Trojan is a proxy server, client and protocol, designed to bypass the Great Firewall of China by imitating HTTPS. Trojan claims to be unidentifiable.
For the official Trojan implementation in C++, Install the trojan package or trojan-gitAUR for the development version. However the offical development has long been stalled. Various alternative implementations exist. For Trojan with features such as load balance, pipeline mode, and ICMP message proxy written in C++, install trojan-gitAUR. For Go implementation with features such as multiplexing, AEAD and routering based on destination IP, install trojan-go-binAUR or trojan-go-gitAUR. For Rust implementation with an emphasis on high performace and low memory usage, install trojan-r-gitAUR.
Trojan cannot run without proper configuration. It uses JSON as its configuration format. All configuration work is done in
/etc/trojan/. Detailed explanations of each field of the configuration file can be found on the GitHub repository.
Examples of configuration files are at
You will need to provide a TLS certificate and private key for Trojan servers to work. You can either apply for a free certificate with some automation tools like Acme.sh from Let's Encrypt or generate a self-signed one as shown in OpenSSL#Generate a self-signed certificate. Then, set the
key_password(not necessarily) fields in the configuration file accordingly. Note that you should pin the certificate by setting
cert on the client if you generate a self-signed certificate. Also, make sure that trojan on a server has enough permission to access the certificate and key file.
TCP Fast Open
For TCP Fast Open on servers to work, you will need to turn it on in your OS:
# echo 3 > /proc/sys/net/ipv4/tcp_fastopen
Trojan servers can be disguised as other services over TLS to prevent active probing. This can be done by, for example, running a web server with nginx and pointing
remote_port fields to the server address and port.
Trojan can be controlled with
trojan@.service. For example, start/enable the
email@example.com instance to run Trojan with the
/etc/trojan/conf.json configuration file. Trojan can be similarly ran with
/etc/trojan/config.json by starting/enabling
Trojan can also start in a shell, by running:
$ trojan /etc/trojan/config.json
You can replace
/etc/trojan/config.json with any other configuration files. Note that Trojan outputs its log to stderr, so you will have to redirect it to a file if you want to keep the log.