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Current File : //usr/share/nmap/scripts/http-auth.nse
description = [[
Retrieves the authentication scheme and realm of a web service that requires
authentication.
]]

---
-- @output
-- PORT   STATE SERVICE REASON
-- 80/tcp open  http    syn-ack
-- | http-auth: HTTP/1.1 401 Unauthorized
-- | Basic realm=WebAdmin
-- |_HTTP server may accept admin:admin combination for Basic authentication.

-- HTTP authentication information gathering script
-- rev 1.1 (2007-05-25)
-- 2008-11-06 Vlatko Kosturjak <kost@linux.hr>
-- * bug fixes against base64 encoded strings, more flexible auth/pass check,
--   corrected sample output

author = "Thomas Buchanan"

license = "Same as Nmap--See http://nmap.org/book/man-legal.html"

categories = {"default", "auth", "intrusive"}

require "shortport"
require "http"

portrule = shortport.http

action = function(host, port)
  local www_authenticate
  local challenges, basic_challenge
  local authcombinations= {
    { username = "admin", password = ""},
    { username = "admin", password = "admin"},
  }

  local result = {}
  local answer = http.get(host, port, "/")

  --- check for 401 response code
  if answer.status ~= 401 then
    return
  end

  result[#result + 1] = answer["status-line"]

  www_authenticate = answer.header["www-authenticate"]
  if not www_authenticate then
    result[#result + 1] = string.format("Server returned status %d but no WWW-Authenticate header.", answer.status)
    return table.concat(result, "\n")
  end
  challenges = http.parse_www_authenticate(www_authenticate)
  if not challenges then
    result[#result + 1] = string.format("Server returned status %d but the WWW-Authenticate header could not be parsed.", answer.status)
    result[#result + 1] = string.format("WWW-Authenticate: %s", www_authenticate)
    return table.concat(result, "\n")
  end

  basic_challenge = nil
  for _, challenge in ipairs(challenges) do
    if challenge.scheme == "Basic" then
      basic_challenge = challenge
    end
    local line = challenge.scheme
    for name, value in pairs(challenge.params) do
      line = line .. string.format(" %s=%s", name, value)
    end
    result[#result + 1] = line
  end
  if basic_challenge then
    for _, auth in ipairs(authcombinations) do 
      answer = http.get(host, port, '/', {auth = auth})
      if answer.status ~= 401 and answer.status ~= 403 then
        result[#result + 1] = string.format("HTTP server may accept %s:%s combination for Basic authentication.", auth.username, auth.password)
      end
    end
  end

  return table.concat(result, "\n")
end
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