v2 init commit

src/mod/ganserv/authkey.go

@@ -0,0 +1,80 @@
+package ganserv
+
+import (
+	"errors"
+	"log"
+	"os"
+	"runtime"
+	"strings"
+)
+
+func TryLoadorAskUserForAuthkey() (string, error) {
+	//Check for zt auth token
+	value, exists := os.LookupEnv("ZT_AUTH")
+	if !exists {
+		log.Println("Environment variable ZT_AUTH not defined. Trying to load authtoken from file.")
+	} else {
+		return value, nil
+	}
+
+	authKey := ""
+	if runtime.GOOS == "windows" {
+		if isAdmin() {
+			//Read the secret file directly
+			b, err := os.ReadFile("C:\\ProgramData\\ZeroTier\\One\\authtoken.secret")
+			if err == nil {
+				log.Println("Zerotier authkey loaded")
+				authKey = string(b)
+			} else {
+				log.Println("Unable to read authkey at C:\\ProgramData\\ZeroTier\\One\\authtoken.secret: ", err.Error())
+			}
+		} else {
+			//Elavate the permission to admin
+			ak, err := readAuthTokenAsAdmin()
+			if err == nil {
+				log.Println("Zerotier authkey loaded")
+				authKey = ak
+			} else {
+				log.Println("Unable to read authkey at C:\\ProgramData\\ZeroTier\\One\\authtoken.secret: ", err.Error())
+			}
+		}
+
+	} else if runtime.GOOS == "linux" {
+		if isAdmin() {
+			//Try to read from source using sudo
+			ak, err := readAuthTokenAsAdmin()
+			if err == nil {
+				log.Println("Zerotier authkey loaded")
+				authKey = strings.TrimSpace(ak)
+			} else {
+				log.Println("Unable to read authkey at /var/lib/zerotier-one/authtoken.secret: ", err.Error())
+			}
+		} else {
+			//Try read from source
+			b, err := os.ReadFile("/var/lib/zerotier-one/authtoken.secret")
+			if err == nil {
+				log.Println("Zerotier authkey loaded")
+				authKey = string(b)
+			} else {
+				log.Println("Unable to read authkey at /var/lib/zerotier-one/authtoken.secret: ", err.Error())
+			}
+		}
+
+	} else if runtime.GOOS == "darwin" {
+		b, err := os.ReadFile("/Library/Application Support/ZeroTier/One/authtoken.secret")
+		if err == nil {
+			log.Println("Zerotier authkey loaded")
+			authKey = string(b)
+		} else {
+			log.Println("Unable to read authkey at /Library/Application Support/ZeroTier/One/authtoken.secret ", err.Error())
+		}
+	}
+
+	authKey = strings.TrimSpace(authKey)
+
+	if authKey == "" {
+		return "", errors.New("Unable to load authkey from file")
+	}
+
+	return authKey, nil
+}