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strategy_hmac.go
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strategy_hmac.go
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package oauth2
import (
"context"
"fmt"
"strings"
"time"
"authelia.com/provider/oauth2"
"authelia.com/provider/oauth2/internal/errorsx"
"authelia.com/provider/oauth2/internal/randx"
"authelia.com/provider/oauth2/token/hmac"
)
// NewHMACCoreStrategy creates a new HMACCoreStrategy with the potential to include the prefix format. The prefix must
// include a single '%s' for the purpose of adding the token part (ac, at, and rt; for the Authorize Code, Access
// Token, and Refresh Token; respectively.
func NewHMACCoreStrategy(config HMACCoreStrategyConfigurator, prefix string) (strategy *HMACCoreStrategy) {
if len(prefix) == 0 || strings.Count(prefix, "%s") != 1 {
return &HMACCoreStrategy{
Enigma: &hmac.HMACStrategy{Config: config},
Config: config,
usePrefix: false,
}
}
return &HMACCoreStrategy{
Enigma: &hmac.HMACStrategy{Config: config},
Config: config,
prefix: prefix,
usePrefix: true,
}
}
type HMACCoreStrategy struct {
Enigma *hmac.HMACStrategy
Config interface {
oauth2.AccessTokenLifespanProvider
oauth2.RefreshTokenLifespanProvider
oauth2.AuthorizeCodeLifespanProvider
oauth2.RFC9628DeviceAuthorizeConfigProvider
}
usePrefix bool
prefix string
}
// AccessTokenSignature implements oauth2.AccessTokenStrategy.
func (s *HMACCoreStrategy) AccessTokenSignature(ctx context.Context, tokenString string) (signature string) {
return s.Enigma.Signature(tokenString)
}
// GenerateAccessToken implements oauth2.AccessTokenStrategy.
func (s *HMACCoreStrategy) GenerateAccessToken(ctx context.Context, _ oauth2.Requester) (tokenString string, signature string, err error) {
if tokenString, signature, err = s.Enigma.Generate(ctx); err != nil {
return "", "", err
}
return s.prependPrefix(tokenString, tokenPrefixPartAccessToken), signature, nil
}
// ValidateAccessToken implements oauth2.AccessTokenStrategy.
func (s *HMACCoreStrategy) ValidateAccessToken(ctx context.Context, r oauth2.Requester, tokenString string) (err error) {
var exp = r.GetSession().GetExpiresAt(oauth2.AccessToken)
if exp.IsZero() && r.GetRequestedAt().Add(s.Config.GetAccessTokenLifespan(ctx)).Before(time.Now().UTC()) {
return errorsx.WithStack(oauth2.ErrTokenExpired.WithHintf("Access token expired at '%s'.", r.GetRequestedAt().Add(s.Config.GetAccessTokenLifespan(ctx))))
}
if !exp.IsZero() && exp.Before(time.Now().UTC()) {
return errorsx.WithStack(oauth2.ErrTokenExpired.WithHintf("Access token expired at '%s'.", exp))
}
return s.Enigma.Validate(ctx, s.trimPrefix(tokenString, tokenPrefixPartAccessToken))
}
// RefreshTokenSignature implements oauth2.RefreshTokenStrategy.
func (s *HMACCoreStrategy) RefreshTokenSignature(ctx context.Context, tokenString string) string {
return s.Enigma.Signature(tokenString)
}
// GenerateRefreshToken implements oauth2.RefreshTokenStrategy.
func (s *HMACCoreStrategy) GenerateRefreshToken(ctx context.Context, _ oauth2.Requester) (tokenString string, signature string, err error) {
if tokenString, signature, err = s.Enigma.Generate(ctx); err != nil {
return "", "", err
}
return s.prependPrefix(tokenString, tokenPrefixPartRefreshToken), signature, nil
}
// ValidateRefreshToken implements oauth2.RefreshTokenStrategy.
func (s *HMACCoreStrategy) ValidateRefreshToken(ctx context.Context, r oauth2.Requester, tokenString string) (err error) {
var exp = r.GetSession().GetExpiresAt(oauth2.RefreshToken)
if exp.IsZero() {
return s.Enigma.Validate(ctx, s.trimPrefix(tokenString, tokenPrefixPartRefreshToken))
}
if exp.Before(time.Now().UTC()) {
return errorsx.WithStack(oauth2.ErrTokenExpired.WithHintf("Refresh token expired at '%s'.", exp))
}
return s.Enigma.Validate(ctx, s.trimPrefix(tokenString, tokenPrefixPartRefreshToken))
}
// AuthorizeCodeSignature implements oauth2.AuthorizeCodeStrategy.
func (s *HMACCoreStrategy) AuthorizeCodeSignature(ctx context.Context, token string) string {
return s.Enigma.Signature(token)
}
// GenerateAuthorizeCode implements oauth2.AuthorizeCodeStrategy.
func (s *HMACCoreStrategy) GenerateAuthorizeCode(ctx context.Context, _ oauth2.Requester) (tokenString string, signature string, err error) {
if tokenString, signature, err = s.Enigma.Generate(ctx); err != nil {
return "", "", err
}
return s.prependPrefix(tokenString, tokenPrefixPartAuthorizeCode), signature, nil
}
// ValidateAuthorizeCode implements oauth2.AuthorizeCodeStrategy.
func (s *HMACCoreStrategy) ValidateAuthorizeCode(ctx context.Context, r oauth2.Requester, tokenString string) (err error) {
var exp = r.GetSession().GetExpiresAt(oauth2.AuthorizeCode)
if exp.IsZero() && r.GetRequestedAt().Add(s.Config.GetAuthorizeCodeLifespan(ctx)).Before(time.Now().UTC()) {
return errorsx.WithStack(oauth2.ErrTokenExpired.WithHintf("Authorize code expired at '%s'.", r.GetRequestedAt().Add(s.Config.GetAuthorizeCodeLifespan(ctx))))
}
if !exp.IsZero() && exp.Before(time.Now().UTC()) {
return errorsx.WithStack(oauth2.ErrTokenExpired.WithHintf("Authorize code expired at '%s'.", exp))
}
return s.Enigma.Validate(ctx, s.trimPrefix(tokenString, tokenPrefixPartAuthorizeCode))
}
func (s *HMACCoreStrategy) RFC8628UserCodeSignature(ctx context.Context, tokenString string) (signature string, err error) {
return s.Enigma.GenerateHMACForString(ctx, tokenString)
}
// GenerateRFC8628UserCode implements rfc8628.UserCodeStrategy.
func (s *HMACCoreStrategy) GenerateRFC8628UserCode(ctx context.Context) (tokenString string, signature string, err error) {
seq, err := randx.RuneSequence(8, []rune("BCDFGHJKLMNPQRSTVWXZ"))
if err != nil {
return "", "", err
}
userCode := string(seq)
signUserCode, err := s.RFC8628UserCodeSignature(ctx, userCode)
if err != nil {
return "", "", err
}
return userCode, signUserCode, nil
}
// ValidateRFC8628UserCode implements rfc8628.UserCodeStrategy.
func (s *HMACCoreStrategy) ValidateRFC8628UserCode(ctx context.Context, r oauth2.Requester, code string) (err error) {
var exp = r.GetSession().GetExpiresAt(oauth2.UserCode)
if exp.IsZero() && r.GetRequestedAt().Add(s.Config.GetRFC8628CodeLifespan(ctx)).Before(time.Now().UTC()) {
return errorsx.WithStack(oauth2.ErrDeviceExpiredToken.WithHintf("User code expired at '%s'.", r.GetRequestedAt().Add(s.Config.GetRFC8628CodeLifespan(ctx))))
}
if !exp.IsZero() && exp.Before(time.Now().UTC()) {
return errorsx.WithStack(oauth2.ErrDeviceExpiredToken.WithHintf("User code expired at '%s'.", exp))
}
return nil
}
// RFC8628DeviceCodeSignature implements rfc8628.DeviceCodeStrategy.
func (s *HMACCoreStrategy) RFC8628DeviceCodeSignature(ctx context.Context, tokenString string) (signature string, err error) {
return s.Enigma.Signature(tokenString), nil
}
// GenerateRFC8628DeviceCode implements rfc8628.DeviceCodeStrategy.
func (s *HMACCoreStrategy) GenerateRFC8628DeviceCode(ctx context.Context) (tokenString string, signature string, err error) {
tokenString, sig, err := s.Enigma.Generate(ctx)
if err != nil {
return "", "", err
}
return s.getPrefix(tokenPrefixPartDeviceCode) + tokenString, sig, nil
}
// ValidateRFC8628DeviceCode implements rfc8628.DeviceCodeStrategy.
func (s *HMACCoreStrategy) ValidateRFC8628DeviceCode(ctx context.Context, r oauth2.Requester, code string) (err error) {
var exp = r.GetSession().GetExpiresAt(oauth2.DeviceCode)
if exp.IsZero() && r.GetRequestedAt().Add(s.Config.GetRFC8628CodeLifespan(ctx)).Before(time.Now().UTC()) {
return errorsx.WithStack(oauth2.ErrDeviceExpiredToken.WithHintf("Device code expired at '%s'.", r.GetRequestedAt().Add(s.Config.GetRFC8628CodeLifespan(ctx))))
}
if !exp.IsZero() && exp.Before(time.Now().UTC()) {
return errorsx.WithStack(oauth2.ErrDeviceExpiredToken.WithHintf("Device code expired at '%s'.", exp))
}
return s.Enigma.Validate(ctx, s.trimPrefix(code, tokenPrefixPartDeviceCode))
}
func (s *HMACCoreStrategy) hasPrefix(tokenString, part string) (has bool) {
if !s.usePrefix {
return false
}
return strings.HasPrefix(tokenString, s.getPrefix(part))
}
func (s *HMACCoreStrategy) trimPrefix(tokenString, part string) string {
if !s.usePrefix {
return tokenString
}
return strings.TrimPrefix(tokenString, s.getPrefix(part))
}
func (s *HMACCoreStrategy) prependPrefix(tokenString, part string) string {
if !s.usePrefix {
return tokenString
}
return s.getPrefix(part) + tokenString
}
func (s *HMACCoreStrategy) getPrefix(part string) string {
if !s.usePrefix {
return ""
}
return fmt.Sprintf(s.prefix, part)
}
const (
tokenPrefixPartAuthorizeCode = "ac"
tokenPrefixPartAccessToken = "at"
tokenPrefixPartRefreshToken = "rt"
tokenPrefixPartDeviceCode = "dc"
)
type CoreStrategyConfigurator interface {
HMACCoreStrategyConfigurator
oauth2.AccessTokenIssuerProvider
oauth2.JWTScopeFieldProvider
oauth2.JWTProfileAccessTokensProvider
}
type HMACCoreStrategyConfigurator interface {
oauth2.AccessTokenLifespanProvider
oauth2.RefreshTokenLifespanProvider
oauth2.AuthorizeCodeLifespanProvider
oauth2.TokenEntropyProvider
oauth2.GlobalSecretProvider
oauth2.RotatedGlobalSecretsProvider
oauth2.HMACHashingProvider
oauth2.RFC9628DeviceAuthorizeConfigProvider
}