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https://gitgud.io/fatchan/haproxy-protection.git
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Thomas Lynch
@ -50,14 +50,14 @@ local body_template = [[
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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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.b{display:inline-block;background:#6b93f7;border-radius:50%%;margin:10px;height:16px;width:16px;box-shadow:0 0 0 0 #6b93f720;transform:scale(1)}
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.b:nth-of-type(1){animation:p 3s infinite}
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.b:nth-of-type(2){animation:p 3s .5s infinite}
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.b:nth-of-type(3){animation:p 3s 1s infinite}
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@keyframes p{0%%{transform:scale(.95);box-shadow:0 0 0 0 #6b93f790}70%%{transform:scale(1);box-shadow:0 0 0 10px #6b93f700}100%%{transform:scale(.95);box-shadow:0 0 0 0 #6b93f700}}
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.h-captcha{min-height:85px;display:block}
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.red{color:red;font-weight:bold}
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@media (prefers-color-scheme:light){:root{--text-color:#333;--bg-color:#EEE}}
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.b{display:inline-block;background:#6b93f7;border-radius:50%%;margin:10px;height:16px;width:16px;box-shadow:0 0 0 0 #6b93f720;transform:scale(1)}
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.b:nth-of-type(1){animation:p 3s infinite}
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.b:nth-of-type(2){animation:p 3s .5s infinite}
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.b:nth-of-type(3){animation:p 3s 1s infinite}
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@keyframes p{0%%{transform:scale(.95);box-shadow:0 0 0 0 #6b93f790}70%%{transform:scale(1);box-shadow:0 0 0 10px #6b93f700}100%%{transform:scale(.95);box-shadow:0 0 0 0 #6b93f700}}
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.h-captcha{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;text-align:center;margin:0}
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@ -104,20 +104,20 @@ local captcha_section_template = [[
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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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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 challenge string for proof of work
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generated_work = utils.generate_secret(applet, pow_cookie_secret, true, "")
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generated_work = utils.generate_secret(applet, pow_cookie_secret, true, "")
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-- define body sections
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local captcha_body = ""
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local pow_body = ""
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local captcha_body = ""
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local pow_body = ""
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-- pretty much same as decice_checks but path is different. todo: refactor and pass the applet, with some ifs for applet vs txn
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local captcha_enabled = false
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local host = applet.headers['host'][0]
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local captcha_enabled = false
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local host = applet.headers['host'][0]
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local domain_lookup = captcha_map:lookup(host) or 0
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domain_lookup = tonumber(domain_lookup)
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local path = applet.qs; --because on /bot-check?/whatever, .qs (query string) holds the "path"
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@ -129,58 +129,65 @@ function _M.view(applet)
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--
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-- pow at least is always enabled when reaching bot-check page
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if captcha_enabled then
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if captcha_enabled then
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captcha_body = string.format(captcha_section_template, captcha_sitekey)
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else
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pow_body = pow_section_template
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end
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else
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pow_body = pow_section_template
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end
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-- sub in the body sections
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response_body = string.format(body_template, generated_work, pow_body, captcha_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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if parsed_body["h-captcha-response"] then
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local hcaptcha_url = string.format(
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"https://%s/siteverify",
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core.backends["hcaptcha"].servers["hcaptcha"]:get_addr()
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)
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response_body = string.format(body_template, generated_work, pow_body, captcha_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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if parsed_body["h-captcha-response"] then
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local hcaptcha_url = string.format(
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"https://%s/siteverify",
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core.backends["hcaptcha"].servers["hcaptcha"]:get_addr()
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)
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local hcaptcha_data = string.format(
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"secret=%s&response=%s",
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captcha_secret,
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parsed_body["h-captcha-response"]
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captcha_secret,
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parsed_body["h-captcha-response"]
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)
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local res, err = http.post({data=hcaptcha_data, url=hcaptcha_url, headers={host=captcha_provider_domain, ["content-type"]="application/x-www-form-urlencoded"} })
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local status, api_response = pcall(res.json, res)
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if not status then
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local original_error = api_response
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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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local floating_hash = utils.generate_secret(applet, hcaptcha_cookie_secret, true, nil)
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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;", floating_hash)
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)
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end
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end
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local res, err = http.post({
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data=hcaptcha_data,
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url=hcaptcha_url,
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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(res.json, res)
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if not status then
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local original_error = api_response
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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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local floating_hash = utils.generate_secret(applet, hcaptcha_cookie_secret, true, nil)
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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;", floating_hash)
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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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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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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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-- decide which checks to do based on domain and path and domain acls
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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 host = txn.sf:hdr("Host")
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local domain_lookup = captcha_map:lookup(host) or 0
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domain_lookup = tonumber(domain_lookup)
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local path = txn.sf:path();
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@ -199,24 +206,24 @@ end
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-- check if captcha token 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 expected_cookie = utils.generate_secret(txn, hcaptcha_cookie_secret, false, nil)
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if parsed_request_cookies["z_ddos_captcha"] == expected_cookie then
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return txn:set_var("txn.captcha_passed", true)
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end
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local parsed_request_cookies = cookie.get_cookie_table(txn.sf:hdr("Cookie"))
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local expected_cookie = utils.generate_secret(txn, hcaptcha_cookie_secret, false, nil)
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if parsed_request_cookies["z_ddos_captcha"] == expected_cookie 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 token 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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if parsed_request_cookies["z_ddos_pow"] then
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local generated_work = utils.generate_secret(txn, pow_cookie_secret, false, "")
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local iterations = parsed_request_cookies["z_ddos_pow"]
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local completed_work = sha.sha1(generated_work .. iterations)
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local parsed_request_cookies = cookie.get_cookie_table(txn.sf:hdr("Cookie"))
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if parsed_request_cookies["z_ddos_pow"] then
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local generated_work = utils.generate_secret(txn, pow_cookie_secret, false, "")
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local iterations = parsed_request_cookies["z_ddos_pow"]
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local completed_work = sha.sha1(generated_work .. iterations)
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local challenge_offset = tonumber(generated_work:sub(1,1),16) * 2
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if completed_work:sub(challenge_offset+1, challenge_offset+4) == 'b00b' 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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if completed_work:sub(challenge_offset+1, challenge_offset+4) == 'b00b' 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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end
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