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openwaf_rule_engine是OPENWAF的规则引擎 spread retract

https://github.com/titansec/OpenWAF

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README.md

Name

openwaf_rule_engine是OPENWAF的规则引擎

Table of Contents

Version

This document describes OpenWAF Rule Engine v0.0.1.161026_beta released on 26 Oct 2016.

Synopsis

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Description

规则引擎的启发来自modsecurityfreewaf(lua-resty-waf),将ModSecurity的规则机制用lua实现。基于规则引擎可以进行协议规范,自动工具,注入攻击,跨站攻击,信息泄露,异常请求等安全防护,支持动态添加规则,及时修补漏洞。

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Community

English Mailing List

The OpenWAF-en mailing list is for English speakers.

Chinese Mailing List

The OpenWAF-cn mailing list is for Chinese speakers.

Personal QQ Mail

290557551@qq.com

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Bugs and Patches

Please submit bug reports, wishlists, or patches by

  1. creating a ticket on the GitHub Issue Tracker,
  2. or posting to the TWAF community.

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Changes

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Modules Configuration Directives

    "twaf_secrules":{
        "state": true,                                              -- 总开关
        "reqbody_state": true,                                      -- 请求体检测开关
        "header_filter_state": true,                                -- 响应头检测开关
        "body_filter_state": true,                                  -- 响应体检测开关
        "system_rules_state": true,                                 -- 系统规则集检测开关
        "reqbody_limit":134217728,                                  -- 请求体检测阈值,大于阈值不检测
        "respbody_limit":524288,                                    -- 响应体检测阈值,大于阈值不检测
        "pre_path": "/opt/OpenWAF/",                                -- OpenWAF安装路径
        "path": "lib/twaf/inc/knowledge_db/twrules",                -- 特征规则库在OpenWAF中的路径
        "user_defined_rules":[ ],                                   -- 用户自定义规则,数组
        "rules_id":{                                                -- 特征排除
            "111112": [{"REMOTE_HOST":"a.com", "URI":"^/ab"}],      -- 匹配中数组中信息则对应规则失效,数组中key为变量名称,值支持正则
            "111113": {},                                           -- 特征未被排除
            "111114": [{}]                                          -- 特征被无条件排除
        }
    }

state

syntax: state true|false

default: true

context: twaf_secrules

规则引擎总开关

reqbody_state

syntax: reqbody_state true|false

default: true

context: twaf_secrules

请求体检测开关

header_filter_state

syntax: header_filter_state true|false

default: true

context: twaf_secrules

响应头检测开关

body_filter_state

syntax: body_filter_state true|false

default: false

context: twaf_secrules

响应体检测开关,默认关闭,若开启需添加第三方模块[ngx_http_twaf_header_sent_filter_module暂未开源]

system_rules_state

syntax: system_rules_state true|false

default: true

context: twaf_secrules

系统规则集检测开关

lib/twaf/inc/knowledge_db/twrules 目录下的规则,都是系统规则

除了系统规则外,还有 twaf_secrules 模块下 user_defined_rules 的用户自定义规则

系统规则一般很少改动,而用户自定义规则却随着业务而增减,如动态配置缓存、压缩、时域控制和黑白名单等。

reqbody_limit

syntax: reqbody_limit number

default: 134217728

context: twaf_secrules

请求体检测大小上限,默认134217728B(128MB),若请求体超过设置上限,则不检测

PS:reqbody_limit值要小于nginx中client_body_buffer_size的值才会生效

respbody_limit

syntax: respbody_limit number

default: 134217728

context: twaf_secrules

响应体检测大小上限,默认134217728B(128MB),若响应体大小超过设置上限,则不检测

pre_path

syntax: pre_path string

default: /opt/OpenWAF/

context: twaf_secrules

OpenWAF的安装路径

path

syntax: path string

default: lib/twaf/inc/knowledge_db/twrules

context: twaf_secrules

特征规则库在OpenWAF中的路径

user_defined_rules

syntax: user_defined_rules

default: []

context: twaf_secrules

策略下的用户自定义特征规则

先执行用户自定义规则,再执行系统规则

系统特征规则适用于所有的策略,在引擎启动时通过加载特征库或通过 API 加载系统特征规则,系统特征规则一般不会动态更改

用户自定义特征在策略下生效,一般用于变动较大的特征规则,如:时域控制,修改响应头等临时性规则

"user_defined_rules":[
    {
        "id": "1000001",
        "release_version": "858",
        "charactor_version": "001",
        "disable": false,
        "opts": {
            "nolog": false
        },
        "phase": "access",
        "action": "deny",
        "meta": 403,
        "severity": "high",
        "rule_name": "relative time",
        "desc": "周一至周五的8点至18点,禁止访问/test目录",
        "match": [{
            "vars": [{
                "var": "URI"
            }],
            "operator": "begins_with",
            "pattern": "/test"
        },
        {
            "vars": [{
                "var": "TIME_WDAY"
            }],
            "operator": "equal",
            "pattern": ["1", "2", "3", "4", "5"]
        },
        {
            "vars": [{
                "var": "TIME"
            }],
            "operator": "str_range",
            "pattern": ["08:00:00-18:00:00"]
        }]
    },
    {
        "id": "1000002",
        "release_version": "858",
        "charactor_version": "001",
        "disable": false,
        "opts": {
            "nolog": false
        },
        "phase": "access",
        "action": "deny",
        "meta": 403,
        "severity": "high",
        "rule_name": "iputil",
        "desc": "某ip段内不许访问",
        "match": [{
            "vars": [{
               "var": "REMOTE_ADDR"
            }],
            "operator": "ip_utils",
            "pattern": ["1.1.1.0/24","2.2.2.2-2.2.20.2"]
        }]
    }
]

rules_id

syntax: rules_id table

default: none

context: twaf_secrules

用于排除特征

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Rule Directives

-- lua格式
    {
        id = "xxxxxx",                             -- ID标识(唯一),string类型
        release_version = "858",                   -- 特征库版本,string类型
        charactor_version = "001",                 -- 特征规则版本,string类型
        severity = "low",                          -- 严重等级,OPENWAF中使用"low","medium","high"等,string类型
        rule_name = "test",                        -- 特征名称,string类型
        disable = false,                           -- 禁用此规则,boolean类型
        opts = {                                   -- 其余动作
            nolog = false,                         -- 不记日志,true or false,默认false
            add_resp_headers = {                   -- 自定义响应头
                key_xxx = "value_xxx"              -- 响应头名称 = 响应头值
            }
            setvar = {{                            -- 设置变量,数组
                column = "test",                   -- 变量的一级key,如:TX,session等,string类型
                key = "test",                      -- 变量的二级key,如:score, id等,string类型
                incr = true,                       -- 同modsec中的=+操作, true or false,默认false
                value = 5,                         -- 变量值,number类型
                time = 3000                        -- 超时时间(ms),number类型
            }}
        },
        phase = "test",                            -- 执行阶段("access","header_filter","body_filter"),支持数组和字符串
        action = "test",                           -- 动作,ALLOW,DENY等,string类型
        desc = "test",                             -- 描述语句
        tags = {"test1", "test2"},                 -- 标签
        match = {                                  -- 数组,match之间是“与”的关系,相当于modsecurity的action中chain的功能
            {
                vars = {{                          -- 数组,或的关系,取代modsec中的"|",处理多个变量,
                    var = "test",                  -- 变量名称,string类型
                    parse = {                      -- 对变量的解析,下面的操作只能出现一种
                        specific = "test",         -- 具体化,取代modsec中的":",支持数组,TODO:支持正则,如modsec的"/ /",支持字符串和数组
                        ignore = "test",           -- 忽略某个值,取代modsec中的"!",TODO:支持正则,如modsec的"/ /",支持字符串和数组
                        keys = true,               -- 取出所有的key
                        values = true,             -- 取出所有的value
                        all = true                 -- 取出所有的key和value
                    }
                }},
                transform = "test",                -- 转换操作,支持字符串和数组
                operator = "test",                 -- 操作,string类型
                pattern = "test",                  -- 操作参数,支持boolean、number、字符串和数组
                parse_pattern = true|false,        -- 是否解析pattern参数(目前不支持与pf组合),如pattern参数为"%{TX.1}"
                pf = "file_path",                  -- 操作参数,文件路径
                op_negated = true                  -- 操作取反,true or false,默认false
            },
            {match_info2},
            {match_info3},
            ....
        }
    }

--json格式
    {
        "id": "xxxxxx",
        "release_version": "858",
        "charactor_version": "001",
        "severity": "test",
        "rule_name": "test",
        "disable": false, 
        "opts": {
            "nolog": false,
            "add_resp_headers": {
                "key_xxx": "value_xxx"
            },
            "setvar": [{
                "column":"test",
                "key":"test",
                "incr": true,
                "value": 5,
                "time":3000
            }]
        },
        "phase": "test",
        "action": "test",
        "desc": "test",
        "tags": ["test1", "test2"]
        "match": [
            {
                "vars": [{
                    "var": "test",
                    "storage": true,
                    "phase": "test",
                    "parse": {
                        "specific": "test",
                        "ignore": "test",
                        "keys": true,
                        "values": "test",
                        "all": "test"
                    }
                }],
                "transform": "test",
                "operator": "test",
                "pattern": "test",
                "parse_pattern": true|false,
                "pf": "file_path",
                "op_negated": true
            },
            {"match_info2"},
            {"match_info3"},
            ...
        ]
    }

Variables

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ARGS

table类型,所有的请求参数,包含ARGS_GET和ARGS_POST

例如:POST http://www.baidu.com?name=miracle&age=5

请求体为:time=123456&day=365

ARGS变量值为{"name": "miracle", "age": "5", "time": "123456", "day": "365"}

Back to Var

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ARGS_COMBINED_SIZE

number类型,请求参数总长度,只包含key和value的长度,不包含'&'或'='等符号

例如:GET http://www.baidu.com?name=miracle&age=5

ARGS_COMBINED_SIZE变量值为15,而不是18

Back to Var

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ARGS_GET

table类型,querystring参数

例如:GET http://www.baidu.com?name=miracle&age=5

ARGS_GET变量值为{"name": "miracle", "age": "5"}

Back to Var

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ARGS_GET_NAMES

table类型,querystring参数key值

例如:GET http://www.baidu.com?name=miracle&age=5

ARGS_GET_NAMES变量值为["name", "age"]

Back to Var

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ARGS_NAMES

table类型,querystring参数key值及post参数key值

例如:POST http://www.baidu.com?name=miracle&age=5

请求体为:time=123456&day=365

ARGS_NAMES变量值为["name", "age", "time", "day"]

Back to Var

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ARGS_POST

table类型,POST参数

例如:

POST http://www.baidu.com/login.html

请求体为:time=123456&day=365

ARGS_POST变量值为{"time": "123456", "day": "365"}

Back to Var

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ARGS_POST_NAMES

table类型,POST参数key值

例如:

POST http://www.baidu.com/login.html

请求体为:time=123456&day=365

ARGS_POST_NAMES变量值为["time", "day"]

Back to Var

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BYTES_IN

number类型,接收信息字节数

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CONNECTION_REQUESTS

number类型,当前连接中的请求数

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DURATION

string类型,处理事务用时时间,单位秒(s)

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FILES

table类型,从请求体中得到的原始文件名(带有文件后缀名)

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FILES_NAMES

table类型,上传文件名称(不带有后缀名)

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GEO

table类型,包含code3,code,id,continent,name等字段信息

Back to Var

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GEO_CODE3

string类型,3个字母长度的国家缩写

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GEO_CODE

string类型,2个字母长度的国家缩写

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GEO_ID

number类型,国家ID

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GEO_CONTINENT

string类型,国家所在大洲

Back to Var

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GEO_NAME

string类型,国家全称

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GZIP_RATIO

string类型,压缩比率

Back to Var

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HTTP_COOKIE

string类型,请求头中的cookie字段

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HTTP_HOST

string类型,请求头中的host字段值,既域名:端口(80缺省)

Back to Var

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HTTP_REFERER

string类型,请求头中的referer字段

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HTTP_USER_AGENT

string类型,请求头中的user-agent字段

Back to Var

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IP_VERSION

string类型,IPv4 or IPv6

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MATCHED_VAR

类型不定,当前匹配中的变量

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MATCHED_VARS

table类型,单条规则匹配中的所有变量

Back to Var

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MATCHED_VAR_NAME

string类型,当前匹配中的变量名称

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MATCHED_VARS_NAMES

table类型,单条规则匹配中的所有变量名称

Back to Var

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ORIGINAL_DST_ADDR

string类型,服务器地址,应用代理模式为WAF地址,透明模式为后端服务器地址

Back to Var

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ORIGINAL_DST_PORT

string类型,服务器端口号,应用代理模式为WAF端口号,透明模式为后端服务器端口号

Back to Var

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POLICYID

string类型,策略ID

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QUERY_STRING

string类型,未解码的请求参数

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RAW_HEADER

string类型,请求头信息,带请求行

Back to Var

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RAW_HEADER_TRUE

string类型,请求头信息,不带请求行

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REMOTE_ADDR

string类型,客户端地址

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REMOTE_HOST

string类型,域名

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REMOTE_PORT

number类型,端口号

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REMOTE_USER

string类型,用于身份验证的用户名

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REQUEST_BASENAME

string类型,请求的文件名

例如: GET http://www.baidu.com/test/login.php

REQUEST_BASENAME值为/login.php

Back to Var

Back to TOC

REQUEST_BODY

类型不定,请求体

Back to Var

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REQUEST_COOKIES

table类型,请求携带的cookie

Back to Var

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REQUEST_COOKIES_NAMES

table类型,请求携带cookie的名称

Back to Var

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REQUEST_FILENAME

string类型,relative request URL(相对请求路径)

例如: GET http://www.baidu.com/test/login.php

REQUEST_FILENAME值为/test/login.php

Back to Var

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REQUEST_HEADERS

table类型,请求头信息

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REQUEST_HEADERS_NAMES

table类型,请求头key值

Back to Var

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REQUEST_LINE

string类型,请求行

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REQUEST_METHOD

string类型,请求方法

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REQUEST_PROTOCOL

string类型,http请求协议,如: HTTP/1.1

Back to Var

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HTTP_VERSION

string类型,http请求协议版本,如: 1.1

Back to Var

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URI

string类型,请求路径,既不带域名,也不带参数

例如: GET http://www.baid.com/test/login.php?name=miracle

URI变量值为/test/login.php

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URL

string类型,统一资源定位符,SCHEME与HTTP_HOST与URI的拼接

例如: GET http://www.baid.com/test/login.php?name=miracle

URL变量值为http://www.baid.com/test/login.php

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REQUEST_URI

string类型,请求路径,带参数,但不带有域名

例如: GET http://www.baid.com/test/login.php?name=miracle

REQUEST_URI变量值为/test/login.php?name=miracle

Back to Var

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RESPONSE_BODY

string类型,响应体

Back to Var

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RESPONSE_HEADERS

table类型,响应头信息

Back to Var

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RESPONSE_STATUS

function类型,响应状态码

Back to Var

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SCHEME

string类型,http or https

例如:GET http://www.baidu.com/

SCHEME变量值为http

Back to Var

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SERVER_ADDR

string类型,服务器地址

Back to Var

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SERVER_NAME

string类型,服务器名称

Back to Var

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SERVER_PORT

number类型,服务器端口号

Back to Var

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SESSION

table类型,第三方模块lua-resty-session提供的变量

Back to Var

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SESSION_DATA

table类型,session信息,第三方模块lua-resty-session提供的变量

Back to Var

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TIME

string类型,hour:minute:second

Back to Var

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TIME_DAY

number类型,天(1-31)

Back to Var

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TIME_EPOCH

number类型,时间戳,seconds since 1970

Back to Var

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TIME_HOUR

number类型,小时(0-23)

Back to Var

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TIME_MIN

number类型,分钟(0-59)

Back to Var

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TIME_MON

number类型,月份(1-12)

Back to Var

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TIME_SEC

number类型,秒(0-59)

Back to Var

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TIME_WDAY

number类型,周(0-6)

Back to Var

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TIME_YEAR

number类型,年份,four-digit,例如: 1997

Back to Var

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TIME_LOCAL

string类型,当前时间,例如: 26/Aug/2016:01:32:16 -0400

Back to Var

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TX

table类型,用于存储当前请求信息的变量,作用域仅仅是当前请求

Back to Var

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UNIQUE_ID

string类型,ID标识,随机生成的字符串,可通过配置来控制随机字符串的长度

Back to Var

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UPSTREAM_CACHE_STATUS

keeps the status of accessing a response cache (0.8.3). The status can be either “MISS”, “BYPASS”, “EXPIRED”, “STALE”, “UPDATING”, “REVALIDATED”, or “HIT”.

Back to Var

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USERID

string类型,从接入规则配置得到的用于ID标识

Back to Var

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Transformation Functions

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base64_decode

Decodes a Base64-encoded string.

Note: 注意transform的执行顺序

例如:
{
   "id": "xxxx",
   ...
   "transform": ["base64_decode", "lowercase"],
   ...
}

先执行base64解码,然后字符串最小化,若顺序调换,会影响结果

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sql_hex_decode

Decode sql hex data.

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base64_encode

Encodes input string using Base64 encoding.

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counter

计数,相当于modsecurity中的'&'符号

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compress_whitespace

Converts any of the whitespace characters (0x20, \f, \t, \n, \r, \v, 0xa0) to spaces (ASCII 0x20), compressing multiple consecutive space characters into one.

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hex_decode

Decodes a string that has been encoded using the same algorithm as the one used in hexEncode

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hex_encode

Encodes string (possibly containing binary characters) by replacing each input byte with two hexadecimal characters.

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html_decode

Decodes the characters encoded as HTML entities.

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length

Looks up the length of the input string in bytes

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lowercase

Converts all characters to lowercase

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md5

Calculates an MD5 hash from the data in input. The computed hash is in a raw binary form and may need encoded into text to be printed (or logged). Hash functions are commonly used in combination with hex_encode (for example: "transform": ["md5", "hex_encode").

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normalise_path

Removes multiple slashes, directory self-references, and directory back-references (except when at the beginning of the input) from input string.

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remove_nulls

Removes all NUL bytes from input

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remove_whitespace

Removes all whitespace characters from input.

移除空白字符\s,包含水平定位字符 ('\t')、归位键('\r')、换行('\n')、垂直定位字符('\v')或翻页('\f')等

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replace_comments

用一个空格代替/.../注释内容

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remove_comments_char

Removes common comments chars (/*, */, --, #).

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remove_comments

去掉/.../注释内容

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uri_decode

Unescape str as an escaped URI component.

例如: 
"b%20r56+7" 使用uri_decode转换后为 b r56 7

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uri_encode

Escape str as a URI component.

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sha1

Calculates a SHA1 hash from the input string. The computed hash is in a raw binary form and may need encoded into text to be printed (or logged). Hash functions are commonly used in combination with hex_encode (for example, "transform": ["sha1", "hex_encode"]).

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trim_left

Removes whitespace from the left side of the input string.

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trim_right

Removes whitespace from the right side of the input string.

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trim

Removes whitespace from both the left and right sides of the input string.

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Operators

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begins_with

Returns true if the parameter string is found at the beginning of the input.

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contains

Returns true if the parameter string is found anywhere in the input.

operator为contains且pattern为数组,相当于modsecurity的pm

PS: modsecurity的pm忽略大小写,OpenWAF中contains不忽略大小写

例如:
{
    "id": "xxx",
    ...
    "operator": "contains",
    "pattern": ["abc", "def"],
    ...
}

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contains_word

Returns true if the parameter string (with word boundaries) is found anywhere in the input.

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detect_sqli

This operator uses LibInjection to detect SQLi attacks.

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detect_xss

This operator uses LibInjection to detect XSS attacks.

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ends_with

Returns true if the parameter string is found at the end of the input.

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equal

Performs a string comparison and returns true if the parameter string is identical to the input string.

相当于modsecurity的eq和streq

例如:
{
    "id": "xxx",
    ...
    "operator": "equal",
    "pattern": [12345, "html", "23456"]
    ...
}

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greater_eq

Performs numerical comparison and returns true if the input value is greater than or equal to the provided parameter.

return false, if a value is provided that cannot be converted to a number.

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greater

Performs numerical comparison and returns true if the input value is greater than the operator parameter.

return false, if a value is provided that cannot be converted to a number.

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ip_utils

Performs a fast ipv4 or ipv6 match of REMOTE_ADDR variable data. Can handle the following formats:

Full IPv4 Address: 192.168.1.100 Network Block/CIDR Address: 192.168.1.0/24 IPv4 Address Region: 1.1.1.1-2.2.2.2

ip_utils与pf的组合相当于modsecurity中的ipMatchF和ipMatchFromFile

例如:
规则如下:
{
    "id": "xxxx",
    ...
    "operator": "ip_utils",
    "pf": "/tmp/ip_blacklist.txt",
    ...
}
"/tmp/ip_blacklist.txt"文件内容如下:
192.168.1.100
192.168.1.0/24
1.1.1.1-2.2.2.2

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less_eq

Performs numerical comparison and returns true if the input value is less than or equal to the operator parameter.

return false, if a value is provided that cannot be converted to a number.

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less

Performs numerical comparison and returns true if the input value is less than to the operator parameter.

return false, if a value is provided that cannot be converted to a number.

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pf

pattern是operator操作的参数

pf是指pattern from file,与pattern互斥(二者不可同时出现),目前仅支持绝对路径

pf与contains组合,相当于modsecurity的pmf或pmFromFile

pf与ip_utils组合,相当于modsecurity的ipMatchF或ipMatchFromFile

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regex

Performs a regular expression match of the pattern provided as parameter.

regex还有modecurity的capture捕获功能

modsecurity有关capture的描述如下: When used together with the regular expression operator (@rx), the capture action will create copies of the regular expression captures and place them into the transaction variable collection.

OpenWAF中无capture指令,但使用regex默认开启capture功能

例如:
{
    "id": "000031",
    "release_version": "858",
    "charactor_version": "001",
    "opts": {
        "nolog": false
    },
    "phase": "access",
    "action": "deny",
    "meta": 403,
    "severity": "low",
    "rule_name": "protocol.reqHeader.c",
    "desc": "协议规范性约束,检测含有不合规Range或Request-Range值的HTTP请求",
    "match": [
        {
            "vars": [
                {
                    "var": "REQUEST_HEADERS",
                    "parse": {
                        "specific": "Range"
                    }
                },
                {
                    "var": "REQUEST_HEADERS",
                    "parse": {
                        "specific": "Request-Range"
                    }
                }
            ],
            "operator": "regex",
            "pattern": "(\\d+)\\-(\\d+)\\,"
        },
        {
            "vars": [{
                "var": "TX",
                "parse": {
                    "specific": "2"
                }
            }],
            "operator": "greater_eq",
            "pattern": "%{TX.1}",
            "parse_pattern": true,
            "op_negated": true
        }
    ]
}

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str_match

等同于contains

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validate_url_encoding

Validates the URL-encoded characters in the provided input string.

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num_range

判断是否在数字范围内

它与transform的length组合,相当于modsecurity的validateByteRange

{
    "id": "xxx",
    ...
    "operator": "num_range",
    "pattern": [10, "13", "32-126"],
    "transform": "length",
    ...
}

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str_range

判断是否在字符串范围内

例如时间区间判断:
{
    "id": "xxx",
    ...
    "operator": "str_range",
    "pattern": ["01:42:00-04:32:00"],
    ...
}

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Others

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allow

Stops rule processing of the current phase on a successful match and allows the transaction to proceed.

"action": "allow"

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deny

Stops rule processing and intercepts transaction.

"action": "deny",
"meta": 403

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id

Stops rule processing and intercepts transaction.

"id": "xxxxxxx"

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nolog

不记录日志

"opts": {
    "nolog": true
}

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op_negated

对operator结果的取反

"match": [{
    "vars": [{
        "var": "HTTP_USER_AGENT"
    }],
    "transform": "length",
    "operator": "less_eq",
    "pattern": 50,
    "op_negated": true
}]

等价于

"match": [{
    "vars": [{
        "var": "HTTP_USER_AGENT"
    }],
    "transform": "length",
    "operator": "greater",
    "pattern": 50
}]

若请求头中user_agent字段长度大于50,则匹配中此条规则

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parse

对变量进一步解析

若请求GET http://www.baidu.com?name=miracle&age=5

"match": [{
    "vars": [{
        "var": "ARGS_GET"
    }],
    ...
}]
得到的值为{"name": "miracle", "age": "5"}


"match": [{
    "vars": [{
        "var": "ARGS_GET",
        "parse": {
            "specific": "name"
        }
    }]
}]
得到的值为["miracle"]


"match": [{
    "vars": [{
        "var": "ARGS_GET",
        "parse": {
            "specific": ["name", "age"]
        }
    }]
}]
得到的值为["miracle", "5"]


"match": [{
    "vars": [{
        "var": "ARGS_GET",
        "parse": {
            "ignore": "name"
        }
    }]
}]
得到的值为{"age": "5"}


"match": [{
    "vars": [{
        "var": "ARGS_GET",
        "parse": {
            "ignore": ["name", "age"]
        }
    }]
}]
得到的值为[]


"match": [{
    "vars": [{
        "var": "ARGS_GET",
        "parse": {
            "keys": true
        }
    }]
}]
得到的值为["name", "age"]


"match": [{
    "vars": [{
        "var": "ARGS_GET",
        "parse": {
            "values": true
        }
    }]
}]
得到的值为["miracle", "5"]


"match": [{
    "vars": [{
        "var": "ARGS_GET",
        "parse": {
            "all": true
        }
    }]
}]
得到的值为["name", "age", "miracle", "5"]

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pass

Continues processing with the next rule in spite of a successful match.

"action": "pass"

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phase

规则执行的阶段,取值可为"access","header_filter","body_filter"的组合

{
    "id": "xxx_01",
    "phase": "access",
    ...
}
"xxx_01"规则在access阶段执行

{
    "id": "xxx_02",
    "phase": ["access", "header_filter"],
    ...
}
"xxx_02规则在access阶段和"header_filter"阶段各执行一次

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proxy_cache

{
    ...
    phase = "header_filter",         -- 缓存开关需在header_filter阶段配置
    action = "pass",                 -- 无需拦截请求
    opts = {
        nolog = true,                -- 不需记录日志
        proxy_cache = {
            state = true|false,      -- 缓存开关
            expired = 600            -- 缓存时长(单位秒),默认600秒
        }
    }
    ...
}

若state为true,且得到的缓存状态为"MISS"或"EXPIRED",则对响应内容进行缓存,同时设置缓存时长
若state为false,则清除对应缓存键的缓存(包含其缓存文件)

举例如下:

# nginx.conf 有关proxy cache 配置如下
http {
    proxy_cache_path  /opt/cache/OpenWAF-proxy levels=2:2 keys_zone=twaf_cache:101m max_size=100m use_temp_path=off;
    proxy_cache_key $host$uri;
    proxy_cache twaf_cache;
    proxy_ignore_headers X-Accel-Expires Cache-Control Set-Cookie;
    proxy_no_cache $twaf_cache_flag;
    
    server {
        set $twaf_cache_flag 1;         #默认不缓存
    }
}

# lua 格式 配置
{ 
    id = "test_x01",                      -- id 全局唯一
    opts = {
        nolog = true,
        proxy_cache = {
            state = true,
            expired = 300
        }
    },
    phase = "header_filter", 
    action = "pass",
    match = {{
        vars = {{
            var = "URI"
        },{
            var = "REQUEST_HEADERS",
            parse = {
                specific = "Referer"
            }
        }},
        operator = "equal",
        pattern = {"/xampp/", "%{SCHEME}://%{HTTP_HOST}/xampp/"},
        parse_pattern = true
    }}
}
此规则将缓存URI为'/xampp/'的页面,更新时间为300秒

若match中过滤条件为响应码,则相当于Nginx的proxy_cache_valid指令
若match中过滤条件为请求方法,则相当于Nginx的proxy_cache_methods指令
若macth中过滤条件为资源类型,则相当于Nginx的proxy_cache_content_type指令

PS: proxy_cache_content_type指令为官方指令,是miracle Qi修改Nginx源码扩展的功能

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redirect

"action": "redirect",
"meta": "/index.html"

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charactor_version

指定此条规则的版本,同modsecurity中Action的rev功能

"charactor_version": "001"

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severity

Assigns severity to the rule in which it is used.

The data below is used by the OWASP ModSecurity Core Rule Set (CRS):

EMERGENCY: is generated from correlation of anomaly scoring data where there is an inbound attack and an outbound leakage. ALERT: is generated from correlation where there is an inbound attack and an outbound application level error. CRITICAL: Anomaly Score of 5. Is the highest severity level possible without correlation. It is normally generated by the web attack rules (40 level files). ERROR: Error - Anomaly Score of 4. Is generated mostly from outbound leakage rules (50 level files). WARNING: Anomaly Score of 3. Is generated by malicious client rules (35 level files). NOTICE: Anomaly Score of 2. Is generated by the Protocol policy and anomaly files. INFO DEBUG

也可自定义严重等级,如:low,medium,high,critical等

"severity": "high"

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setvar

Creates, removes, or updates a variable.

{
    "id": "xxx_01",
    "opts":{
        "nolog": false,
        "setvar": [{
            "column": "TX",
            "key": "score",
            "value": 5,
            "incr": true
        }]
    },
    ...
}
"xxx_01"规则中,给变量TX中score成员的值加5,若TX中无score成员,则初始化为0,再加5

{
    "id": "xxx_02",
    "opts":{
        "nolog": false,
        "setvar": [{
            "column": "TX",
            "key": "score",
            "value": 5
        }]
    },
    ...
}

"xxx_02"规则中,给变量TX中score成员的值赋为5

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meta

"action"的附属信息

若"action"为"deny",则"meta"为响应码
"action": "deny",
"meta": 403

若"action"为"redirect",则"meta"为重定向地址
"action": "redirect",
"meta": "/index.html"

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transform

This action is used to specify the transformation pipeline to use to transform the value of each variable used in the rule before matching.

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tag

Assigns a tag (category) to a rule.

支持数组    "tag": ["xxx_1", "xxx_2"]
支持字符串  "tag": "xxx_3"

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release_version

规则集版本,等同于modsecurity中Action的ver功能

"release_version": "858"

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robot

人机识别

需提前配置人机识别模块配置,此功能暂未放开

"action": "robot"

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add_resp_headers

增删改响应头

例如隐藏server字段:
"opts": {
    "add"_resp_headers": {
        "server": ""
    }
}

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