2019-10-15 The password lookup will generate a new random password each time, but will not write it to /dev/null. This can be used when you need a password without storing it on the controller. Generated passwords contain a random mix of upper and lowercase ASCII letters, the. Dec 08, 2016 I tried to use the solution posted in the Ansible issue but I couldn't make it work, so I looked for another way to generate a random string without using /dev/urandom. The one that I've managed to make it work uses date, but since it also uses sha256sum and base64 I'm not 100% sure it'll work in other OSs.
Replace my-ansible-vault-pw with a random string of your choosing. Now we can create an encrypted SSH password for our remote host using that passphrase. The following command will do just that.
So I need to create an user in a machine so I can then have a script that will log into this machine and backup its database. Which database is that, you might ask? For this discussion it does not matter besides that it is running in a Linux box. But, if you want a more specific example, we could be backing up a sqlite database since we talked about how to do the deed before.
Anyway, the plan is to have the script ssh into the database server and grab the backup. Since we are using ssh in the script, we might as well use key pair authentication. Now I have learned that by default if you create a user and do not assign it a password, you will not be able to login as said user using key pair authentication. You can turn that off but I would rather not. Instead, since I am creating said user programmatically, I can give it a long random password.
Now that we have a plan, let's see how to do it in an ansible playbook. I will present only the relevant bits since I do not know how you do your playbooks. So, we could create a user using something like
which would create user user_name who will also belong to the groups defined in user_groups, where user_name and user_groups are variables defined somewhere earlier in the show. And this would create a user without a password, which would do us no good. Nor would us make the playbook stop and ask us to enter a password. We said earlier we are going to create a random password, so let's see if we can make something random enough for our needs.
I plan on generating this random password in the machine we are running ansible on, not the target machine. One of the reasons is that I want to use the Linux command mkpassword to create the password hash (note it is being called using the shell command. So, I will use a local_action to do the deed. For instance, let's say I want the password to be pickles and encoded using SHA-512 hash (mild encryption). I could accomplish it by writing
This would create a hash, say
and assign it to the variable user_pw. This of course has to be done before the user is created. To use it with our new user, we can then modify our little user creation function to something like this:
In the last line we are feeding the value of user_pw, user_pw.stdout, to password. But why can't I just feed user_pw? Here's an exercise to you: tell your playbook just print user_pw. Doesn't it look very object-like?
If you run your playbook and all went well, go to the target machine and check if there is a password associated with the user in /etc/shadow. If the user was already created, you will need to delete user and let ansible recreate it. Cx one v4 keygen download.
So we have so far created a way to create a password hash and then create a new user with that password. The last step we need is to make the password random. Here is what I am proposing: how about if we use date since epoch in seconds as our password and then mangle it a bit? Here is a simple mangling example:
Which gives b8a49ccaa4721877cf39e510c7ac3622 as the output, which should be long enough to fulfill our needs. Of course if you run it again, it will spit out a different result, which is what we want? Perfectly random? Not by a long shot, but it is long enough for our needs. Remember: there is nothing saying you have to use the above. Hav efun creating your own function!
So, let's apply that to our little password generating function:
And we should be good to go. Here is how the final version should look like in a playbook:
Now we have an user, we can then create the ssh key pair we talked about in an earlier article. Of course we might edit the ./ssh/authorized_keys Sound blaster recon3di driver windows 10 alienware. file to restrict what that key can do.
Linux stores users’ encrypted passwords, as well as other security information, such as account or password expiration values, in the
/etc/shadow
file.Someday you may need to edit the
/etc/shadow
file manually to set or change ones password.Unlike the
/etc/passwd
that is readable for everyone, the /etc/shadow
file MUST be readable by the ROOT user only.For this you would have to generate password hash in the format compatible with
/etc/shadow
.Cool Tip: Want to create a USER with ROOT privileges? This can be very dangerous! But if you insist… Read more →
Magix samplitude pro x2 suite keygen. There is no need to install any additional tools as it can be easily done from the Linux command line using Python.
Generate Password Hash for /etc/shadow
The encrypted passwords in/etc/shadow
file are stored in the following format:The $ID indicates the type of encryption, the $SALT is a random (up to 16 characters) string and $ENCRYPTED is a password’s hash.
Hash Type | ID | Hash Length |
---|---|---|
MD5 | $1 | 22 characters |
SHA-256 | $5 | 43 characters |
SHA-512 | $6 | 86 characters |
Cool Tip: Got a hash but don’t know what type is it? Find out how to easily identify different hash types! Read more →
Use the below commands from the Linux shell to generate hashed password for
/etc/shadow
with the random salt.Generate MD5 password hash:
Ansible Generate Random String Of Char Java Eclipse
Generate SHA-256 password hash:
Generate SHA-512 password hash:
Ansible Generate Random Hex String
Hope these commands will be helpful.
Just don’t forget to replace MySecretPassword with YourSecretPassword.
As you can see, it is really very easy to generate hashes for the
/etc/shadow
from the Linux command line using Python.Particularly for the reason that the Python is installed by default on the most Linux distributions.