mirror of
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276 lines
8.2 KiB
Go
276 lines
8.2 KiB
Go
// Copyright (c) 2015-2022 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package openid
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import (
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"crypto"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"net/http"
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"sync"
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"time"
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jwtgo "github.com/golang-jwt/jwt/v4"
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"github.com/minio/minio/internal/arn"
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"github.com/minio/minio/internal/auth"
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iampolicy "github.com/minio/pkg/iam/policy"
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xnet "github.com/minio/pkg/net"
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)
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type publicKeys struct {
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*sync.RWMutex
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// map of kid to public key
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pkMap map[string]crypto.PublicKey
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}
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func (pk *publicKeys) parseAndAdd(b io.Reader) error {
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var jwk JWKS
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err := json.NewDecoder(b).Decode(&jwk)
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if err != nil {
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return err
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}
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pk.Lock()
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defer pk.Unlock()
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for _, key := range jwk.Keys {
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pk.pkMap[key.Kid], err = key.DecodePublicKey()
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (pk *publicKeys) get(kid string) crypto.PublicKey {
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pk.RLock()
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defer pk.RUnlock()
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return pk.pkMap[kid]
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}
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// PopulatePublicKey - populates a new publickey from the JWKS URL.
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func (r *Config) PopulatePublicKey(arn arn.ARN) error {
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pCfg := r.arnProviderCfgsMap[arn]
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if pCfg.JWKS.URL == nil || pCfg.JWKS.URL.String() == "" {
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return nil
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}
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client := &http.Client{
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Transport: r.transport,
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}
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resp, err := client.Get(pCfg.JWKS.URL.String())
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if err != nil {
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return err
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}
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defer r.closeRespFn(resp.Body)
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if resp.StatusCode != http.StatusOK {
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return errors.New(resp.Status)
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}
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return r.pubKeys.parseAndAdd(resp.Body)
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}
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// ErrTokenExpired - error token expired
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var (
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ErrTokenExpired = errors.New("token expired")
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)
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func updateClaimsExpiry(dsecs string, claims map[string]interface{}) error {
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expStr := claims["exp"]
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if expStr == "" {
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return ErrTokenExpired
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}
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// No custom duration requested, the claims can be used as is.
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if dsecs == "" {
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return nil
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}
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expAt, err := auth.ExpToInt64(expStr)
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if err != nil {
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return err
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}
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defaultExpiryDuration, err := GetDefaultExpiration(dsecs)
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if err != nil {
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return err
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}
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// Verify if JWT expiry is lesser than default expiry duration,
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// if that is the case then set the default expiration to be
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// from the JWT expiry claim.
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if time.Unix(expAt, 0).UTC().Sub(time.Now().UTC()) < defaultExpiryDuration {
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defaultExpiryDuration = time.Unix(expAt, 0).UTC().Sub(time.Now().UTC())
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} // else honor the specified expiry duration.
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claims["exp"] = time.Now().UTC().Add(defaultExpiryDuration).Unix() // update with new expiry.
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return nil
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}
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const (
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audClaim = "aud"
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azpClaim = "azp"
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)
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// Validate - validates the id_token.
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func (r *Config) Validate(arn arn.ARN, token, accessToken, dsecs string, claims jwtgo.MapClaims) error {
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jp := new(jwtgo.Parser)
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jp.ValidMethods = []string{
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"RS256", "RS384", "RS512", "ES256", "ES384", "ES512",
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"RS3256", "RS3384", "RS3512", "ES3256", "ES3384", "ES3512",
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}
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keyFuncCallback := func(jwtToken *jwtgo.Token) (interface{}, error) {
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kid, ok := jwtToken.Header["kid"].(string)
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if !ok {
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return nil, fmt.Errorf("Invalid kid value %v", jwtToken.Header["kid"])
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}
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return r.pubKeys.get(kid), nil
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}
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pCfg, ok := r.arnProviderCfgsMap[arn]
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if !ok {
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return fmt.Errorf("Role %s does not exist", arn)
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}
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jwtToken, err := jp.ParseWithClaims(token, &claims, keyFuncCallback)
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if err != nil {
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// Re-populate the public key in-case the JWKS
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// pubkeys are refreshed
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if err = r.PopulatePublicKey(arn); err != nil {
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return err
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}
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jwtToken, err = jwtgo.ParseWithClaims(token, &claims, keyFuncCallback)
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if err != nil {
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return err
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}
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}
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if !jwtToken.Valid {
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return ErrTokenExpired
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}
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if err = updateClaimsExpiry(dsecs, claims); err != nil {
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return err
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}
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if err = r.updateUserinfoClaims(arn, accessToken, claims); err != nil {
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return err
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}
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// Validate that matching clientID appears in the aud or azp claims.
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// REQUIRED. Audience(s) that this ID Token is intended for.
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// It MUST contain the OAuth 2.0 client_id of the Relying Party
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// as an audience value. It MAY also contain identifiers for
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// other audiences. In the general case, the aud value is an
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// array of case sensitive strings. In the common special case
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// when there is one audience, the aud value MAY be a single
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// case sensitive
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audValues, ok := iampolicy.GetValuesFromClaims(claims, audClaim)
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if !ok {
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return errors.New("STS JWT Token has `aud` claim invalid, `aud` must match configured OpenID Client ID")
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}
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if !audValues.Contains(pCfg.ClientID) {
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// if audience claims is missing, look for "azp" claims.
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// OPTIONAL. Authorized party - the party to which the ID
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// Token was issued. If present, it MUST contain the OAuth
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// 2.0 Client ID of this party. This Claim is only needed
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// when the ID Token has a single audience value and that
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// audience is different than the authorized party. It MAY
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// be included even when the authorized party is the same
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// as the sole audience. The azp value is a case sensitive
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// string containing a StringOrURI value
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azpValues, ok := iampolicy.GetValuesFromClaims(claims, azpClaim)
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if !ok {
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return errors.New("STS JWT Token has `azp` claim invalid, `azp` must match configured OpenID Client ID")
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}
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if !azpValues.Contains(pCfg.ClientID) {
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return errors.New("STS JWT Token has `azp` claim invalid, `azp` must match configured OpenID Client ID")
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}
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}
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return nil
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}
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func (r *Config) updateUserinfoClaims(arn arn.ARN, accessToken string, claims map[string]interface{}) error {
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pCfg, ok := r.arnProviderCfgsMap[arn]
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// If claim user info is enabled, get claims from userInfo
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// and overwrite them with the claims from JWT.
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if ok && pCfg.ClaimUserinfo {
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if accessToken == "" {
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return errors.New("access_token is mandatory if user_info claim is enabled")
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}
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uclaims, err := pCfg.UserInfo(accessToken, r.transport)
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if err != nil {
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return err
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}
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for k, v := range uclaims {
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if _, ok := claims[k]; !ok { // only add to claims not update it.
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claims[k] = v
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}
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}
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}
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return nil
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}
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// DiscoveryDoc - parses the output from openid-configuration
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// for example https://accounts.google.com/.well-known/openid-configuration
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type DiscoveryDoc struct {
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Issuer string `json:"issuer,omitempty"`
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AuthEndpoint string `json:"authorization_endpoint,omitempty"`
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TokenEndpoint string `json:"token_endpoint,omitempty"`
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UserInfoEndpoint string `json:"userinfo_endpoint,omitempty"`
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RevocationEndpoint string `json:"revocation_endpoint,omitempty"`
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JwksURI string `json:"jwks_uri,omitempty"`
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ResponseTypesSupported []string `json:"response_types_supported,omitempty"`
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SubjectTypesSupported []string `json:"subject_types_supported,omitempty"`
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IDTokenSigningAlgValuesSupported []string `json:"id_token_signing_alg_values_supported,omitempty"`
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ScopesSupported []string `json:"scopes_supported,omitempty"`
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TokenEndpointAuthMethods []string `json:"token_endpoint_auth_methods_supported,omitempty"`
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ClaimsSupported []string `json:"claims_supported,omitempty"`
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CodeChallengeMethodsSupported []string `json:"code_challenge_methods_supported,omitempty"`
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}
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func parseDiscoveryDoc(u *xnet.URL, transport http.RoundTripper, closeRespFn func(io.ReadCloser)) (DiscoveryDoc, error) {
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d := DiscoveryDoc{}
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req, err := http.NewRequest(http.MethodGet, u.String(), nil)
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if err != nil {
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return d, err
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}
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clnt := http.Client{
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Transport: transport,
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}
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resp, err := clnt.Do(req)
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if err != nil {
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return d, err
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}
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defer closeRespFn(resp.Body)
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if resp.StatusCode != http.StatusOK {
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return d, err
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}
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dec := json.NewDecoder(resp.Body)
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if err = dec.Decode(&d); err != nil {
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return d, err
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}
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return d, nil
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}
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