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OpenGFW/docs/Analyzers.md
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# Analyzers
Analyzers are one of the main components of OpenGFW. Their job is to analyze a connection, see if it's a protocol they
support, and if so, extract information from that connection and provide properties for the rule engine to match against
user-provided rules. OpenGFW will automatically analyze which analyzers are referenced in the given rules and enable
only those that are needed.
This document lists the properties provided by each analyzer that can be used by rules.
## DNS (TCP & UDP)
For queries:
```json
{
"dns": {
"aa": false,
"id": 41953,
"opcode": 0,
"qr": false,
"questions": [
{
"class": 1,
"name": "www.google.com",
"type": 1
}
],
"ra": false,
"rcode": 0,
"rd": true,
"tc": false,
"z": 0
}
}
```
For responses:
```json
{
"dns": {
"aa": false,
"answers": [
{
"a": "142.251.32.36",
"class": 1,
"name": "www.google.com",
"ttl": 255,
"type": 1
}
],
"id": 41953,
"opcode": 0,
"qr": true,
"questions": [
{
"class": 1,
"name": "www.google.com",
"type": 1
}
],
"ra": true,
"rcode": 0,
"rd": true,
"tc": false,
"z": 0
}
}
```
Example for blocking DNS queries for `www.google.com`:
```yaml
- name: Block Google DNS
action: drop
expr: dns != nil && !dns.qr && any(dns.questions, {.name == "www.google.com"})
```
## FET (Fully Encrypted Traffic)
Check https://www.usenix.org/system/files/usenixsecurity23-wu-mingshi.pdf for more information.
```json
{
"fet": {
"ex1": 3.7560976,
"ex2": true,
"ex3": 0.9512195,
"ex4": 39,
"ex5": false,
"yes": false
}
}
```
Example for blocking fully encrypted traffic:
```yaml
- name: Block suspicious proxy traffic
action: block
expr: fet != nil && fet.yes
```
## HTTP
```json
{
"http": {
"req": {
"headers": {
"accept": "*/*",
"host": "ipinfo.io",
"user-agent": "curl/7.81.0"
},
"method": "GET",
"path": "/",
"version": "HTTP/1.1"
},
"resp": {
"headers": {
"access-control-allow-origin": "*",
"content-length": "333",
"content-type": "application/json; charset=utf-8",
"date": "Wed, 24 Jan 2024 05:41:44 GMT",
"referrer-policy": "strict-origin-when-cross-origin",
"server": "nginx/1.24.0",
"strict-transport-security": "max-age=2592000; includeSubDomains",
"via": "1.1 google",
"x-content-type-options": "nosniff",
"x-envoy-upstream-service-time": "2",
"x-frame-options": "SAMEORIGIN",
"x-xss-protection": "1; mode=block"
},
"status": 200,
"version": "HTTP/1.1"
}
}
}
```
Example for blocking HTTP requests to `ipinfo.io`:
```yaml
- name: Block ipinfo.io HTTP
action: block
expr: http != nil && http.req != nil && http.req.headers != nil && http.req.headers.host == "ipinfo.io"
```
## SSH
```json
{
"ssh": {
"server": {
"comments": "Ubuntu-3ubuntu0.6",
"protocol": "2.0",
"software": "OpenSSH_8.9p1"
},
"client": {
"comments": "IMHACKER",
"protocol": "2.0",
"software": "OpenSSH_8.9p1"
}
}
}
```
Example for blocking all SSH connections:
```yaml
- name: Block SSH
action: block
expr: ssh != nil
```
## TLS
```json
{
"tls": {
"req": {
"alpn": ["h2", "http/1.1"],
"ciphers": [
4866, 4867, 4865, 49196, 49200, 159, 52393, 52392, 52394, 49195, 49199,
158, 49188, 49192, 107, 49187, 49191, 103, 49162, 49172, 57, 49161,
49171, 51, 157, 156, 61, 60, 53, 47, 255
],
"compression": "AA==",
"random": "UqfPi+EmtMgusILrKcELvVWwpOdPSM/My09nPXl84dg=",
"session": "jCTrpAzHpwrfuYdYx4FEjZwbcQxCuZ52HGIoOcbw1vA=",
"sni": "ipinfo.io",
"supported_versions": [772, 771],
"version": 771,
"ech": true
},
"resp": {
"cipher": 4866,
"compression": 0,
"random": "R/Cy1m9pktuBMZQIHahD8Y83UWPRf8j8luwNQep9yJI=",
"session": "jCTrpAzHpwrfuYdYx4FEjZwbcQxCuZ52HGIoOcbw1vA=",
"supported_versions": 772,
"version": 771
}
}
}
```
Example for blocking TLS connections to `ipinfo.io`:
```yaml
- name: Block ipinfo.io TLS
action: block
expr: tls != nil && tls.req != nil && tls.req.sni == "ipinfo.io"
```
## QUIC
QUIC analyzer produces the same result format as TLS analyzer, but currently only supports "req" direction (client
hello), not "resp" (server hello).
```json
{
"quic": {
"req": {
"alpn": ["h3"],
"ciphers": [4865, 4866, 4867],
"compression": "AA==",
"ech": true,
"random": "FUYLceFReLJl9dRQ0HAus7fi2ZGuKIAApF4keeUqg00=",
"session": "",
"sni": "quic.rocks",
"supported_versions": [772],
"version": 771
}
}
}
```
Example for blocking QUIC connections to `quic.rocks`:
```yaml
- name: Block quic.rocks QUIC
action: block
expr: quic != nil && quic.req != nil && quic.req.sni == "quic.rocks"
```
## Trojan (proxy protocol)
```json
{
"trojan": {
"seq": [680, 4514, 293],
"yes": true
}
}
```
Example for blocking Trojan connections:
```yaml
- name: Block Trojan
action: block
expr: trojan != nil && trojan.yes
```
## SOCKS
SOCKS4:
```json
{
"socks": {
"version": 4,
"req": {
"cmd": 1,
"addr_type": 1, // same as socks5
"addr": "1.1.1.1",
// for socks4a
// "addr_type": 3,
// "addr": "google.com",
"port": 443,
"auth": {
"user_id": "user"
}
},
"resp": {
"rep": 90, // 0x5A(90) granted
"addr_type": 1,
"addr": "1.1.1.1",
"port": 443
}
}
}
```
SOCKS5 without auth:
```json
{
"socks": {
"version": 5,
"req": {
"cmd": 1, // 0x01: connect, 0x02: bind, 0x03: udp
"addr_type": 3, // 0x01: ipv4, 0x03: domain, 0x04: ipv6
"addr": "google.com",
"port": 80,
"auth": {
"method": 0 // 0x00: no auth, 0x02: username/password
}
},
"resp": {
"rep": 0, // 0x00: success
"addr_type": 1, // 0x01: ipv4, 0x03: domain, 0x04: ipv6
"addr": "198.18.1.31",
"port": 80,
"auth": {
"method": 0 // 0x00: no auth, 0x02: username/password
}
}
}
}
```
SOCKS5 with auth:
```json
{
"socks": {
"version": 5,
"req": {
"cmd": 1, // 0x01: connect, 0x02: bind, 0x03: udp
"addr_type": 3, // 0x01: ipv4, 0x03: domain, 0x04: ipv6
"addr": "google.com",
"port": 80,
"auth": {
"method": 2, // 0x00: no auth, 0x02: username/password
"username": "user",
"password": "pass"
}
},
"resp": {
"rep": 0, // 0x00: success
"addr_type": 1, // 0x01: ipv4, 0x03: domain, 0x04: ipv6
"addr": "198.18.1.31",
"port": 80,
"auth": {
"method": 2, // 0x00: no auth, 0x02: username/password
"status": 0 // 0x00: success, 0x01: failure
}
}
}
}
```
Example for blocking connections to `google.com:80` and user `foobar`:
```yaml
- name: Block SOCKS google.com:80
action: block
expr: string(socks?.req?.addr) endsWith "google.com" && socks?.req?.port == 80
- name: Block SOCKS user foobar
action: block
expr: socks?.req?.auth?.method == 2 && socks?.req?.auth?.username == "foobar"
```
## WireGuard
```json
{
"wireguard": {
"message_type": 1, // 0x1: handshake_initiation, 0x2: handshake_response, 0x3: packet_cookie_reply, 0x4: packet_data
"handshake_initiation": {
"sender_index": 0x12345678
},
"handshake_response": {
"sender_index": 0x12345678,
"receiver_index": 0x87654321,
"receiver_index_matched": true
},
"packet_data": {
"receiver_index": 0x12345678,
"receiver_index_matched": true
},
"packet_cookie_reply": {
"receiver_index": 0x12345678,
"receiver_index_matched": true
}
}
}
```
Example for blocking WireGuard traffic:
```yaml
# false positive: high
- name: Block all WireGuard-like traffic
action: block
expr: wireguard != nil
# false positive: medium
- name: Block WireGuard by handshake_initiation
action: drop
expr: wireguard?.handshake_initiation != nil
# false positive: low
- name: Block WireGuard by handshake_response
action: drop
expr: wireguard?.handshake_response?.receiver_index_matched == true
# false positive: pretty low
- name: Block WireGuard by packet_data
action: block
expr: wireguard?.packet_data?.receiver_index_matched == true
```
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