mirror of
https://github.com/juanfont/headscale.git
synced 2024-12-20 19:09:07 +01:00
897d480f4d
This series of commit will be adding an embedded DERP server (and STUN) to Headscale, thus making it completely self-contained and not dependant in other infrastructure.
553 lines
15 KiB
Go
553 lines
15 KiB
Go
package cli
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import (
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"context"
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"crypto/tls"
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"encoding/json"
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"errors"
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"fmt"
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"io/fs"
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"net/url"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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"github.com/juanfont/headscale"
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v1 "github.com/juanfont/headscale/gen/go/headscale/v1"
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"github.com/rs/zerolog/log"
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"github.com/spf13/viper"
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"google.golang.org/grpc"
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"google.golang.org/grpc/credentials"
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"google.golang.org/grpc/credentials/insecure"
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"gopkg.in/yaml.v2"
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"inet.af/netaddr"
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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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PermissionFallback = 0o700
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HeadscaleDateTimeFormat = "2006-01-02 15:04:05"
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)
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func LoadConfig(path string) error {
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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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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", "HTTP-01")
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viper.SetDefault("tls_client_auth_mode", "relaxed")
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viper.SetDefault("log_level", "info")
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viper.SetDefault("dns_config", nil)
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viper.SetDefault("unix_socket", "/var/run/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("oidc.strip_email_domain", true)
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if err := viper.ReadInConfig(); err != nil {
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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.GetString("tls_letsencrypt_hostname") != "") &&
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(viper.GetString("tls_letsencrypt_challenge_type") == "TLS-ALPN-01") &&
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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") != "HTTP-01") &&
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(viper.GetString("tls_letsencrypt_challenge_type") != "TLS-ALPN-01") {
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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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_, authModeValid := headscale.LookupTLSClientAuthMode(
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viper.GetString("tls_client_auth_mode"),
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)
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if !authModeValid {
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errorText += fmt.Sprintf(
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"Invalid tls_client_auth_mode supplied: %s. Accepted values: %s, %s, %s.",
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viper.GetString("tls_client_auth_mode"),
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headscale.DisabledClientAuth,
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headscale.RelaxedClientAuth,
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headscale.EnforcedClientAuth)
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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 GetDERPConfig() headscale.DERPConfig {
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if viper.GetBool("derp.embedded_derp") {
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return headscale.DERPConfig{
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EmbeddedDERP: true,
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}
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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 headscale.DERPConfig{
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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 GetDNSConfig() (*tailcfg.DNSConfig, string) {
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if viper.IsSet("dns_config") {
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dnsConfig := &tailcfg.DNSConfig{}
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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 := make([]netaddr.IP, len(nameserversStr))
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resolvers := make([]dnstype.Resolver, len(nameserversStr))
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for index, nameserverStr := range nameserversStr {
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nameserver, err := netaddr.ParseIP(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[index] = nameserver
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resolvers[index] = 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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dnsConfig.Resolvers = resolvers
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}
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if viper.IsSet("dns_config.restricted_nameservers") {
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if len(dnsConfig.Nameservers) > 0 {
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dnsConfig.Routes = make(map[string][]dnstype.Resolver)
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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 := netaddr.ParseIP(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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}
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} else {
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log.Warn().
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Msg("Warning: dns_config.restricted_nameservers is set, but no nameservers are configured. Ignoring restricted_nameservers.")
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}
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}
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if viper.IsSet("dns_config.domains") {
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dnsConfig.Domains = viper.GetStringSlice("dns_config.domains")
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}
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if viper.IsSet("dns_config.magic_dns") {
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magicDNS := viper.GetBool("dns_config.magic_dns")
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if len(dnsConfig.Nameservers) > 0 {
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dnsConfig.Proxied = magicDNS
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} else if magicDNS {
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log.Warn().
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Msg("Warning: dns_config.magic_dns is set, but no nameservers are configured. Ignoring magic_dns.")
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}
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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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return dnsConfig, baseDomain
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}
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return nil, ""
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}
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func absPath(path string) string {
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// If a relative path is provided, prefix it with the the directory where
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// the config file was found.
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if (path != "") && !strings.HasPrefix(path, string(os.PathSeparator)) {
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dir, _ := filepath.Split(viper.ConfigFileUsed())
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if dir != "" {
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path = filepath.Join(dir, path)
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}
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}
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return path
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}
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func getHeadscaleConfig() headscale.Config {
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dnsConfig, baseDomain := GetDNSConfig()
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derpConfig := GetDERPConfig()
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configuredPrefixes := viper.GetStringSlice("ip_prefixes")
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parsedPrefixes := make([]netaddr.IPPrefix, 0, len(configuredPrefixes)+1)
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legacyPrefixField := viper.GetString("ip_prefix")
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if len(legacyPrefixField) > 0 {
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log.
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Warn().
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Msgf(
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"%s, %s",
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"use of 'ip_prefix' for configuration is deprecated",
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"please see 'ip_prefixes' in the shipped example.",
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)
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legacyPrefix, err := netaddr.ParseIPPrefix(legacyPrefixField)
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if err != nil {
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panic(fmt.Errorf("failed to parse ip_prefix: %w", err))
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}
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parsedPrefixes = append(parsedPrefixes, legacyPrefix)
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}
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for i, prefixInConfig := range configuredPrefixes {
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prefix, err := netaddr.ParseIPPrefix(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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parsedPrefixes = append(parsedPrefixes, prefix)
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}
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prefixes := make([]netaddr.IPPrefix, 0, len(parsedPrefixes))
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{
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// dedup
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normalizedPrefixes := make(map[string]int, len(parsedPrefixes))
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for i, p := range parsedPrefixes {
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normalized, _ := p.Range().Prefix()
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normalizedPrefixes[normalized.String()] = i
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}
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// convert back to list
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for _, i := range normalizedPrefixes {
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prefixes = append(prefixes, parsedPrefixes[i])
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}
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}
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if len(prefixes) < 1 {
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prefixes = append(prefixes, netaddr.MustParseIPPrefix("100.64.0.0/10"))
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log.Warn().
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Msgf("'ip_prefixes' not configured, falling back to default: %v", prefixes)
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}
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tlsClientAuthMode, _ := headscale.LookupTLSClientAuthMode(
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viper.GetString("tls_client_auth_mode"),
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)
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return headscale.Config{
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ServerURL: viper.GetString("server_url"),
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Addr: viper.GetString("listen_addr"),
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GRPCAddr: viper.GetString("grpc_listen_addr"),
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GRPCAllowInsecure: viper.GetBool("grpc_allow_insecure"),
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IPPrefixes: prefixes,
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PrivateKeyPath: absPath(viper.GetString("private_key_path")),
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BaseDomain: baseDomain,
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DERP: derpConfig,
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EphemeralNodeInactivityTimeout: viper.GetDuration(
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"ephemeral_node_inactivity_timeout",
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),
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DBtype: viper.GetString("db_type"),
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DBpath: absPath(viper.GetString("db_path")),
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DBhost: viper.GetString("db_host"),
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DBport: viper.GetInt("db_port"),
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DBname: viper.GetString("db_name"),
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DBuser: viper.GetString("db_user"),
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DBpass: viper.GetString("db_pass"),
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TLSLetsEncryptHostname: viper.GetString("tls_letsencrypt_hostname"),
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TLSLetsEncryptListen: viper.GetString("tls_letsencrypt_listen"),
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TLSLetsEncryptCacheDir: absPath(
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viper.GetString("tls_letsencrypt_cache_dir"),
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),
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TLSLetsEncryptChallengeType: viper.GetString("tls_letsencrypt_challenge_type"),
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TLSCertPath: absPath(viper.GetString("tls_cert_path")),
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TLSKeyPath: absPath(viper.GetString("tls_key_path")),
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TLSClientAuthMode: tlsClientAuthMode,
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DNSConfig: dnsConfig,
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ACMEEmail: viper.GetString("acme_email"),
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ACMEURL: viper.GetString("acme_url"),
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UnixSocket: viper.GetString("unix_socket"),
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UnixSocketPermission: GetFileMode("unix_socket_permission"),
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OIDC: headscale.OIDCConfig{
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Issuer: viper.GetString("oidc.issuer"),
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ClientID: viper.GetString("oidc.client_id"),
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ClientSecret: viper.GetString("oidc.client_secret"),
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StripEmaildomain: viper.GetBool("oidc.strip_email_domain"),
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},
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CLI: headscale.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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}
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}
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func getHeadscaleApp() (*headscale.Headscale, error) {
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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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// TODO: Find a better way to return this text
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//nolint
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err := fmt.Errorf(
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"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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return nil, err
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}
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cfg := getHeadscaleConfig()
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app, err := headscale.NewHeadscale(cfg)
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if err != nil {
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return nil, err
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}
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// We are doing this here, as in the future could be cool to have it also hot-reload
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if viper.GetString("acl_policy_path") != "" {
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aclPath := absPath(viper.GetString("acl_policy_path"))
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err = app.LoadACLPolicy(aclPath)
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if err != nil {
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log.Error().
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Str("path", aclPath).
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Err(err).
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Msg("Could not load the ACL policy")
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}
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}
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return app, nil
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}
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func getHeadscaleCLIClient() (context.Context, v1.HeadscaleServiceClient, *grpc.ClientConn, context.CancelFunc) {
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cfg := getHeadscaleConfig()
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log.Debug().
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Dur("timeout", cfg.CLI.Timeout).
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Msgf("Setting timeout")
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ctx, cancel := context.WithTimeout(context.Background(), cfg.CLI.Timeout)
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grpcOptions := []grpc.DialOption{
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grpc.WithBlock(),
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}
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address := cfg.CLI.Address
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// If the address is not set, we assume that we are on the server hosting headscale.
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if address == "" {
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log.Debug().
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Str("socket", cfg.UnixSocket).
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Msgf("HEADSCALE_CLI_ADDRESS environment is not set, connecting to unix socket.")
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address = cfg.UnixSocket
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grpcOptions = append(
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grpcOptions,
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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grpc.WithContextDialer(headscale.GrpcSocketDialer),
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)
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} else {
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// If we are not connecting to a local server, require an API key for authentication
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apiKey := cfg.CLI.APIKey
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if apiKey == "" {
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log.Fatal().Caller().Msgf("HEADSCALE_CLI_API_KEY environment variable needs to be set.")
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}
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grpcOptions = append(grpcOptions,
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grpc.WithPerRPCCredentials(tokenAuth{
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token: apiKey,
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}),
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)
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if cfg.CLI.Insecure {
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tlsConfig := &tls.Config{
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// turn of gosec as we are intentionally setting
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// insecure.
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//nolint:gosec
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InsecureSkipVerify: true,
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}
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grpcOptions = append(grpcOptions,
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grpc.WithTransportCredentials(credentials.NewTLS(tlsConfig)),
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)
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} else {
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grpcOptions = append(grpcOptions,
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grpc.WithTransportCredentials(credentials.NewClientTLSFromCert(nil, "")),
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)
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}
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}
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log.Trace().Caller().Str("address", address).Msg("Connecting via gRPC")
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conn, err := grpc.DialContext(ctx, address, grpcOptions...)
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if err != nil {
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log.Fatal().Caller().Err(err).Msgf("Could not connect: %v", err)
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}
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client := v1.NewHeadscaleServiceClient(conn)
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return ctx, client, conn, cancel
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}
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func SuccessOutput(result interface{}, override string, outputFormat string) {
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var jsonBytes []byte
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var err error
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switch outputFormat {
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case "json":
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jsonBytes, err = json.MarshalIndent(result, "", "\t")
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if err != nil {
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log.Fatal().Err(err)
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}
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case "json-line":
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jsonBytes, err = json.Marshal(result)
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if err != nil {
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log.Fatal().Err(err)
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}
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case "yaml":
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jsonBytes, err = yaml.Marshal(result)
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if err != nil {
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log.Fatal().Err(err)
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}
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default:
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//nolint
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fmt.Println(override)
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return
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}
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//nolint
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fmt.Println(string(jsonBytes))
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}
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|
func ErrorOutput(errResult error, override string, outputFormat string) {
|
|
type errOutput struct {
|
|
Error string `json:"error"`
|
|
}
|
|
|
|
SuccessOutput(errOutput{errResult.Error()}, override, outputFormat)
|
|
}
|
|
|
|
func HasMachineOutputFlag() bool {
|
|
for _, arg := range os.Args {
|
|
if arg == "json" || arg == "json-line" || arg == "yaml" {
|
|
return true
|
|
}
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
type tokenAuth struct {
|
|
token string
|
|
}
|
|
|
|
// Return value is mapped to request headers.
|
|
func (t tokenAuth) GetRequestMetadata(
|
|
ctx context.Context,
|
|
in ...string,
|
|
) (map[string]string, error) {
|
|
return map[string]string{
|
|
"authorization": "Bearer " + t.token,
|
|
}, nil
|
|
}
|
|
|
|
func (tokenAuth) RequireTransportSecurity() bool {
|
|
return true
|
|
}
|
|
|
|
func GetFileMode(key string) fs.FileMode {
|
|
modeStr := viper.GetString(key)
|
|
|
|
mode, err := strconv.ParseUint(modeStr, headscale.Base8, headscale.BitSize64)
|
|
if err != nil {
|
|
return PermissionFallback
|
|
}
|
|
|
|
return fs.FileMode(mode)
|
|
}
|