Virtualmin is built on top of Webmin, and utilizes all Webmin modules as the base, including user accounts, and the login authentication page. Thus, if you need to change or reset the password for Virtualmin, it’s actually to change or reset the password for Webmin, and vice versa.
By default, the Webmin user access rights is set to Unix authentication. In other words, when you login to Webmin, Webmin will authenticate the user name and password against credentials of same user name in Unix/Linux account. Thus, Webmin user shares the same password with Unix/Linux user account, and always in sync.
Webmin also allows users to create their own user names and set their own passwords which are different from system account. Thus, if you forgotten your password to root account, or unable to login to Webmin with master root user, there are several scenarios that you can change or reset the root password, as detailed below. The first method to change root password, assuming you’re using Unix authentication, if by changing root account password in the system. Login to the system via SSH or console as root, and type the following command: passwd Enter the new password for the root. The new password will be used by Webmin for authentication automatically.
Alternatively, login to Webmin or Virtualmin, then go to Webmin - System - Change Passwords, and then click on root to change the password. If you’re not using Unix authentication, go to Webmin - Webmin - Webmin Users, and click on root. Make sure the password field is changed to Set to, then enter the new password for root. To verify that you’re using synced Unix authentication with Webmin, login to Webmin or Virtualmin, then go to Webmin - Webmin - Webmin Users. Click on the user account which you want to check. If the password value is Unix authentication, it means that the account is authenticated through Linux/Unix account.
If you’ve forgotten the Webmin master root password on Webmin authentication, but still you still have access to the system shell via physical console or SSH, you can change the Webmin root password with a program called changepass.pl. Assuming you have installed Webmin in /usr/libexec/webmin, you could change the password of the root user to password by running: /usr/libexec/webmin/changepass.pl /etc/webmin root password Once set, Webmin will switch the root user account to Webmin authentication instead of using system root account credentials. Last but not least, if for some reason Webmin simply refuses to grant access to root master user which set to Unix authentication, even though you can login to the shell with the same password, it probably indicates that the Webmin / Virtualmin installation may be corrupted. In this case, the solution would be to reset the installation of Webmin / Virtualmin, by uninstalling and reinstalling.
Run the following command (install.sh is the Virtualmin / Webmin installation script):./install.sh -uninstall Then, completely uninstall Webmin / Virtualmin package: In Ubuntu / Debian: apt-get remove webmin In CentOS / RedHat: yum remove virtualmin-release. FATAL – Fatal Error Occurred: Installation of virtualmin-release failed: 2 FATAL – Cannot continue installation.
FATAL – Attempting to remove virtualmin repository configuration, so the installation can be FATAL – re-attempted after any problems have been resolved. FATAL – Removing temporary directory and files. FATAL – If you are unsure of what went wrong, you may wish to review the log FATAL – in /root/virtualmin-install.log In this case, just re-run the install.sh script.
After that, again, and you should be able to login to Webmin using Unix authentication.
Can you tell me more about unshadow and john command line tools? How does it protect my server from crackers? Both unshadow and john commands are distributed with “John the Ripper security” software. It act as a fast password cracker software. It is a free and Open Source software. It runs on Windows, UNIX and Linux operating system. Use this tool to find out weak users passwords on your own server or workstation powered by Unix-like systems.
John cracking modes John the Ripper can work in the following modes: a Wordlist: John will simply use a file with a list of words that will be checked against the passwords. See RULES for the format of wordlist files. b Single crack: In this mode, john will try to crack the password using the login/GECOS information as passwords. c Incremental: This is the most powerful mode. John will try any character combination to resolve the password. Details about these modes can be found in the MODES file in john’s documentation, including how to define your own cracking methods. Install John the Ripper Password Cracking Tool John the ripper is not installed by default.
If you are using Debian / Ubuntu Linux, enter: $ sudo apt-get install john RHEL, CentOS, Fedora, Redhat Linux user can grab john the ripper here. Once downloaded use the rpm command as follows to install the same: # rpm -ivh john.
How do I use John the ripper to check weak passwords or crack passwords? First use the unshadow command to combines the /etc/passwd and /etc/shadow files so John can use them. You might need this since if you only used your shadow file, the GECOS information wouldn’t be used by the “single crack” mode, and also you wouldn’t be able to use the -shells option. On a normal system you’ll need to run unshadow as root to be able to read the shadow file. Manual suzuki samurai sj413 specification. So login as root or use old good sudo / su command under Debian / Ubuntu Linux: $ sudo /usr/sbin/unshadow /etc/passwd /etc/shadow /tmp/crack.password.db RHEL / CentOS / Fedora Linux user type the following command: # /usr/bin/unshadow /etc/passwd /etc/shadow /tmp/crack.password.db To check weak password (crack password), enter the following command.
These examples uses brute-force CPU-time consuming password cracking techniques. To use John, you just need to supply it a password file created using unshadow command along with desired options. If no mode is specified, john will try “single” first, then “wordlist” and finally “incremental” password cracking methods. $ john /tmp/crack.password.db Output: john /tmp/crack.password.db Loaded 1 password (FreeBSD MD5 32/32) This procedure will take its own time.
To see the cracked passwords, enter: $ john -show /tmp/crack.password.db test:1:1002:test,:/home/test:/bin/bash didi:abc123:1003:1003::/home/didi:/usr/bin/rssh 2 passwords cracked, 1 left Above output clearly indicates that user test has 123456 and didi has abc123 password. Mohammed Noufal Myself Mohammed Noufal, working in one of the leading web-hosting companies in India. In my day-to-day life, l had to face different problems related to Web-hosting. In my website Errorlogz you can find solutions for different Web-hosting related problems. Sometimes, I spent hours on searching/googling to find a solution.
This inspired me to start a website which gives solutions to different Webhosting problems. This website includes basic Linux/windows commands, different control panels like cPanel, Plesk, DirectAdmin, Webmin & so on. Hence I would like to say Errorlogz as an your server protector. I will be glad, if Errorlogz can help any one admin to find a solution to his problem! You can also view my profile on UpWork https://goo.gl/JUkoli.
I failed logging in several times and then Webmin blocked my IP. Getting localhost blocked isn’t a good thing to see. So I searched the Internet for a way to reset the password and I found this procedure:. Login to your computer as root. If you are running a RedHat distribution (i.e. Fedora, CentOS, Gentoo), enter the following command:/usr/libexec/webmin/changepass.pl /etc/webmin username password If you are running a Debian distribution, enter the following command: /usr/share/webmin/changepass.pl /etc/webmin username password. Login to Webmin with your reset password.
Hey thanks, helped me a bunch on Fedora 16. But wanted to inform you of an error. Gentoo is in no way a Red Hat derivative.
Gentoo was made from scratch, and is completely different, as they use ports like a BSD distro, similar to Arch Linux, and uses a source compiler to install packages and not RPM’s like Red Hat distros, nor does it even use YUM. So you got that one backwards bud. So you should fix that. Download font unicode. Because it is quite misleading Anyway thanks though!
It helped me when I forgot my Webmin password on Fedora. Now that I know this though I feel like I should secure that file more, considering its so easy to change a password Doesn’t seem like the safest method, as it wouldn’t be hard for someone to access it remotely unless your apache install was 100% secure.
This page explains how to change Unix users' passwords, using the aptly-named Change Passwords module. Introduction to Unix Passwords On a typical Linux or Unix system, users' passwords are stored in the /etc/shadow file. They can be changed with the passwd command, or by editing that file directly. In Webmin, you can use the module to edit all details of a user, including his password. However, if you just need to change passwords on a regular basis, or want to give a less-trusted admin permissions to only change passwords, the Users and Groups module is un-necessarily complex. The Change Passwords Module This module can be found under the System category.
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When opened, it displays a list of the names of all local users on your system (shown below) for which the current user has permissions to make password changes - which will be all users by default. To change a user's password, do the following:. Click on the user's name on the main menu. Fill in the New password field, and the New password again field. If you want the password change to be made in other modules which have separate password databases (usually a good idea), check the Change password in other modules?. Click the Change button. The Change Passwords module Module access control As described on, it is possible to give a Webmin user access to only part of the functionality of a module.
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In the case of the Change Passwords module, you can limit which users passwords can be edited for. This is particularly useful if you are creating a Webmin login who should only be able to manage users within a certain group, but not touch critical system users like root. You can also select if the Webmin user is required to know the old password for each user being changed, and if he is forced to enter the new password twice.