frp/pkg/auth/oidc.go

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// Copyright 2020 guylewin, guy@lewin.co.il
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package auth
import (
"context"
"fmt"
"github.com/coreos/go-oidc"
"golang.org/x/oauth2/clientcredentials"
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"github.com/fatedier/frp/pkg/msg"
)
type OidcClientConfig struct {
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// OidcClientID specifies the client ID to use to get a token in OIDC
// authentication if AuthenticationMethod == "oidc". By default, this value
// is "".
OidcClientID string `ini:"oidc_client_id" json:"oidc_client_id"`
// OidcClientSecret specifies the client secret to use to get a token in OIDC
// authentication if AuthenticationMethod == "oidc". By default, this value
// is "".
OidcClientSecret string `ini:"oidc_client_secret" json:"oidc_client_secret"`
// OidcAudience specifies the audience of the token in OIDC authentication
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// if AuthenticationMethod == "oidc". By default, this value is "".
OidcAudience string `ini:"oidc_audience" json:"oidc_audience"`
// OidcScope specifies the scope of the token in OIDC authentication
// if AuthenticationMethod == "oidc". By default, this value is "".
OidcScope string `ini:"oidc_scope" json:"oidc_scope"`
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// OidcTokenEndpointURL specifies the URL which implements OIDC Token Endpoint.
// It will be used to get an OIDC token if AuthenticationMethod == "oidc".
// By default, this value is "".
OidcTokenEndpointURL string `ini:"oidc_token_endpoint_url" json:"oidc_token_endpoint_url"`
// OidcAdditionalEndpointParams specifies additional parameters to be sent
// this field will be transfer to map[string][]string in OIDC token generator
// The field will be set by prefix "oidc_additional_"
OidcAdditionalEndpointParams map[string]string `ini:"-" json:"oidc_additional_endpoint_params"`
}
func getDefaultOidcClientConf() OidcClientConfig {
return OidcClientConfig{
OidcClientID: "",
OidcClientSecret: "",
OidcAudience: "",
OidcScope: "",
OidcTokenEndpointURL: "",
OidcAdditionalEndpointParams: make(map[string]string),
}
}
type OidcServerConfig struct {
// OidcIssuer specifies the issuer to verify OIDC tokens with. This issuer
// will be used to load public keys to verify signature and will be compared
// with the issuer claim in the OIDC token. It will be used if
// AuthenticationMethod == "oidc". By default, this value is "".
OidcIssuer string `ini:"oidc_issuer" json:"oidc_issuer"`
// OidcAudience specifies the audience OIDC tokens should contain when validated.
// If this value is empty, audience ("client ID") verification will be skipped.
// It will be used when AuthenticationMethod == "oidc". By default, this
// value is "".
OidcAudience string `ini:"oidc_audience" json:"oidc_audience"`
// OidcSkipExpiryCheck specifies whether to skip checking if the OIDC token is
// expired. It will be used when AuthenticationMethod == "oidc". By default, this
// value is false.
OidcSkipExpiryCheck bool `ini:"oidc_skip_expiry_check" json:"oidc_skip_expiry_check"`
// OidcSkipIssuerCheck specifies whether to skip checking if the OIDC token's
// issuer claim matches the issuer specified in OidcIssuer. It will be used when
// AuthenticationMethod == "oidc". By default, this value is false.
OidcSkipIssuerCheck bool `ini:"oidc_skip_issuer_check" json:"oidc_skip_issuer_check"`
}
func getDefaultOidcServerConf() OidcServerConfig {
return OidcServerConfig{
OidcIssuer: "",
OidcAudience: "",
OidcSkipExpiryCheck: false,
OidcSkipIssuerCheck: false,
}
}
type OidcAuthProvider struct {
BaseConfig
tokenGenerator *clientcredentials.Config
}
func NewOidcAuthSetter(baseCfg BaseConfig, cfg OidcClientConfig) *OidcAuthProvider {
eps := make(map[string][]string)
for k, v := range cfg.OidcAdditionalEndpointParams {
eps[k] = []string{v}
}
// Previous versions hardcoded the scope to audience,
// so for backwards compatibility, use that if no scope is set
scope := cfg.OidcAudience
if cfg.OidcScope != "" {
scope = cfg.OidcScope
}
tokenGenerator := &clientcredentials.Config{
ClientID: cfg.OidcClientID,
ClientSecret: cfg.OidcClientSecret,
Scopes: []string{scope},
TokenURL: cfg.OidcTokenEndpointURL,
EndpointParams: eps,
}
return &OidcAuthProvider{
BaseConfig: baseCfg,
tokenGenerator: tokenGenerator,
}
}
func (auth *OidcAuthProvider) generateAccessToken() (accessToken string, err error) {
tokenObj, err := auth.tokenGenerator.Token(context.Background())
if err != nil {
return "", fmt.Errorf("couldn't generate OIDC token for login: %v", err)
}
return tokenObj.AccessToken, nil
}
func (auth *OidcAuthProvider) SetLogin(loginMsg *msg.Login) (err error) {
loginMsg.PrivilegeKey, err = auth.generateAccessToken()
return err
}
func (auth *OidcAuthProvider) SetPing(pingMsg *msg.Ping) (err error) {
if !auth.AuthenticateHeartBeats {
return nil
}
pingMsg.PrivilegeKey, err = auth.generateAccessToken()
return err
}
func (auth *OidcAuthProvider) SetNewWorkConn(newWorkConnMsg *msg.NewWorkConn) (err error) {
if !auth.AuthenticateNewWorkConns {
return nil
}
newWorkConnMsg.PrivilegeKey, err = auth.generateAccessToken()
return err
}
type OidcAuthConsumer struct {
BaseConfig
verifier *oidc.IDTokenVerifier
subjectFromLogin string
}
func NewOidcAuthVerifier(baseCfg BaseConfig, cfg OidcServerConfig) *OidcAuthConsumer {
provider, err := oidc.NewProvider(context.Background(), cfg.OidcIssuer)
if err != nil {
panic(err)
}
verifierConf := oidc.Config{
ClientID: cfg.OidcAudience,
SkipClientIDCheck: cfg.OidcAudience == "",
SkipExpiryCheck: cfg.OidcSkipExpiryCheck,
SkipIssuerCheck: cfg.OidcSkipIssuerCheck,
}
return &OidcAuthConsumer{
BaseConfig: baseCfg,
verifier: provider.Verifier(&verifierConf),
}
}
func (auth *OidcAuthConsumer) VerifyLogin(loginMsg *msg.Login) (err error) {
token, err := auth.verifier.Verify(context.Background(), loginMsg.PrivilegeKey)
if err != nil {
return fmt.Errorf("invalid OIDC token in login: %v", err)
}
auth.subjectFromLogin = token.Subject
return nil
}
func (auth *OidcAuthConsumer) verifyPostLoginToken(privilegeKey string) (err error) {
token, err := auth.verifier.Verify(context.Background(), privilegeKey)
if err != nil {
return fmt.Errorf("invalid OIDC token in ping: %v", err)
}
if token.Subject != auth.subjectFromLogin {
return fmt.Errorf("received different OIDC subject in login and ping. "+
"original subject: %s, "+
"new subject: %s",
auth.subjectFromLogin, token.Subject)
}
return nil
}
func (auth *OidcAuthConsumer) VerifyPing(pingMsg *msg.Ping) (err error) {
if !auth.AuthenticateHeartBeats {
return nil
}
return auth.verifyPostLoginToken(pingMsg.PrivilegeKey)
}
func (auth *OidcAuthConsumer) VerifyNewWorkConn(newWorkConnMsg *msg.NewWorkConn) (err error) {
if !auth.AuthenticateNewWorkConns {
return nil
}
return auth.verifyPostLoginToken(newWorkConnMsg.PrivilegeKey)
}