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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