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194 lines
5.7 KiB
Markdown
194 lines
5.7 KiB
Markdown
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# Transparent Proxy with cgroup v2
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## Introduction
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cgproxy will transparent proxy anything running in specific cgroup. It resembles with *proxychains* and *tsock*, but without their disadvantages, and more powerfull.
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It aslo supports global transparent proxy and gateway proxy. See [Global transparent proxy](#global-transparent-proxy) and [Gateway proxy](#gateway-proxy)
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<!--ts-->
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* [Transparent Proxy with cgroup v2](#transparent-proxy-with-cgroup-v2)
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* [Introduction](#introduction)
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* [Prerequest](#prerequest)
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* [How to install](#how-to-install)
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* [How to use](#how-to-use)
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* [Global transparent proxy](#global-transparent-proxy)
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* [Gateway proxy](#gateway-proxy)
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* [Other useful tools provided in this project](#other-useful-tools-provided-in-this-project)
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* [NOTES](#notes)
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* [TIPS](#tips)
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* [Licences](#licences)
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<!-- Added by: fancy, at: Thu 23 Apr 2020 01:23:57 PM HKT -->
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<!--te-->
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## Prerequest
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- cgroup2
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Both cgroup and cgroup2 are enabled in linux by default. So you don't have to do anything about this.
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- `systemd-cgls` to see the cgroup hierarchical tree.
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- Why cgroup v2? Because simple, elegant and intuitive.
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- TPROXY
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A process listening on port (e.g. 12345) to accept iptables TPROXY, for example v2ray's dokodemo-door in tproxy mode.
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## How to install
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```bash
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mkdir build && cd build && cmake .. && make && sudo make install
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```
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- It is alreay in [archlinux AUR](https://aur.archlinux.org/packages/cgproxy/).
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- DEB and RPM are packaged in [release page](https://github.com/springzfx/cgproxy/releases).
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## How to use
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- First enable and start service
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```bash
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sudo systemctl enable --now cgproxy.service
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```
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- Then prefix with cgproxy with your command, just like proxychains
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```
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cgproxy <CMD>
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```
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- For example, test proxy
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```bash
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cgproxy curl -vIs https://www.google.com
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```
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- To completely stop
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```
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sudo systemctl disable --now cgproxy.service
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```
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----
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<details>
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<summary>More config in <i>/etc/cgproxy.conf</i> (click to expand)</summary>
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```bash
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########################################################################
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## cgroup transparent proxy
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## any process in cgroup_proxy will be proxied, and cgroup_noproxy the opposite
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## cgroup must start with slash '/'
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# cgroup_proxy="/"
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# cgroup_noproxy="/system.slice/v2ray.service"
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cgroup_proxy="/proxy.slice"
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cgroup_noproxy="/noproxy.slice"
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########################################################################
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## allow as gateway for local network
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enable_gateway=false
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########################################################################
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## listening port of another proxy process, for example v2ray
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port=12345
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########################################################################
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## if you set to false, it's traffic won't go through proxy, but still can go direct to internet
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enable_dns=true
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enable_tcp=true
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enable_udp=true
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enable_ipv4=true
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enable_ipv6=true
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########################################################################
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## do not modify this if you don't known what you are doing
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table=100
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fwmark=0x01
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mark_newin=0x02
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```
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</details>
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If you changed config, remember to restart service
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```bash
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sudo systemctl restart cgproxy.service
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```
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## Global transparent proxy
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- Set `cgroup_proxy="/"` in */etc/cgproxy.conf*, this will proxy all connection
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- And allow your proxy program (v2ray) direct to internet, two ways:
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- active way
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run `cgnoproxy <PROXY PROGRAM>`
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example: `cgnoproxy sudo v2ray -config config_file`
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- passive way
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set `cgroup_noproxy="<PROXY PROGRAM's CGROUP>"`
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example: `cgroup_noproxy="/system.slice/v2ray.service"`
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- Finally, restart cgproxy service, that's all
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## Gateway proxy
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- Set `enable_gateway=true` in */etc/cgproxy.conf*
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- And allow your proxy software (v2ray) direct to internet, described above
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- Other device set this host as gateway, and set public dns if necessary
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## Other useful tools provided in this project
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- `cgnoproxy` run program wihout proxy, very useful in global transparent proxy
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```bash
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cgnoproxy <CMD>
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```
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- `run_in_cgroup` run command in specific cgroup which will create if not exist , cgroup can be only one level down exist cgroup, otherwise created fail.
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```bash
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run_in_cgroup --cgroup=CGROUP <COMMAND>
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# example
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run_in_cgroup --cgroup=/mycgroup.slice ping 127.0.0.1
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```
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- `cgattach` attach specific process pid to specific cgroup which will create if not exist , cgroup can be only one level down exist cgroup, otherwise created fail.
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```bash
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cgattch <pid> <cgroup>
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# example
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cgattch 9999 /proxy.slice
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```
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## NOTES
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- `cgattach` has *suid* bit set by default, be careful to use on multi-user server for securiry. To avoid this situation, you can remove the *suid* bit , then it will fallback to use *sudo*, with *sudoer* you can restrict permission or set NOPASSWD for youself.
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- v2ray TPROXY need root or special permission
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```bash
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sudo setcap "cap_net_admin,cap_net_bind_service=ep" /usr/lib/v2ray/v2ray
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```
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- Why not outbound mark solution, because in v2ray [when `"localhost"` is used, out-going DNS traffic is not controlled by V2Ray](https://www.v2fly.org/en/configuration/dns.html), so no mark at all, that's pity.
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## TIPS
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- `systemd-cgls` to see the cgroup hierarchical tree.
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- Check cgroup2 support `findmnt -t cgroup2`
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- Offer you v2ray service and full config exmaple in [v2ray_config](https://github.com/springzfx/cgproxy/tree/master/v2ray_config)
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- Offer you qv2ray config example
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## Licences
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cgproxy is licenced under [](https://www.gnu.org/licenses/gpl-2.0)
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