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server_config.go
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server_config.go
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package internal
import (
"net"
"os"
"time"
"github.com/greenstatic/openspa/pkg/openspalib"
"github.com/greenstatic/openspa/pkg/openspalib/crypto"
"github.com/pkg/errors"
"gopkg.in/yaml.v2"
)
type Verifier interface {
Verify() error
}
type ServerConfig struct {
Server ServerConfigServer `yaml:"server"`
Firewall ServerConfigFirewall `yaml:"firewall"`
Authorization ServerConfigAuthorization `yaml:"authorization"`
Crypto ServerConfigCrypto `yaml:"crypto"`
}
type ServerConfigServer struct {
IP string `yaml:"ip"`
Port int `yaml:"port"`
RequestHandlers int `yaml:"requestHandlers"`
HTTP ServerConfigServerHTTP `yaml:"http"`
ADK ServerConfigADK `yaml:"adk"`
}
type ServerConfigServerHTTP struct {
Enable bool `yaml:"enable"`
IP string `yaml:"ip"`
Port int `yaml:"port"`
}
type ServerConfigADK struct {
Secret string `yaml:"secret"`
XDP ServerConfigADKXDP `yaml:"xdp"`
}
const (
ServerConfigADKXDPModeSKB = "skb"
ServerConfigADKXDPModeDriver = "driver"
// ServerConfigADKXDPModeHW = "hw"
)
type ServerConfigADKXDP struct {
Mode string `yaml:"mode"`
Interfaces []string `yaml:"interfaces"`
}
const (
ServerConfigFirewallBackendIPTables = "iptables"
ServerConfigFirewallBackendCommand = "command"
ServerConfigFirewallBackendNone = "none" // used for performance measurements, not for production workload
)
type ServerConfigFirewall struct {
Backend string `yaml:"backend"`
IPTables *ServerConfigFirewallIPTables `yaml:"iptables"`
Command *ServerConfigFirewallCommand `yaml:"command"`
}
type ServerConfigFirewallIPTables struct {
Chain string `yaml:"chain"`
}
type ServerConfigFirewallCommand struct {
RuleAdd string `yaml:"ruleAdd"`
RuleRemove string `yaml:"ruleRemove"`
FirewallSetup string `yaml:"firewallSetup,omitempty"` // optional
}
const (
ServerConfigAuthorizationBackendSimple = "simple"
ServerConfigAuthorizationBackendCommand = "command"
ServerConfigAuthorizationBackendNone = "none" // used for performance measurements, not for production workload
)
type ServerConfigAuthorization struct {
Backend string `yaml:"backend"`
Simple *ServerConfigAuthorizationSimple `yaml:"simple"`
Command *ServerConfigAuthorizationCommand `yaml:"command"`
}
type ServerConfigAuthorizationSimple struct {
Duration string `yaml:"duration"`
}
type ServerConfigAuthorizationCommand struct {
AuthorizationCmd string `yaml:"authorizationCmd"`
}
type ServerConfigCrypto struct {
CipherSuitePriority []string `yaml:"cipherSuitePriority"`
RSA ServerConfigCryptoRSA `yaml:"rsa"`
}
type ServerConfigCryptoRSA struct {
Client ServerConfigCryptoRSAClient `yaml:"client"`
Server ServerConfigCryptoRSAServer `yaml:"server"`
}
type ServerConfigCryptoRSAClient struct {
PublicKeyLookupDir string `yaml:"publicKeyLookupDir"`
}
type ServerConfigCryptoRSAServer struct {
PrivateKeyPath string `yaml:"privateKeyPath"`
PublicKeyPath string `yaml:"publicKeyPath"`
}
func (s ServerConfig) Verify() error {
if err := s.Server.Verify(); err != nil {
return errors.Wrap(err, "server")
}
if err := s.Firewall.Verify(); err != nil {
return errors.Wrap(err, "firewall")
}
if err := s.Authorization.Verify(); err != nil {
return errors.Wrap(err, "authorization")
}
if err := s.Crypto.Verify(); err != nil {
return errors.Wrap(err, "crypto")
}
return nil
}
func (s ServerConfigServer) Verify() error {
if ip := net.ParseIP(s.IP); ip == nil {
return errors.New("invalid ip")
}
if s.Port == 0 {
return errors.New("invalid port")
}
if s.RequestHandlers < 0 {
return errors.New("invalid request handlers")
}
if err := s.HTTP.Verify(); err != nil {
return errors.Wrap(err, "http")
}
if err := s.ADK.Verify(); err != nil {
return errors.Wrap(err, "adk")
}
return nil
}
func (s ServerConfigServerHTTP) Verify() error {
if s.Enable {
if ip := net.ParseIP(s.IP); ip == nil {
return errors.New("invalid http ip")
}
if s.Port == 0 {
return errors.New("invalid port")
}
}
return nil
}
func (s ServerConfigADK) Verify() error {
if len(s.Secret) > 0 {
if len(s.Secret) != openspalib.ADKSecretEncodedLen {
return errors.New("encoded secret should be length 7")
}
}
if err := s.XDP.Verify(); err != nil {
return errors.Wrap(err, "xdp")
}
return nil
}
func (s ServerConfigADKXDP) Verify() error {
modeErr := serverConfigADKXDPValidMode(s.Mode)
if s.Mode == "" && len(s.Interfaces) > 0 {
return nil
}
if s.Mode == "" && len(s.Interfaces) != 0 {
return errors.New("missing mode")
}
if modeErr == nil && len(s.Interfaces) == 0 {
return errors.New("missing interfaces")
}
return nil
}
func (s ServerConfigFirewall) Verify() error {
switch s.Backend {
case ServerConfigFirewallBackendIPTables:
if s.IPTables == nil {
return errors.New("iptables field is missing")
}
if s.Command != nil {
return errors.New("command is defined while using iptables backend")
}
if err := s.IPTables.Verify(); err != nil {
return errors.Wrap(err, "iptables")
}
case ServerConfigFirewallBackendCommand:
if s.Command == nil {
return errors.New("command field is missing")
}
if s.IPTables != nil {
return errors.New("iptables is defined while using command backend")
}
if err := s.Command.Verify(); err != nil {
return errors.Wrap(err, "command")
}
case ServerConfigFirewallBackendNone:
return nil
default:
return errors.New("invalid backend")
}
return nil
}
func (s ServerConfigFirewallIPTables) Verify() error {
if len(s.Chain) == 0 {
return errors.New("chain parameter is empty")
}
return nil
}
func (s ServerConfigFirewallCommand) Verify() error {
//nolint:staticcheck
if len(s.FirewallSetup) == 0 {
// It's okay if the firewall setup command is empty, it is optional
}
if len(s.RuleAdd) == 0 {
return errors.New("rule add is empty")
}
if len(s.RuleRemove) == 0 {
return errors.New("rule remove is empty")
}
return nil
}
func (s ServerConfigAuthorization) Verify() error {
switch s.Backend {
case ServerConfigAuthorizationBackendSimple:
if s.Simple == nil {
return errors.New("simple field is missing")
}
if s.Command != nil {
return errors.New("command is defined while using simple backend")
}
if err := s.Simple.Verify(); err != nil {
return errors.Wrap(err, "simple")
}
case ServerConfigAuthorizationBackendCommand:
if s.Command == nil {
return errors.New("command field is missing")
}
if s.Simple != nil {
return errors.New("simple is defined while using command backend")
}
if err := s.Command.Verify(); err != nil {
return errors.Wrap(err, "command")
}
case ServerConfigAuthorizationBackendNone:
return nil
default:
return errors.New("invalid backend")
}
return nil
}
func (s ServerConfigAuthorizationSimple) Verify() error {
d, err := time.ParseDuration(s.Duration)
if err != nil {
return errors.Wrap(err, "duration parse")
}
if d.Seconds() < 1 {
return errors.New("duration is shorter than a second")
}
if d.Seconds() > float64(openspalib.DurationMax) {
return errors.New("duration is longer than max allowed duration")
}
return nil
}
func (s ServerConfigAuthorizationSimple) GetDuration() time.Duration {
d, err := time.ParseDuration(s.Duration)
if err != nil {
panic(err)
}
return d
}
func (s ServerConfigAuthorizationCommand) Verify() error {
if s.AuthorizationCmd == "" {
return errors.New("authorization cmd empty")
}
return nil
}
func (s ServerConfigCrypto) Verify() error {
if len(s.CipherSuitePriority) == 0 {
return errors.New("cipherSuitePriority empty")
}
for _, cs := range s.CipherSuitePriority {
if crypto.CipherSuiteStringToID(cs) == crypto.CipherUnknown {
return errors.New("cipherSuitePriority unsupported/unknown cipher: " + cs)
}
}
if err := s.RSA.Verify(); err != nil {
return errors.Wrap(err, "rsa")
}
return nil
}
func (s ServerConfigCryptoRSA) Verify() error {
if err := s.Client.Verify(); err != nil {
return errors.Wrap(err, "client")
}
if err := s.Server.Verify(); err != nil {
return errors.Wrap(err, "server")
}
return nil
}
func (s ServerConfigCryptoRSAClient) Verify() error {
if _, err := os.Stat(s.PublicKeyLookupDir); errors.Is(err, os.ErrNotExist) {
return errors.New("public key lookup dir does not exist")
}
return nil
}
func (s ServerConfigCryptoRSAServer) Verify() error {
if _, err := os.Stat(s.PrivateKeyPath); errors.Is(err, os.ErrNotExist) {
return errors.New("private key path file does not exist")
}
if _, err := os.Stat(s.PublicKeyPath); errors.Is(err, os.ErrNotExist) {
return errors.New("public key path file does not exist")
}
return nil
}
// Merge sc -> s.
func (s ServerConfig) Merge(sc ServerConfig) ServerConfig {
f := s
if sc.Server.IP != "" {
f.Server.IP = sc.Server.IP
}
if sc.Server.Port != 0 {
f.Server.Port = sc.Server.Port
}
f.Server.RequestHandlers = sc.Server.RequestHandlers
f.Server.HTTP.Enable = sc.Server.HTTP.Enable
if len(sc.Server.HTTP.IP) > 0 {
f.Server.HTTP.IP = sc.Server.HTTP.IP
}
if sc.Server.HTTP.Port != 0 {
f.Server.HTTP.IP = sc.Server.HTTP.IP
}
if len(sc.Server.ADK.Secret) != 0 {
f.Server.ADK = sc.Server.ADK
}
f.Firewall = sc.Firewall
f.Authorization = sc.Authorization
f.Crypto = sc.Crypto
return f
}
func ServerConfigParse(b []byte) (ServerConfig, error) {
sc := ServerConfig{}
if err := yaml.Unmarshal(b, &sc); err != nil {
return ServerConfig{}, errors.Wrap(err, "yaml unmarshal")
}
d := DefaultServerConfig()
return d.Merge(sc), nil
}
func DefaultServerConfig() ServerConfig {
return ServerConfig{
Server: ServerConfigServer{
IP: "::",
Port: openspalib.DefaultServerPort,
RequestHandlers: NoRequestHandlersDefault,
HTTP: ServerConfigServerHTTP{
Enable: true,
IP: "::",
Port: ServerHTTPPortDefault,
},
ADK: ServerConfigADK{
Secret: "",
XDP: ServerConfigADKXDP{
Mode: "",
Interfaces: nil,
},
},
},
}
}
func serverConfigADKXDPValidMode(m string) error {
switch m {
// case ServerConfigADKXDPModeSKB, ServerConfigADKXDPModeDriver, ServerConfigADKXDPModeHW:
case ServerConfigADKXDPModeSKB, ServerConfigADKXDPModeDriver:
return nil
default:
return errors.New("unsupported mode")
}
}