package config import ( "errors" "fmt" "github.com/cobaugh/osrelease" "github.com/creasty/defaults" "github.com/gbrlsnchs/jwt/v3" "go.uber.org/zap" "gopkg.in/yaml.v2" "io/ioutil" "os" "os/exec" "os/user" "path" "regexp" "strconv" "strings" "sync" ) const DefaultLocation = "/etc/pterodactyl/config.yml" type Configuration struct { sync.RWMutex `json:"-" yaml:"-"` // The location from which this configuration instance was instantiated. path string // Locker specific to writing the configuration to the disk, this happens // in areas that might already be locked so we don't want to crash the process. writeLock sync.Mutex // Determines if wings should be running in debug mode. This value is ignored // if the debug flag is passed through the command line arguments. Debug bool // A unique identifier for this node in the Panel. Uuid string // An identifier for the token which must be included in any requests to the panel // so that the token can be looked up correctly. AuthenticationTokenId string `json:"token_id" yaml:"token_id"` // The token used when performing operations. Requests to this instance must // validate against it. AuthenticationToken string `json:"token" yaml:"token"` Api ApiConfiguration `json:"api" yaml:"api"` System SystemConfiguration `json:"system" yaml:"system"` Docker DockerConfiguration `json:"docker" yaml:"docker"` // The amount of time in seconds that should elapse between disk usage checks // run by the daemon. Setting a higher number can result in better IO performance // at an increased risk of a malicious user creating a process that goes over // the assigned disk limits. DiskCheckTimeout int `yaml:"disk_check_timeout"` // Defines internal throttling configurations for server processes to prevent // someone from running an endless loop that spams data to logs. Throttles struct { // The number of data overage warnings (inclusive) that can accumulate // before a process is terminated. KillAtCount int `default:"5" yaml:"kill_at_count"` // The number of seconds that must elapse before the internal counter // begins decrementing warnings assigned to a process that is outputting // too much data. DecaySeconds int `default:"10" json:"decay" yaml:"decay"` // The total number of bytes allowed to be output by a server process // per interval. BytesPerInterval int `default:"4096" json:"bytes" yaml:"bytes"` // The amount of time that should lapse between data output throttle // checks. This should be defined in milliseconds. CheckInterval int `default:"100" yaml:"check_interval"` } // The location where the panel is running that this daemon should connect to // to collect data and send events. PanelLocation string `json:"remote" yaml:"remote"` } // Defines the configuration of the internal SFTP server. type SftpConfiguration struct { // If set to false, the internal SFTP server will not be booted and you will need // to run the SFTP server independent of this program. UseInternalSystem bool `default:"true" json:"use_internal" yaml:"use_internal"` // If set to true disk checking will not be performed. This will prevent the SFTP // server from checking the total size of a directory when uploading files. DisableDiskChecking bool `default:"false" yaml:"disable_disk_checking"` // The bind address of the SFTP server. Address string `default:"0.0.0.0" json:"bind_address" yaml:"bind_address"` // The bind port of the SFTP server. Port int `default:"2022" json:"bind_port" yaml:"bind_port"` // If set to true, no write actions will be allowed on the SFTP server. ReadOnly bool `default:"false" yaml:"read_only"` } // Defines the configuration for the internal API that is exposed by the // daemon webserver. type ApiConfiguration struct { // The interface that the internal webserver should bind to. Host string `default:"0.0.0.0" yaml:"host"` // The port that the internal webserver should bind to. Port int `default:"8080" yaml:"port"` // SSL configuration for the daemon. Ssl struct { Enabled bool `default:"false"` CertificateFile string `json:"cert" yaml:"cert"` KeyFile string `json:"key" yaml:"key"` } // The maximum size for files uploaded through the Panel in bytes. UploadLimit int `default:"100" json:"upload_limit" yaml:"upload_limit"` } // Reads the configuration from the provided file and returns the configuration // object that can then be used. func ReadConfiguration(path string) (*Configuration, error) { b, err := ioutil.ReadFile(path) if err != nil { return nil, err } c := new(Configuration) // Configures the default values for many of the configuration options present // in the structs. Values set in the configuration file take priority over the // default values. if err := defaults.Set(c); err != nil { return nil, err } // Track the location where we created this configuration. c.path = path // Replace environment variables within the configuration file with their // values from the host system. b = []byte(os.ExpandEnv(string(b))) if err := yaml.Unmarshal(b, c); err != nil { return nil, err } return c, nil } var Mutex sync.RWMutex var _config *Configuration var _jwtAlgo *jwt.HMACSHA var _debugViaFlag bool // Set the global configuration instance. This is a blocking operation such that // anything trying to set a different configuration value, or read the configuration // will be paused until it is complete. func Set(c *Configuration) { Mutex.Lock() if _config == nil || _config.AuthenticationToken != c.AuthenticationToken { _jwtAlgo = jwt.NewHS256([]byte(c.AuthenticationToken)) } _config = c Mutex.Unlock() } func SetDebugViaFlag(d bool) { _debugViaFlag = d } // Get the global configuration instance. This is a read-safe operation that will block // if the configuration is presently being modified. func Get() *Configuration { Mutex.RLock() defer Mutex.RUnlock() return _config } // Returns the in-memory JWT algorithm. func GetJwtAlgorithm() *jwt.HMACSHA { Mutex.RLock() defer Mutex.RUnlock() return _jwtAlgo } // Returns the path for this configuration file. func (c *Configuration) GetPath() string { return c.path } // Ensures that the Pterodactyl core user exists on the system. This user will be the // owner of all data in the root data directory and is used as the user within containers. // // If files are not owned by this user there will be issues with permissions on Docker // mount points. func (c *Configuration) EnsurePterodactylUser() (*user.User, error) { u, err := user.Lookup(c.System.Username) // If an error is returned but it isn't the unknown user error just abort // the process entirely. If we did find a user, return it immediately. if err == nil { return u, c.setSystemUser(u) } else if _, ok := err.(user.UnknownUserError); !ok { return nil, err } sysName, err := getSystemName() if err != nil { return nil, err } var command = fmt.Sprintf("useradd --system --no-create-home --shell /bin/false %s", c.System.Username) // Alpine Linux is the only OS we currently support that doesn't work with the useradd command, so // in those cases we just modify the command a bit to work as expected. if strings.HasPrefix(sysName, "alpine") { command = fmt.Sprintf("adduser -S -D -H -G %[1]s -s /bin/false %[1]s", c.System.Username) // We have to create the group first on Alpine, so do that here before continuing on // to the user creation process. if _, err := exec.Command("addgroup", "-S", c.System.Username).Output(); err != nil { return nil, err } } split := strings.Split(command, " ") if _, err := exec.Command(split[0], split[1:]...).Output(); err != nil { return nil, err } if u, err := user.Lookup(c.System.Username); err != nil { return nil, err } else { return u, c.setSystemUser(u) } } // Set the system user into the configuration and then write it to the disk so that // it is persisted on boot. func (c *Configuration) setSystemUser(u *user.User) error { uid, _ := strconv.Atoi(u.Uid) gid, _ := strconv.Atoi(u.Gid) c.Lock() defer c.Unlock() c.System.Username = u.Username c.System.User.Uid = uid c.System.User.Gid = gid return c.WriteToDisk() } // Ensures that the configured data directory has the correct permissions assigned to // all of the files and folders within. func (c *Configuration) EnsureFilePermissions() error { // Don't run this unless it is configured to be run. On large system this can often slow // things down dramatically during the boot process. if !c.System.SetPermissionsOnBoot { return nil } r := regexp.MustCompile("^[a-f0-9]{8}-[a-f0-9]{4}-4[a-f0-9]{3}-[89ab][a-f0-9]{3}-[a-f0-9]{12}$") files, err := ioutil.ReadDir(c.System.Data) if err != nil { return err } su, err := user.Lookup(c.System.Username) if err != nil { return err } wg := new(sync.WaitGroup) for _, file := range files { wg.Add(1) // Asynchronously run through the list of files and folders in the data directory. If // the item is not a folder, or is not a folder that matches the expected UUIDv4 format // skip over it. // // If we do have a positive match, run a chown against the directory. go func(f os.FileInfo) { defer wg.Done() if !f.IsDir() || !r.MatchString(f.Name()) { return } uid, _ := strconv.Atoi(su.Uid) gid, _ := strconv.Atoi(su.Gid) if err := os.Chown(path.Join(c.System.Data, f.Name()), uid, gid); err != nil { zap.S().Warnw("failed to chown server directory", zap.String("directory", f.Name()), zap.Error(err)) } }(file) } wg.Wait() return nil } // Writes the configuration to the disk as a blocking operation by obtaining an exclusive // lock on the file. This prevents something else from writing at the exact same time and // leading to bad data conditions. func (c *Configuration) WriteToDisk() error { ccopy := *c // If debugging is set with the flag, don't save that to the configuration file, otherwise // you'll always end up in debug mode. if _debugViaFlag { ccopy.Debug = false } if c.path == "" { return errors.New("cannot write configuration, no path defined in struct") } b, err := yaml.Marshal(&ccopy) if err != nil { return err } // Obtain an exclusive write against the configuration file. c.writeLock.Lock() defer c.writeLock.Unlock() if err := ioutil.WriteFile(c.GetPath(), b, 0644); err != nil { return err } return nil } // Gets the system release name. func getSystemName() (string, error) { // use osrelease to get release version and ID if release, err := osrelease.Read(); err != nil { return "", err } else { return release["ID"], nil } }