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consent_strategy.go
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/
consent_strategy.go
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package oauth2
import (
"crypto/rsa"
"fmt"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/gorilla/sessions"
"github.com/ory/fosite"
"github.com/ory/fosite/handler/openid"
ejwt "github.com/ory/fosite/token/jwt"
"github.com/ory/hydra/jwk"
"github.com/pborman/uuid"
"github.com/pkg/errors"
)
const (
ConsentChallengeKey = "hydra.consent.challenge"
ConsentEndpointKey = "hydra.consent.response"
)
type DefaultConsentStrategy struct {
Issuer string
DefaultIDTokenLifespan time.Duration
DefaultChallengeLifespan time.Duration
KeyManager jwk.Manager
}
func (s *DefaultConsentStrategy) ValidateResponse(a fosite.AuthorizeRequester, token string, session *sessions.Session) (claims *Session, err error) {
t, err := jwt.Parse(token, func(t *jwt.Token) (interface{}, error) {
if _, ok := t.Method.(*jwt.SigningMethodRSA); !ok {
return nil, errors.Errorf("Unexpected signing method: %v", t.Header["alg"])
}
pk, err := s.KeyManager.GetKey(ConsentEndpointKey, "public")
if err != nil {
return nil, err
}
rsaKey, ok := jwk.First(pk.Keys).Key.(*rsa.PublicKey)
if !ok {
return nil, errors.New("Could not convert to RSA Private Key")
}
return rsaKey, nil
})
if err != nil {
return nil, errors.Wrap(err, "The consent response is not a valid JSON Web Token")
}
// make sure to use MapClaims since that is the default..
jwtClaims, ok := t.Claims.(jwt.MapClaims)
if err != nil || !ok {
return nil, errors.Errorf("Couldn't parse token: %v", err)
} else if !t.Valid {
return nil, errors.Errorf("Token is invalid")
}
if j, ok := session.Values["consent_jti"]; !ok {
return nil, errors.Errorf("Session cookie is missing anti-replay token")
} else if js, ok := j.(string); !ok {
return nil, errors.Errorf("Session cookie anti-replay value is not a string")
} else if js != ejwt.ToString(jwtClaims["jti"]) {
return nil, errors.Errorf("Session cookie anti-replay value does not match value from consent response")
}
delete(session.Values, "jti")
if time.Now().After(ejwt.ToTime(jwtClaims["exp"])) {
return nil, errors.Errorf("Token expired")
}
if ejwt.ToString(jwtClaims["aud"]) != a.GetClient().GetID() {
return nil, errors.Errorf("Audience mismatch")
}
subject := ejwt.ToString(jwtClaims["sub"])
scopes := toStringSlice(jwtClaims["scp"])
for _, scope := range scopes {
a.GrantScope(scope)
}
var idExt map[string]interface{}
var atExt map[string]interface{}
if ext, ok := jwtClaims["id_ext"].(map[string]interface{}); ok {
idExt = ext
}
if ext, ok := jwtClaims["at_ext"].(map[string]interface{}); ok {
atExt = ext
}
return &Session{
DefaultSession: &openid.DefaultSession{
Claims: &ejwt.IDTokenClaims{
Audience: a.GetClient().GetID(),
Subject: subject,
Issuer: s.Issuer,
IssuedAt: time.Now(),
ExpiresAt: time.Now().Add(s.DefaultIDTokenLifespan),
Extra: idExt,
},
Headers: &ejwt.Headers{},
Subject: subject,
},
Extra: atExt,
}, err
}
func toStringSlice(i interface{}) []string {
if r, ok := i.([]string); ok {
return r
} else if r, ok := i.(fosite.Arguments); ok {
return r
} else if r, ok := i.([]interface{}); ok {
ret := make([]string, 0)
for _, y := range r {
s, ok := y.(string)
if ok {
ret = append(ret, s)
}
}
return ret
}
return []string{}
}
func (s *DefaultConsentStrategy) IssueChallenge(authorizeRequest fosite.AuthorizeRequester, redirectURL string, session *sessions.Session) (string, error) {
token := jwt.New(jwt.SigningMethodRS256)
jti := uuid.New()
token.Claims = jwt.MapClaims{
"jti": jti,
"scp": authorizeRequest.GetRequestedScopes(),
"aud": authorizeRequest.GetClient().GetID(),
"exp": time.Now().Add(s.DefaultChallengeLifespan).Unix(),
"redir": redirectURL,
}
session.Values["consent_jti"] = jti
ks, err := s.KeyManager.GetKey(ConsentChallengeKey, "private")
if err != nil {
return "", errors.WithStack(err)
}
rsaKey, ok := jwk.First(ks.Keys).Key.(*rsa.PrivateKey)
if !ok {
return "", errors.New("Could not convert to RSA Private Key")
}
var signature, encoded string
if encoded, err = token.SigningString(); err != nil {
return "", errors.WithStack(err)
} else if signature, err = token.Method.Sign(encoded, rsaKey); err != nil {
return "", errors.WithStack(err)
}
return fmt.Sprintf("%s.%s", encoded, signature), nil
}