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docs: analyzers
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[![License][1]][2]
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[![License][1]][2]
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[1]: https://img.shields.io/badge/License-MPL_2.0-brightgreen.svg
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[1]: https://img.shields.io/badge/License-MPL_2.0-brightgreen.svg
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[2]: LICENSE
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[2]: LICENSE
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**[中文文档](README.zh.md)**
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**[中文文档](README.zh.md)**
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### Example rules
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### Example rules
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Documentation on all supported protocols and what field each one has is not yet ready. For now, you have to check the
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[Analyzer properties](docs/Analyzers.md)
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code under "analyzer" directory directly.
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For syntax of the expression language, please refer
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For syntax of the expression language, please refer
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to [Expr Language Definition](https://expr-lang.org/docs/language-definition).
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to [Expr Language Definition](https://expr-lang.org/docs/language-definition).
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[![License][1]][2]
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[![License][1]][2]
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[1]: https://img.shields.io/badge/License-MPL_2.0-brightgreen.svg
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[1]: https://img.shields.io/badge/License-MPL_2.0-brightgreen.svg
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[2]: LICENSE
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[2]: LICENSE
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OpenGFW 是一个 Linux 上灵活、易用、开源的 [GFW](https://zh.wikipedia.org/wiki/%E9%98%B2%E7%81%AB%E9%95%BF%E5%9F%8E)
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OpenGFW 是一个 Linux 上灵活、易用、开源的 [GFW](https://zh.wikipedia.org/wiki/%E9%98%B2%E7%81%AB%E9%95%BF%E5%9F%8E)
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### 样例规则
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### 样例规则
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关于规则具体支持哪些协议，以及每个协议包含哪些字段的文档还没有写。目前请直接参考 "analyzer" 目录下的代码。
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[解析器属性](docs/Analyzers.md)
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规则的语法请参考 [Expr Language Definition](https://expr-lang.org/docs/language-definition)。
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规则的语法请参考 [Expr Language Definition](https://expr-lang.org/docs/language-definition)。
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269
docs/Analyzers.md
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docs/Analyzers.md
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# Analyzers
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Analyzers are one of the main components of OpenGFW. Their job is to analyze a connection, see if it's a protocol they
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support, and if so, extract information from that connection and provide properties for the rule engine to match against
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user-provided rules. OpenGFW will automatically analyze which analyzers are referenced in the given rules and enable
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only those that are needed.
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This document lists the properties provided by each analyzer that can be used by rules.
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## DNS (TCP & UDP)
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For queries:
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```json
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{
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"dns": {
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"aa": false,
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"id": 41953,
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"opcode": 0,
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"qr": false,
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"questions": [
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{
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"class": 1,
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"name": "www.google.com",
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"type": 1
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}
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],
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"ra": false,
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"rcode": 0,
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"rd": true,
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"tc": false,
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"z": 0
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}
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}
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```
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For responses:
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```json
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{
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"dns": {
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"aa": false,
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"answers": [
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{
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"a": "142.251.32.36",
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"class": 1,
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"name": "www.google.com",
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"ttl": 255,
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"type": 1
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}
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],
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"id": 41953,
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"opcode": 0,
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"qr": true,
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"questions": [
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{
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"class": 1,
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"name": "www.google.com",
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"type": 1
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}
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],
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"ra": true,
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"rcode": 0,
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"rd": true,
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"tc": false,
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"z": 0
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}
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}
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```
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Example for blocking DNS queries for `www.google.com`:
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```yaml
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- name: Block Google DNS
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action: drop
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expr: dns != nil && !dns.qr && any(dns.questions, {.name == "www.google.com"})
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```
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## FET (Fully Encrypted Traffic)
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Check https://www.usenix.org/system/files/usenixsecurity23-wu-mingshi.pdf for more information.
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```json
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{
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"fet": {
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"ex1": 3.7560976,
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"ex2": true,
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"ex3": 0.9512195,
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"ex4": 39,
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"ex5": false,
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"yes": false
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}
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}
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```
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Example for blocking fully encrypted traffic:
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```yaml
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- name: Block suspicious proxy traffic
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action: block
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expr: fet != nil && fet.yes
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```
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## HTTP
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```json
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{
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"http": {
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"req": {
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"headers": {
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"accept": "*/*",
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"host": "ipinfo.io",
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"user-agent": "curl/7.81.0"
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},
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"method": "GET",
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"path": "/",
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"version": "HTTP/1.1"
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},
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"resp": {
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"headers": {
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"access-control-allow-origin": "*",
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"content-length": "333",
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"content-type": "application/json; charset=utf-8",
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"date": "Wed, 24 Jan 2024 05:41:44 GMT",
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"referrer-policy": "strict-origin-when-cross-origin",
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"server": "nginx/1.24.0",
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"strict-transport-security": "max-age=2592000; includeSubDomains",
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"via": "1.1 google",
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"x-content-type-options": "nosniff",
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"x-envoy-upstream-service-time": "2",
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"x-frame-options": "SAMEORIGIN",
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"x-xss-protection": "1; mode=block"
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},
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"status": 200,
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"version": "HTTP/1.1"
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}
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}
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}
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```
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Example for blocking HTTP requests to `ipinfo.io`:
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```yaml
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- name: Block ipinfo.io HTTP
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action: block
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expr: http != nil && http.req != nil && http.req.headers != nil && http.req.headers.host == "ipinfo.io"
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```
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## SSH
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```json
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{
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"ssh": {
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"server": {
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"comments": "Ubuntu-3ubuntu0.6",
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"protocol": "2.0",
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"software": "OpenSSH_8.9p1"
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},
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"client": {
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"comments": "IMHACKER",
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"protocol": "2.0",
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"software": "OpenSSH_8.9p1"
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}
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}
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}
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```
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Example for blocking all SSH connections:
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```yaml
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- name: Block SSH
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action: block
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expr: ssh != nil
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```
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## TLS
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```json
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{
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"tls": {
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"req": {
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"alpn": [
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"h2",
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"http/1.1"
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],
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"ciphers": [
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4866,
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4867,
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4865,
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49196,
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49200,
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159,
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52393,
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52392,
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52394,
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49195,
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49199,
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158,
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49188,
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49192,
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107,
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49187,
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49191,
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103,
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49162,
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49172,
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57,
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49161,
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49171,
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51,
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157,
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156,
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61,
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60,
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53,
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47,
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255
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],
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"compression": "AA==",
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"random": "UqfPi+EmtMgusILrKcELvVWwpOdPSM/My09nPXl84dg=",
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"session": "jCTrpAzHpwrfuYdYx4FEjZwbcQxCuZ52HGIoOcbw1vA=",
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"sni": "ipinfo.io",
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"supported_versions": [
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772,
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771
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],
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"version": 771
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},
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"resp": {
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"cipher": 4866,
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"compression": 0,
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"random": "R/Cy1m9pktuBMZQIHahD8Y83UWPRf8j8luwNQep9yJI=",
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"session": "jCTrpAzHpwrfuYdYx4FEjZwbcQxCuZ52HGIoOcbw1vA=",
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"supported_versions": 772,
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"version": 771
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}
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}
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}
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```
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Example for blocking TLS connections to `ipinfo.io`:
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```yaml
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- name: Block ipinfo.io TLS
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action: block
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expr: tls != nil && tls.req != nil && tls.req.sni == "ipinfo.io"
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```
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## Trojan (proxy protocol)
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Check https://github.com/XTLS/Trojan-killer for more information.
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```json
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{
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"trojan": {
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"down": 4712,
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"up": 671,
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"yes": true
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}
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}
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```
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Example for blocking Trojan connections:
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```yaml
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- name: Block Trojan
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action: block
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expr: trojan != nil && trojan.yes
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```
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