Script to generate certificates & Puppet-code
My laziness knows no bounds, I use the script below to automate writing automation puppet code for creating new users (and generating, converting and mailing their certificates too)…
This ruby script will read information from a CSV-file and:
- generate certificate with a random passphrase
- create a Putty version
- email the (encrypted) certificates to the user
- prints the Puppet-resource definition to STDOUT
- store the passphrase in a textfile
It will check if the certificates have already been generated (check if directory exists), so you can just add to the CSV-file.
Installing
Prerequisites:
- Ruby of course
- some rubygems: mail, csv
- pwgen
- ssh-keygen
- puttygen
Just put the files below in the same directory.
Usage
Edit the userlist.txt to add users; the format is:
userid,username,name,email,groups (groups ; seperated)
Example:
"1001","gertest","Ger Apeldoorn","g.apeldoorn@example.nl","admin;dev;prutsor" "1002","gertest2","Ger Apeldoorn","g.apeldoorn@example.nl","admin;dev;prutsor"
After that’s done, just run the script:
./gencerts.rb
Example output:
@pe_accounts::user { 'gertest': locked => false, comment => 'Ger Apeldoorn', uid => '999', gid => '999', groups => ["admin", "dev", "prutsor"], sshkeys => ['ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCnCWb6yiDpOdtzJ3w0Hf/MOIvXswpqu3XnotDtgAkJaH/ZtC/wNrwAsm+ugyGtTmWTX22LdJ1M4mr0KYk7cj1m6QlKp78R4485uERFn0/q6LAJSqKYzEFY53SGECCn/BVZWYDJQ6UcoslouSiIsDivC+rwrG4UGAwdyDSED4PrT0U2kTkPeadbxqvT3FcHcO1HuQF8nMZ g.apeldoorn@example.nl'], }
After running this, the user receives an email with mailtext.txt as contents and three attachments:
- id_rsa
- id_rsa.pub
- putty_private.ppk
Note that the private keys are protected with the passphrase… 🙂
Files
gencerts.rb:
#!/usr/bin/env ruby CSVFILE = 'userlist.txt' EMAILCONTENT = 'mailtext.txt' CURDIR = Dir.pwd require 'csv' require 'rubygems' gem 'mail' require 'mail' def which(cmd) exts = ENV['PATHEXT'] ? ENV['PATHEXT'].split(';') : [''] ENV['PATH'].split(File::PATH_SEPARATOR).each do |path| exts.each { |ext| exe = "#{path}/#{cmd}#{ext}" return exe if File.executable? exe } end return nil end def preflight_checks #see if apps are installed and in path puts "pwgen is not installed" if not which('pwgen') puts "ssh-keygen is not installed" if not which('ssh-keygen') puts "puttygen is not installed" if not which('puttygen') end def send_email(username, email) mail = Mail.new do from 'linuxbeheer@fundeon.nl' to email subject 'Your SSH keys' body File.read(File.join(CURDIR, EMAILCONTENT)) end mail.add_file(File.join(CURDIR, username, "id_rsa")) mail.add_file(File.join(CURDIR, username, "id_rsa.pub")) mail.add_file(File.join(CURDIR, username, "putty_private.ppk")) mail.delivery_method :sendmail mail.deliver end def print_puppetconfig(userid,username,name,email,groups) puts "@pe_accounts::user { '#{username}':" puts " locked => false," puts " comment => '#{name}'," puts " uid => '#{userid}'," puts " gid => '#{userid}'," puts " groups => #{groups.split(";").inspect}," pubkey = File.read(File.join(CURDIR, username, "id_rsa.pub")).chomp puts " sshkeys => ['#{pubkey}']," puts "}" end preflight_checks CSV.foreach(CSVFILE) do |row| userid,username,name,email,groups = row if File.exists?(File.join(CURDIR, username)) puts "Directory for user #{username} already exists" next end Dir.mkdir(File.join(CURDIR, username)) Dir.chdir(File.join(CURDIR, username)) passphrase=`pwgen -c -n -1 10` passphrase.chomp! #Create SSH keypair `ssh-keygen -C #{email} -P #{passphrase} -f id_rsa` #Convert SSH keypair to Putty `echo #{passphrase} | puttygen id_rsa -O private -o putty_private.ppk` #Save the passphrase File.open("passphrase", 'w') {|f| f.write(passphrase) } send_email(username, email) print_puppetconfig(userid,username,name,email,groups) end
mailtext.txt:
Hi, You will find your OpenSSH and Putty keys attached. You can use these keys to login to any Linux server for which you are authorized. You can get the passphrase from -----. Kind regards. Le Pinguin
Have fun!
Labels:howto, inrichting, overig, techniek, workflow