Clash

A rule-based tunnel in Go.

Features

Local HTTP/HTTPS/SOCKS server with authentication support
Shadowsocks(R), VMess, VLESS, Trojan, Snell, WireGuard, SOCKS5, HTTP(S) outbound support
Built-in fake-ip DNS server that aims to minimize DNS pollution attack impact. DoH/DoT upstream supported.
Rules based off domains, GEOIP, GEOSITE, IP-CIDR or process names to route packets to different destinations
Proxy groups allow users to implement powerful rules. Supports automatic fallback, load balancing or auto select proxy based off latency
Remote providers, allowing users to get proxy lists remotely instead of hardcoding in config
Transparent proxy: Redirect TCP and TProxy TCP/UDP with automatic route table/rule management
Hot-reload via the comprehensive HTTP RESTful API controller
System/gVisor stack TUN device on macOS, Linux and Windows
Policy routing with Scripts

Getting Started

Documentations are available at GitHub Wiki.

Advanced usage for this branch

General configuration

sniffing: true # Sniff TLS SNI

force-cert-verify: true # force verify TLS Certificate, prevent machine-in-the-middle attacks

profile:
  tracing: false # prevent logs leak, default value is true

MITM configuration

A root CA certificate is required, the MITM proxy server will generate a CA certificate file and a CA private key file in your Clash home directory, you can use your own certificate replace it.

Need to install and trust the CA certificate on the client device, open this URL http://mitm.clash/cert.crt by the web browser to install the CA certificate, the host name 'mitm.clash' was always been hijacked.

NOTE: this feature cannot work on tls pinning

WARNING: DO NOT USE THIS FEATURE TO BREAK LOCAL LAWS

# Port of MITM proxy server on the local end
mitm-port: 7894

# Man-In-The-Middle attack
mitm:
  hosts: # use for others proxy type. E.g: TUN, socks
    - +.example.com
  rules: # rewrite rules
    - '^https?://www\.example\.com/1 url reject' # The "reject" returns HTTP status code 404 with no content.
    - '^https?://www\.example\.com/2 url reject-200' # The "reject-200" returns HTTP status code 200 with no content.
    - '^https?://www\.example\.com/3 url reject-img' # The "reject-img" returns HTTP status code 200 with content of 1px png.
    - '^https?://www\.example\.com/4 url reject-dict' # The "reject-dict" returns HTTP status code 200 with content of empty json object.
    - '^https?://www\.example\.com/5 url reject-array' # The "reject-array" returns HTTP status code 200 with content of empty json array.
    - '^https?://www\.example\.com/(6) url 302 https://www.example.com/new-$1'
    - '^https?://www\.(example)\.com/7 url 307 https://www.$1.com/new-7'
    - '^https?://www\.example\.com/8 url request-header (\r\n)User-Agent:.+(\r\n) request-header $1User-Agent: haha-wriohoh$2' # The "request-header" works for all the http headers not just one single header, so you can match two or more headers including CRLF in one regular expression.
    - '^https?://www\.example\.com/9 url request-body "pos_2":\[.*\],"pos_3" request-body "pos_2":[{"xx": "xx"}],"pos_3"'
    - '^https?://www\.example\.com/10 url response-header (\r\n)Tracecode:.+(\r\n) response-header $1Tracecode: 88888888888$2'
    - '^https?://www\.example\.com/11 url response-body "errmsg":"ok" response-body "errmsg":"not-ok"'

DNS configuration

Support resolve ip with a proxy tunnel or interface.

Support geosite with fallback-filter.

Use curl -X POST controllerip:port/cache/fakeip/flush to flush persistence fakeip

dns:
  enable: true
  use-hosts: true
  ipv6: false
  # remote-dns-resolve: true # remote resolve DNS on handle UDP session, default value is true
  enhanced-mode: fake-ip
  fake-ip-range: 198.18.0.1/16
  listen: 127.0.0.1:6868
  default-nameserver:
    - 119.29.29.29
    - 114.114.114.114
  nameserver:
    - https://doh.pub/dns-query
    - tls://223.5.5.5:853
  fallback:
    - 'tls://8.8.4.4:853#proxy or interface'
    - 'https://1.0.0.1/dns-query#Proxy'  # append the proxy adapter name to the end of DNS URL with '#' prefix.
  fallback-filter:
    geoip: false
    geosite:
      - gfw  # `geosite` filter only use fallback server to resolve ip, prevent DNS leaks to untrusted DNS providers.
    domain:
      - +.example.com
    ipcidr:
      - 0.0.0.0/32

TUN configuration

Simply add the following to the main configuration:

NOTE:

auto-route and auto-detect-interface only available on macOS, Windows and Linux, receive IPv4 traffic

tun:
  enable: true
  stack: system # or gvisor
  # device: tun://utun8 # or fd://xxx, it's optional
  # dns-hijack:
  #   - 8.8.8.8:53
  #   - tcp://8.8.8.8:53
  #   - any:53
  #   - tcp://any:53
  auto-route: true # auto set global route
  auto-detect-interface: true # conflict with interface-name

interface-name: en0

tun:
  enable: true
  stack: system # or gvisor
  # dns-hijack:
  #   - 8.8.8.8:53
  #   - tcp://8.8.8.8:53
  auto-route: true # auto set global route

It's recommended to use fake-ip mode for the DNS server.

Clash needs elevated permission to create TUN device:

$ sudo ./clash

Then manually create the default route and DNS server. If your device already has some TUN device, Clash TUN might not work. In this case, fake-ip-filter may helpful.

Enjoy! :)

For Windows:

tun:
  enable: true
  stack: gvisor # or system
  dns-hijack:
    - 198.18.0.2:53 # when `fake-ip-range` is 198.18.0.1/16, should hijack 198.18.0.2:53
  auto-route: true # auto set global route for Windows
  # It is recommended to use `interface-name`
  auto-detect-interface: true # auto detect interface, conflict with `interface-name`

Finally, open the Clash

Rules configuration

Support rule SCRIPT shortcuts.
Support rule GEOSITE.
Support rule USER-AGENT.
Support multiport condition for rule SRC-PORT and DST-PORT.
Support network condition for all rules.
Support process condition for all rules.
Support source IPCIDR condition for all rules, just append to the end.

The GEOIP databases via https://github.com/Loyalsoldier/geoip.

The GEOSITE databases via https://github.com/Loyalsoldier/v2ray-rules-dat.

mode: rule

script:
  shortcuts: # `src_port` and `dst_port` are number
    quic: 'network == "udp" and dst_port == 443'
    privacy: '"analytics" in host or "adservice" in host or "firebase" in host or "safebrowsing" in host or "doubleclick" in host'
    BilibiliUdp: |
      network == "udp" and match_provider("bilibili")
    ParentalControls: |
      src_ip == "192.168.1.123" and now.hour < 8 and now.hour > 22
rules:
  # rule SCRIPT shortcuts
  - SCRIPT,quic,REJECT # Disable QUIC
  - SCRIPT,privacy,REJECT
  - SCRIPT,BilibiliUdp,REJECT
  - SCRIPT,ParentalControls,REJECT

  # network condition for all rules
  - DOMAIN-SUFFIX,example.com,DIRECT,tcp
  - DOMAIN-SUFFIX,example.com,REJECT,udp

  # process condition for all rules (add 'P:' prefix)
  - DOMAIN-SUFFIX,example.com,REJECT,P:Google Chrome Helper

  # multiport condition for rules SRC-PORT and DST-PORT
  - DST-PORT,123/136/137-139,DIRECT,udp

  # USER-AGENT payload cannot include the comma character, '*' meaning any character.
  - USER-AGENT,*example*,PROXY

  # rule GEOSITE
  - GEOSITE,category-ads-all,REJECT
  - GEOSITE,icloud@cn,DIRECT
  - GEOSITE,apple@cn,DIRECT
  - GEOSITE,apple-cn,DIRECT
  - GEOSITE,microsoft@cn,DIRECT
  - GEOSITE,facebook,PROXY
  - GEOSITE,youtube,PROXY
  - GEOSITE,geolocation-cn,DIRECT
  - GEOSITE,geolocation-!cn,PROXY

  # source IPCIDR condition for all rules in gateway proxy
  #- GEOSITE,geolocation-!cn,REJECT,192.168.1.88/32,192.168.1.99/32
  
  - GEOIP,telegram,PROXY,no-resolve
  - GEOIP,lan,DIRECT,no-resolve
  - GEOIP,cn,DIRECT

  - MATCH,PROXY

Script shortcut parameters

now: {
  year:       int
  month:      int
  day:        int
  hour:       int
  minute:     int
  second:     int
}
type:            string
network:         string
host:            string
process_name:    string
process_path:    string
user_agent:      string
special_proxy:   string
src_ip:          string
src_port:        int
dst_ip:          string // call resolve_ip(host) if empty
dst_port:        int

Script shortcut functions

type resolve_ip = (host: string) => string // ip string
type in_cidr = (ip: string, cidr: string) => boolean // ip in cidr
type geoip = (ip: string) => string // country code
type match_provider = (name: string) => boolean // in rule provider
type resolve_process_name = () => string // process name
type resolve_process_path = () => string // process path

Script configuration

Script enables users to programmatically select a policy for the packets with more flexibility.

NOTE: If you want to use ctx.geoip(ip) you need to manually resolve ip first.

mode: script

script:
  # path: ./script.star
  code: |
    def main(ctx, metadata):
      processName = ctx.resolve_process_name(metadata)
      if processName == 'apsd':
        return "DIRECT"

      if metadata["network"] == 'udp' and metadata["dst_port"] == 443:
        return "REJECT"

      host = metadata["host"]
      for kw in ['analytics', 'adservice', 'firebase', 'bugly', 'safebrowsing', 'doubleclick']:
        if kw in host:
          return "REJECT"

      # now = time.now()
      # if (now.hour < 8 or now.hour > 18) and metadata["src_ip"] == '192.168.1.99':
      #   return "REJECT"

      if ctx.rule_providers["category-ads-all"].match(metadata):
        return "REJECT"

      if ctx.rule_providers["youtube"].match(metadata):
        ctx.log('[Script] domain %s matched youtube' % host)
        return "Proxy"

      if ctx.rule_providers["geolocation-cn"].match(metadata):
        ctx.log('[Script] domain %s matched geolocation-cn' % host)
        return "DIRECT"

      ip = metadata["dst_ip"]
      if ip == "":
        ip = ctx.resolve_ip(host)
        if ip == "":
          return "Proxy"

      code = ctx.geoip(ip)
      if code == "TELEGRAM":
        ctx.log('[Script] matched telegram')
        return "Proxy"

      if code == "CN" or code == "LAN" or code == "PRIVATE":
        return "DIRECT"

      return "Proxy" # default policy for requests which are not matched by any other script

the context and metadata

interface Metadata {
  type: string // socks5、http
  network: string // tcp、udp
  host: string
  user_agent: string
  special_proxy: string
  src_ip: string
  src_port: string
  dst_ip: string
  dst_port: string
}

interface Context {
  resolve_ip: (host: string) => string // ip string
  resolve_process_name: (metadata: Metadata) => string
  resolve_process_path: (metadata: Metadata) => string
  geoip: (ip: string) => string // country code
  log: (log: string) => void
  proxy_providers: Record<string, Array<{ name: string, alive: boolean, delay: number }>>
  rule_providers: Record<string, { match: (metadata: Metadata) => boolean }>
}

Proxies configuration

Support outbound protocol VLESS.

Support Trojan with XTLS.

Support userspace WireGuard outbound.

Support relay UDP traffic.

Support filtering proxy providers in proxy groups.

Support custom http request header, prefix name and V2Ray subscription URL in proxy providers.

proxies:
  # VLESS
  - name: "vless-tls"
    type: vless
    server: server
    port: 443
    uuid: uuid
    network: tcp
    servername: example.com
    udp: true
    # skip-cert-verify: true
  - name: "vless-xtls"
    type: vless
    server: server
    port: 443
    uuid: uuid
    network: tcp
    servername: example.com
    flow: xtls-rprx-direct # or xtls-rprx-origin
    # flow-show: true # print the XTLS direction log
    # udp: true
    # skip-cert-verify: true

  # Trojan
  - name: "trojan-xtls"
    type: trojan
    server: server
    port: 443
    password: yourpsk
    network: tcp
    flow: xtls-rprx-direct # or xtls-rprx-origin
    # flow-show: true # print the XTLS direction log
    # udp: true
    # sni: example.com # aka server name
    # skip-cert-verify: true
  
  # WireGuard
  - name: "wg"
    type: wireguard
    server: 127.0.0.1
    port: 443
    ip: 127.0.0.1
    # ipv6: your_ipv6
    private-key: eCtXsJZ27+4PbhDkHnB923tkUn2Gj59wZw5wFA75MnU=
    public-key: Cr8hWlKvtDt7nrvf+f0brNQQzabAqrjfBvas9pmowjo=
    # preshared-key: base64
    # remote-dns-resolve: true # remote resolve DNS with `dns` field, default is true
    # dns: [1.1.1.1, 8.8.8.8]
    # mtu: 1420
    udp: true

proxy-groups:
  # Relay chains the proxies. proxies shall not contain a relay.
  # Support relay UDP traffic.
  # Traffic: clash <-> ss1 <-> trojan <-> vmess <-> ss2 <-> Internet
  - name: "relay-udp-over-tcp"
    type: relay
    proxies:
      - ss1
      - trojan
      - vmess
      - ss2

  - name: "relay-raw-udp"
    type: relay
    proxies:
      - ss1
      - ss2
      - ss3
        
  - name: "filtering-proxy-providers"
    type: url-test
    url: "http://www.gstatic.com/generate_204"
    interval: 300
    tolerance: 200
    # lazy: true
    filter: "XXX" # a regular expression
    use:
      - provider1

proxy-providers:
  provider1:
    type: http
    url: "url" # support V2Ray subscription URL
    # url-proxy: true # forward to tun if tun enabled
    interval: 3600
    path: ./providers/provider1.yaml
    # filter: "xxx"
    # prefix-name: "XXX-"
    header:  # custom http request header
      User-Agent:
        - "Clash/v1.10.6"
    #   Accept:
    #     - 'application/vnd.github.v3.raw'
    #   Authorization:
    #     - ' token xxxxxxxxxxx'
    health-check:
      enable: false
      interval: 1200
      # lazy: false # default value is true
      url: http://www.gstatic.com/generate_204

Tunnels configuration

tunnels (like SSH local forwarding).

tunnels:
  # one line config
  - tcp/udp,127.0.0.1:6553,114.114.114.114:53,proxy
  - tcp,127.0.0.1:6666,rds.mysql.com:3306,vpn
  # full yaml config
  - network: [tcp, udp]
    address: 127.0.0.1:7777
    target: target.com
    proxy: proxy

eBPF

It requires Linux kernel version >= 4.5, support redirect-to-tun and auto-redir features.

redirect-to-tun:

only hook traffic of the egress NIC, conflict with auto-route and auto-redir.

interface-name: eth0

ebpf:
  redirect-to-tun:
    - eth0

tun:
  enable: true
  stack: system
  dns-hijack:
    - any:53
  auto-route: false

auto-redir:

only hook TCP traffic of the ingress NIC and conflict with redirect-to-tun, It can be replaced with redir-port (TCP) without any network config.

It's recommended to work with TUN to handle UDP traffic. It improves the network throughput performance of some low performance devices compared to using exclusively TUN.

interface-name: eth0

ebpf:
  auto-redir:
    - eth0
    # - wlan0

tun:
  enable: true
  stack: system
  dns-hijack:
    - any:53
  auto-route: true

Template

Normal, usually used as a local client.

Auto redirect, usually used as a transparent proxy gateway.

Redirect to tun, usually used as a transparent proxy gateway.

Daemon

For macOS.

For Linux.

For Windows.

Web GUI

Open the Dashboard online by click http://yacd.clash-plus.cf for local API by Safari or https://yacd.clash-plus.cf for local API by Chrome.

You can download the Dashboard into Clash home directory:

cd ~/.config/clash
curl -LJ https://github.com/yaling888/yacd/archive/gh-pages.zip -o yacd-gh-pages.zip
unzip yacd-gh-pages.zip
mv yacd-gh-pages dashboard

Add to config file:

external-controller: 127.0.0.1:9090
external-ui: dashboard

Open http://127.0.0.1:9090/ui/ by web browser.

Development

If you want to build an application that uses clash as a library, check out the the GitHub Wiki

Credits

License

This software is released under the GPL-3.0 license.

Grergo / clash-with-mitm