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antibot - various fixes, not fully fixed yet

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florian 2023-04-22 22:18:35 +02:00
parent 502d4fcc08
commit 95c231515e
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GPG key ID: 3D80806F12602A7C
7 changed files with 54 additions and 43 deletions
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2
src/common/confs/server-http/access-lua.conf
View file

@ -100,6 +100,8 @@ logger:log(ngx.INFO, "called access() methods of plugins")
local ok, err = utils.save_session()
if not ok then
logger:log(ngx.ERR, "can't save session : " .. err)
else
logger:log(ngx.NOTICE, "session save return : " .. err)
end
logger:log(ngx.INFO, "access phase ended")

76
src/common/core/antibot/antibot.lua
View file

@ -23,14 +23,8 @@ function antibot:access()
return self:ret(true, "antibot not activated")
end
-- Prepare challenge
local ok, err = self:prepare_challenge(antibot, self.variables["ANTIBOT_URI"])
if not ok then
return self:ret(false, "can't prepare challenge : " .. err, ngx.HTTP_INTERNAL_SERVER_ERROR)
end
-- Don't go further if client resolved the challenge
local resolved, err, original_uri = self:challenge_resolved(antibot)
local resolved, err, original_uri = self:challenge_resolved()
if resolved == nil then
return self:ret(false, "can't check if challenge is resolved : " .. err)
end
@ -43,26 +37,38 @@ function antibot:access()
-- Redirect to challenge page
if ngx.ctx.bw.uri ~= self.variables["ANTIBOT_URI"] then
ngx.ctx.bw.antibot_display_content = true
return self:ret(true, "redirecting client to the challenge uri", nil, self.variables["ANTIBOT_URI"])
end
-- Display challenge needed
if ngx.ctx.bw.request_method == "GET" then
-- Prepare challenge
local ok, err = self:prepare_challenge()
if not ok then
return self:ret(false, "can't prepare challenge : " .. err, ngx.HTTP_INTERNAL_SERVER_ERROR)
end
ngx.ctx.bw.antibot_display_content = true
return self:ret(true, "displaying challenge to client", ngx.HTTP_OK)
return self:ret(true, "displaying challenge to client", ngx.OK)
end
-- Check challenge
if ngx.ctx.bw.request_method == "POST" then
local ok, err, redirect = self:check_challenge(antibot)
local ok, err, redirect = self:check_challenge()
if ok == nil then
return self:ret(false, "check challenge error : " .. err, ngx.HTTP_INTERNAL_SERVER_ERROR)
elseif not ok then
self.logger:log(ngx.WARN, "client failed challenge : " .. err)
local ok, err = self:prepare_challenge()
if not ok then
return self:ret(false, "can't prepare challenge : " .. err, ngx.HTTP_INTERNAL_SERVER_ERROR)
end
end
if redirect then
return self:ret(true, "check challenge redirect : " .. redirect, nil, redirect)
end
ngx.ctx.bw.antibot_display_content = true
return self:ret(true, "displaying challenge to client", ngx.HTTP_OK)
return self:ret(true, "displaying challenge to client", ngx.OK)
end
-- Method is suspicious, let's deny the request
@ -70,12 +76,8 @@ function antibot:access()
end
function antibot:content()
-- Check if access is needed
local antibot, err = utils.get_variable("USE_ANTIBOT")
if antibot == nil then
return self:ret(false, err)
end
if antibot == "no" then
-- Check if content is needed
if not self.variables["USE_ANTIBOT"] or self.variables["USE_ANTIBOT"] == "no" then
return self:ret(true, "antibot not activated")
end
-- Check if display content is needed
@ -83,7 +85,7 @@ function antibot:content()
return self:ret(true, "display content not needed")
end
-- Display content
local ok, err = self:display_challenge(antibot)
local ok, err = self:display_challenge()
if not ok then
return self:ret(false, "display challenge error : " .. err)
end
@ -108,11 +110,17 @@ function antibot:challenge_resolved()
return false, "challenge not resolved", data.original_uri
end
function antibot:prepare_challenge()
function antibot:prepare_challenge(only_open)
local session, err, exists, refreshed = utils.get_session()
if err then
return false, "session error : " .. err
end
if exists and only_open then
local ok, err, raw_data = utils.get_session_var("antibot")
if ok and raw_data and cjson.decode(raw_data).antibot == self.variables["USE_ANTIBOT"] then
return true, "already prepared"
end
end
local set_needed = false
local data = nil
if exists then
@ -154,7 +162,7 @@ function antibot:prepare_challenge()
return true, "prepared"
end
function antibot:display_challenge(challenge_uri)
function antibot:display_challenge()
-- Open session
local session, err, exists, refreshed = utils.get_session()
if err then
@ -223,7 +231,7 @@ function antibot:check_challenge()
local data = cjson.decode(raw_data)
-- Check if session type is equal to antibot type
if elf.variables["USE_ANTIBOT"] ~= data.type then
if self.variables["USE_ANTIBOT"] ~= data.type then
return nil, "session type is different from antibot type", nil
end
@ -236,7 +244,7 @@ function antibot:check_challenge()
ngx.req.read_body()
local args, err = ngx.req.get_post_args(1)
if err == "truncated" or not args or not args["challenge"] then
return false, "missing challenge arg", nil
return nil, "missing challenge arg", nil
end
local hash = sha256:new()
hash:update(data.random .. args["challenge"])
@ -246,9 +254,9 @@ function antibot:check_challenge()
return false, "wrong value", nil
end
data.resolved = true
local ok, err = utils.set_session("antibot", cjson.encode(data))
local ok, err = utils.set_session_var("antibot", cjson.encode(data))
if not ok then
return false, "error while setting session antibot : " .. err
return nil, "error while setting session antibot : " .. err
end
return true, "resolved", data.original_uri
end
@ -258,15 +266,15 @@ function antibot:check_challenge()
ngx.req.read_body()
local args, err = ngx.req.get_post_args(1)
if err == "truncated" or not args or not args["captcha"] then
return false, "missing challenge arg", nil
return nil, "missing challenge arg", nil
end
if data.text ~= args["captcha"] then
return false, "wrong value", nil
end
data.resolved = true
local ok, err = utils.set_session("antibot", cjson.encode(data))
local ok, err = utils.set_session_var("antibot", cjson.encode(data))
if not ok then
return false, "error while setting session antibot : " .. err
return nil, "error while setting session antibot : " .. err
end
return true, "resolved", data.original_uri
end
@ -276,11 +284,11 @@ function antibot:check_challenge()
ngx.req.read_body()
local args, err = ngx.req.get_post_args(1)
if err == "truncated" or not args or not args["token"] then
return false, "missing challenge arg", nil
return nil, "missing challenge arg", nil
end
local httpc, err = http.new()
if not httpc then
return false, "can't instantiate http object : " .. err, nil, nil
return nil, "can't instantiate http object : " .. err, nil, nil
end
local res, err = httpc:request_uri("https://www.google.com/recaptcha/api/siteverify", {
method = "POST",
@ -301,9 +309,9 @@ function antibot:check_challenge()
return false, "client failed challenge with score " .. tostring(rdata.score), nil
end
data.resolved = true
local ok, err = utils.set_session("antibot", cjson.encode(data))
local ok, err = utils.set_session_var("antibot", cjson.encode(data))
if not ok then
return false, "error while setting session antibot : " .. err
return nil, "error while setting session antibot : " .. err
end
return true, "resolved", data.original_uri
end
@ -313,11 +321,11 @@ function antibot:check_challenge()
ngx.req.read_body()
local args, err = ngx.req.get_post_args(1)
if err == "truncated" or not args or not args["token"] then
return false, "missing challenge arg", nil
return nil, "missing challenge arg", nil
end
local httpc, err = http.new()
if not httpc then
return false, "can't instantiate http object : " .. err, nil, nil
return nil, "can't instantiate http object : " .. err, nil, nil
end
local res, err = httpc:request_uri("https://hcaptcha.com/siteverify", {
method = "POST",
@ -338,9 +346,9 @@ function antibot:check_challenge()
return false, "client failed challenge", nil
end
data.resolved = true
local ok, err = utils.set_session("antibot", cjson.encode(data))
local ok, err = utils.set_session_var("antibot", cjson.encode(data))
if not ok then
return false, "error while setting session antibot : " .. err
return nil, "error while setting session antibot : " .. err
end
return true, "resolved", data.original_uri
end

11
src/common/core/antibot/confs/server-http/antibot.conf
View file

@ -1,17 +1,18 @@
{% if USE_ANTIBOT != "no" +%}
location /{{ ANTIBOT_URI }} {
location {{ ANTIBOT_URI }} {
default_type 'text/html';
root /usr/share/bunkerweb/core/antibot/files;
content_by_lua_block {
local cantibot = require "antibot.antibot"
local clogger = require "bunkerweb.logger"
local antibot = cantibot:new()
local logger = clogger:new("ANTIBOT")
local ok, err = antibot:content()
if not ok then
logger:log(ngx.ERR, "antibot:content() failed : " .. err)
local ret = antibot:content()
if not ret.ret then
logger:log(ngx.ERR, "antibot:content() failed : " .. ret.msg)
else
logger:log(ngx.INFO, "antibot:content() success : " .. err)
logger:log(ngx.INFO, "antibot:content() success : " .. ret.msg)
end
}
}

2
src/common/core/antibot/files/captcha.html
View file

@ -130,7 +130,7 @@
<div class="cover message">
<h1>Please prove that you are Human before accessing this website</h1>
<p class="lead">
<form class="form" method="POST" action="{{antibot_uri}}">
<form class="form" method="POST" action="{*antibot_uri*}">
<img src="data:image/jpeg;base64,{{captcha}}"/>
<input class="captcha" type="text" name="captcha" /> <input class="btn" type="submit" value="Submit" />
</form>

2
src/common/core/antibot/files/hcaptcha.html
View file

@ -220,7 +220,7 @@
JavaScript needs to be enabled in order to visit this website.
</p>
</noscript>
<form method="POST" action="{{antibot_uri}}" id="form">
<form method="POST" action="{*antibot_uri*}" id="form">
<input type="hidden" name="token" id="token" />
</form>
<div>

2
src/common/core/antibot/files/javascript.html
View file

@ -136,7 +136,7 @@
<div class="lds-roller"><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div></div>
</p>
</div>
<form method="POST" action="{{antibot_uri}}" id="form">
<form method="POST" action="{*antibot_uri*}" id="form">
<input type="hidden" name="challenge" id="challenge">
</form>
<footer>

2
src/common/core/antibot/files/recaptcha.html
View file

@ -138,7 +138,7 @@
<a href="https://policies.google.com/terms">Terms of Service</a> apply.
</p>
</div>
<form method="POST" action="{{antibot_uri}}" id="form">
<form method="POST" action="{*antibot_uri*}" id="form">
<input type="hidden" name="token" id="token" />
</form>
<footer>