From c0e20bfec90862d61b75687eb9ce8f1c85ea34c3 Mon Sep 17 00:00:00 2001
From: Christoph Egger <christoph@anonymous.siccegge.de>
Date: Wed, 29 Oct 2014 21:47:10 +0100
Subject: [PATCH] add dnssec checkscript

---
 dnssec-check | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 dnssec-check

diff --git a/dnssec-check b/dnssec-check
new file mode 100644
index 0000000..5753be1
--- /dev/null
+++ b/dnssec-check
@@ -0,0 +1,61 @@
+#!/usr/bin/python
+
+import ldns
+import unbound
+from optparse import OptionParser
+import sys
+from datetime import datetime, timedelta
+
+def parse_rrsig_expire(expirestring):
+    expires = datetime(int(expirestring[:4]),
+                       int(expirestring[4:6]),
+                       int(expirestring[6:8]),
+                       int(expirestring[8:10]),
+                       int(expirestring[10:12]),
+                       int(expirestring[12:14]))
+
+    delta = expires - datetime.utcnow()
+    return delta
+
+def check_dnssec_expire(resolver, name, warn, crit):
+    s, result = resolver.resolve(name)
+    if 0 != s:
+        pass
+
+    s, packet = ldns.ldns_wire2pkt(result.packet)
+    rrsigs = packet.rr_list_by_type(unbound.RR_TYPE_RRSIG, ldns.LDNS_SECTION_ANSWER).rrs()
+    for rrsig in rrsigs:
+        delta = parse_rrsig_expire(str(rrsig.rrsig_expiration()))
+
+        if delta < crit:
+            print "CRIT (%s) %s" % (delta, name)
+        elif delta < warn:
+            print "WARN (%s) %s" % (delta, name)
+    
+
+def main():
+    parser = OptionParser()
+    parser.add_option("-n", "--name",
+                      action="append", type="string", dest="names",
+                      help="DNS Names to check")
+    parser.add_option("-a", "--ancor",
+                      action="store", type="string", dest="ancor",
+                      default="/etc/unbound/root.key",
+                      help="DNSSEC root ancor")
+    parser.add_option("-w", "--warning-days",
+                      action="store", type=int, dest="warn", default=5,
+                      help="minimum remaining validity in days before a warning is issued")
+    parser.add_option("-c", "--critical-days",
+                      action="store", type=int, dest="crit", default=2,
+                      help="minimum remaining validity in days before a warning is issued")
+    
+        
+    opts, _args = parser.parse_args()
+    resolver = unbound.ub_ctx()
+    resolver.add_ta_file(opts.ancor)
+    
+    for name in  opts.names:
+        check_dnssec_expire(resolver, name, timedelta(opts.warn), timedelta(opts.crit))
+
+if __name__ == "__main__":
+    main()
-- 
2.39.5