restrict access for backups

Change-Id: Id36b26c87bafa62d1016085baeeeb8e52f35b7e0
diff --git a/cassandra/backup.sls b/cassandra/backup.sls
index aeadfbe..84e2272 100644
--- a/cassandra/backup.sls
+++ b/cassandra/backup.sls
@@ -126,10 +126,27 @@
 
 {%- if key.get('enabled', False) %}
 
+{%- set clients = [] %}
+{%- for node_name, node_grains in salt['mine.get']('*', 'grains.items').iteritems() %}
+{%- if node_grains.get('cassandra', {}).get('backup', {}).get('client') %}
+{%- set client = node_grains.get('cassandra').get('backup').get('client') %}
+{%- if client.get('addresses') and client.get('addresses', []) is iterable %}
+{%- for address in client.addresses %}
+{%- do clients.append(address|string) %}
+{%- endfor %}
+{%- endif %}
+{%- endif %}
+{%- endfor %}
+
 cassandra_key_{{ key.key }}:
   ssh_auth.present:
   - user: cassandra
   - name: {{ key.key }}
+  - options:
+    - no-pty
+{%- if clients %}
+    - from="{{ clients|join(',') }}"
+{%- endif %}
   - require:
     - file: {{ backup.backup_dir }}/full
 
diff --git a/cassandra/meta/salt.yml b/cassandra/meta/salt.yml
new file mode 100644
index 0000000..06af0bc
--- /dev/null
+++ b/cassandra/meta/salt.yml
@@ -0,0 +1,21 @@
+{%- if pillar.get('cassandra', {}).get('backup', {}).get('client') %}
+
+{%- set addresses = [] %}
+{%- set ips = salt['grains.get']("fqdn_ip4")|list %}
+{%- if ips %}
+  {%- for ip in ips %}
+    {%- if not (ip|string).startswith('127.')  %}
+    {%- do addresses.append(ip) %}
+    {%- endif %}
+  {%- endfor %}
+{%- endif %}
+{%- if addresses %}
+grain:
+  cassandra:
+    cassandra:
+      backup:
+        client:
+          addresses: {{ addresses|yaml }}
+{%- endif %}
+
+{%- endif %}