Extended snort rule add to allow content field

- Exposed the 'content' field in the GRPC server AddRules method
- Allows the 'MALWARE-CNC User-Agent ASafaWeb Scan' signature
in the community rules to be copied to local rules
- Above ensures more deterministic alerts by snort each time
the signature is hit
- Added here to support the SDC configuration guide, which details
how to add this scan rule via GRPC client script

Change-Id: I6945c1e500075444134543bb9eb6003a03f1d5cc
Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>

4 files changed, 36 insertions, 11 deletions

diff --git a/samples/services/snort_ids/docker/grpc/snort.proto b/samples/services/snort_ids/docker/grpc/snort.proto
index 8d69baa..f524bb4 100644
--- a/samples/services/snort_ids/docker/grpc/snort.proto
+++ b/samples/services/snort_ids/docker/grpc/snort.proto
@@ -27,8 +27,9 @@ message AddRule {
   string src_port = 4;
   string src_ip = 5;
   string msg = 6;
-  string sid = 7;
-  string rev = 8;
+  string content = 7;
+  string sid = 8;
+  string rev = 9;
 }
 
 message SnortReply {
diff --git a/samples/services/snort_ids/docker/grpc/snort_client.py b/samples/services/snort_ids/docker/grpc/snort_client.py
index d59b4ee..ca71af8 100644
--- a/samples/services/snort_ids/docker/grpc/snort_client.py
+++ b/samples/services/snort_ids/docker/grpc/snort_client.py
@@ -30,6 +30,8 @@ def run(args, grpc_port='50052'):
         return add_tcprule(stub)
     elif args['cmd'] == 'addicmp':
         return add_icmprule(stub)
+    elif args['cmd'] == 'addscan':
+        return add_scanrule(stub)
     elif args['cmd'] == 'start':
         return start_snort(stub)
     elif args['cmd'] == 'stop':
@@ -78,6 +80,20 @@ def add_icmprule(stub):
     return response.message
 
 
+def add_scanrule(stub):
+    try:
+        response = stub.AddRules(snort_pb2.AddRule(
+            protocol='tcp', dest_port='any', dest_ip='$HOME_NET',
+            src_port='any', src_ip='any',
+            msg='MALWARE-CNC User-Agent ASafaWeb Scan', sid='10000003',
+            rev='001', content='"asafaweb.com"'))
+        print(stop_snort(stub))
+        print(start_snort(stub))
+    except Exception as e:
+        return e
+    return response.message
+
+
 def start_snort(stub):
     try:
         response = stub.StartSnort(snort_pb2.ControlSnort(pid='0'))
diff --git a/samples/services/snort_ids/docker/grpc/snort_pb2.py b/samples/services/snort_ids/docker/grpc/snort_pb2.py
index 93641ef..8828b78 100644
--- a/samples/services/snort_ids/docker/grpc/snort_pb2.py
+++ b/samples/services/snort_ids/docker/grpc/snort_pb2.py
@@ -19,7 +19,7 @@ DESCRIPTOR = _descriptor.FileDescriptor(
   name='snort.proto',
   package='snort',
   syntax='proto3',
-  serialized_pb=_b('\n\x0bsnort.proto\x12\x05snort\"\x1b\n\x0c\x43ontrolSnort\x12\x0b\n\x03pid\x18\x01 \x01(\t\"\x88\x01\n\x07\x41\x64\x64Rule\x12\x10\n\x08protocol\x18\x01 \x01(\t\x12\x11\n\tdest_port\x18\x02 \x01(\t\x12\x0f\n\x07\x64\x65st_ip\x18\x03 \x01(\t\x12\x10\n\x08src_port\x18\x04 \x01(\t\x12\x0e\n\x06src_ip\x18\x05 \x01(\t\x12\x0b\n\x03msg\x18\x06 \x01(\t\x12\x0b\n\x03sid\x18\x07 \x01(\t\x12\x0b\n\x03rev\x18\x08 \x01(\t\"\x1d\n\nSnortReply\x12\x0f\n\x07message\x18\x01 \x01(\t2\xac\x01\n\nController\x12/\n\x08\x41\x64\x64Rules\x12\x0e.snort.AddRule\x1a\x11.snort.SnortReply\"\x00\x12\x36\n\nStartSnort\x12\x13.snort.ControlSnort\x1a\x11.snort.SnortReply\"\x00\x12\x35\n\tStopSnort\x12\x13.snort.ControlSnort\x1a\x11.snort.SnortReply\"\x00\x62\x06proto3')
+  serialized_pb=_b('\n\x0bsnort.proto\x12\x05snort\"\x1b\n\x0c\x43ontrolSnort\x12\x0b\n\x03pid\x18\x01 \x01(\t\"\x99\x01\n\x07\x41\x64\x64Rule\x12\x10\n\x08protocol\x18\x01 \x01(\t\x12\x11\n\tdest_port\x18\x02 \x01(\t\x12\x0f\n\x07\x64\x65st_ip\x18\x03 \x01(\t\x12\x10\n\x08src_port\x18\x04 \x01(\t\x12\x0e\n\x06src_ip\x18\x05 \x01(\t\x12\x0b\n\x03msg\x18\x06 \x01(\t\x12\x0f\n\x07\x63ontent\x18\x07 \x01(\t\x12\x0b\n\x03sid\x18\x08 \x01(\t\x12\x0b\n\x03rev\x18\t \x01(\t\"\x1d\n\nSnortReply\x12\x0f\n\x07message\x18\x01 \x01(\t2\xac\x01\n\nController\x12/\n\x08\x41\x64\x64Rules\x12\x0e.snort.AddRule\x1a\x11.snort.SnortReply\"\x00\x12\x36\n\nStartSnort\x12\x13.snort.ControlSnort\x1a\x11.snort.SnortReply\"\x00\x12\x35\n\tStopSnort\x12\x13.snort.ControlSnort\x1a\x11.snort.SnortReply\"\x00\x62\x06proto3')
 )
 
 
@@ -106,19 +106,26 @@ _ADDRULE = _descriptor.Descriptor(
       is_extension=False, extension_scope=None,
       options=None, file=DESCRIPTOR),
     _descriptor.FieldDescriptor(
-      name='sid', full_name='snort.AddRule.sid', index=6,
+      name='content', full_name='snort.AddRule.content', index=6,
       number=7, type=9, cpp_type=9, label=1,
       has_default_value=False, default_value=_b("").decode('utf-8'),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None, file=DESCRIPTOR),
     _descriptor.FieldDescriptor(
-      name='rev', full_name='snort.AddRule.rev', index=7,
+      name='sid', full_name='snort.AddRule.sid', index=7,
       number=8, type=9, cpp_type=9, label=1,
       has_default_value=False, default_value=_b("").decode('utf-8'),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None, file=DESCRIPTOR),
+    _descriptor.FieldDescriptor(
+      name='rev', full_name='snort.AddRule.rev', index=8,
+      number=9, type=9, cpp_type=9, label=1,
+      has_default_value=False, default_value=_b("").decode('utf-8'),
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      options=None, file=DESCRIPTOR),
   ],
   extensions=[
   ],
@@ -132,7 +139,7 @@ _ADDRULE = _descriptor.Descriptor(
   oneofs=[
   ],
   serialized_start=52,
-  serialized_end=188,
+  serialized_end=205,
 )
 
 
@@ -162,8 +169,8 @@ _SNORTREPLY = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=190,
-  serialized_end=219,
+  serialized_start=207,
+  serialized_end=236,
 )
 
 DESCRIPTOR.message_types_by_name['ControlSnort'] = _CONTROLSNORT
@@ -200,8 +207,8 @@ _CONTROLLER = _descriptor.ServiceDescriptor(
   file=DESCRIPTOR,
   index=0,
   options=None,
-  serialized_start=222,
-  serialized_end=394,
+  serialized_start=239,
+  serialized_end=411,
   methods=[
   _descriptor.MethodDescriptor(
     name='AddRules',
diff --git a/samples/services/snort_ids/docker/grpc/snort_server.py b/samples/services/snort_ids/docker/grpc/snort_server.py
index 3c2fdb1..9ece832 100644
--- a/samples/services/snort_ids/docker/grpc/snort_server.py
+++ b/samples/services/snort_ids/docker/grpc/snort_server.py
@@ -35,7 +35,8 @@ class Controller(snort_pb2_grpc.ControllerServicer):
             f = open(file_local, 'a')
             rule = 'alert {} {} {} -> {} {} '.format(
                 r.protocol, r.src_ip, r.src_port, r.dest_ip, r.dest_port) \
-                + '(msg:"{}"; sid:{}; rev:{};)\n'.format(r.msg, r.sid, r.rev)
+                + '(msg:"{}"; content:{}; sid:{}; rev:{};)\n'.format(
+                                      r.msg, r.content, r.sid, r.rev)
             f.write(rule)
             f.close
             msg = "Added to local rules"