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| json = require "cjson.safe"
md5 = require "md5"
redis = require "redis"
login_url = "/login"
success_code = 0
event_name = "login_audit"
event_type = "lua"
name = "login_audit.json"
proto = "TCP"
host = "127.0.0.1"
port = 6379
http_common_mapping = '{"accept":"accept","accept-charset":"accept_charset","accept-encoding":"accept_encoding","accept-language":"accept_language","user-agent":"user_agent"}'
common_mapping_table = json.decode(http_common_mapping)
function md5Encode(args)
m = md5.new()
m:update(args)
return md5.tohex(m:finish())
end
function formatStr(args)
t = {}
ios = string.match(args, 'canon')
if ios ~= nil then
mail = 'email"%s+(.-)%s'
t['email'] = string.match(args, mail)
else
data = string.split(args, '&')
for n, v in ipairs(data) do
d = string.split(v, '=')
t[d[1]] = d[2]
end
end
return t
end
function string.split(s, p)
rt = {}
string.gsub(s, '[^'..p..']+', function(w) table.insert(rt, w) end )
return rt
end
function init (args)
local needs = {}
needs["protocol"] = "http"
return needs
end
function setup (args)
filename = SCLogPath() .. "/" .. name
file = assert(io.open(filename, "a"))
SCLogInfo("app_login_audit filename: " .. filename)
http = 0
SCLogInfo("Connect Redis Server...")
client = redis.connect(host, port)
response = client:ping()
if response then
SCLogInfo("Redis Server connection succeeded.")
end
end
function log(args)
http_table = {}
ti = {
tags = {}
}
score = 50
http_hostname = HttpGetRequestHost()
http_url = HttpGetRequestUriNormalized()
rl = HttpGetRequestLine()
if rl then
http_method = string.match(rl, "%w+")
if http_method then
http_table["method"] = http_method
end
end
if http_url == login_url and http_method == "POST" then
http_table["hostname"] = http_hostname
http_table["url"] = http_url
http_table["url_path"] = http_url
rsl = HttpGetResponseLine()
if rsl then
status_code = string.match(rsl, "%s(%d+)%s")
http_table["status"] = tonumber(status_code)
http_protocol = string.match(rsl, "(.-)%s")
http_table["protocol"] = http_protocol
end
a, o, e = HttpGetResponseBody()
if a then
for n, v in ipairs(a) do
body = json.decode(v)
results_code = tonumber(body["code"])
if results_code == success_code then
http_table["results"] = "success"
else
http_table["results"] = "failed"
end
end
http_table["results_code"] = results_code
end
a, o, e = HttpGetRequestBody()
if a then
for n, v in ipairs(a) do
res = formatStr(v)
if res["email"] then
black_ioc = client:get(res["email"])
if black_ioc then
ti["provider"] = "Canon"
ti["producer"] = "NTA"
table.insert(ti["tags"], "account in blacklist")
score = score + 10
end
end
end
end
rh = HttpGetRequestHeaders()
if rh then
for k, v in pairs(rh) do
key = string.lower(k)
request_var = request_mapping_table[key]
if request_var then
http_table[request_var] = v
end
end
end
rsh = HttpGetResponseHeaders()
if rsh then
for k, v in pairs(rsh) do
key = string.lower(k)
response_var = response_mapping_table[key]
if response_var then
http_table[response_var] = v
end
end
end
sec, usec = SCPacketTimestamp()
timestring = os.date("!%Y-%m-%dT%T", sec) .. '.' .. usec .. '+0000'
ip_version, src_ip, dst_ip, protocol, src_port, dst_port = SCFlowTuple()
id = SCFlowId()
flow_id = string.format("%.0f", id)
flow_id = tonumber(flow_id)
true_client_ip = HttpGetRequestHeader("True-Client-IP")
if true_client_ip ~= nil then
src_ip = true_client_ip
end
tetrad = src_ip .. src_port .. dst_ip .. dst_port
session_id = md5Encode(tetrad)
raw_data = {
timestamp = timestring,
flow_id = flow_id,
session_id = session_id,
src_ip = src_ip,
src_port = src_port,
proto = proto,
dest_ip = dst_ip,
dest_port = dst_port,
event_name = event_name,
event_type = event_type,
app_type = app_type,
http = http_table,
ti = ti,
score = score
}
data = json.encode(raw_data)
file:write(data .. "\n")
file:flush()
http = http + 1
end
end
function deinit (args)
SCLogInfo ("app_login_audit transactions logged: " .. http);
file:close(file)
end
|
