Questions regarding password-based authentication and password management

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23
votes
2answers
35k 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 compatiable password ...
2
votes
5answers
474 views

How to add a password to a BASH script

I want to create a script to run the following BASH command: mysqldump -u [username] -p [db_name] > [path to backup file] Which results in a backup file. When running this in BASH, it prompts ...
1
vote
2answers
26 views

User verification

Suppose I've writen a setuid root executable and I want it to verify that the user is not a script by asking the user to provide his/her password (granted, users might save their password and use that ...
2
votes
1answer
22 views

Same salt/hash value in /etc/shadow

Looking in /etc/shadow, I can see several users that have the exact same salt and hash value (and thus password). How could the system end up like this? Does this mean the password was not ...
2
votes
2answers
42 views

How to know when my password will expire? [duplicate]

How can I get to know when my password will expire? I'm running IBM AIX.
1
vote
5answers
7k 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 a user. Once we do not put a password we can directly log in to the ...
3
votes
2answers
59 views

Trying to crack a weak password using John

I have a computer from the 1990s. It has an (extent) EFS file-system which cannot be wrote to in linux, so i cannot reset the password manually. So i have to crack my password. For this I am trying to ...
10
votes
4answers
2k views

what does star in passwd file mean?

I have a computer that I need to boot into, but the passwords seem to be bogus. Additionally i cant mount the drive for writing, and it is a mips processor, so I cant stick it in another machine to ...
0
votes
1answer
29 views

Scanning user directories for specified file [on hold]

i want to find all files in /etc/passwd called cat.sh and then outputs the timestamp and * of entries. I was thinking of using grep -l "cat.sh" * | wc -l
1
vote
0answers
20 views

Can I make cross-computer sharing compatible with tinfoil-hat security (password managers, email, etc.)

Preface: I realize the following is asking for tinfoil-hat type security, but I'm really curious for answers to my questions -- not suggestions to enable two-factor logons on gmail, etc. and call it a ...
1
vote
1answer
39 views

How to retrieve a password from KWallet; KWalletManager won't run

Trying to retrieve a password from KWallet, I found that I couldn't open KWalletManager. Neither the menu item System > KWalletManager, nor Alt+F2 and typing in kwalletmanager do anything. Does ...
8
votes
5answers
15k views

How to get back sudo on Ubuntu?

I have done this: sudo chown -R myname /usr/ and now I can't use the sudo command because of this error: sudo: must be setuid root And as I read this means that the owner of this file ...
2
votes
2answers
731 views

securely automating a script which requires a key to do its task

I have a script that downloads bank transactions to store in a database. To get these transactions requires a password for each account. The database is encrypted and requires a key to access it. All ...
0
votes
1answer
57 views

sftp to use password stored in a parameter file

Is it possible to to connect two server through sftp with a batch of commands and where the authenticating password needs to be read from a file(where it is stored previously).I am new in UNIX world , ...
0
votes
1answer
21 views

Set root password AMI linux

I need set a password for root on EC2 AMI linux. I have tried with passwd root but if I enter with ec2-user and run sudo su, I get a root bash without asking for a password.
1
vote
2answers
34 views

Where & How is user group information stored in Ubuntu? [closed]

Two places possible: /etc/group and /etc/passwd. If I use command: adduser [username] [groupname], then the user would be added to the group, and the file /etc/group would then be updated. However, ...
1
vote
2answers
78 views

How do I scp a file from server A to server B from cron?

I have a file in server A which I am able to do transfer to server B using scp. I need to do this through a cron entry. server B has a password. How do I perform this?
0
votes
2answers
92 views

Dynamic change of Linux root password everyday

I want to change my root password everyday based on the date. The password will be like a combination of a string and the date. The below code is working fine. echo -e "pass"$(date ...
0
votes
2answers
6k 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. ...
11
votes
2answers
704 views

How do I make sudo remember my password for longer?

How do I make sudo remember my password for longer so that I don't have to keep typing it? I do not want to sudo su and execute commands as root all the time. I am on Arch Linux and have tried to ...
1
vote
2answers
64 views

2 passwords for login

On Linux, I would like to to set up a user account in such a way that the user would have to enter 2 passwords to log in. Is this possible, and what would be the implications of this?
1
vote
1answer
2k views

How can I manually decrypt the hard drive?

I've just switched to Ubuntu 12.04 one year ago and moved all my photos, documents, etc to the 1TB main hard drive that has been encrypted during the installation process - not LVM but only the home ...
3
votes
1answer
34 views

security model of Linux password entry

Whenever a Windows application wants to do something requiring administrator privileges, my screen goes black and a prompt comes up, asking if I want to grant administrator privileges. I understand ...
0
votes
1answer
59 views

Wordlist/dictionary generation for penetration testing

How can I generate a dictionary of words containing 8-16 of alphabet characters ([a-zA-Z]) with low memory?
1
vote
1answer
3k 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 ...
0
votes
0answers
27 views

not modified file increased size

weird thing happened. passwd file size increased although the timestamp hasn't... i've checked for rootkits and nothing found. Any reasons you can think of? Regards
1
vote
2answers
186 views

How strong is the encryption of a zip file in Linux Mint

Zip encryption has had often a bad reputation of being weak, but some would argue that a zip file encrypted using certain algorithms (such as by using AES), together with strong password, is really ...
-2
votes
1answer
61 views

SSH into a Remote Machine with a Password

I'm to trying to dd a remote disk using SSH with the following command: ssh userfoo@111.111.111 "dd if=/dev/xvda1 | gzip -1 -" | dd of=/home/user/image.gz I get the following error: ssh: ...
-1
votes
0answers
12 views

How to change the password of Gmail in CLI? [migrated]

How to change the password of Gmail in CLI ? That is, after: openssl s_client -crlf -connect pop.gmail.com:995 What command should I type? Some says we can't in CLI. Is it true ? And Is it also ...
3
votes
1answer
2k views

Why does pam_mount ask for password?

I used the pam-auth-update tool in order to enable some pam configuration profiles: PAM configuration PAM profiles to enable: [*] encfs encrypted home directories [*] Unix ...
52
votes
3answers
13k views

Why is there a big delay after entering a wrong password?

I notice a weird (well, according to me) thing about passwords. For example, if I type an incorrect password during login, there will be a few seconds' delay before the system tells me so. When I try ...
2
votes
2answers
2k 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
7answers
21k 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 ...
3
votes
1answer
98 views

OS X FileVault 2 duress password

I've been attempting to add a custom script to run after the FileVault password is entered on login that will check whether it a 'special password' that will run a script in the background after ...
1
vote
6answers
256 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
27 views

Change requirements for passwords on Oracle Solaris 11.2

Is it possible to change strict requirements for user passwords, including root, e.g. I'd like not include numbers in the password as required, since this is a home machine, and I'm the only user?
5
votes
3answers
503 views

Does the shadow file have encrypted passwords?

man 5 shadow says this about the 2nd field: encrypted password Is that true nowadays? I think it should say "hashed password". Am I correct?
4
votes
3answers
13k views

Lost password for a user on a Linux Server: How reset it?

On a Server an user 16040 has lost his password. I have password for root but don't have password for user 16040. How can I reset his password? With passwd 16040, unix ask me current password that I ...
16
votes
2answers
2k views

SSH ignores characters after correct password string?

Remote machine 10.10.10.1 has password "asdFGH12" for user named "user". I'm able to log in even if I type in password "asdFGH12dasdkjlkjasdus" or any other characters after the "asdFGH12" string. $ ...
1
vote
1answer
26 views

Disabling su - <user1> alone

In my Team , we have a server which few people know the root password I can see they log into root and then use su - user1 to use from user1 login., I cannot change root password for some reasons , ...
2
votes
0answers
38 views

Is there a password manager server application

Yet another hackers attack on the infrastructure of companies that offer to store our passwords begs the question: Is there a password manager server application? (Along with browser extensions) ...
3
votes
2answers
45 views

How to generate a CSR for attaching SSL certificate to the site? [duplicate]

How can I generate a CSR for attaching SSL certificate to the site? In various articles about installing SSL certificates are described different ways of generating private key and CSR. That's like ...
0
votes
1answer
47 views

Manipulating a (non-root) password in Fedora 22

My Fedora 22 (workstation-gnome) home pc has two accounts: steve, which has no password, and root which does have a password. On this website, the fedora 22 - change from gnome to kde4 topic may ...
2
votes
2answers
57 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
3answers
2k views

/etc/shadow : how to generate $6$ 's encrypted password?

In /etc/shadow file there are encrypted password. Encrypted password is no longer crypt(3) or md5 "type 1" format. (according to this previous answer) Now I have a ...
2
votes
1answer
80 views

How to safely transmit a password over SSH for a remote command to use

On the local server, I have a program that stores the password in the predefined environment variable (SPECIAL_PASSWORD). On the remote server I have a program that reads and uses a password from a ...
0
votes
2answers
36 views

Installing Kali Linux

This is my 4th attempt at installing Kali Linux mini on Dell Inspiron 1545 Laptop. When I get to dialog that says "Select components to install" there is no way to select additional components it ...
0
votes
1answer
39 views

How to change password of an ssh identity file

Can I, and in that case how can I, change the password of an SSH identity file without having to generate a new key and setting up it all over again?
8
votes
3answers
42k views

Shell Script for logging into a ssh server

I tried writing a shell script which can do automatic login into a ssh server using password which is mentioned in the script. I have written the following code: set timeout 30 /usr/bin/ssh -p 8484 ...
0
votes
1answer
23 views

How to see the password in rhel6 [duplicate]

How to see the password what we are entering in RHEL6. If not how to see at least the entering password in some special characters.