need to allow user martin to switch to user martin-test without password su - martin-test I think this can be configured in /etc/pam.d/su. There are already some lines in that file which can be ...
0
votes
1answer
47 views

rsync over ssh without typing the password each time [duplicate]

I got a bash script to synchronize data between two computers. It works fine but I have to type my password every time the rsync command is called. #!/bin/bash sourceIP="192.168.178.128" sourceUser=...
0
votes
1answer
36 views

How can I avoid being prompted for a password in this script? [duplicate]

I’m using Amazon Linux. If I login as my “otheruser” user, and create a script, test.sh, with this text sleep 5 ; sudo reboot now I can login and run the script like so … [davea@mydevbox ~]$ sudo ...
0
votes
1answer
34 views

What's the difference between lpasswd and passwd commands?

Studying the CentOS/RHEL sysadmin manual, I can't understand if there are or what are the differences between these commands.
6
votes
2answers
9k views

export HTTP_PROXY and special characters in passwd

Suppose for the sake of argument my password below is abc123@ I need to authenticate my linux machine through a corporate proxy to get patches and updates... normally I'd use this: export HTTP_PROXY=...
0
votes
0answers
61 views

Centos 7 root passwd reset

I was stupid enough to log my root password on one spot and that crashed so I lost my root password to my server. I followed the guild of https://access.redhat.com/documentation/en-US/...
20
votes
8answers
23k views

How do you create a user with no password?

In os X it's possible to have users without passwords. If you inspect them with dscl their password show up as *. This is used for system users such as users for databases like mysql, pgsql etc. What'...