1 files changed, 51 insertions, 14 deletions
diff --git a/manifests/ssh_authorized_key.pp b/manifests/ssh_authorized_key.pp
index 7201f8b..80cb3b7 100644
--- a/manifests/ssh_authorized_key.pp
+++ b/manifests/ssh_authorized_key.pp
@@ -5,7 +5,8 @@ define sshd::ssh_authorized_key(
     $key = 'absent',
     $user = '',
     $target = undef,
-    $options = 'absent'
+    $options = 'absent',
+    $override_builtin = undef
 ){
 
   if ($ensure=='present') and ($key=='absent') {
@@ -29,20 +30,56 @@ define sshd::ssh_authorized_key(
       $real_target = $target
     }
   }
-  ssh_authorized_key{$name:
-    ensure => $ensure,
-    type   => $type,
-    key    => $key,
-    user   => $real_user,
-    target => $real_target,
-  }
 
-  case $options {
-    'absent': { info("not setting any option for ssh_authorized_key: ${name}") }
-    default: {
-      Ssh_authorized_key[$name]{
-        options => $options,
-      }
+  # The ssh_authorized_key built-in function (in 2.7.23 at least)
+  # will not write an authorized_keys file for a mortal user to
+  # a directory they don't have write permission to, puppet attempts to
+  # create the file as the user specified with the user parameter and fails.
+  # Since ssh will refuse to use authorized_keys files not owned by the
+  # user, or in files/directories that allow other users to write, this
+  # behavior is deliberate in order to prevent typical non-working
+  # configurations. However, it also prevents the case of puppet, running
+  # as root, writing a file owned by a mortal user to a common
+  # authorized_keys directory such as one might specify in sshd_config with
+  # something like
+  #  'AuthorizedKeysFile /etc/ssh/authorized_keys/%u'
+  # So we provide a way to override the built-in and instead just install
+  # via a file resource. There is no additional security risk here, it's
+  # nothing a user can't already do by writing their own file resources,
+  # we still depend on the filesystem permissions to keep things safe.
+  if $override_builtin {
+    $header = "# HEADER: This file is managed by Puppet.\n"
+
+    if $options == 'absent' {
+      info("not setting any option for ssh_authorized_key: ${name}")
+      $content = "${header}${type} ${key}\n"
+    } else {
+      $content = "${header}${options} ${type} ${key}\n"
+    }
+
+    file { $real_target:
+      ensure  => $ensure,
+      content => $content,
+      owner   => $real_user,
+      mode    => '0600',
+    }
+
+  } else {
+
+    if $options == 'absent' {
+      info("not setting any option for ssh_authorized_key: ${name}")
+    } else {
+      $real_options = $options
+    }
+
+    ssh_authorized_key{$name:
+      ensure  => $ensure,
+      type    => $type,
+      key     => $key,
+      user    => $real_user,
+      target  => $real_target,
+      options => $real_options,
     }
   }
+
 }