106 lines
2.7 KiB
Lua
106 lines
2.7 KiB
Lua
-- waf core lib
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require "config"
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-- Get the client IP
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function get_client_ip()
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local CLIENT_IP = ngx.req.get_headers(0)["X_real_ip"]
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if CLIENT_IP == nil then
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CLIENT_IP = ngx.req.get_headers(0)["X_Forwarded_For"]
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end
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if CLIENT_IP == nil then
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CLIENT_IP = ngx.var.remote_addr
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end
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if CLIENT_IP == nil then
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CLIENT_IP = "unknown"
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end
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return CLIENT_IP
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end
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-- Get the client user agent
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function get_user_agent()
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local USER_AGENT = ngx.var.http_user_agent
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if USER_AGENT == nil then
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USER_AGENT = "unknown"
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end
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return USER_AGENT
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end
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-- Get WAF rule
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function get_rule(rulefilename)
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local io = require "io"
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local RULE_PATH = config_rule_dir
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local RULE_FILE = io.open(RULE_PATH..'/'..rulefilename,"r")
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if RULE_FILE == nil then
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return
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end
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local RULE_TABLE = {}
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for line in RULE_FILE:lines() do
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table.insert(RULE_TABLE,line)
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end
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RULE_FILE:close()
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return(RULE_TABLE)
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end
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-- WAF log record for json,(use logstash codec => json)
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function log_record(method,url,data,ruletag)
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local cjson = require("cjson")
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local io = require "io"
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local LOG_PATH = config_log_dir
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local CLIENT_IP = get_client_ip()
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local USER_AGENT = get_user_agent()
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local SERVER_NAME = ngx.var.host
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local LOCAL_TIME = ngx.localtime()
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local log_json_obj = {
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client_ip = CLIENT_IP,
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local_time = LOCAL_TIME,
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server_name = SERVER_NAME,
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req_url = url,
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attack_method = method,
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req_data = data,
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rule_tag = ruletag,
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user_agent = USER_AGENT,
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}
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local LOG_LINE = cjson.encode(log_json_obj)
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local LOG_NAME = LOG_PATH..'/'..ngx.today().."_sec.log"
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local file = io.open(LOG_NAME,"a")
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if file == nil then
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return
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end
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file:write(LOG_LINE.."\n")
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file:flush()
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file:close()
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end
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-- test log
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function test_log_record(data)
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local cjson = require("cjson")
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local io = require "io"
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local LOG_PATH = config_log_dir
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local CLIENT_IP = get_client_ip()
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local LOCAL_TIME = ngx.localtime()
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local log_json_obj = {
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client_ip = CLIENT_IP,
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req_data = data,
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}
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local LOG_LINE = cjson.encode(log_json_obj)
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local LOG_NAME = LOG_PATH..'/'.."test.log"
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local file = io.open(LOG_NAME,"a")
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if file == nil then
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return
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end
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file:write(LOG_LINE.."\n")
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file:flush()
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file:close()
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end
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-- WAF return
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function waf_output()
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if config_waf_output == "redirect" then
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ngx.redirect(config_waf_redirect_url, 301)
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else
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ngx.header.content_type = "text/html"
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ngx.status = ngx.HTTP_FORBIDDEN
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ngx.say(config_output_html)
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ngx.exit(ngx.status)
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end
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end |