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settings.go
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settings.go
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// Copyright 2021 The VPN House Authors. All rights reserved.
// Use of this source code is governed by a AGPL-style
// license that can be found in the LICENSE file.
package httpapi
import (
"crypto/tls"
"encoding/json"
"net"
"net/http"
adminAPI "github.com/vpnhouse/api/go/server/tunnel_admin"
"github.com/vpnhouse/tunnel/internal/extstat"
"github.com/vpnhouse/tunnel/internal/runtime"
"github.com/vpnhouse/tunnel/internal/settings"
"github.com/vpnhouse/tunnel/pkg/control"
"github.com/vpnhouse/tunnel/pkg/validator"
"github.com/vpnhouse/tunnel/pkg/version"
"github.com/vpnhouse/tunnel/pkg/xerror"
"github.com/vpnhouse/tunnel/pkg/xhttp"
"github.com/vpnhouse/tunnel/pkg/xnet"
"go.uber.org/zap"
)
// AdminGetSettings implements handler for GET /api/tunnel/admin/settings request
func (tun *TunnelAPI) AdminGetSettings(w http.ResponseWriter, r *http.Request) {
xhttp.JSONResponse(w, func() (interface{}, error) {
s := settingsToOpenAPI(tun.runtime.Settings)
return s, nil
})
}
// AdminInitialSetup POST /api/tunnel/admin/initial-setup
func (tun *TunnelAPI) AdminInitialSetup(w http.ResponseWriter, r *http.Request) {
xhttp.JSONResponse(w, func() (interface{}, error) {
if !version.IsPersonal() {
return nil, xerror.EForbidden("initial setup is disabled for `" + version.GetVersion() + "`")
}
if !tun.runtime.Settings.InitialSetupRequired() {
return nil, xerror.EForbidden("the initial configuration has already been applied")
}
var req adminAPI.InitialSetupRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
return nil, xerror.EInvalidArgument("failed to unmarshal request", err)
}
var dc *xhttp.DomainConfig = nil
if req.Domain != nil {
dc = &xhttp.DomainConfig{
Mode: string(req.Domain.Mode),
Name: req.Domain.DomainName,
IssueSSL: req.Domain.IssueSsl,
Schema: string(req.Domain.Schema),
Dir: tun.runtime.Settings.ConfigDir(),
}
if err := dc.Validate(); err != nil {
return nil, err
}
}
subnet, err := validateSubnet(req.ServerIpMask)
if err != nil {
return nil, err
}
tun.runtime.Settings.Wireguard.Subnet = validator.Subnet(subnet)
// blocks for a certificate issuing, timeout is a LE request timeout is about 10s
if needCert := setDomainConfig(tun.runtime.Settings, dc); needCert {
if err := tun.issueCertificateSync(); err != nil {
return nil, err
}
}
// setting the password resets the "initial setup required" flag.
if err := tun.runtime.Settings.SetAdminPassword(req.AdminPassword); err != nil {
return nil, err
}
if err := tun.runtime.Settings.Flush(); err != nil {
return nil, err
}
if req.SendStats != nil && *req.SendStats {
cfg := extstat.Defaults()
tun.runtime.ReplaceExternalStatsService(
extstat.New(tun.runtime.Settings.InstanceID, cfg),
)
tun.runtime.Settings.ExternalStats = cfg
}
tun.runtime.ExternalStats.OnInstall()
tun.runtime.Events.EmitEvent(control.EventRestart)
return nil, nil
})
}
// AdminUpdateSettings implements handler for PATCH /api/tunnel/admin/settings request
func (tun *TunnelAPI) AdminUpdateSettings(w http.ResponseWriter, r *http.Request) {
xhttp.JSONResponse(w, func() (interface{}, error) {
newSettings, err := openApiSettingsFromRequest(r)
if err != nil {
return nil, err
}
if err := tun.mergeStaticSettings(tun.runtime, newSettings); err != nil {
return nil, err
}
if err := tun.runtime.Settings.Flush(); err != nil {
return nil, err
}
tun.runtime.Events.EmitEvent(control.EventRestart)
updated := settingsToOpenAPI(tun.runtime.Settings)
return updated, nil
})
}
func settingsToOpenAPI(s *settings.Config) adminAPI.Settings {
public := s.Wireguard.GetPrivateKey().Public().Unwrap().String()
subnet := string(s.Wireguard.Subnet)
wgPublicPort := s.Wireguard.ClientPort()
var dc *adminAPI.DomainConfig = nil
if s.Domain != nil {
dc = &adminAPI.DomainConfig{
DomainName: s.Domain.Name,
IssueSsl: s.Domain.IssueSSL,
Mode: adminAPI.DomainConfigMode(s.Domain.Mode),
Schema: adminAPI.DomainConfigSchema(s.Domain.Schema),
}
}
sendStats := s.ExternalStats != nil && s.ExternalStats.Enabled
return adminAPI.Settings{
ConnectionTimeout: &s.GetPublicAPIConfig().PeerTTL,
Dns: &s.Wireguard.DNS,
PingInterval: &s.GetPublicAPIConfig().PingInterval,
WireguardKeepalive: &s.Wireguard.Keepalive,
// note: return both ports, allow to update only the `WireguardServerPort` value.
WireguardListenPort: &s.Wireguard.ListenPort,
WireguardServerPort: &wgPublicPort,
WireguardPublicKey: &public,
WireguardServerIpv4: &s.Wireguard.ServerIPv4,
WireguardSubnet: &subnet,
Domain: dc,
SendStats: &sendStats,
}
}
func (tun *TunnelAPI) mergeStaticSettings(rt *runtime.TunnelRuntime, s adminAPI.Settings) error {
if s.AdminPassword != nil {
if err := rt.Settings.SetAdminPassword(*s.AdminPassword); err != nil {
return err
}
}
if s.WireguardServerIpv4 != nil {
newip := xnet.ParseIP(*s.WireguardServerIpv4)
if newip.IP == nil {
return xerror.WInvalidField("settings", "failed to parse IPv4 address", "wireguard_server_ipv4", nil)
}
if err := rt.Settings.SetPublicIP(newip); err != nil {
return err
}
}
if s.Dns != nil {
rt.Settings.Wireguard.DNS = *s.Dns
}
if s.WireguardKeepalive != nil {
rt.Settings.Wireguard.Keepalive = *s.WireguardKeepalive
}
if s.WireguardSubnet != nil {
subnet, err := validateSubnet(*s.WireguardSubnet)
if err != nil {
return err
}
rt.Settings.Wireguard.Subnet = validator.Subnet(subnet)
}
if s.WireguardServerPort != nil {
rt.Settings.Wireguard.NATedPort = *s.WireguardServerPort
}
if s.Domain != nil {
tmpDC := &xhttp.DomainConfig{
Name: s.Domain.DomainName,
Mode: string(s.Domain.Mode),
IssueSSL: s.Domain.IssueSsl,
Schema: string(s.Domain.Schema),
}
if err := tmpDC.Validate(); err != nil {
return err
}
if needCert := setDomainConfig(tun.runtime.Settings, tmpDC); needCert {
// blocks for a certificate issuing, timeout is a LE request timeout is about 10s
if err := tun.issueCertificateSync(); err != nil {
return err
}
}
} else {
// consider "domain: null" as "disabled for the whole option set"
rt.Settings.Domain = nil
}
if s.SendStats != nil {
if *s.SendStats {
if rt.Settings.ExternalStats == nil {
rt.Settings.ExternalStats = extstat.Defaults()
} else {
rt.Settings.ExternalStats.Enabled = true
}
} else {
if rt.Settings.ExternalStats != nil {
rt.Settings.ExternalStats.Enabled = false
}
}
rt.ReplaceExternalStatsService(
extstat.New(rt.Settings.InstanceID, rt.Settings.ExternalStats),
)
}
return nil
}
func (tun *TunnelAPI) issueCertificateSync() error {
issuer, err := xhttp.NewIssuer(xhttp.IssuerOpts{
Domain: tun.runtime.Settings.Domain.Name,
CacheDir: tun.runtime.Settings.ConfigDir(),
Router: tun.runtime.HttpRouter,
Callback: func(_ *tls.Config) {
zap.L().Info("ssl certificate issued", zap.String("name", tun.runtime.Settings.Domain.Name))
},
})
if err != nil {
return err
}
// ask for the config (it will be cached inside and re-used after the restart).
_, err = issuer.TLSConfig()
return err
}
// setDomainConfig updates current settings with new domain config,
// return true if the new certificate must be issued.
func setDomainConfig(c *settings.Config, dc *xhttp.DomainConfig) bool {
if dc == nil {
return false
}
oldName := ""
if c.Domain != nil {
if c.Domain.Mode == string(adminAPI.DomainConfigModeDirect) {
oldName = c.Domain.Name
}
}
if len(dc.Dir) == 0 {
dc.Dir = c.ConfigDir()
}
c.Domain = dc
if dc.IssueSSL {
if c.SSL == nil || len(c.SSL.ListenAddr) == 0 {
c.SSL = &xhttp.SSLConfig{
ListenAddr: ":443",
}
}
// notify caller that the name differs
return dc.Name != oldName
}
return false
}
func validateSubnet(s string) (string, error) {
_, netw, err := net.ParseCIDR(s)
if err != nil {
return "", err
}
if v4 := netw.IP.To4(); v4 == nil {
return "", xerror.EInvalidArgument("non-IPv4 subnet given", nil)
}
if ones, _ := netw.Mask.Size(); ones < 8 || ones > 30 {
return "", xerror.EInvalidArgument("invalid subnet size given, want /8 to /30", nil)
}
if !xnet.IsPrivateIPNet(netw) {
return "", xerror.EInvalidArgument("non-private subnet given", nil)
}
return netw.String(), nil
}
// openApiSettingsFromRequest parses settings information from request body.
// WARNING! This function does not do any verification of imported data! Caller must do it itself!
func openApiSettingsFromRequest(r *http.Request) (adminAPI.Settings, error) {
var oSettings adminAPI.Settings
dec := json.NewDecoder(r.Body)
if err := dec.Decode(&oSettings); err != nil {
return adminAPI.Settings{}, xerror.EInvalidArgument("invalid settings", err)
}
return oSettings, nil
}