added new module reversedns.py, added reversedns to __init__.py

misp_modules/modules/expansion/__init__.py

@@ -1,2 +1,2 @@
 __all__ = ['asn_history', 'circl_passivedns', 'circl_passivessl', 'countrycode', 'cve', 'dns',
-           'eupi', 'ipasn', 'passivetotal', 'sourcecache', 'virustotal', 'whois', 'shodan']
+           'eupi', 'ipasn', 'passivetotal', 'sourcecache', 'virustotal', 'whois', 'shodan', 'reversedns']

misp_modules/modules/expansion/reversedns.py

@@ -0,0 +1,64 @@
+import json
+import dns.reversename, dns.resolver
+
+misperrors = {'error': 'Error'}
+mispattributes = {'input': ['ip-src', 'ip-dst', 'domain|ip'], 'output': ['hostname']}
+
+# possible module-types: 'expansion', 'hover' or both
+moduleinfo = {'version': '0.1', 'author': 'Andreas Muehlemann',
+              'description': 'Simple Reverse DNS expansion service to resolve reverse DNS from MISP attributes',
+              'module-type': ['expansion', 'hover']}
+
+# config fields that your code expects from the site admin
+moduleconfig = ['nameserver']
+
+def handler(q=False):
+    if q is False:
+        return False
+    request = json.loads(q)
+    if request.get('ip-dst'):
+        toquery = request['ip-dst']
+    elif request.get('ip-src'):
+        toquery = request['ip-src']
+    elif request.get('domain|ip'):
+        toquery = request['domain|ip'].split('|')[1]
+    else:
+        return False
+
+    # reverse lookup for ip
+    revname = dns.reversename.from_address(toquery)
+
+    r = dns.resolver.Resolver()
+    r.timeout = 2
+    r.lifetime = 2
+
+    if request.get('config'):
+        if request['config'].get('nameserver'):
+            nameservers = []
+            nameservers.append(request['config'].get('nameserver'))
+            r.nameservers = nameservers
+    else:
+        r.nameservers = ['8.8.8.8']
+
+    try:
+        answer = r.query(revname, 'PTR')
+    except dns.resolver.NXDOMAIN:
+        misperrors['error'] = "NXDOMAIN"
+        return misperrors
+    except dns.exception.Timeout:
+        misperrors['error'] = "Timeout"
+        return misperrors
+    except:
+        misperrors['error'] = "DNS resolving error"
+        return misperrors
+
+    r = {'results': [{'types': mispattributes['output'],
+                      'values':[str(answer[0])]}]}
+    return r
+
+def introspection():
+    return mispattributes
+
+def version():
+    moduleinfo['config'] = moduleconfig
+    return moduleinfo