print some logs when blocking bots

confs/site/antibot-captcha.conf

@@ -7,6 +7,7 @@ location = %ANTIBOT_URI% {
 			local cookie	= require "cookie"
 			local captcha	= require "captcha"
 			if not cookie.is_set("uri") then
+				ngx.log(ngx.WARN, "[ANTIBOT] captcha fail (1) for " .. ngx.var.remote_addr)
 				return ngx.exit(ngx.HTTP_FORBIDDEN)
 			end
 			local img, res = captcha.get_challenge()
@@ -21,16 +22,19 @@ location = %ANTIBOT_URI% {
 			local cookie	= require "cookie"
 			local captcha	= require "captcha"
 			if not cookie.is_set("captchares") then
+				ngx.log(ngx.WARN, "[ANTIBOT] captcha fail (2) for " .. ngx.var.remote_addr)
 				return ngx.exit(ngx.HTTP_FORBIDDEN)
 			end
 			ngx.req.read_body()
 			local args, err = ngx.req.get_post_args(1)
 			if err == "truncated" or not args or not args["captcha"] then
+				ngx.log(ngx.WARN, "[ANTIBOT] captcha fail (3) for " .. ngx.var.remote_addr)
 				return ngx.exit(ngx.HTTP_FORBIDDEN)
 			end
 			local captcha_user	= args["captcha"]
 			local check		= captcha.check(captcha_user, cookie.get("captchares"))
 			if not check then
+				ngx.log(ngx.WARN, "[ANTIBOT] captcha fail (4) for " .. ngx.var.remote_addr)
 				return ngx.redirect("%ANTIBOT_URI%")
 			end
 			cookie.set({captcha = "ok"})

confs/site/antibot-javascript.conf

@@ -7,6 +7,7 @@ location = %ANTIBOT_URI% {
 			local cookie		= require "cookie"
 			local javascript	= require "javascript"
 			if not cookie.is_set("challenge") then
+				ngx.log(ngx.WARN, "[ANTIBOT] javascript fail (1) for " .. ngx.var.remote_addr)
 				return ngx.exit(ngx.HTTP_FORBIDDEN)
 			end
 			local challenge	= cookie.get("challenge")
@@ -20,16 +21,19 @@ location = %ANTIBOT_URI% {
 			local cookie		= require "cookie"
 			local javascript	= require "javascript"
 			if not cookie.is_set("challenge") then
+				ngx.log(ngx.WARN, "[ANTIBOT] javascript fail (2) for " .. ngx.var.remote_addr)
 				return ngx.exit(ngx.HTTP_FORBIDDEN)
 			end
 			ngx.req.read_body()
 			local args, err = ngx.req.get_post_args(1)
 			if err == "truncated" or not args or not args["challenge"] then
+				ngx.log(ngx.WARN, "[ANTIBOT] javascript fail (3) for " .. ngx.var.remote_addr)
 				return ngx.exit(ngx.HTTP_FORBIDDEN)
 			end
-			local challenge	= args["challenge"]
+			local challenge		= args["challenge"]
 			local check		= javascript.check(cookie.get("challenge"), challenge)
 			if not check then
+				ngx.log(ngx.WARN, "[ANTIBOT] javascript fail (4) for " .. ngx.var.remote_addr)
 				return ngx.exit(ngx.HTTP_FORBIDDEN)
 			end
 			cookie.set({javascript = "ok"})

confs/site/antibot-recaptcha.conf

@@ -7,6 +7,7 @@ location = %ANTIBOT_URI% {
 			local cookie	= require "cookie"
 			local recaptcha	= require "recaptcha"
 			if not cookie.is_set("uri") then
+				ngx.log(ngx.WARN, "[ANTIBOT] recaptcha fail (1) for " .. ngx.var.remote_addr)
 				return ngx.exit(ngx.HTTP_FORBIDDEN)
 			end
 			local code = recaptcha.get_code("%ANTIBOT_URI%", "%ANTIBOT_RECAPTCHA_SITEKEY%")
@@ -19,17 +20,19 @@ location = %ANTIBOT_URI% {
 			local cookie	= require "cookie"
 			local recaptcha	= require "recaptcha"
 			if not cookie.is_set("uri") then
+				ngx.log(ngx.WARN, "[ANTIBOT] recaptcha fail (2) for " .. ngx.var.remote_addr)
 				return ngx.exit(ngx.HTTP_FORBIDDEN)
 			end
 			ngx.req.read_body()
 			local args, err = ngx.req.get_post_args(1)
 			if err == "truncated" or not args or not args["token"] then
+				ngx.log(ngx.WARN, "[ANTIBOT] recaptcha fail (3) for " .. ngx.var.remote_addr)
 				return ngx.exit(ngx.HTTP_FORBIDDEN)
 			end
 			local token	= args["token"]
 			local check	= recaptcha.check(token, "%ANTIBOT_RECAPTCHA_SECRET%")
 			if check < %ANTIBOT_RECAPTCHA_SCORE% then
-				ngx.log(ngx.WARN, "client has recaptcha score of " .. tostring(check))
+				ngx.log(ngx.WARN, "[ANTIBOT] recaptcha fail (4) for " .. ngx.var.remote_addr .. " (score = " .. tostring(check) .. ")")
 				return ngx.exit(ngx.HTTP_FORBIDDEN)
 			end
 			cookie.set({recaptcha = "ok"})

confs/site/main-lua.conf

@@ -80,22 +80,26 @@ end
 
 -- check if user-agent is allowed
 if use_user_agent and ngx.var.bad_user_agent == "yes" then
+	ngx.log(ngx.WARN, "[BLOCK] User-Agent " .. ngx.var.http_user_agent .. " is blacklisted")
 	ngx.exit(ngx.HTTP_FORBIDDEN)
 end
 
 -- check if referrer is allowed
 if use_referrer and ngx.var.bad_referrer == "yes" then
+	ngx.log(ngx.WARN, "[BLOCK] Referrer " .. ngx.var.http_referer .. " is blacklisted")
 	ngx.exit(ngx.HTTP_FORBIDDEN)
 end
 
 -- check if country is allowed
 if use_country and ngx.var.allowed_country == "no" then
+	ngx.log(ngx.WARN, "[BLOCK] Country of " .. ngx.var.remote_addr .. " is blacklisted")
 	ngx.exit(ngx.HTTP_FORBIDDEN)
 end
 
 -- check if IP is in DNSBLs (only if not in cache)
 if use_dnsbl and not dnsbl.cached() then
 	if dnsbl.check() then
+		ngx.log(ngx.WARN, "[BLOCK] IP " .. ngx.var.remote_addr .. " is in DNSBL")
 		ngx.exit(ngx.HTTP_FORBIDDEN)
 	end
 end
@@ -119,6 +123,7 @@ if use_antibot_cookie then
 			cookie.set({uri = ngx.var.request_uri})
 			return ngx.redirect(antibot_uri)
 		end
+		ngx.log(ngx.WARN, "[ANTIBOT] cookie fail for " .. ngx.var.remote_addr)
 		return ngx.exit(ngx.HTTP_FORBIDDEN)
 	else
 		if ngx.var.request_uri == antibot_uri then
@@ -140,7 +145,7 @@ end
 -- captcha check
 if use_antibot_captcha then
 	if not cookie.is_set("captcha") then
-		if ngx.var.request_uri ~= antibot_uri and ngx.var.request_uri ~= "/favicon.ico" then
+		if ngx.var.request_uri ~= antibot_uri then
 			cookie.set({uri = ngx.var.request_uri})
 			return ngx.redirect(antibot_uri)
 		end
@@ -150,7 +155,7 @@ end
 -- recaptcha check
 if use_antibot_recaptcha then
 	if not cookie.is_set("recaptcha") then
-		if ngx.var.request_uri ~= antibot_uri and ngx.var.request_uri ~= "/favicon.ico" then
+		if ngx.var.request_uri ~= antibot_uri then
 			cookie.set({uri = ngx.var.request_uri})
 			return ngx.redirect(antibot_uri)
 		end