Merge branch 'parser-snort'

[people/stevee/guardian.git] / modules / Parser.pm

diff --git a/modules/Parser.pm b/modules/Parser.pm
index 5c2f53fa79437753d3a10dbdcf7fd44a4676d0e9..255e6cc3012aa80e54df13639f2f5d02794e8a07 100644 (file)
--- a/modules/Parser.pm
+++ b/modules/Parser.pm
@@ -71,12 +71,58 @@ sub IsSupportedParser ($) {
 ## This subfunction is responsible for parsing sort alerts and determine if
 ## an action should be performed.
 #
-sub message_parser_snort($) {
+## XXX Currently the parser only supports IPv4. Add support for IPv6 at a
+## later time.
+#
+sub message_parser_snort(@) {
        my @message = @_;
 
-       # XXX
-       # Currently this parser just returns a simple message.
-       return "$message[0] SNORT A simple Snort Message";
+       # The name of the parser module.
+       my $name = "SNORT";
+
+       # Variable to store the grabbed IP-address.
+       my $address;
+
+       # Default returned message in case no one could be grabbed
+       # from the snort alert.
+       my $message = "An active snort rule has matched and gained an alert.";
+
+       # A snort alert contains multiple lines, loop through all lines
+       # to parse the complete alert.
+       foreach my $line (@message) {
+               # Check Priority Level and skip the alert if it is to low.
+               #if ($line =~ /.*\[Priority: (\d+)\].*/) {
+               #       return unless($1 < $priority);
+               #}
+
+               # Search for a line like xxx.xxx.xxx.xxx -> xxx.xxx.xxx.xxx
+               if ($line =~ /(\d+\.\d+\.\d+\.\d+)+ -\> (\d+\.\d+\.\d+\.\d+)+/) {
+                       # Store the grabbed IP-address.
+                       $address = $1;
+               }
+
+               # Search for a line like xxx.xxx.xxx.xxx:xxx -> xxx.xxx.xxx.xxx:xxx
+               elsif ($line =~ /(\d+\.\d+\.\d+\.\d+):\d+ -\> (\d+\.\d+\.\d+\.\d+):\d+/) {
+                       # Store the obtained IP-address.
+                       $address = $1;
+               }
+
+               # Obtain the reported reason.
+               if ($line =~ /.*msg:\"(.*)\".*/) {
+                       # Store the extracted message.
+                       $message = $1;
+               }
+       }
+
+       # Check if at least the IP-address information are obtained from the
+       # provided alert.
+       if ($address) {
+               # Return the extracted values.
+               return "$address $name $message";
+       }
+
+       # If we got here, the alert could not be parsed correctly, return nothing.
+       return;
 }
 
 #