private key

README.md

@@ -6,24 +6,23 @@ d2ray is a single Docker container that provides easy 5-minute setups and braind
 ## Quickstart
 1. You can start with the example `docker-compose.yml` from this repo.
 2. Adjust environment variables:
-    - `PORT`: the port Xray listens on.
-    - `TARGET_HOST`: the target host to redirect non proxy connections.
-    - `TARGET_PORT`: the target port to redirect non proxy connections.
-    - `TARGET_SNI`: comma separated list of the target website's SNIs.
-    - `USERS`: comma separated list of usernames that can access Xray.
-    - `LOG_LEVEL`: the verbosity of Xray logs. Default: `warn`.
+    - `PORT`: the port Xray listens on. `Optional, default = 443`.
+    - `TARGET_HOST`: the target host to redirect non proxy connections. `Required`.
+    - `TARGET_PORT`: the target port to redirect non proxy connections. `Optional, default = 443`.
+    - `TARGET_SNI`: comma separated list of the target website's SNIs. `Required`.
+    - `PRIVATE_KEY` : server's private key. `Optional`.
+    - `USERS`: comma separated list of usernames that can access Xray. `Required`.
+    - `LOG_LEVEL`: the verbosity of Xray logs. `Optional, default = warn`.
 3. `docker compose up -d`
 4. Test your connection.
 
 ## Docker Volume
-All d2ray logs and private/public key pairs are stored in `/etc/d2ray` in the container. You can mount an external folder to that location to persist settings. See the example `docker-compose.yml`.
+The logs and private key are stored in `/etc/d2ray` in the container. You can mount an external folder to that location to persist settings. Otherwise d2ray creates an anonymous Docker volume.
 
 ## Key Generation
-d2ray checks whether a key file exists at path `/etc/xray/certs/keys` and generates a new key pair if not found.
+If `PRIVATE_KEY` is provided, d2ray uses that key. Otherwise, d2ray generates a new key pair and persists it in `/etc/xray/certs/keys`. The corresponding public key is always printed to the container log (`docker logs`), which clients use to connect. 
 
-You can either supply a pre-generated private key using `xray x25519` or let d2ray generate one. The corresponding public key is printed to the container log (`docker logs`), which clients use to connect. 
-
-If you are generating the keys yourself, the key file must contain exactly the output of `xray x25519`.
+To make d2ray regenerate a new key pair, manually delete the key file `/etc/xray/certs/keys` from the mounted volume.
 
 ## How To Update?
 - `docker compose down`

docker-compose.yml

@@ -10,10 +10,11 @@ services:
       - 8443:8443
     environment:
       - PORT=8443
-      - TARGET_HOST=example.com
+      - TARGET_HOST=www.apple.com
       - TARGET_PORT=443
-      - TARGET_SNI=www.example.com,example.com
-      - USERS=exampleuser1,exampleuser2
+      - TARGET_SNI=www.apple.com,apple.com
+      - USERS=alice,bob,eve
+      - PRIVATE_KEY=KE5MCI5e395fub55O1lsNPzvWw9nNAyCaecRSp3BvHg # Do NOT use this random key
       - LOG_LEVEL=warn
     restart: unless-stopped
     networks:

opt/init.py

@@ -16,51 +16,76 @@ class d2args:
     target_host : str
     target_sni : str
     log_level : str
+    private_key : str
+    public_key : str
     users : list[str]
     def __init__(self) -> None:
-        self.port = 443
-        self.target_host = "localhost"
-        self.target_port = 443
-        self.target_sni = "localhost"
-        self.log_level = "warn"
-        self.users = [''.join(random.choices(string.ascii_uppercase + string.digits, k=24))]
+        self._from_env()
 
-    def from_env(self) -> None:
-        env = os.getenv("PORT")
-        if env != None:
-            self.port = int(env)
+    @staticmethod
+    def _get_env(name : str, default : str = None, required : bool = True) -> str:
+        env = os.getenv(name)
+        if env == None:
+            if required:
+                raise Exception(f"Missing environment variable \"{name}\".")
+            else:
+                return default
+        return env
 
-        env = os.getenv("TARGET_PORT")
-        if env != None:
-            self.target_port = int(env)  
-
-        env = os.getenv("TARGET_SNI")
-        if env != None:
-            self.target_sni = env.split(",")
+    @staticmethod
+    def _parse_xray_x25519_output(stdout : str) -> tuple[str, str]:
+        skey = None
+        pkey = None
+        lines = stdout.split("\n")
+        if len(lines) < 2:
+            raise Exception(f"Unknown Xray output format:\n\"{stdout}\"\n")
         
-        env = os.getenv("TARGET_HOST")
-        if env != None:
-            self.target_host = env
+        priv_key_hdr = "Private key: "
+        pub_key_hdr = "Public key: "
+        for line in lines:
+            if line.startswith(priv_key_hdr):
+                skey = line[len(priv_key_hdr):]
+            elif line.startswith(pub_key_hdr):
+                pkey = line[len(pub_key_hdr):]
+        if (skey == None) or (pkey == None):
+            raise Exception(f"Unable to extract private or public key from Xray output:\n\"{stdout}\"\n")
+        return (skey.strip(), pkey.strip())
 
-        env = os.getenv("LOG_LEVEL")
-        if env != None:
-            self.log_level = env        
+    def _from_env(self) -> None:
+        self.target_host = self._get_env("TARGET_HOST")
+        self.target_sni = self._get_env("TARGET_SNI").split(",")
+        self.users = self._get_env("USERS").split(",")
 
-        env = os.getenv("USERS")
-        if env != None:
-            self.users = env.split(",")
+        self.port = int(self._get_env("PORT", default="443", required=False))
+        self.target_port = int(self._get_env("TARGET_PORT", default="443", required=False))
+        self.log_level = self._get_env("LOG_LEVEL", default="warn", required=False)
 
-    def __str__(self):
+        self.private_key = self._get_env("PRIVATE_KEY", default=None, required=False)
+        if (self.private_key == None):
+            print(f"Private key not provided.", flush=True)
+            if not KEY_FILE.exists():
+                print(f"Key file {KEY_FILE} not found. Generating new keys...")
+                self.private_key, _ = self._parse_xray_x25519_output(subprocess.check_output(f"{XRAY_BIN} x25519", shell = True).decode())
+                with open(KEY_FILE, "w") as f:
+                    f.write(self.private_key)
+            else:
+                print(f"Reading from key file {KEY_FILE} ...")
+                with open(KEY_FILE, "r") as f:
+                   self.private_key = f.read().strip()
+
+        _ , self.public_key = self._parse_xray_x25519_output(subprocess.check_output(f"{XRAY_BIN} x25519 -i {self.private_key}", shell = True).decode())
+
+    def __str__(self) -> str:
         ret = (f"Port: {self.port}\n"
                f"Target Port: {self.target_port}\n"
                f"Target Host: {self.target_host}\n"
                f"Target SNI: {', '.join(self.target_sni)}\n"
                f"Log Level: {self.log_level}\n"
-               f"Users: {', '.join(self.users)}"
+               f"Users: {', '.join(self.users)}\n"
+               f"Public Key: {self.public_key}"
         )
         return ret
 
-
 def process_directory(path : str, vars : dict[str, str], delete_template : bool = True) -> None:
     for f in os.listdir(path):
         full_path = os.path.join(path, f)
@@ -81,7 +106,7 @@ def build_target_snis(snis : list[str]) -> str:
 def build_users_json(users: list[str]) -> str:
     return ', '.join(["{\"id\": \"" + item + "\", \"flow\": \"xtls-rprx-vision\"}" for item in users])
 
-def build_jinja_dict(args : d2args, skey : str) -> dict[str, str]:
+def build_jinja_dict(args : d2args) -> dict[str, str]:
     jinja_dict : dict[str,str] = dict()
     jinja_dict["PORT"] = str(args.port)
     
@@ -93,56 +118,21 @@ def build_jinja_dict(args : d2args, skey : str) -> dict[str, str]:
     jinja_dict["LOG_LEVEL"] = args.log_level
 
     jinja_dict["USERS"] = build_users_json(args.users)
-    jinja_dict["PRIVATE_KEY"] = skey
-
+    jinja_dict["PRIVATE_KEY"] = args.private_key
     return jinja_dict
 
-def parse_xray_x25519_output(stdout : str) -> tuple[str, str]:
-    skey = None
-    pkey = None
-    lines = stdout.split("\n")
-    if len(lines) < 2:
-        raise Exception(f"Unknown Xray output format:\n\"{stdout}\"\n")
-    
-    priv_key_hdr = "Private key: "
-    pub_key_hdr = "Public key: "
-    for line in lines:
-        if line.startswith(priv_key_hdr):
-            skey = line[len(priv_key_hdr):]
-        elif line.startswith(pub_key_hdr):
-            pkey = line[len(pub_key_hdr):]
-    if (skey == None) or (pkey == None):
-        raise Exception(f"Unable to extract private or public key from Xray output:\n\"{stdout}\"\n")
-    return (skey.strip(), pkey.strip())
 
 def main():
     print(f"Initializing d2ray...", flush=True)
     args = d2args()
-    args.from_env()
 
-    print(f"Checking key file...", flush=True)
-    if not KEY_FILE.exists():
-        print(f"Key file not found at {KEY_FILE}. Generating...")
-        out = subprocess.check_output(f"{XRAY_BIN} x25519", shell = True).decode()
-        with open(KEY_FILE, "w") as f:
-            f.write(out)
-    
-    with open(KEY_FILE, "r") as f:
-        out = f.read()
+    print(f"\nConfiguration:\n{str(args)}\n", flush=True)
 
-    print(f"Reading keys...", flush=True)
-    skey, pkey = parse_xray_x25519_output(out)
-
-    print(f"Verifying public key...", flush=True)
-    _, _pkey = parse_xray_x25519_output(subprocess.check_output(f"{XRAY_BIN} x25519 -i {skey}", shell = True).decode())
-    if (_pkey != pkey):
-        print(f"Unmatching public key: expected \"{_pkey}\" but key file provided \"{pkey}\". Please verify the key file.", flush=True)
-
-    print(f"\nConfigurations:\n{str(args)}\nPublic key: {pkey}\n", flush=True)
-
-    template = build_jinja_dict(args, skey)
+    template = build_jinja_dict(args)
 
     print(f"Processing config files...", flush=True)
     process_directory("/opt/xray", template)
 
+    print(f"Initialization completed.\n", flush=True)
+
 main()