Add a function to create ssh keys on the fly

This allows you to use content of ssh keys within your manifests
and generate them automatically if they don't exist yet.

1 files changed, 23 insertions, 0 deletions

diff --git a/lib/puppet/parser/functions/ssh_keygen.rb b/lib/puppet/parser/functions/ssh_keygen.rb
new file mode 100644
index 0000000..18b006a
--- /dev/null
+++ b/lib/puppet/parser/functions/ssh_keygen.rb
@@ -0,0 +1,23 @@
+Puppet::Parser::Functions::newfunction(:ssh_keygen, :type => :rvalue, :doc =>
+  "Returns an array containing the ssh private and public (in this order) key
+  for a certain private key path.
+  It will generate the keypair if both do not exist. It will also generate
+  the directory hierarchy if required.
+  It accepts only fully qualified paths, everything else will fail.") do |args|
+    raise Puppet::ParseError, "Wrong number of arguments" unless args.to_a.length == 1
+    private_key_path = args
+    raise Puppet::ParseError, "Only fully qualified paths are accepted" unless private_key_path =~ /^\/.+/
+    public_key_path = "#{private_key_path}.pub"
+    raise Puppet::ParseError, "Either only the private or only the public key exists" if File.exists?(private_key_path) ^ File.exists?(public_key_path)
+    [private_key_path,public_key_path].each do |path|
+      raise Puppet::ParseError, "#{path} is a directory" if File.directory?(path)
+    end
+
+    dir = File.dirname(private_key_path)
+    Puppet::Util.recmkdir(dir,0700) unless File.directory?(dir)
+    unless [private_key_path,public_key_path].all?{|path| File.exists?(path) }
+      output = Puppet::Util.execute(['/usr/bin/ssh-keygen','-t', 'rsa', '-b', '4096', '-f', private_key_path, '-P', '', '-q'])
+      raise Puppet::ParseError, "Something went wrong during key generation! Output: #{output}" unless output.empty?
+    end
+    [File.read(private_key_path),File.read(public_key_path)]
+end