683 lines
19 KiB
Go
683 lines
19 KiB
Go
package types
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import (
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"errors"
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"fmt"
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"io/fs"
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"net/netip"
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"net/url"
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"os"
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"strings"
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"time"
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"github.com/coreos/go-oidc/v3/oidc"
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"github.com/juanfont/headscale/hscontrol/util"
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"github.com/prometheus/common/model"
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"github.com/rs/zerolog"
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"github.com/rs/zerolog/log"
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"github.com/spf13/viper"
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"go4.org/netipx"
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"tailscale.com/net/tsaddr"
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"tailscale.com/tailcfg"
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"tailscale.com/types/dnstype"
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)
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const (
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defaultOIDCExpiryTime = 180 * 24 * time.Hour // 180 Days
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maxDuration time.Duration = 1<<63 - 1
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)
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var errOidcMutuallyExclusive = errors.New(
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"oidc_client_secret and oidc_client_secret_path are mutually exclusive",
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)
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// Config contains the initial Headscale configuration.
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type Config struct {
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ServerURL string
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Addr string
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MetricsAddr string
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GRPCAddr string
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GRPCAllowInsecure bool
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EphemeralNodeInactivityTimeout time.Duration
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NodeUpdateCheckInterval time.Duration
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IPPrefixes []netip.Prefix
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PrivateKeyPath string
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NoisePrivateKeyPath string
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BaseDomain string
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Log LogConfig
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DisableUpdateCheck bool
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DERP DERPConfig
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DBtype string
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DBpath string
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DBhost string
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DBport int
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DBname string
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DBuser string
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DBpass string
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DBssl string
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TLS TLSConfig
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ACMEURL string
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ACMEEmail string
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DNSConfig *tailcfg.DNSConfig
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UnixSocket string
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UnixSocketPermission fs.FileMode
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OIDC OIDCConfig
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LogTail LogTailConfig
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RandomizeClientPort bool
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CLI CLIConfig
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ACL ACLConfig
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}
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type TLSConfig struct {
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CertPath string
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KeyPath string
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LetsEncrypt LetsEncryptConfig
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}
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type LetsEncryptConfig struct {
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Listen string
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Hostname string
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CacheDir string
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ChallengeType string
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}
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type OIDCConfig struct {
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OnlyStartIfOIDCIsAvailable bool
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Issuer string
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ClientID string
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ClientSecret string
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Scope []string
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ExtraParams map[string]string
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AllowedDomains []string
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AllowedUsers []string
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AllowedGroups []string
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GroupsClaim string
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EmailClaim string
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UsernameClaim string
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StripEmaildomain bool
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UseUsernameClaim bool
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Expiry time.Duration
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UseExpiryFromToken bool
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}
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type DERPConfig struct {
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ServerEnabled bool
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ServerRegionID int
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ServerRegionCode string
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ServerRegionName string
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STUNAddr string
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URLs []url.URL
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Paths []string
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AutoUpdate bool
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UpdateFrequency time.Duration
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}
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type LogTailConfig struct {
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Enabled bool
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}
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type CLIConfig struct {
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Address string
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APIKey string
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Timeout time.Duration
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Insecure bool
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}
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type ACLConfig struct {
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PolicyPath string
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}
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type LogConfig struct {
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Format string
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Level zerolog.Level
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}
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func LoadConfig(path string, isFile bool) error {
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if isFile {
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viper.SetConfigFile(path)
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} else {
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viper.SetConfigName("config")
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if path == "" {
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viper.AddConfigPath("/etc/headscale/")
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viper.AddConfigPath("$HOME/.headscale")
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viper.AddConfigPath(".")
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} else {
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// For testing
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viper.AddConfigPath(path)
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}
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}
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viper.SetEnvPrefix("headscale")
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viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
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viper.AutomaticEnv()
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viper.SetDefault("tls_letsencrypt_cache_dir", "/var/www/.cache")
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viper.SetDefault("tls_letsencrypt_challenge_type", HTTP01ChallengeType)
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viper.SetDefault("log.level", "info")
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viper.SetDefault("log.format", TextLogFormat)
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viper.SetDefault("dns_config", nil)
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viper.SetDefault("dns_config.override_local_dns", true)
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viper.SetDefault("derp.server.enabled", false)
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viper.SetDefault("derp.server.stun.enabled", true)
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viper.SetDefault("unix_socket", "/var/run/headscale/headscale.sock")
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viper.SetDefault("unix_socket_permission", "0o770")
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viper.SetDefault("grpc_listen_addr", ":50443")
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viper.SetDefault("grpc_allow_insecure", false)
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viper.SetDefault("cli.timeout", "5s")
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viper.SetDefault("cli.insecure", false)
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viper.SetDefault("db_ssl", false)
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viper.SetDefault("oidc.scope", []string{oidc.ScopeOpenID, "profile", "email"})
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viper.SetDefault("oidc.strip_email_domain", true)
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viper.SetDefault("oidc.use_username_claim", false)
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viper.SetDefault("oidc.only_start_if_oidc_is_available", true)
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viper.SetDefault("oidc.expiry", "180d")
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viper.SetDefault("oidc.groups_claim", "groups")
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viper.SetDefault("oidc.email_claim", "email")
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viper.SetDefault("oidc.username_claim", "preferred_username")
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viper.SetDefault("oidc.use_expiry_from_token", false)
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viper.SetDefault("logtail.enabled", false)
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viper.SetDefault("randomize_client_port", false)
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viper.SetDefault("ephemeral_node_inactivity_timeout", "120s")
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viper.SetDefault("node_update_check_interval", "10s")
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if IsCLIConfigured() {
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return nil
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}
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if err := viper.ReadInConfig(); err != nil {
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log.Warn().Err(err).Msg("Failed to read configuration from disk")
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return fmt.Errorf("fatal error reading config file: %w", err)
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}
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// Collect any validation errors and return them all at once
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var errorText string
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if (viper.GetString("tls_letsencrypt_hostname") != "") &&
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((viper.GetString("tls_cert_path") != "") || (viper.GetString("tls_key_path") != "")) {
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errorText += "Fatal config error: set either tls_letsencrypt_hostname or tls_cert_path/tls_key_path, not both\n"
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}
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if !viper.IsSet("noise") || viper.GetString("noise.private_key_path") == "" {
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errorText += "Fatal config error: headscale now requires a new `noise.private_key_path` field in the config file for the Tailscale v2 protocol\n"
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}
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if (viper.GetString("tls_letsencrypt_hostname") != "") &&
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(viper.GetString("tls_letsencrypt_challenge_type") == TLSALPN01ChallengeType) &&
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(!strings.HasSuffix(viper.GetString("listen_addr"), ":443")) {
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// this is only a warning because there could be something sitting in front of headscale that redirects the traffic (e.g. an iptables rule)
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log.Warn().
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Msg("Warning: when using tls_letsencrypt_hostname with TLS-ALPN-01 as challenge type, headscale must be reachable on port 443, i.e. listen_addr should probably end in :443")
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}
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if (viper.GetString("tls_letsencrypt_challenge_type") != HTTP01ChallengeType) &&
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(viper.GetString("tls_letsencrypt_challenge_type") != TLSALPN01ChallengeType) {
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errorText += "Fatal config error: the only supported values for tls_letsencrypt_challenge_type are HTTP-01 and TLS-ALPN-01\n"
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}
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if !strings.HasPrefix(viper.GetString("server_url"), "http://") &&
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!strings.HasPrefix(viper.GetString("server_url"), "https://") {
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errorText += "Fatal config error: server_url must start with https:// or http://\n"
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}
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// Minimum inactivity time out is keepalive timeout (60s) plus a few seconds
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// to avoid races
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minInactivityTimeout, _ := time.ParseDuration("65s")
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if viper.GetDuration("ephemeral_node_inactivity_timeout") <= minInactivityTimeout {
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errorText += fmt.Sprintf(
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"Fatal config error: ephemeral_node_inactivity_timeout (%s) is set too low, must be more than %s",
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viper.GetString("ephemeral_node_inactivity_timeout"),
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minInactivityTimeout,
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)
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}
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maxNodeUpdateCheckInterval, _ := time.ParseDuration("60s")
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if viper.GetDuration("node_update_check_interval") > maxNodeUpdateCheckInterval {
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errorText += fmt.Sprintf(
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"Fatal config error: node_update_check_interval (%s) is set too high, must be less than %s",
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viper.GetString("node_update_check_interval"),
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maxNodeUpdateCheckInterval,
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)
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}
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if errorText != "" {
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//nolint
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return errors.New(strings.TrimSuffix(errorText, "\n"))
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} else {
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return nil
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}
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}
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func GetTLSConfig() TLSConfig {
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return TLSConfig{
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LetsEncrypt: LetsEncryptConfig{
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Hostname: viper.GetString("tls_letsencrypt_hostname"),
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Listen: viper.GetString("tls_letsencrypt_listen"),
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CacheDir: util.AbsolutePathFromConfigPath(
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viper.GetString("tls_letsencrypt_cache_dir"),
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),
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ChallengeType: viper.GetString("tls_letsencrypt_challenge_type"),
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},
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CertPath: util.AbsolutePathFromConfigPath(
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viper.GetString("tls_cert_path"),
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),
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KeyPath: util.AbsolutePathFromConfigPath(
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viper.GetString("tls_key_path"),
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),
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}
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}
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func GetDERPConfig() DERPConfig {
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serverEnabled := viper.GetBool("derp.server.enabled")
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serverRegionID := viper.GetInt("derp.server.region_id")
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serverRegionCode := viper.GetString("derp.server.region_code")
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serverRegionName := viper.GetString("derp.server.region_name")
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stunAddr := viper.GetString("derp.server.stun_listen_addr")
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if serverEnabled && stunAddr == "" {
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log.Fatal().
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Msg("derp.server.stun_listen_addr must be set if derp.server.enabled is true")
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}
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urlStrs := viper.GetStringSlice("derp.urls")
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urls := make([]url.URL, len(urlStrs))
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for index, urlStr := range urlStrs {
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urlAddr, err := url.Parse(urlStr)
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if err != nil {
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log.Error().
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Str("url", urlStr).
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Err(err).
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Msg("Failed to parse url, ignoring...")
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}
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urls[index] = *urlAddr
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}
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paths := viper.GetStringSlice("derp.paths")
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autoUpdate := viper.GetBool("derp.auto_update_enabled")
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updateFrequency := viper.GetDuration("derp.update_frequency")
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return DERPConfig{
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ServerEnabled: serverEnabled,
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ServerRegionID: serverRegionID,
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ServerRegionCode: serverRegionCode,
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ServerRegionName: serverRegionName,
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STUNAddr: stunAddr,
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URLs: urls,
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Paths: paths,
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AutoUpdate: autoUpdate,
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UpdateFrequency: updateFrequency,
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}
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}
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func GetLogTailConfig() LogTailConfig {
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enabled := viper.GetBool("logtail.enabled")
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return LogTailConfig{
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Enabled: enabled,
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}
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}
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func GetACLConfig() ACLConfig {
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policyPath := viper.GetString("acl_policy_path")
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return ACLConfig{
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PolicyPath: policyPath,
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}
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}
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func GetLogConfig() LogConfig {
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logLevelStr := viper.GetString("log.level")
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logLevel, err := zerolog.ParseLevel(logLevelStr)
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if err != nil {
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logLevel = zerolog.DebugLevel
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}
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logFormatOpt := viper.GetString("log.format")
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var logFormat string
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switch logFormatOpt {
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case "json":
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logFormat = JSONLogFormat
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case "text":
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logFormat = TextLogFormat
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case "":
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logFormat = TextLogFormat
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default:
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log.Error().
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Str("func", "GetLogConfig").
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Msgf("Could not parse log format: %s. Valid choices are 'json' or 'text'", logFormatOpt)
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}
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return LogConfig{
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Format: logFormat,
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Level: logLevel,
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}
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}
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func GetDNSConfig() (*tailcfg.DNSConfig, string) {
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if viper.IsSet("dns_config") {
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dnsConfig := &tailcfg.DNSConfig{}
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overrideLocalDNS := viper.GetBool("dns_config.override_local_dns")
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if viper.IsSet("dns_config.nameservers") {
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nameserversStr := viper.GetStringSlice("dns_config.nameservers")
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nameservers := []netip.Addr{}
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resolvers := []*dnstype.Resolver{}
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for _, nameserverStr := range nameserversStr {
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// Search for explicit DNS-over-HTTPS resolvers
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if strings.HasPrefix(nameserverStr, "https://") {
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resolvers = append(resolvers, &dnstype.Resolver{
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Addr: nameserverStr,
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})
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// This nameserver can not be parsed as an IP address
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continue
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}
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// Parse nameserver as a regular IP
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nameserver, err := netip.ParseAddr(nameserverStr)
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if err != nil {
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log.Error().
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Str("func", "getDNSConfig").
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Err(err).
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Msgf("Could not parse nameserver IP: %s", nameserverStr)
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}
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nameservers = append(nameservers, nameserver)
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resolvers = append(resolvers, &dnstype.Resolver{
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Addr: nameserver.String(),
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})
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}
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dnsConfig.Nameservers = nameservers
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if overrideLocalDNS {
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dnsConfig.Resolvers = resolvers
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} else {
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dnsConfig.FallbackResolvers = resolvers
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}
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}
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if viper.IsSet("dns_config.restricted_nameservers") {
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dnsConfig.Routes = make(map[string][]*dnstype.Resolver)
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domains := []string{}
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restrictedDNS := viper.GetStringMapStringSlice(
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"dns_config.restricted_nameservers",
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)
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for domain, restrictedNameservers := range restrictedDNS {
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restrictedResolvers := make(
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[]*dnstype.Resolver,
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len(restrictedNameservers),
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)
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for index, nameserverStr := range restrictedNameservers {
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nameserver, err := netip.ParseAddr(nameserverStr)
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if err != nil {
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log.Error().
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Str("func", "getDNSConfig").
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Err(err).
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Msgf("Could not parse restricted nameserver IP: %s", nameserverStr)
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}
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restrictedResolvers[index] = &dnstype.Resolver{
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Addr: nameserver.String(),
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}
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}
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dnsConfig.Routes[domain] = restrictedResolvers
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domains = append(domains, domain)
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}
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dnsConfig.Domains = domains
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}
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if viper.IsSet("dns_config.domains") {
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domains := viper.GetStringSlice("dns_config.domains")
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if len(dnsConfig.Resolvers) > 0 {
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dnsConfig.Domains = domains
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} else if domains != nil {
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log.Warn().
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Msg("Warning: dns_config.domains is set, but no nameservers are configured. Ignoring domains.")
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}
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}
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if viper.IsSet("dns_config.extra_records") {
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var extraRecords []tailcfg.DNSRecord
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err := viper.UnmarshalKey("dns_config.extra_records", &extraRecords)
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if err != nil {
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log.Error().
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Str("func", "getDNSConfig").
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Err(err).
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Msgf("Could not parse dns_config.extra_records")
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}
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dnsConfig.ExtraRecords = extraRecords
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}
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if viper.IsSet("dns_config.magic_dns") {
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dnsConfig.Proxied = viper.GetBool("dns_config.magic_dns")
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}
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var baseDomain string
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if viper.IsSet("dns_config.base_domain") {
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baseDomain = viper.GetString("dns_config.base_domain")
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} else {
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baseDomain = "headscale.net" // does not really matter when MagicDNS is not enabled
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}
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log.Trace().Interface("dns_config", dnsConfig).Msg("DNS configuration loaded")
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return dnsConfig, baseDomain
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}
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return nil, ""
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}
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func GetHeadscaleConfig() (*Config, error) {
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if IsCLIConfigured() {
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return &Config{
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CLI: CLIConfig{
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Address: viper.GetString("cli.address"),
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APIKey: viper.GetString("cli.api_key"),
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Timeout: viper.GetDuration("cli.timeout"),
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Insecure: viper.GetBool("cli.insecure"),
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},
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}, nil
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}
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dnsConfig, baseDomain := GetDNSConfig()
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derpConfig := GetDERPConfig()
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logConfig := GetLogTailConfig()
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randomizeClientPort := viper.GetBool("randomize_client_port")
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configuredPrefixes := viper.GetStringSlice("ip_prefixes")
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parsedPrefixes := make([]netip.Prefix, 0, len(configuredPrefixes)+1)
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for i, prefixInConfig := range configuredPrefixes {
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prefix, err := netip.ParsePrefix(prefixInConfig)
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if err != nil {
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panic(fmt.Errorf("failed to parse ip_prefixes[%d]: %w", i, err))
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}
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if prefix.Addr().Is4() {
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builder := netipx.IPSetBuilder{}
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builder.AddPrefix(tsaddr.CGNATRange())
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ipSet, _ := builder.IPSet()
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if !ipSet.ContainsPrefix(prefix) {
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log.Warn().
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Msgf("Prefix %s is not in the %s range. This is an unsupported configuration.",
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prefixInConfig, tsaddr.CGNATRange())
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}
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}
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if prefix.Addr().Is6() {
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builder := netipx.IPSetBuilder{}
|
|
builder.AddPrefix(tsaddr.TailscaleULARange())
|
|
ipSet, _ := builder.IPSet()
|
|
if !ipSet.ContainsPrefix(prefix) {
|
|
log.Warn().
|
|
Msgf("Prefix %s is not in the %s range. This is an unsupported configuration.",
|
|
prefixInConfig, tsaddr.TailscaleULARange())
|
|
}
|
|
}
|
|
|
|
parsedPrefixes = append(parsedPrefixes, prefix)
|
|
}
|
|
|
|
prefixes := make([]netip.Prefix, 0, len(parsedPrefixes))
|
|
{
|
|
// dedup
|
|
normalizedPrefixes := make(map[string]int, len(parsedPrefixes))
|
|
for i, p := range parsedPrefixes {
|
|
normalized, _ := netipx.RangeOfPrefix(p).Prefix()
|
|
normalizedPrefixes[normalized.String()] = i
|
|
}
|
|
|
|
// convert back to list
|
|
for _, i := range normalizedPrefixes {
|
|
prefixes = append(prefixes, parsedPrefixes[i])
|
|
}
|
|
}
|
|
|
|
if len(prefixes) < 1 {
|
|
prefixes = append(prefixes, netip.MustParsePrefix("100.64.0.0/10"))
|
|
log.Warn().
|
|
Msgf("'ip_prefixes' not configured, falling back to default: %v", prefixes)
|
|
}
|
|
|
|
oidcClientSecret := viper.GetString("oidc.client_secret")
|
|
oidcClientSecretPath := viper.GetString("oidc.client_secret_path")
|
|
if oidcClientSecretPath != "" && oidcClientSecret != "" {
|
|
return nil, errOidcMutuallyExclusive
|
|
}
|
|
if oidcClientSecretPath != "" {
|
|
secretBytes, err := os.ReadFile(os.ExpandEnv(oidcClientSecretPath))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
oidcClientSecret = string(secretBytes)
|
|
}
|
|
|
|
return &Config{
|
|
ServerURL: viper.GetString("server_url"),
|
|
Addr: viper.GetString("listen_addr"),
|
|
MetricsAddr: viper.GetString("metrics_listen_addr"),
|
|
GRPCAddr: viper.GetString("grpc_listen_addr"),
|
|
GRPCAllowInsecure: viper.GetBool("grpc_allow_insecure"),
|
|
DisableUpdateCheck: viper.GetBool("disable_check_updates"),
|
|
|
|
IPPrefixes: prefixes,
|
|
PrivateKeyPath: util.AbsolutePathFromConfigPath(
|
|
viper.GetString("private_key_path"),
|
|
),
|
|
NoisePrivateKeyPath: util.AbsolutePathFromConfigPath(
|
|
viper.GetString("noise.private_key_path"),
|
|
),
|
|
BaseDomain: baseDomain,
|
|
|
|
DERP: derpConfig,
|
|
|
|
EphemeralNodeInactivityTimeout: viper.GetDuration(
|
|
"ephemeral_node_inactivity_timeout",
|
|
),
|
|
|
|
NodeUpdateCheckInterval: viper.GetDuration(
|
|
"node_update_check_interval",
|
|
),
|
|
|
|
DBtype: viper.GetString("db_type"),
|
|
DBpath: util.AbsolutePathFromConfigPath(viper.GetString("db_path")),
|
|
DBhost: viper.GetString("db_host"),
|
|
DBport: viper.GetInt("db_port"),
|
|
DBname: viper.GetString("db_name"),
|
|
DBuser: viper.GetString("db_user"),
|
|
DBpass: viper.GetString("db_pass"),
|
|
DBssl: viper.GetString("db_ssl"),
|
|
|
|
TLS: GetTLSConfig(),
|
|
|
|
DNSConfig: dnsConfig,
|
|
|
|
ACMEEmail: viper.GetString("acme_email"),
|
|
ACMEURL: viper.GetString("acme_url"),
|
|
|
|
UnixSocket: viper.GetString("unix_socket"),
|
|
UnixSocketPermission: util.GetFileMode("unix_socket_permission"),
|
|
|
|
OIDC: OIDCConfig{
|
|
OnlyStartIfOIDCIsAvailable: viper.GetBool(
|
|
"oidc.only_start_if_oidc_is_available",
|
|
),
|
|
Issuer: viper.GetString("oidc.issuer"),
|
|
ClientID: viper.GetString("oidc.client_id"),
|
|
ClientSecret: oidcClientSecret,
|
|
Scope: viper.GetStringSlice("oidc.scope"),
|
|
ExtraParams: viper.GetStringMapString("oidc.extra_params"),
|
|
AllowedDomains: viper.GetStringSlice("oidc.allowed_domains"),
|
|
AllowedUsers: viper.GetStringSlice("oidc.allowed_users"),
|
|
AllowedGroups: viper.GetStringSlice("oidc.allowed_groups"),
|
|
UseUsernameClaim: viper.GetBool("oidc.use_username_claim"),
|
|
GroupsClaim: viper.GetString("oidc.groups_claim"),
|
|
EmailClaim: viper.GetString("oidc.email_claim"),
|
|
UsernameClaim: viper.GetString("oidc.username_claim"),
|
|
StripEmaildomain: viper.GetBool("oidc.strip_email_domain"),
|
|
Expiry: func() time.Duration {
|
|
// if set to 0, we assume no expiry
|
|
if value := viper.GetString("oidc.expiry"); value == "0" {
|
|
return maxDuration
|
|
} else {
|
|
expiry, err := model.ParseDuration(value)
|
|
if err != nil {
|
|
log.Warn().Msg("failed to parse oidc.expiry, defaulting back to 180 days")
|
|
|
|
return defaultOIDCExpiryTime
|
|
}
|
|
|
|
return time.Duration(expiry)
|
|
}
|
|
}(),
|
|
UseExpiryFromToken: viper.GetBool("oidc.use_expiry_from_token"),
|
|
},
|
|
|
|
LogTail: logConfig,
|
|
RandomizeClientPort: randomizeClientPort,
|
|
|
|
ACL: GetACLConfig(),
|
|
|
|
CLI: CLIConfig{
|
|
Address: viper.GetString("cli.address"),
|
|
APIKey: viper.GetString("cli.api_key"),
|
|
Timeout: viper.GetDuration("cli.timeout"),
|
|
Insecure: viper.GetBool("cli.insecure"),
|
|
},
|
|
|
|
Log: GetLogConfig(),
|
|
}, nil
|
|
}
|
|
|
|
func IsCLIConfigured() bool {
|
|
return viper.GetString("cli.address") != "" && viper.GetString("cli.api_key") != ""
|
|
}
|