Add initial rate-limiting for outgoing SMTP, using postfwd (#5972)

Change-Id: I6a6e68908b71d7499eb3ef3c7f0173b3d5b7baa2

1 files changed, 49 insertions, 0 deletions

diff --git a/puppet/modules/postfwd/manifests/init.pp b/puppet/modules/postfwd/manifests/init.pp
new file mode 100644
index 00000000..b00bb071
--- /dev/null
+++ b/puppet/modules/postfwd/manifests/init.pp
@@ -0,0 +1,49 @@
+# This class provides rate-limiting for outgoing SMTP, using postfwd
+# it is configured with some limits that seem reasonable for a generic
+# use-case. Each of the following applies to sasl_authenticated users:
+#
+# . 150 recipients at a time
+# . no more than 50 messages in 60 minutes
+# . no more than 250 recipients in 60 minutes.
+#
+# This class could be easily extended to add overrides to these rules,
+# maximum sizes per client, or additional rules
+class postfwd {
+
+  ensure_packages(['libnet-server-perl', 'libnet-dns-perl', 'postfwd'])
+
+  file {
+    '/etc/default/postfwd':
+      source  => 'puppet:///modules/postfwd/postfwd',
+      mode    => '0644',
+      owner   => root,
+      group   => root,
+      require => Package['postfwd'];
+
+    '/etc/postfix/postfwd.cf':
+      content => template('postfwd/postfwd.cf.erb'),
+      mode    => '0644',
+      owner   => root,
+      group   => root,
+      require => File['/etc/postfix'];
+  }
+
+  exec {
+    '/etc/init.d/postfwd reload':
+      refreshonly => true,
+      subscribe   => [ File['/etc/postfix/postfwd.cf'],
+                       File['/etc/default/postfwd'] ];
+  }
+
+  service {
+    'postfwd':
+      ensure     => running,
+      name       => postfwd,
+      pattern    => '/usr/sbin/postfwd',
+      enable     => true,
+      hasrestart => true,
+      hasstatus  => false,
+      require    => [ File['/etc/default/postfwd'],
+                      File['/etc/postfix/postfwd.cf']];
+  }
+}