应用场景：
1、数据库安全审计定义为 禁止某些命令 比如 drop mysqldump outfile intofile 这些平时正常程序用不到的指令。
2、数据库安全则定义为 虚拟用户，所有应用程序都使用虚拟用户连接数据库，提升数据库安全。
3、对查询出来的结果集进行正则替换，把敏感数据脱敏处理，比如身份证、手机号、邮箱、电话等
4、数据库安全还有就是过滤处理查询请求的SQL，修改后再发送查询，对SQL查询做用户的日志记录。
如图，所有手机号的中间4位都被隐藏为#号再显示出来。
中间件名称 mysql-proxy ，基于lua实现对 连接认证 SQL请求处理 结果集返回处理的相关
配置结构
/etc/mysql-proxy.cnf #基本配置，包括有用于主从日志权限的用户
/usr/local/mysql-proxy/lua/admin-sql.lua #默认运行配置相关，不需要修改
/usr/local/mysql-proxy/lua/rw-splitting.lua #核心业务逻辑，处理 请求 认证 结果集返回等所有业务
/usr/local/mysql-proxy/lib/mysql-proxy/lua/proxy/userlist.lua #虚拟用户列表，用于连接mysql但不存在于mysql真实用户中的
/usr/local/mysql-proxy/lib/mysql-proxy/lua/proxy/realuser.lua 虚拟用户共用的真实mysql用户密码
#sql请求日志是基于虚拟用户记录
/usr/local/mysql-proxy/lib/mysql-proxy/lua/proxy/userpass.lua #不使用虚拟用户认证的 用户名，当这里的用户名连接时直接抛给mysql去认证
/usr/local/mysql-proxy/lib/mysql-proxy/lua/proxy/nomask.lua #不需要脱敏的用户，当这类用户名进行sql查询时，不进行数据脱敏
rw-splitting.lua 核心代码
--[[ $%BEGINLICENSE%$
Copyright (c) 2007, 2012, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; version 2 of the
License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
$%ENDLICENSE%$ --]]
---
-- a flexible statement based load balancer with connection pooling
--
-- * build a connection pool of min_idle_connections for each backend and maintain
-- its size
-- *
--
--
local commands = require("proxy.commands")
local tokenizer = require("proxy.tokenizer")
local lb = require("proxy.balance")
local auto_config = require("proxy.auto-config")
--- config
--
-- connection pool
if not proxy.global.config.rwsplit then
proxy.global.config.rwsplit = {
min_idle_connections = 4,
max_idle_connections = 8,
is_debug = false
}
end
---
-- read/write splitting sends all non-transactional SELECTs to the slaves
--
-- is_in_transaction tracks the state of the transactions
local is_in_transaction = false
-- if this was a SELECT SQL_CALC_FOUND_ROWS ... stay on the same connections
local is_in_select_calc_found_rows = false
---
-- get a connection to a backend
--
-- as long as we don't have enough connections in the pool, create new connections
--
function connect_server()
local is_debug = proxy.global.config.rwsplit.is_debug
-- make sure that we connect to each backend at least ones to
-- keep the connections to the servers alive
--
-- on read_query we can switch the backends again to another backend
if is_debug then
print()
print("[connect_server] " .. proxy.connection.client.src.name)
end
local rw_ndx = 0
-- init all backends
for i = 1, #proxy.global.backends do
local s = proxy.global.backends[i]
local pool = s.pool -- we don't have a username yet, try to find a connections which is idling
local cur_idle = pool.users[""].cur_idle_connections
pool.min_idle_connections = proxy.global.config.rwsplit.min_idle_connections
pool.max_idle_connections = proxy.global.config.rwsplit.max_idle_connections
if is_debug then
print(" [".. i .."].connected_clients = " .. s.connected_clients)
print(" [".. i .."].pool.cur_idle = " .. cur_idle)
print(" [".. i .."].pool.max_idle = " .. pool.max_idle_connections)
print(" [".. i .."].pool.min_idle = " .. pool.min_idle_connections)
print(" [".. i .."].type = " .. s.type)
print(" [".. i .."].state = " .. s.state)
end
-- prefer connections to the master
if s.type == proxy.BACKEND_TYPE_RW and
s.state ~= proxy.BACKEND_STATE_DOWN and
cur_idle < pool.min_idle_connections then
proxy.connection.backend_ndx = i
break
elseif s.type == proxy.BACKEND_TYPE_RO and
s.state ~= proxy.BACKEND_STATE_DOWN and
cur_idle < pool.min_idle_connections then
proxy.connection.backend_ndx = i
break
elseif s.type == proxy.BACKEND_TYPE_RW and
s.state ~= proxy.BACKEND_STATE_DOWN and
rw_ndx == 0 then
rw_ndx = i
end
end
if proxy.connection.backend_ndx == 0 then
if is_debug then
print(" [" .. rw_ndx .. "] taking master as default")
end
proxy.connection.backend_ndx = rw_ndx
end
-- pick a random backend
--
-- we someone have to skip DOWN backends
-- ok, did we got a backend ?
if proxy.connection.server then
if is_debug then
print(" using pooled connection from: " .. proxy.connection.backend_ndx)
end
-- stay with it
return proxy.PROXY_IGNORE_RESULT
end
if is_debug then
print(" [" .. proxy.connection.backend_ndx .. "] idle-conns below min-idle")
end
-- open a new connection
end
--用户帐号处理函数
function read_auth()
local c = proxy.connection.client
local s = proxy.connection.server
local password =assert(require("mysql.password"))
local proto = assert(require("mysql.proto"))
-- 用户配置文件需支持热更新，设置为反复加载
-- 虚拟用户列表
package.loaded["proxy.userlist"] = nil
local ud = require("proxy.userlist")
-- 直连用户列表
package.loaded["proxy.userpass"] = nil
local pd = require("proxy.userpass")
-- 直接用户配置
package.loaded["proxy.realuser"] = nil
local realuser = require("proxy.realuser")
local check = 0
for user, passwd in pairs(ud) do
if user == c.username and password.scramble(s.scramble_buffer, password.hash(passwd)) == c.scrambled_password then
check = 1
break
end
end
-- 检查跳过列表 即不使用虚拟帐号的
for user, passwd in pairs(pd) do
if user == c.username then
check = 2
break
end
end
if check == 0 then
proxy.response.type = proxy.MYSQLD_PACKET_ERR
proxy.response.errmsg ="error , code 111 !"
return proxy.PROXY_SEND_RESULT
end
--如果二级帐号授权成功 则把连接交给真实帐号
if check == 1 then
local protocol_41_default_capabilities = 8 + 512 + 32768
proxy.queries:append(1,
proto.to_response_packet({
username = realuser['username'],
response = password.scramble(s.scramble_buffer, password.hash(realuser['password'])),
charset = 8, -- default charset
database = c.default_db,
max_packet_size = 1 * 1024 * 1024,
server_capabilities=protocol_41_default_capabilities
})
)
return proxy.PROXY_SEND_QUERY
end
end
---
---
-- put the successfully authed connection into the connection pool
--
-- @param auth the context information for the auth
--
-- auth.packet is the packet
function read_auth_result( auth )
if is_debug then
print("[read_auth_result] " .. proxy.connection.client.src.name)
end
if auth.packet:byte() == proxy.MYSQLD_PACKET_OK then
-- auth was fine, disconnect from the server
proxy.connection.backend_ndx = 0
elseif auth.packet:byte() == proxy.MYSQLD_PACKET_EOF then
-- we received either a
--
-- * MYSQLD_PACKET_ERR and the auth failed or
-- * MYSQLD_PACKET_EOF which means a OLD PASSWORD (4.0) was sent
print("(read_auth_result) ... not ok yet");
elseif auth.packet:byte() == proxy.MYSQLD_PACKET_ERR then
-- auth failed
end
end
---
-- read/write splitting
function read_query( packet )
local is_debug = proxy.global.config.rwsplit.is_debug
local cmd = commands.parse(packet)
local c = proxy.connection.client
local r = auto_config.handle(cmd)
if r then return r end
local tokens
local norm_query
--记录SQL请求 用户和请求的语句
if cmd.type == proxy.COM_QUERY then
str_log("query.log","{user:\""..c.username.."\",query:\""..cmd.query.."\"}")
end
-- looks like we have to forward this statement to a backend
if is_debug then
print("[read_query] " .. proxy.connection.client.src.name)
print(" current backend = " .. proxy.connection.backend_ndx)
print(" client default db = " .. c.default_db)
print(" client username = " .. c.username)
if cmd.type == proxy.COM_QUERY then
print(" query = " .. cmd.query)
end
end
if cmd.type == proxy.COM_QUIT then
-- don't send COM_QUIT to the backend. We manage the connection
-- in all aspects.
proxy.response = {
type = proxy.MYSQLD_PACKET_OK,
}
if is_debug then
print(" (QUIT) current backend = " .. proxy.connection.backend_ndx)
end
return proxy.PROXY_SEND_RESULT
end
-- COM_BINLOG_DUMP packet can't be balanced
--
-- so we must send it always to the master
if cmd.type == proxy.COM_BINLOG_DUMP then
-- if we don't have a backend selected, let's pick the master
--
if proxy.connection.backend_ndx == 0 then
proxy.connection.backend_ndx = lb.idle_failsafe_rw()
end
return
end
proxy.queries:append(1, packet, { resultset_is_needed = true })
-- read/write splitting
--
-- send all non-transactional SELECTs to a slave
if not is_in_transaction and
cmd.type == proxy.COM_QUERY then
tokens = tokens or assert(tokenizer.tokenize(cmd.query))
local stmt = tokenizer.first_stmt_token(tokens)
if stmt.token_name == "TK_SQL_SELECT" then
is_in_select_calc_found_rows = false
local is_insert_id = false
for i = 1, #tokens do
local token = tokens[i]
-- SQL_CALC_FOUND_ROWS + FOUND_ROWS() have to be executed
-- on the same connection
-- print("token: " .. token.token_name)
-- print(" val: " .. token.text)
if not is_in_select_calc_found_rows and token.token_name == "TK_SQL_SQL_CALC_FOUND_ROWS" then
is_in_select_calc_found_rows = true
elseif not is_insert_id and token.token_name == "TK_LITERAL" then
local utext = token.text:upper()
if utext == "LAST_INSERT_ID" or
utext == "@@INSERT_ID" then
is_insert_id = true
end
end
-- we found the two special token, we can't find more
if is_insert_id and is_in_select_calc_found_rows then
break
end
end
-- if we ask for the last-insert-id we have to ask it on the original
-- connection
if not is_insert_id then
local backend_ndx = lb.idle_ro()
if backend_ndx > 0 then
proxy.connection.backend_ndx = backend_ndx
end
else
print(" found a SELECT LAST_INSERT_ID(), staying on the same backend")
end
end
end
-- no backend selected yet, pick a master
if proxy.connection.backend_ndx == 0 then
-- we don't have a backend right now
--
-- let's pick a master as a good default
--
proxy.connection.backend_ndx = lb.idle_failsafe_rw()
end
-- by now we should have a backend
--
-- in case the master is down, we have to close the client connections
-- otherwise we can go on
if proxy.connection.backend_ndx == 0 then
return proxy.PROXY_SEND_QUERY
end
local s = proxy.connection.server
-- if client and server db don't match, adjust the server-side
--
-- skip it if we send a INIT_DB anyway
if cmd.type ~= proxy.COM_INIT_DB and
c.default_db and c.default_db ~= s.default_db then
print(" server default db: " .. s.default_db)
print(" client default db: " .. c.default_db)
print(" syncronizing")
proxy.queries:prepend(2, string.char(proxy.COM_INIT_DB) .. c.default_db, { resultset_is_needed = true })
end
-- send to master
if is_debug then
if proxy.connection.backend_ndx > 0 then
local b = proxy.global.backends[proxy.connection.backend_ndx]
print(" sending to backend : " .. b.dst.name);
print(" is_slave : " .. tostring(b.type == proxy.BACKEND_TYPE_RO));
print(" server default db: " .. s.default_db)
print(" server username : " .. s.username)
end
print(" in_trans : " .. tostring(is_in_transaction))
print(" in_calc_found : " .. tostring(is_in_select_calc_found_rows))
print(" COM_QUERY : " .. tostring(cmd.type == proxy.COM_QUERY))
end
return proxy.PROXY_SEND_QUERY
end
function str_log(filename,str)
local filename= "/usr/local/mysql-proxy/logs/"..os.date("%Y-%m-%d", os.time())..filename
local file = io.open(filename,"a")
if file == nil then
print "file nil"
return
end
file:write(str .."\n")
file:flush()
file:close()
end
---
-- as long as we are in a transaction keep the connection
-- otherwise release it so another client can use it
function read_query_result( inj )
local is_debug = proxy.global.config.rwsplit.is_debug
local res = assert(inj.resultset)
local flags = res.flags
proxy.response.resultset = {fields = {}, rows = {}}
fn = 1
local rows = inj.resultset.rows
local fields = inj.resultset.fields
while fields[fn] do
table.insert(proxy.response.resultset.fields, {type = proxy.MYSQL_TYPE_STRING, name = fields[fn].name})
fn = fn + 1
end
fn = fn -1
-- 如果是不需要脱敏的帐号 则不脱敏
package.loaded["proxy.nomask"] = nil
local nm = require("proxy.nomask")
local c = proxy.connection.client
-- print ( 'result for user:'..c.username)
local need_mask = 1
for user, passwd in pairs(nm) do
if user == c.username then
need_mask = 0
break
end
end
for row in inj.resultset.rows do
if need_mask == 1 then
for i = 1, fn do
--if fields[i].table =="blog_contents" then
-- print (fields[i].name ..':'.. fields[i].type)
--end
--跳过text字段类型
--if row[i] ~= nil and fields[i].type ~= 252 then
--row[i] = string.gsub(row[i],"(%w*)(%w%w)(@)(%w%w)(%w*)","%1##%3##%5")
--row[i] = string.gsub(row[i],"1([3456789]\d{1})([3456789]\d{3})([3456789]\d{3})","1%1####%3")
--end
if row[i] ~= nil then
row[i] = string.gsub(row[i],'([1]%d%d)(%d%d%d%d)(%d%d%d%d)','%1####%3')
end
end
end
table.insert(proxy.response.resultset.rows,row)
end
proxy.response.type = proxy.MYSQLD_PACKET_OK
return proxy.PROXY_SEND_RESULT
--
--[[if inj.id ~= 1 then
-- ignore the result of the USE <default_db>
-- the DB might not exist on the backend, what do do ?
--
if inj.id == 2 then
-- the injected INIT_DB failed as the slave doesn't have this DB
-- or doesn't have permissions to read from it
if res.query_status == proxy.MYSQLD_PACKET_ERR then
proxy.queries:reset()
proxy.response = {
type = proxy.MYSQLD_PACKET_ERR,
errmsg = "can't change DB ".. proxy.connection.client.default_db ..
" to on slave " .. proxy.global.backends[proxy.connection.backend_ndx].dst.name
}
return proxy.PROXY_SEND_RESULT
end
end
return proxy.PROXY_IGNORE_RESULT
end
is_in_transaction = flags.in_trans
local have_last_insert_id = (res.insert_id and (res.insert_id > 0))
if not is_in_transaction and
not is_in_select_calc_found_rows and
not have_last_insert_id then
-- release the backend
proxy.connection.backend_ndx = 0
elseif is_debug then
print("(read_query_result) staying on the same backend")
print(" in_trans : " .. tostring(is_in_transaction))
print(" in_calc_found : " .. tostring(is_in_select_calc_found_rows))
print(" have_insert_id : " .. tostring(have_last_insert_id))
end--]]
end
---
-- close the connections if we have enough connections in the pool
--
-- @return nil - close connection
-- IGNORE_RESULT - store connection in the pool
function disconnect_client()
local is_debug = proxy.global.config.rwsplit.is_debug
if is_debug then
print("[disconnect_client] " .. proxy.connection.client.src.name)
end
-- make sure we are disconnection from the connection
-- to move the connection into the pool
proxy.connection.backend_ndx = 0
end