local http = require("http")
local shortport = require("shortport")
local stdnse = require("stdnse")
local strbuf = require("strbuf")
local string = require("string")
local table = require("table")
description = [[
Checks for a Git repository found in a website's document root
/.git/<something>) and retrieves as much repo information as
possible, including language/framework, remotes, last commit
message, and repository description.
]]
---
-- @output
-- PORT STATE SERVICE REASON
-- 80/tcp open http syn-ack
-- | http-git:
-- | 127.0.0.1:80/.git/
-- | Git repository found!
-- | .git/config matched patterns 'passw'
-- | Repository description: Unnamed repository; edit this file 'description' to name the...
-- | Remotes:
-- | http://github.com/someuser/somerepo
-- | Project type: Ruby on Rails web application (guessed from .git/info/exclude)
-- | 127.0.0.1:80/damagedrepository/.git/
-- |_ Potential Git repository found (found 2/6 expected files)
--
-- @xmloutput
-- <table key="127.0.0.1:80/.git/">
-- <table key="remotes">
-- <elem>http://github.com/anotherperson/anotherepo</elem>
-- </table>
-- <table key="project-type">
-- <table key=".git/info/exclude">
-- <elem>JBoss Java web application</elem>
-- <elem>Java application</elem>
-- </table>
-- </table>
-- <elem key="repository-description">A nice repository</elem>
-- <table key="files-found">
-- <elem key=".git/COMMIT_EDITMSG">false</elem>
-- <elem key=".git/info/exclude">true</elem>
-- <elem key=".git/config">true</elem>
-- <elem key=".git/description">true</elem>
-- <elem key=".gitignore">false</elem>
-- </table>
-- <table key="interesting-matches">
-- <table key=".git/config">
-- <elem>passw</elem>
-- </table>
-- </table>
-- </table>
categories = { "default", "safe", "vuln" }
author = "Alex Weber"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
portrule = shortport.http
-- We consider 200 to mean "okay, file exists and we received its contents".
local STATUS_OK = 200
-- Long strings (like a repository's description) will be truncated to this
-- number of characters in normal output.
local TRUNC_LENGTH = 60
function action(host, port)
local out
-- We can accept a single root, or a table of roots to try
local root_arg = stdnse.get_script_args("http-git.root")
local roots
if type(root_arg) == "table" then
roots = root_arg
elseif type(root_arg) == "string" or type(root_arg) == "number" then
roots = { tostring(root_arg) }
elseif root_arg == nil then -- if we didn't get an argument
roots = { "/" }
end
-- Try each root in succession
for _, root in ipairs(roots) do
root = tostring(root)
root = root or '/'
-- Put a forward slash on the beginning and end of the root, if none was
-- provided. We will print this, so the user will know that we've mangled it
if not string.find(root, "/$") then -- if there is no slash at the end
root = root .. "/"
end
if not string.find(root, "^/") then -- if there is no slash at the beginning
root = "/" .. root
end
-- If we can't get a valid /.git/HEAD, don't even bother continuing
-- We could try for /.git/, but we will not get a 200 if directory
-- listings are disallowed.
local resp = http.get(host, port, root .. ".git/HEAD")
local sha1_pattern = "^%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x"
if resp.status == STATUS_OK and ( resp.body:match("^ref: ") or resp.body:match(sha1_pattern) ) then
out = out or {}
local replies = {}
-- This function returns true if we got a 200 OK when
-- fetching 'filename' from the server
local function ok(filename)
return (replies[filename].status == STATUS_OK)
end
-- These are files that are small, very common, and don't
-- require zlib to read
-- These files are created by creating and using the repository,
-- or by popular development frameworks.
local repo = {
".gitignore",
".git/COMMIT_EDITMSG",
".git/config",
".git/description",
".git/info/exclude",
}
local pl_requests = {} -- pl_requests = pipelined requests (temp)
-- Go through all of the filenames and do an HTTP GET
for _, name in ipairs(repo) do -- for every filename
http.pipeline_add(root .. name, nil, pl_requests)
end
-- Do the requests.
replies = http.pipeline_go(host, port, pl_requests)
if replies == nil then
stdnse.print_debug("%s: pipeline_go() error. Aborting.", SCRIPT_NAME)
return nil
end
for i, reply in ipairs(replies) do
-- We want this to be indexed by filename, not an integer, so we convert it
-- We added to the pipeline in the same order as the filenames, so this is safe.
replies[repo[i]] = reply -- create index by filename
replies[i] = nil -- delete integer-indexed entry
end
-- Mark each file that we tried to get as 'found' (true) or 'not found' (false).
local location = host.ip .. ":" .. port.number .. root .. ".git/"
out[location] = {}
-- A nice shortcut
local loc = out[location]
loc["files-found"] = {}
for name, _ in pairs(replies) do
loc["files-found"][name] = ok(name)
end
-- Look through all the repo files we grabbed and see if we can find anything interesting.
local interesting = { "bug", "key", "passw", "pw", "user", "secret", "uid" }
for name, reply in pairs(replies) do
if ok(name) then
for _, pattern in ipairs(interesting) do
if string.match(reply.body, pattern) then
-- A Lua idiom - don't create this table until we actually have something to put in it
loc["interesting-matches"] = loc["interesting-matches"] or {}
loc["interesting-matches"][name] = loc["interesting-matches"][name] or {}
table.insert(loc["interesting-matches"][name], pattern)
end
end
end
end
if ok(".git/COMMIT_EDITMSG") then
loc["last-commit-message"] = replies[".git/COMMIT_EDITMSG"].body
end
if ok(".git/description") then
loc["repository-description"] = replies[".git/description"].body
end
-- .git/config contains a list of remotes, so we try to extract them.
if ok(".git/config") then
local config = replies[".git/config"].body
local remotes = {}
-- Try to extract URLs of all remotes.
for url in string.gmatch(config, "\n%s*url%s*=%s*(%S*/%S*)") do
table.insert(remotes, url)
end
for _, url in ipairs(remotes) do
loc["remotes"] = loc["remotes"] or {}
table.insert(loc["remotes"], url)
end
end
-- These are files that are used by Git to determine what files to ignore.
-- We use this list to make the loop below (used to determine what kind of
-- application is in the repository) more generic.
local ignorefiles = {
".gitignore",
".git/info/exclude",
}
local fingerprints = {
-- Many of these taken from https://github.com/github/gitignore
{ "%.scala_dependencies", "Scala application" },
{ "npm%-debug%.log", "node.js application" },
{ "joomla%.xml", "Joomla! site" },
{ "jboss/server", "JBoss Java web application" },
{ "wp%-%*%.php", "WordPress site" },
{ "app/config/database%.php", "CakePHP web application" },
{ "sites/default/settings%.php", "Drupal site" },
{ "local_settings%.py", "Django web application" },
{ "/%.bundle", "Ruby on Rails web application" }, -- More specific matches (MyFaces > JSF > Java) on top
{ "%.py[dco]", "Python application" },
{ "%.jsp", "JSP web application" },
{ "%.bundle", "Ruby application" },
{ "%.class", "Java application" },
{ "%.php", "PHP application" },
}
-- The XML produced here is divided by ignorefile and is sorted from first to last
-- in order of specificity. e.g. All JBoss applications are Java applications,
-- but not all Java applications are JBoss. In that case, JBoss and Java will
-- be output, but JBoss will be listed first.
for _, file in ipairs(ignorefiles) do
if ok(file) then -- We only test all fingerprints if we got the file.
for _, fingerprint in ipairs(fingerprints) do
if string.match(replies[file].body, fingerprint[1]) then
loc["project-type"] = loc["project-type"] or {}
loc["project-type"][file] = loc["project-type"][file] or {}
table.insert(loc["project-type"][file], fingerprint[2])
end
end
end
end
end
end
-- If we didn't get anything, we return early. No point doing the
-- normal formatting!
if out == nil then
return nil
end
-- Truncate to TRUNC_LENGTH characters and replace control characters (newlines, etc) with spaces.
local function summarize(str)
str = stdnse.string_or_blank(str, "<unknown>")
local original_length = #str
str = string.sub(str, 1, TRUNC_LENGTH)
str = string.gsub(str, "%c", " ")
if original_length > TRUNC_LENGTH then
str = str .. "..."
end
return str
end
-- We convert the full output to pretty output for -oN
local normalout
for location, info in pairs(out) do
normalout = normalout or {}
-- This table gets converted to a string format_output, and then inserted into the 'normalout' table
local new = {}
-- Headings for each place we found a repo
new["name"] = location
-- How sure are we that this is a Git repository?
local count = { tried = 0, ok = 0 }
for _, found in pairs(info["files-found"]) do
count.tried = count.tried + 1
if found then count.ok = count.ok + 1 end
end
-- If 3 or more of the files we were looking for are not on the server,
-- we are less confident that we got a real Git repository
if count.tried - count.ok <= 2 then
table.insert(new, "Git repository found!")
else -- We already got .git/HEAD, so we add 1 to 'tried' and 'ok'
table.insert(new, "Potential Git repository found (found " .. (count.ok + 1) .. "/" .. (count.tried + 1) .. " expected files)")
end
-- Show what patterns matched what files
for name, matches in pairs(info["interesting-matches"] or {}) do
local temp = name .. " matched patterns"
for _, matched in ipairs(matches) do
temp = temp .. " '" .. matched .. "'"
end
table.insert(new, temp)
end
if info["repository-description"] then
table.insert(new, "Repository description: " .. summarize(info["repository-description"]))
end
if info["last-commit-message"] then
table.insert(new, "Last commit message: " .. summarize(info["last-commit-message"]))
end
-- If we found any remotes in .git/config, process them now
if info["remotes"] then
local old_name = info["remotes"]["name"] -- in case 'name' is a remote
info["remotes"]["name"] = "Remotes:"
-- Remove the newline from format_output's output - it looks funny with it
local temp = string.gsub(stdnse.format_output(true, info["remotes"]), "^\n", "")
-- using 'temp' here because gsub() has multiple return values that insert() will try
-- to use, and I don't know of a better way to prevent that ;)
table.insert(new, temp)
info["remotes"]["name"] = old_name
end
-- Take the first guessed project type from each ignorefile
if info["project-type"] then
for name, types in pairs(info["project-type"]) do
table.insert(new, "Project type: " .. types[1] .. " (guessed from " .. name .. ")")
end
end
-- Insert this location's information.
table.insert(normalout, new)
end
return out, stdnse.format_output(true, normalout)
end
@KyuuKazami