headscale/cmd/headscale/cli/utils.go
2021-08-05 20:57:47 +01:00

197 lines
5.8 KiB
Go

package cli
import (
"encoding/json"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"time"
"github.com/juanfont/headscale"
"github.com/rs/zerolog/log"
"github.com/spf13/viper"
"gopkg.in/yaml.v2"
"inet.af/netaddr"
"tailscale.com/tailcfg"
)
type ErrorOutput struct {
Error string
}
func LoadConfig(path string) error {
viper.SetConfigName("config")
if path == "" {
viper.AddConfigPath("/etc/headscale/")
viper.AddConfigPath("$HOME/.headscale")
viper.AddConfigPath(".")
} else {
// For testing
viper.AddConfigPath(path)
}
viper.AutomaticEnv()
viper.SetDefault("tls_letsencrypt_cache_dir", "/var/www/.cache")
viper.SetDefault("tls_letsencrypt_challenge_type", "HTTP-01")
viper.SetDefault("ip_prefix", "100.64.0.0/10")
viper.SetDefault("log_level", "debug")
err := viper.ReadInConfig()
if err != nil {
return fmt.Errorf("Fatal error reading config file: %s \n", err)
}
// Collect any validation errors and return them all at once
var errorText string
if (viper.GetString("tls_letsencrypt_hostname") != "") && ((viper.GetString("tls_cert_path") != "") || (viper.GetString("tls_key_path") != "")) {
errorText += "Fatal config error: set either tls_letsencrypt_hostname or tls_cert_path/tls_key_path, not both\n"
}
if (viper.GetString("tls_letsencrypt_hostname") != "") && (viper.GetString("tls_letsencrypt_challenge_type") == "TLS-ALPN-01") && (!strings.HasSuffix(viper.GetString("listen_addr"), ":443")) {
// this is only a warning because there could be something sitting in front of headscale that redirects the traffic (e.g. an iptables rule)
log.Warn().
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")
}
if (viper.GetString("tls_letsencrypt_challenge_type") != "HTTP-01") && (viper.GetString("tls_letsencrypt_challenge_type") != "TLS-ALPN-01") {
errorText += "Fatal config error: the only supported values for tls_letsencrypt_challenge_type are HTTP-01 and TLS-ALPN-01\n"
}
if !strings.HasPrefix(viper.GetString("server_url"), "http://") && !strings.HasPrefix(viper.GetString("server_url"), "https://") {
errorText += "Fatal config error: server_url must start with https:// or http://\n"
}
if errorText != "" {
return errors.New(strings.TrimSuffix(errorText, "\n"))
} else {
return nil
}
}
func absPath(path string) string {
// If a relative path is provided, prefix it with the the directory where
// the config file was found.
if (path != "") && !strings.HasPrefix(path, string(os.PathSeparator)) {
dir, _ := filepath.Split(viper.ConfigFileUsed())
if dir != "" {
path = filepath.Join(dir, path)
}
}
return path
}
func getHeadscaleApp() (*headscale.Headscale, error) {
derpPath := absPath(viper.GetString("derp_map_path"))
derpMap, err := loadDerpMap(derpPath)
if err != nil {
log.Error().
Str("path", derpPath).
Err(err).
Msg("Could not load DERP servers map file")
}
// Minimum inactivity time out is keepalive timeout (60s) plus a few seconds
// to avoid races
minInactivityTimeout, _ := time.ParseDuration("65s")
if viper.GetDuration("ephemeral_node_inactivity_timeout") <= minInactivityTimeout {
err = fmt.Errorf("ephemeral_node_inactivity_timeout (%s) is set too low, must be more than %s\n", viper.GetString("ephemeral_node_inactivity_timeout"), minInactivityTimeout)
return nil, err
}
cfg := headscale.Config{
ServerURL: viper.GetString("server_url"),
Addr: viper.GetString("listen_addr"),
PrivateKeyPath: absPath(viper.GetString("private_key_path")),
DerpMap: derpMap,
IPPrefix: netaddr.MustParseIPPrefix(viper.GetString("ip_prefix")),
EphemeralNodeInactivityTimeout: viper.GetDuration("ephemeral_node_inactivity_timeout"),
DBtype: viper.GetString("db_type"),
DBpath: absPath(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"),
TLSLetsEncryptHostname: viper.GetString("tls_letsencrypt_hostname"),
TLSLetsEncryptListen: viper.GetString("tls_letsencrypt_listen"),
TLSLetsEncryptCacheDir: absPath(viper.GetString("tls_letsencrypt_cache_dir")),
TLSLetsEncryptChallengeType: viper.GetString("tls_letsencrypt_challenge_type"),
TLSCertPath: absPath(viper.GetString("tls_cert_path")),
TLSKeyPath: absPath(viper.GetString("tls_key_path")),
}
h, err := headscale.NewHeadscale(cfg)
if err != nil {
return nil, err
}
// We are doing this here, as in the future could be cool to have it also hot-reload
if viper.GetString("acl_policy_path") != "" {
aclPath := absPath(viper.GetString("acl_policy_path"))
err = h.LoadACLPolicy(aclPath)
if err != nil {
log.Error().
Str("path", aclPath).
Err(err).
Msg("Could not load the ACL policy")
}
}
return h, nil
}
func loadDerpMap(path string) (*tailcfg.DERPMap, error) {
derpFile, err := os.Open(path)
if err != nil {
return nil, err
}
defer derpFile.Close()
var derpMap tailcfg.DERPMap
b, err := io.ReadAll(derpFile)
if err != nil {
return nil, err
}
err = yaml.Unmarshal(b, &derpMap)
return &derpMap, err
}
func JsonOutput(result interface{}, errResult error, outputFormat string) {
var j []byte
var err error
switch outputFormat {
case "json":
if errResult != nil {
j, err = json.MarshalIndent(ErrorOutput{errResult.Error()}, "", "\t")
if err != nil {
log.Fatal().Err(err)
}
} else {
j, err = json.MarshalIndent(result, "", "\t")
if err != nil {
log.Fatal().Err(err)
}
}
case "json-line":
if errResult != nil {
j, err = json.Marshal(ErrorOutput{errResult.Error()})
if err != nil {
log.Fatal().Err(err)
}
} else {
j, err = json.Marshal(result)
if err != nil {
log.Fatal().Err(err)
}
}
}
fmt.Println(string(j))
}