Merge branch 'parser-snort'

diff --cc modules/Parser.pm
index 5c2f53fa79437753d3a10dbdcf7fd44a4676d0e9,db54cf35f95f2cae7910556ffe297d70df844d50..255e6cc3012aa80e54df13639f2f5d02794e8a07
--- 1/modules/Parser.pm
--- 2/modules/Parser.pm
+++ b/modules/Parser.pm
@@@ -71,127 -71,58 +71,173 @@@ 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;
  }
  
 +#
 +## The SSH message parser.
 +#
 +## This subfunction is used for parsing and detecting different attacks
 +## against the SSH service.
 +#
 +sub message_parser_ssh (@) {
 +      my @message = @_;
 +      my @actions;
 +
 +      # The name of the parser module.
 +      my $name = "SSH";
 +
 +      # Variable to store the grabbed IP-address.
 +      my $address;
 +
 +      # Variable to store the parsed event.
 +      my $message;
 +
 +      # Loop through all lines, in case multiple one have
 +      # been passed.
 +      foreach my $line (@message) {
 +              # Check for failed password attempts.
 +              if ($line =~/.*sshd.*Failed password for (.*) from (.*) port.*/) {
 +                      # Store the grabbed IP-address.
 +                      $address = $2;
 +
 +                      # Set event message.
 +                      $message = "Possible SSH-Bruteforce Attack for user: $1.";
 +              }
 +
 +              # This should catch Bruteforce Attacks with enabled preauth
 +              elsif ($line =~ /.*sshd.*Received disconnect from (.*):.*\[preauth\]/) {
 +                      # Store obtained IP-address.
 +                      $address = $1;
 +
 +                      # Set event message.
 +                      $message = "Possible SSH-Bruteforce Attack - failed preauth.";
 +              }
 +
 +              # Check if at least the IP-address information has been extracted.
 +              if (defined ($address)) {
 +                      # Add the extracted values and event message for the computed
 +                      # event to the actions array.
 +                      push(@actions, "count $address $name $message");
 +              }
 +      }
 +
 +      # If any actions are required, return the array.
 +      if (@actions) {
 +              return (@actions);
 +      }
 +
 +      # If we got here, the provided message is not affected by any filter and
 +      # therefore can be skipped. Return nothing (False) in this case.
 +      return;
 +}
 +
 +#
 +## The HTTPD message parser.
 +#
 +## This subfunction is used for parsing and detecting different attacks
 +## against a running HTTPD service.
 +#
 +sub message_parser_httpd (@) {
 +      my @message = @_;
 +      my @actions;
 +
 +      # The name of the parser module.
 +      my $name = "HTTPD";
 +
 +      # Variable to store the grabbed IP-address.
 +      my $address;
 +
 +      # Variable to store the parsed event.
 +      my $message;
 +
 +      # Loop through all lines, in case multiple one have
 +      # been passed.
 +      foreach my $line (@message) {
 +              # This will catch brute-force attacks against htaccess logins (username).
 +              if ($line =~ /.*\[error\] \[client (.*)\] user(.*) not found:.*/) {
 +                      # Store the grabbed IP-address.
 +                      $address = $1;
 +
 +                      # Set event message.
 +                      $message = "Possible WUI brute-force attack, wrong user: $2.";
 +              }
 +
 +              # Detect htaccess password brute-forcing against a username.
 +              elsif ($line =~ /.*\[error\] \[client (.*)\] user(.*): authentication failure for.*/) {
 +                      # Store the extracted IP-address.
 +                      $address = $1;
 +
 +                      # Set event message.
 +                      $message = "Possible WUI brute-force attack, wrong password for user: $2.";
 +              }
 +
 +              # Check if at least the IP-address information has been extracted.
 +              if (defined ($address)) {
 +                      # Add the extracted values and event message to the actions array.
 +                      push(@actions, "count $address $name $message");
 +              }
 +      }
 +
 +      # If any actions are required, return the array.
 +      if (@actions) {
 +              return @actions;
 +      }
 +
 +      # If we got here, the provided message is not affected by any filter and
 +      # therefore can be skipped. Return nothing (False) in this case.
 +      return;
 +}
 +
  1;