mirror of
https://gitgud.io/fatchan/haproxy-protection.git
synced 2025-05-09 02:05:37 +00:00
322 lines
12 KiB
Lua
322 lines
12 KiB
Lua
_M = {}
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local url = require("url")
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local utils = require("utils")
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local cookie = require("cookie")
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local json = require("json")
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local sha = require("sha")
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local randbytes = require("randbytes")
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--require("print_r")
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local captcha_secret = os.getenv("HCAPTCHA_SECRET") or os.getenv("RECAPTCHA_SECRET")
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local captcha_sitekey = os.getenv("HCAPTCHA_SITEKEY") or os.getenv("RECAPTCHA_SITEKEY")
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local captcha_cookie_secret = os.getenv("CAPTCHA_COOKIE_SECRET")
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local pow_cookie_secret = os.getenv("POW_COOKIE_SECRET")
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local hmac_cookie_secret = os.getenv("HMAC_COOKIE_SECRET")
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local ray_id = os.getenv("RAY_ID")
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local captcha_map = Map.new("/etc/haproxy/ddos.map", Map._str);
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local captcha_provider_domain = ""
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local captcha_classname = ""
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local captcha_script_src = ""
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local captcha_siteverify_path = ""
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local captcha_backend_name = ""
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if os.getenv("HCAPTCHA_SITEKEY") then
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captcha_provider_domain = "hcaptcha.com"
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captcha_classname = "h-captcha"
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captcha_script_src = "https://hcaptcha.com/1/api.js"
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captcha_siteverify_path = "/siteverify"
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captcha_backend_name = "hcaptcha"
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else
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captcha_provider_domain = "www.google.com"
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captcha_classname = "g-recaptcha"
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captcha_script_src = "https://www.google.com/recaptcha/api.js"
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captcha_siteverify_path = "/recaptcha/api/siteverify"
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captcha_backend_name = "recaptcha"
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end
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function _M.setup_servers()
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local backend_name = os.getenv("BACKEND_NAME")
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local server_prefix = os.getenv("SERVER_PREFIX")
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if backend_name == nil or server_prefix == nil then
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return;
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end
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local hosts_map = Map.new("/etc/haproxy/hosts.map", Map._str);
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local handle = io.open("/etc/haproxy/hosts.map", "r")
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local line = handle:read("*line")
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local counter = 1
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while line do
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local domain, backend_host = line:match("([^%s]+)%s+([^%s]+)")
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local port_index = backend_host:match'^.*():'
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local backend_hostname = backend_host:sub(0, port_index-1)
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local backend_port = backend_host:sub(port_index + 1)
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core.set_map("/etc/haproxy/backends.map", domain, server_prefix..counter)
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local proxy = core.proxies[backend_name].servers[server_prefix..counter]
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proxy:set_addr(backend_hostname, backend_port)
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proxy:set_ready()
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line = handle:read("*line")
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counter = counter + 1
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end
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handle:close()
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end
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-- main page template
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local body_template = [[
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<!DOCTYPE html>
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<html>
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<head>
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<meta name='viewport' content='width=device-width initial-scale=1'>
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<title>Hold on...</title>
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<style>
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:root{--text-color:#c5c8c6;--bg-color:#1d1f21}
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@media (prefers-color-scheme:light){:root{--text-color:#333;--bg-color:#EEE}}
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.h-captcha,.g-recaptcha{min-height:85px;display:block}
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.red{color:red;font-weight:bold}
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a,a:visited{color:var(--text-color)}
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body,html{height:100%%}
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body{display:flex;flex-direction:column;background-color:var(--bg-color);color:var(--text-color);font-family:Helvetica,Arial,sans-serif;max-width:1200px;margin:0 auto;padding: 0 20px}
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details{transition: border-left-color 0.5s;max-width:1200px;text-align:left;border-left: 2px solid var(--text-color);padding:10px}
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code{background-color:#dfdfdf30;border-radius:3px;padding:0 3px;}
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img,h3,p{margin:0 0 5px 0}
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footer{font-size:x-small;margin-top:auto;margin-bottom:20px;text-align:center}
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img{display:inline}
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.pt{padding-top:15vh;display:flex;align-items: center}
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.pt img{margin-right:10px}
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details[open]{border-left-color: #1400ff}
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.lds-ring{display:inline-block;position:relative;width:80px;height:80px}.lds-ring div{box-sizing:border-box;display:block;position:absolute;width:32px;height:32px;margin:10px;border:5px solid var(--text-color);border-radius:50%%;animation:lds-ring 1.2s cubic-bezier(0.5, 0, 0.5, 1) infinite;border-color:var(--text-color) transparent transparent transparent}.lds-ring div:nth-child(1){animation-delay:-0.45s}.lds-ring div:nth-child(2){animation-delay:-0.3s}.lds-ring div:nth-child(3){animation-delay:-0.15s}@keyframes lds-ring{0%%{transform:rotate(0deg)}100%%{transform:rotate(360deg)}}
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</style>
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<noscript>
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<style>.jsonly{display:none}</style>
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</noscript>
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</head>
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<body data-pow="%s">
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%s
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%s
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%s
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<noscript>
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<br>
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<p class="red">JavaScript is required on this page.</p>
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%s
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</noscript>
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<footer>
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<img src="/img/footerlogo.png" />
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<p>Security and Performance by <a href="https://BasedFlare.com">BasedFlare</a></p>
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<p>Node: <code>%s</code></p>
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</footer>
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<script src="/js/challenge.js"></script>
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</body>
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</html>
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]]
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local noscript_extra_template = [[
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<details>
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<summary>No JavaScript?</summary>
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<ol>
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<li>
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<p>Run this in a linux terminal:</p>
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<code style="word-break: break-all;">
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echo "Q0g9IiQyIjtCPSIwMDQxIjtJPTA7RElGRj0kKCgxNiMke0NIOjA6MX0gKiAyKSk7d2hpbGUgdHJ1ZTsgZG8gSD0kKGVjaG8gLW4gJENIJEkgfCBzaGEyNTZzdW0pO0U9JHtIOiRESUZGOjR9O1tbICRFID09ICRCIF1dICYmIGVjaG8gJDEjJDIjJDMjJEkgJiYgZXhpdCAwOygoSSsrKSk7ZG9uZTs=" | base64 -d | bash -s %s %s %s
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</code>
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<li>Set a cookie named <code>z_ddos_pow</code> with the value as the script output, and path <code>/</code>.
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<li>Remove <code>/bot-check?</code> from the url, and reload the page.
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</ol>
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</details>
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]]
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-- title with favicon and hostname
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local site_name_section_template = [[
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<h3 class="pt">
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<img src="/favicon.ico" width="32" height="32">
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%s
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</h3>
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]]
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-- spinner animation for proof of work
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local pow_section_template = [[
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<h3>
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Checking your browser for robots 🤖
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</h3>
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<div class="jsonly">
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<div class="lds-ring"><div></div><div></div><div></div><div></div></div>
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</div>
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]]
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-- message, captcha form and submit button
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local captcha_section_template = [[
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<h3>
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Please solve the captcha to continue.
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</h3>
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<form class="jsonly" method="POST">
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<div class="%s" data-sitekey="%s"></div>
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<script src="%s" async defer></script>
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<input type="submit" value="Calculating proof of work..." disabled>
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</form>
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]]
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function _M.view(applet)
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local response_body = ""
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local response_status_code
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if applet.method == "GET" then
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-- get the user_key#challenge#sig
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local user_key = sha.bin_to_hex(randbytes(16))
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local challenge_hash = utils.generate_secret(applet, pow_cookie_secret, user_key, true)
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local signature = sha.hmac(sha.sha256, hmac_cookie_secret, user_key .. challenge_hash)
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local combined_challenge = user_key .. "#" .. challenge_hash .. "#" .. signature
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-- print_r(user_key)
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-- print_r(challenge_hash)
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-- print_r(signature)
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-- print_r(combined_challenge)
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-- define body sections
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local site_name_body = ""
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local captcha_body = ""
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local pow_body = ""
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local noscript_extra_body = ""
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-- check if captcha is enabled, path+domain priority, then just domain, and 0 otherwise
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local captcha_enabled = false
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local host = applet.headers['host'][0]
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local path = applet.qs; --because on /bot-check?/whatever, .qs (query string) holds the "path"
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local captcha_map_lookup = captcha_map:lookup(host..path) or captcha_map:lookup(host) or 0
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captcha_map_lookup = tonumber(captcha_map_lookup)
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if captcha_map_lookup == 2 then
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captcha_enabled = true
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end
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-- pow at least is always enabled when reaching bot-check page
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site_name_body = string.format(site_name_section_template, host)
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if captcha_enabled then
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captcha_body = string.format(captcha_section_template, captcha_classname, captcha_sitekey, captcha_script_src)
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else
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pow_body = pow_section_template
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noscript_extra_body = string.format(noscript_extra_template, user_key, challenge_hash, signature)
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end
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-- sub in the body sections
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response_body = string.format(body_template, combined_challenge, site_name_body, pow_body, captcha_body, noscript_extra_body, ray_id)
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response_status_code = 403
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elseif applet.method == "POST" then
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local parsed_body = url.parseQuery(applet.receive(applet))
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local user_captcha_response = parsed_body["h-captcha-response"] or parsed_body["g-recaptcha-response"]
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if user_captcha_response then
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local captcha_url = string.format(
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"https://%s%s",
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core.backends[captcha_backend_name].servers[captcha_backend_name]:get_addr(),
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captcha_siteverify_path
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)
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local captcha_body = url.buildQuery({
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secret=captcha_secret,
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response=user_captcha_response
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})
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local httpclient = core.httpclient()
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local res = httpclient:post{
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url=captcha_url,
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body=captcha_body,
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headers={
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[ "host" ] = { captcha_provider_domain },
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[ "content-type" ] = { "application/x-www-form-urlencoded" }
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}
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}
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local status, api_response = pcall(json.decode, res.body)
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if not status then
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api_response = {}
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end
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if api_response.success == true then
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-- for captcha, they dont need to solve a POW but we check the user_hash and sig later
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local user_key = sha.bin_to_hex(randbytes(16))
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local user_hash = utils.generate_secret(applet, captcha_cookie_secret, user_key, true)
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local signature = sha.hmac(sha.sha256, hmac_cookie_secret, user_key .. user_hash)
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local combined_cookie = user_key .. "#" .. user_hash .. "#" .. signature
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applet:add_header(
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"set-cookie",
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string.format("z_ddos_captcha=%s; expires=Thu, 31-Dec-37 23:55:55 GMT; Path=/; SameSite=Strict; Secure=true;", combined_cookie)
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)
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end
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end
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-- if failed captcha, will just get sent back here so 302 is fine
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response_status_code = 302
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applet:add_header("location", applet.qs)
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else
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-- other methods
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response_status_code = 403
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end
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applet:set_status(response_status_code)
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applet:add_header("content-type", "text/html; charset=utf-8")
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applet:add_header("content-length", string.len(response_body))
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applet:start_response()
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applet:send(response_body)
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end
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-- check if captcha is enabled, path+domain priority, then just domain, and 0 otherwise
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function _M.decide_checks_necessary(txn)
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local host = txn.sf:hdr("Host")
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local path = txn.sf:path();
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local captcha_map_lookup = captcha_map:lookup(host..path) or captcha_map:lookup(host) or 0
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captcha_map_lookup = tonumber(captcha_map_lookup)
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if captcha_map_lookup == 1 then
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txn:set_var("txn.validate_pow", true)
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elseif captcha_map_lookup == 2 then
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txn:set_var("txn.validate_captcha", true)
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txn:set_var("txn.validate_pow", true)
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end
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-- otherwise, domain+path was set to 0 (whitelist) or there is no entry in the map
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end
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-- check if captcha cookie is valid, separate secret from POW
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function _M.check_captcha_status(txn)
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local parsed_request_cookies = cookie.get_cookie_table(txn.sf:hdr("Cookie"))
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local received_captcha_cookie = parsed_request_cookies["z_ddos_captcha"] or ""
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local split_cookie = utils.split(received_captcha_cookie, "#")
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if #split_cookie ~= 3 then
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return
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end
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local given_user_key = split_cookie[1]
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local given_user_hash = split_cookie[2]
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local given_signature = split_cookie[3]
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-- regenerate the user hash and compare it
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local generated_user_hash = utils.generate_secret(txn, captcha_cookie_secret, given_user_key, false)
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if generated_user_hash ~= given_user_hash then
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return
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end
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-- regenerate the signature and compare it
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local generated_signature = sha.hmac(sha.sha256, hmac_cookie_secret, given_user_key .. given_user_hash)
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if given_signature == generated_signature then
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return txn:set_var("txn.captcha_passed", true)
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end
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end
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-- check if pow cookie is valid
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function _M.check_pow_status(txn)
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local parsed_request_cookies = cookie.get_cookie_table(txn.sf:hdr("Cookie"))
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local received_pow_cookie = parsed_request_cookies["z_ddos_pow"] or ""
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-- split the cookie up
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local split_cookie = utils.split(received_pow_cookie, "#")
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if #split_cookie ~= 4 then
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return
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end
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local given_user_key = split_cookie[1]
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local given_challenge_hash = split_cookie[2]
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local given_signature = split_cookie[3]
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local given_nonce = split_cookie[4]
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-- regenerate the challenge and compare it
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local generated_challenge_hash = utils.generate_secret(txn, pow_cookie_secret, given_user_key, false)
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if given_challenge_hash ~= generated_challenge_hash then
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return
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end
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-- regenerate the signature and compare it
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local generated_signature = sha.hmac(sha.sha256, hmac_cookie_secret, given_user_key .. given_challenge_hash)
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if given_signature ~= generated_signature then
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return
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end
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-- check the work
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local completed_work = sha.sha256(generated_challenge_hash .. given_nonce)
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local challenge_offset = tonumber(generated_challenge_hash:sub(1,1),16) * 2
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if completed_work:sub(challenge_offset+1, challenge_offset+4) == '0041' then -- i dont know lua properly :^)
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return txn:set_var("txn.pow_passed", true)
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end
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end
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return _M
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