02-12-2019
Help with password 'maintenance' or maybe I just need to generate ssh keys?
Hi gurus,
I am NOT the SA of the servers so very limited on what I can do. Basically the scenario is like this:
Every 6 months our password expires and we have to reset them to comply to some password rules. Thing is users, me included, tend to have plaintext copy of this difficult to remember password and copy and paste when we use PuTTY to ssh to the servers. There is about 20+ servers and we've been provided a passmass expect script to use whenever we need to do a password reset.
passmass works fine, it does the job in so far as password resetting to all servers is concern. Remembering the very difficult password however is a challenge. I use KeePass at the moment to save the password and copy and paste to PuTTY. We don't always ahve KeePass, so I want to save the password in one of the servers. I am thinking of creating a text file and openssl encrypt/decrypt and copy and paste the password every time I need to access my current password. I can't think of any other way
but I am sure may be I just don't know that there is a better way out there somewhere, hence I am posting this to the forum.
Question is, does generating ssh keys and placing it in all the servers make it easier so that I don't have to supply the password when I ssh to each server? Do I have to update the ssh keys as well every so often whenever I do a password reset which means I have to manually copy it to all the 20+ servers? Or maybe there is a way that I can store the password in PuTTY?
Please advise. Thanks in advance.
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LEARN ABOUT DEBIAN
expect_passmass
PASSMASS(1) General Commands Manual PASSMASS(1)
NAME
passmass - change password on multiple machines
SYNOPSIS
passmass [ host1 host2 host3 ... ]
INTRODUCTION
Passmass changes a password on multiple machines. If you have accounts on several machines that do not share password databases, Passmass
can help you keep them all in sync. This, in turn, will make it easier to change them more frequently.
When Passmass runs, it asks you for the old and new passwords. (If you are changing root passwords and have equivalencing, the old pass-
word is not used and may be omitted.)
Passmass understands the "usual" conventions. Additional arguments may be used for tuning. They affect all hosts which follow until
another argument overrides it. For example, if you are known as "libes" on host1 and host2, but "don" on host3, you would say:
passmass host1 host2 -user don host3
Arguments are:
-user
User whose password will be changed. By default, the current user is used.
-rlogin
Use rlogin to access host. (default)
-slogin
Use slogin to access host.
-ssh
Use ssh to access host.
-telnet
Use telnet to access host.
-program
Next argument is a program to run to set the password. Default is "passwd". Other common choices are "yppasswd" and "set
passwd" (e.g., VMS hosts). A program name such as "password fred" can be used to create entries for new accounts (when run as
root).
-prompt
Next argument is a prompt suffix pattern. This allows the script to know when the shell is prompting. The default is "# " for
root and "% " for non-root accounts.
-timeout
Next argument is the number of seconds to wait for responses. Default is 30 but some systems can be much slower logging in.
-su
Next argument is 1 or 0. If 1, you are additionally prompted for a root password which is used to su after logging in. root's
password is changed rather than the user's. This is useful for hosts which do not allow root to log in.
HOW TO USE
The best way to run Passmass is to put the command in a one-line shell script or alias. Whenever you get a new account on a new machine,
add the appropriate arguments to the command. Then run it whenever you want to change your passwords on all the hosts.
CAVEATS
Using the same password on multiple hosts carries risks. In particular, if the password can be stolen, then all of your accounts are at
risk. Thus, you should not use Passmass in situations where your password is visible, such as across a network which hackers are known to
eavesdrop.
On the other hand, if you have enough accounts with different passwords, you may end up writing them down somewhere - and that can be a
security problem. Funny story: my college roommate had an 11"x13" piece of paper on which he had listed accounts and passwords all across
the Internet. This was several years worth of careful work and he carried it with him everywhere he went. Well one day, he forgot to
remove it from his jeans, and we found a perfectly blank sheet of paper when we took out the wash the following day!
SEE ALSO
"Exploring Expect: A Tcl-Based Toolkit for Automating Interactive Programs" by Don Libes, O'Reilly and Associates, January 1995.
AUTHOR
Don Libes, National Institute of Standards and Technology
7 October 1993 PASSMASS(1)