Eve-NG - Reset a Linux VM password
It's Saturday morning and I think to myself, "Hey, let's hop into that Eve-NG lab I set up last month and update some of the nodes." Well too bad, that password I'll never forget has been forgotten, it's time to set a new password I won't forget.
Gather some information
We'll need the UUID of the lab and the ID of the node that needs to have its password reset. You can find both in the Eve-NG GUI or command line.
GUI
First we'll need the Lab's UUID. If you only have one, you can skip this step.
Select your lab then click "Lab Details".
We'll also need the ID of the image that needs to be fixed. Click "Nodes" in the side bar to bring up the list. My neglected child in this case is "velogw" which is id:6.
CLI
Eve-NG labs are stored in /opt/unetlab/labs
# Grab lab UUID - in this example, "Before-After-v2.unl"
root@eve-ng:/opt/unetlab/labs# grep -E "^<lab" Before-After-v2.unl
<lab name="Before-After-v2" id="e437388f-5921-44d6-b0bd-ddc412420057" version="1"
scripttimeout="300" lock="0">
# Grab instance UUID - in this example, "velogw"
root@eve-ng:/opt/unetlab/labs# grep "velogw" Before-After-v2.unl | awk '{print $2,$3}'
id="6" name="velogw"
API
You can also use the API to get the lab/node IDs but that's a rabbit hole for another day.
Shutdown the VM
Generate a new password
root@eve-ng:~# openssl passwd -1 SuperSecureExample $1$2y4Zveuk$5hXJrZUJ2KNOUv6ROMAYE.
Install Guestfish
apt install libguestfs-tools
Locate the node's QCOW2
It's in /opt/unetlab/tmp/0/<LAB_UUID>/<NODE_ID>.
root@eve-ng:~# cd /opt/unetlab/tmp/0/e437388f-5921-44d6-b0bd-ddc412420057/6
root@eve-ng:/opt/unetlab/tmp/0/e437388f-5921-44d6-b0bd-ddc412420057/6#
root@eve-ng:/opt/unetlab/tmp/0/e437388f-5921-44d6-b0bd-ddc412420057/6# ls
virtioa.qcow2 wrapper.txt
Load the QCOW2 into guestfish
root@eve-ng:/opt/unetlab/tmp/0/e437388f-5921-44d6-b0bd-ddc412420057/6# guestfish --rw -a
./virtioa.qcow2
Welcome to guestfish, the guest filesystem shell for
editing virtual machine filesystems and disk images.
Type: 'help' for help on commands
'man' to read the manual
'quit' to quit the shell
# Launch the thing.
><fs> launch
100%
# Get filesystems
><fs> list-filesystems
/dev/sda1: ext4
# Mount filesystem
><fs> mount /dev/sda1 /
# Edit the password
><fs> vi /etc/shadow
# Look for the user you want to reset, password section highlighted below.
vcadmin:$1$g4XfHfg6$vuMiPfkgiLDK8pXjwR5hC.:18345:0:90:7:::
# Replace that with the password info we generated earlier.
vcadmin:$1$2y4Zveuk$5hXJrZUJ2KNOUv6ROMAYE.:18345:0:90:7:::
# Quit guestfish
><fs> quit
Restart the VM and login.
VCG login: vcadmin
Password:
You are required to change your password immediately (password aged)
Changing password for vcadmin.
(current) UNIX password:
Enter new UNIX password:
Retype new UNIX password:
Last login: Sun Jul 12 14:44:45 UTC 2020 from 192.168.110.1 on pts/0
Welcome to Velocloud VCG (GNU/Linux 3.13.0-176-generic x86_64)
vcadmin@VCG:~$
apt install libguestfs-tools
root@eve-ng:~# cd /opt/unetlab/tmp/0/e437388f-5921-44d6-b0bd-ddc412420057/6 root@eve-ng:/opt/unetlab/tmp/0/e437388f-5921-44d6-b0bd-ddc412420057/6# root@eve-ng:/opt/unetlab/tmp/0/e437388f-5921-44d6-b0bd-ddc412420057/6# ls virtioa.qcow2 wrapper.txt
root@eve-ng:/opt/unetlab/tmp/0/e437388f-5921-44d6-b0bd-ddc412420057/6# guestfish --rw -a ./virtioa.qcow2 Welcome to guestfish, the guest filesystem shell for editing virtual machine filesystems and disk images. Type: 'help' for help on commands 'man' to read the manual 'quit' to quit the shell # Launch the thing. ><fs> launch 100% # Get filesystems ><fs> list-filesystems /dev/sda1: ext4 # Mount filesystem ><fs> mount /dev/sda1 / # Edit the password ><fs> vi /etc/shadow # Look for the user you want to reset, password section highlighted below. vcadmin:$1$g4XfHfg6$vuMiPfkgiLDK8pXjwR5hC.:18345:0:90:7::: # Replace that with the password info we generated earlier. vcadmin:$1$2y4Zveuk$5hXJrZUJ2KNOUv6ROMAYE.:18345:0:90:7::: # Quit guestfish ><fs> quit
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