Nginx recipes: basic authorization with captcha

For authorization with captcha, we need nginx itself and its plugins encrypted-session , form-input , ctpp2 , echo , headers-more , auth_request , auth_basic , set-misc . (I gave links to my forks, because I made some changes that I haven’t yet been able to push through to the original repositories. You can also use a ready-made way .)

To get started, let's set

encrypted_session_key "abcdefghijklmnopqrstuvwxyz123456";

Next, just in case, disable the authorization header

 more_clear_input_headers Authorization;

Now we protect everything by authorization

 auth_request /auth; location =/auth { internal; subrequest_access_phase on; #      auth_request off; #    set_decode_base64 $auth_decode $cookie_auth; #    set_decrypt_session $auth_decrypt $auth_decode; #    if ($auth_decrypt = "") { return 401 UNAUTHORIZED; } #    ,      more_set_input_headers "Authorization: Basic $auth_decrypt"; #    basic (   $remote_user) auth_basic_user_file /data/nginx/.htaccess; #   basic  auth_basic Auth; #  basic  echo -n OK; #   }

For authorized users, we show content from their folder.

 location / { alias html/$remote_user/; }

And in the absence of authorization, we show the authorization form with captcha.

 error_page 401 = @error401; location @error401 { set_escape_uri $request_uri_escape $request_uri; #   return 303 /login?request_uri=$request_uri_escape; #      ,   } location =/login { default_type "text/html; charset=utf-8"; #   if ($request_method = GET) { #        template login.html.ct2; #   ctpp2 on; #   set_secure_random_alphanum $csrf_random 32; #   csrf encrypted_session_expires 300; #    csrf 5  (5 * 60 = 300) set_encrypt_session $csrf_encrypt $csrf_random; #   csrf set_encode_base64 $csrf_encode $csrf_encrypt; #   csrf add_header Set-Cookie "CSRF=$csrf_encode; Max-Age=300"; #   csrf    5  (5 * 60 = 300) return 200 "{\"csrf\":\"$csrf_random\"}"; #  json   } #  -      set_form_input $csrf_form csrf; #  csrf   set_unescape_uri $csrf_unescape $csrf_form; #  csrf   set_decode_base64 $csrf_decode $cookie_csrf; #  csrf   set_decrypt_session $csrf_decrypt $csrf_decode; #  csrf   if ($csrf_decrypt != $csrf_unescape) { return 303 $request_uri; } #  csrf      csrf  ,       set_form_input $captcha_form captcha; #     set_unescape_uri $captcha_unescape $captcha_form; #     set_md5 $captcha_md5 "secret${captcha_unescape}${csrf_decrypt}"; #  md5 if ($captcha_md5 != $cookie_captcha) { return 303 $request_uri; } #  md5      ,       set_form_input $username_form username; #     set_form_input $password_form password; #     set_unescape_uri $username_unescape $username_form; #     set_unescape_uri $password_unescape $password_form; #     encrypted_session_expires 2592000; #     30  (30 * 24 * 60 * 60 = 2592000) set $username_password "$username_unescape:$password_unescape"; #  basic  set_encode_base64 $username_password_encode $username_password; #  basic  set_encrypt_session $auth_encrypt $username_password_encode; #  basic  set_encode_base64 $auth_encode $auth_encrypt; #   basic  add_header Set-Cookie "Auth=$auth_encode; Max-Age=2592000"; #   basic      30  (30 * 24 * 60 * 60 = 2592000) set $arg_request_uri_or_slash $arg_request_uri; #     set_if_empty $arg_request_uri_or_slash "/"; #    ,   set_unescape_uri $request_uri_unescape $arg_request_uri_or_slash; #   return 303 $request_uri_unescape; #     }

 <html> <body> <form method="post"> <input type="hidden" name="csrf" value="<TMPL_var csrf>" /> username: <input type="text" name="username" placeholder="Enter User Name..." /><br /> password: <input type="password" name="password" /><br /> captcha: <img src="/captcha?csrf=<TMPL_var csrf>"/><input type="text" name="captcha" autocomplete="off" /><br /> <input type="submit" name="submit" value="submit" /> </form> </body> </html>

Source: https://habr.com/ru/post/456556/

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Nginx recipes: basic authorization with captcha

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