added pop3.lua

nselib/pop3.lua

@@ -0,0 +1,185 @@
+--- POP3 functions
+--@copyright See nmaps COPYING for licence
+
+module(...,package.seeall)
+
+require 'base64'
+require 'bit'
+
+
+err = {
+   none = 0,
+   userError = 1,
+   pwError = 2,
+   informationMissing = 3
+}
+
+
+function stat(line)
+   return string.match(line, "+OK")
+end
+
+
+
+
+function login_user(socket, user, pw)
+   socket:send("USER " .. user .. "\r\n")
+   status, line = socket:receive_lines(1)
+   if not stat(line) then return false, err.user_error end
+   print("my way")
+   socket:send("PASS " .. pw .. "\r\n")
+      
+   status, line = socket:receive_lines(1)
+      
+   if stat(line) then return true, err.none 
+   else return false, err.pwError
+   end
+end
+
+
+function login_sasl_plain(socket, user, pw)
+   
+   local auth64 = base64.enc(user .. "\0" .. user .. "\0" .. pw)
+   socket:send("AUTH PLAIN " .. auth64 .. "\r\n")
+   
+   status, line = socket:receive_lines(1)
+   
+   if stat(line) then 
+      return true, err.none
+   else 
+      return false, err.pwError
+   end
+end
+
+function login_sasl_login(socket, user, pw)
+
+   local user64 = base64.enc(user)
+   
+   local pw64 = base64.enc(pw)
+
+   socket:send("AUTH LOGIN\r\n")
+      
+   status, line = socket:receive_lines(1)
+   if not base64.dec(string.sub(line, 3)) == "User Name:" then 
+      return false, err.userError 
+   end
+
+   socket:send(user64)
+      
+   status, line = socket:receive_lines(1)
+
+   if not base64.dec(string.sub(line, 3)) == "Password:" then 
+      return false, err.userError
+   end
+
+   socket:send(pw64)
+      
+   status, line = socket:receive_lines(1)
+    
+   if stat(line) then
+      return true, err.none
+   else
+      return false, err.pwError
+   end
+end
+
+
+function login_apop(socket, user, pw, challenge)
+   if type(challenge) ~= "string" then return false, err.informationMissing end
+
+   local apStr = hash.md5(challenge .. pw)
+   socket:send("APOP " .. user .. " " .. apStr .. "\r\n")
+      
+   status, line = socket:receive_lines(1)
+   
+   if (stat(line)) then 
+      return true, err.none
+   else
+      return false, err.pwError
+   end
+end
+
+function capabilities(host, port)
+   local socket = nmap.new_socket()
+   local capas = {}
+   if not socket:connect(host.ip, port.number) then return "no conn" end
+   
+   status, line = socket:receive_lines(1)
+   if not stat(line) then return "no popconn" end
+   
+   if string.find(line, "<[%p%w]+>") then capas.APOP = true end
+   
+   socket:send("CAPA\r\n")
+   status, line = socket:receive_buf("\r\n", false)
+   -- print("resp " .. line)
+   if not stat(line) then 
+      capas.capa = false
+   else 
+      status, line = socket:receive_buf("\r\n", false)
+      while line do
+	 if line ~= "." then
+	    local capability = string.sub(line, string.find(line, "[%w-]+"))
+	    line = string.sub(line, #capability + 1)
+	    capas[capability] = true
+	    local args = {}
+	    local w
+	    for w in string.gmatch(line, "[%w-]+") do
+	       table.insert(args, w)
+	    end
+	    if #args == 1 then capas[capability] = args[1]
+	    else if #args > 1 then capas[capability] = args 
+	    end end
+	 else
+	    break 
+	 end
+	 status, line = socket:receive_buf("\r\n", false)
+      end
+   end
+   socket:close()
+   return capas
+end
+
+
+function hmacMD5(key, msg)
+   local ipad = {}
+   local opad = {}
+
+   if (string.len(key) > 64) then
+      key = hash.md5binary(key)
+   end
+
+   -- create both pads, XORing with key
+   for i = 1, string.len(key) do
+      ipad[i] = string.char(bit.bxor(0x36, string.byte(string.sub(key, i))))
+      opad[i] = string.char(bit.bxor(0x5c, string.byte(string.sub(key, i))))
+   end
+   for i = #ipad + 1, 64 do
+      ipad[i] = string.char(0x36)
+      opad[i] = string.char(0x5c)
+   end
+
+   -- calc HMAC-md5
+   return hash.md5(table.concat(opad) .. hash.md5bin(table.concat(ipad) .. msg))
+end
+
+
+function login_sasl_crammd5(socket, user, pw)
+
+   socket:send("AUTH CRAM-MD5\r\n")
+   
+   status, line = socket:receive_lines(1)
+   
+   local challenge = base64.dec(string.sub(line, 3))
+
+   local digest = hmacMD5(pw, challenge)
+   local authStr = base64.enc(user .. " " .. digest)
+   socket:send(authStr .. "\r\n")
+      
+   status, line = socket:receive_lines(1)
+   
+   if stat(line) then 
+      return true, err.none
+   else 
+      return false, err.pwError
+   end
+end