Dette stykke kode var oprindeligt en fuzzer til pop3 klienter, MUAs, men blev skrevet lidt om og brugt til serverdele af
Juli 2015 - POP3 attack
Jeg ved ikke om nogen kan bruge det, men hvis i kan, så værsågod:
#!/usr/bin/env ruby
######################################################
## Product: POPFuzz v0.9
## Description: POP3 Client fuzzer
## Filename: popfuzz.rb (Must be executable)
## Author: iTick
## Ruby 1.9.3 +
## Started: 2015
## Usage: ./popfuzz.rb &
## OS: Any that supports Ruby
######################################################
# Purpose: Fuzzing client POP3 software by giving overly long responses to client commands etc.
# Must run as root to be able to listen on port 1023 or below.
# RFC 1081 POPv3 - obsolete
# Software is free for all to use.
# Known Bugs: Lots
# - Does not handle unknown commands at all.
# - Errorhandling missing but not really needed.
# - Released files should have no file extension.
## Required modules
require 'socket'
## Constants
PORT = 110 # Port to listen on
BANNER = "+OK POPFuzz v0.9 Server Ready (Shellsec.pw challenge)"
LISTEN_IP = "0.0.0.0" # Listen on INADDR_ANY
USERNAME ="postmaster" # Account for the client to use
PASSWORD = "Password1" # Password for the client to use
DOMAIN = "@shellsec.pw" # Domain to be presented in tne static email.
# Freeze constants. (SHould be done directly on the receiver, but it seems to not work in older versions of Ruby)
PORT.freeze
BANNER.freeze
LISTEN_IP.freeze
USERNAME.freeze
PASSWORD.freeze
DOMAIN.freeze
## Globals
$num_messages = 1 # Number of messagens the server holds. Only one static is currently in place.
# *** Message 1 beginning ***
$msg1 = <<-END_OF_STRING
Return-Path: <no-reply@example.com>
Delivered-To: #{USERNAME}#{DOMAIN}
Received: from localhost (unknown [10.1.3.25])
by harmony.local (Postfix) with ESMTP id 2CC88637E2
for <#{USERNAME}#{DOMAIN}>; Wed, 13 May 2015 10:02:52 +0200 (CEST)
To: #{USERNAME}#{DOMAIN}
Subject: Hello
Message-ID: <0c4488f96a9385eed5de73fdfc366445@example.com>
Date: Wed, 13 May 2015 04:17:57 +0000
From: "Administrator" <no-reply@example.com>
Reply-To: no-reply@example.com
MIME-Version: 1.0
Content-Type: multipart/alternative; charset="UTF-8"; boundary="b1_5ecf0dd9b89ef5875fcc3e3ead24e962"
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; format=flowed; charset="UTF-8"
Content-Transfer-Encoding: 8bit
--b1_5ecf0dd9b89ef5875fcc3e3ead24e962
Content-Type: text/plain; format=flowed; charset="UTF-8"
Content-Transfer-Encoding: 8bit
Hey
The secret word is Hello.
--b1_5ecf0dd9b89ef5875fcc3e3ead24e962
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: 8bit
<html><head></head><body>
Hey<br />
The secret word is Hello.
</body></html>
--b1_5ecf0dd9b89ef5875fcc3e3ead24e962--
END_OF_STRING
# *** Message 1 ending ***
## Main
socket = TCPServer.new(LISTEN_IP, PORT) # Create a server socket (for listening)
# Main loop
loop do # Keep listening
Thread.start(socket.accept) do |client| # Handle accept() and spawn a thread for each client connection.
client.puts BANNER # Send banner to client according to RFC
_state = "AUTHORIZATION" # Keep track of POP3 states
_username = "" # This is to verify that the USER is set before accepting PASS
# AUTHORIZATION state
while _state == "AUTHORIZATION"
_message = client.gets # Read command from client
_command = "" # Initialize command variable to ""
_argument = "" # Initialize command argument to ""
_command, _argument = _message.chomp.split(/ /) # Remove CR and LF if present and split the message into a command and an argument variable.
# USER
if _command == "USER" and _state != "AUTHORIZATION" # USER command while not i AUTHORIZATION state. This should not happen.
client.puts "-ERR You should not do this now"
elsif _command == "USER" and !_argument and _state == "AUTHORIZATION" # USER was not followed by a username. State is correct.
client.puts "-ERR missing username"
elsif _command == "USER" and _argument == USERNAME and _state == "AUTHORIZATION" # USER command matches an account. State is correct
_username = _argument
client.puts "+OK #{_username} is hanging out here"
elsif _command == "USER" and _argument != USERNAME and _state == "AUTHORIZATION" # User command did not match requested account. State is correct.
client.puts "-ERR #{_argument} does not hang out here"
end
# PASS
if _command == "PASS" and _state != "AUTHORIZATION" # PASS command given while not in AUTHORIZATION state. This should not happen.
client.puts "-ERR You should not do this now"
elsif _command == "PASS" and _username != USERNAME and _state == "AUTHORIZATION" # PASS called before USER. State is correct.
client.puts "-ERR You should do USER first"
elsif _command == "PASS" and !_argument and _state == "AUTHORIZATION" # PASS was not followed by a password. State is correct.
client.puts "-ERR Passowrd missing"
elsif _command == "PASS" and _argument != PASSWORD and _username == USERNAME and _state == "AUTHORIZATION" # Password was not correct. State is correct.
client.puts "-ERR Passowrd incorrect for that user"
elsif _command =="PASS" and _argument == PASSWORD and _state == "AUTHORIZATION" # PASS matches. State is correct
client.puts "+OK #{_username} is now authorized"
_state = "TRANSACTION" # Authorization complete. Change state according to RFC. This will end current loop that handle the AUTHORIZATION state.
end
# QUIT
if _command == "QUIT"
client.puts "+OK leaving"
_state = "ENDING"
end
# AUTH FIXME: Not implemented
if _command == "AUTH"
client.puts "-ERR What are you doing?"
end
# CAPA FIXME: Not implemented
if _command == "CAPA"
client.puts "-ERR What are you doint?"
end
end
# TRANSACTION State
while _state == "TRANSACTION"
_message = client.gets # Read command from client
_command, _argument = _message.chomp.split(/ /) # Remove newlines ans split the message using space as a seperator
# STAT
if _command == "STAT" and _state != "TRANSACTION" # STAT given in wrong state. This should not happen.
client.puts "-ERR You should not do that now"
elsif _command == "STAT" and _state == "TRANSACTION" # STAT is given. State is correct.
client.puts "+OK #{$num_messages} #{$msg1.size}"
end
# LIST
if _command == "LIST" and _state != "TRANSACTION" # LIST is given in wrong state. This should not happen.
client.puts "-ERR You should not do this now"
elsif _command == "LIST" and !_argument and _state == "TRANSACTION" # LIST is given with no arguments. This is OK.
client.puts "+OK #{$num_messages} messages (#{$msg1.size} octets)" # This should not be done this way. Make sure to calculate size of all messages in total if more than one exists.
client.puts "1 #{$msg1.size}"
client.puts "."
elsif _command == "LIST" and _argument == "1" and _state == "TRANSACTION"
client.puts "+OK #{_argument} #{$msg1.size}"
end
# RETR
if _command == "RETR" and _state != "TRANSACTION"
client.puts "-ERR You should not do this now"
elsif _command == "RETR" and !_argument and _state == "TRANSACTION"
client.puts "-ERR Message number missing"
elsif _command == "RETR" and _argument == "1" and _state == "TRANSACTION"
client.puts "+OK #{$msg1.size} octets"
client.puts $msg1
client.puts "."
end
# DELE (This does not actually delete the message, but returns a appropriate reply)
if _command == "DELE" and _state != "TRANSACTION"
client.puts "-ERR You should not do this now"
elsif _command == "DELE" and !_argument and _state == "TRANSACTION"
client.puts "-ERR no such message"
elsif _command == "DELE" and _argument == "1" and _state == "TRANSACTION"
client.puts "+OK message 1 deleted"
end
# NOOP
if _command == "NOOP" and _state != "TRANSACTION"
client.puts "-ERR You should not do this now"
elsif _command == "NOOP" and _state == "TRANSACTION"
client.puts "+OK"
end
# LAST FIXME: Not implemented
if _command == "LAST" and _state != "TRANSACTION"
client.puts "-ERR You should not do that now"
elsif _command == "LAST" and _state == "TRANSACTION"
client.puts "+OK 1"
end
# RSET
if _command == "RSET" and _state != "TRANSACTION"
client.puts "-ERR You should not do this now"
elsif _command == "RSET" and _state == "TRANSACTION"
client.puts "+OK maildrop has #{$num_messages} messages (#{$msg1.size} octets)"
end
# UIDL FIXME: Not implemented
if _command == "UIDL"
client.puts "-ERR not supported"
end
# XTND FIXME: Not implemented
if _command == "XTND"
client.puts "-ERR not supported"
end
# TOP FIXME: Not implemented
if _command == "TOP"
client.puts "-ERR not supported"
end
# QUIT
if _command == "QUIT"
client.puts "+OK leaving"
_state = "ENDING"
end
end # while
# ENDING state (and all other states not handled - if any)
client.close # Close the client socket
end # End the thread that handle the current client
end # Mail loop end
socket.close # Close the server socket. This should never happen. Use CTRL+C to stop the server.
Og ja, koden og det hemmelige ord til udfordringen er ændret. ;)
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