136 lines
4.0 KiB
Go
136 lines
4.0 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
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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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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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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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*/
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package oidc
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import (
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"context"
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"fmt"
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"github.com/coreos/go-oidc/v3/oidc"
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"github.com/spf13/viper"
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"github.com/superseriousbusiness/gotosocial/internal/config"
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"golang.org/x/oauth2"
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)
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const (
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// CallbackPath is the API path for receiving callback tokens from external OIDC providers
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CallbackPath = "/auth/callback"
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)
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// IDP contains logic for parsing an OIDC access code into a set of claims by calling an external OIDC provider.
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type IDP interface {
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// HandleCallback accepts a context (pass the context from the http.Request), and an oauth2 code as returned from a successful
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// login through an OIDC provider. It uses the code to request a token from the OIDC provider, which should contain an id_token
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// with a set of claims.
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//
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// Note that this function *does not* verify state. That should be handled by the caller *before* this function is called.
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HandleCallback(ctx context.Context, code string) (*Claims, error)
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// AuthCodeURL returns the proper redirect URL for this IDP, for redirecting requesters to the correct OIDC endpoint.
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AuthCodeURL(state string) string
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}
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type idp struct {
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oauth2Config oauth2.Config
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provider *oidc.Provider
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oidcConf *oidc.Config
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}
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// NewIDP returns a new IDP configured with the given config.
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// If the passed config contains a nil value for the OIDCConfig, or OIDCConfig.Enabled
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// is set to false, then nil, nil will be returned. If OIDCConfig.Enabled is true,
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// then the other OIDC config fields must also be set.
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func NewIDP(ctx context.Context) (IDP, error) {
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keys := config.Keys
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oidcEnabled := viper.GetBool(keys.OIDCEnabled)
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if !oidcEnabled {
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// oidc isn't enabled so we don't need to do anything
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return nil, nil
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}
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// validate config fields
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idpName := viper.GetString(keys.OIDCIdpName)
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if idpName == "" {
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return nil, fmt.Errorf("not set: IDPName")
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}
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issuer := viper.GetString(keys.OIDCIssuer)
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if issuer == "" {
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return nil, fmt.Errorf("not set: Issuer")
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}
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clientID := viper.GetString(keys.OIDCClientID)
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if clientID == "" {
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return nil, fmt.Errorf("not set: ClientID")
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}
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clientSecret := viper.GetString(keys.OIDCClientSecret)
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if clientSecret == "" {
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return nil, fmt.Errorf("not set: ClientSecret")
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}
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scopes := viper.GetStringSlice(keys.OIDCScopes)
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if len(scopes) == 0 {
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return nil, fmt.Errorf("not set: Scopes")
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}
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provider, err := oidc.NewProvider(ctx, issuer)
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if err != nil {
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return nil, err
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}
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protocol := viper.GetString(keys.Protocol)
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host := viper.GetString(keys.Host)
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oauth2Config := oauth2.Config{
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// client_id and client_secret of the client.
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ClientID: clientID,
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ClientSecret: clientSecret,
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// The redirectURL.
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RedirectURL: fmt.Sprintf("%s://%s%s", protocol, host, CallbackPath),
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// Discovery returns the OAuth2 endpoints.
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Endpoint: provider.Endpoint(),
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// "openid" is a required scope for OpenID Connect flows.
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//
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// Other scopes, such as "groups" can be requested.
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Scopes: scopes,
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}
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// create a config for verifier creation
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oidcConf := &oidc.Config{
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ClientID: clientID,
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}
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skipVerification := viper.GetBool(keys.OIDCSkipVerification)
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if skipVerification {
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oidcConf.SkipClientIDCheck = true
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oidcConf.SkipExpiryCheck = true
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oidcConf.SkipIssuerCheck = true
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}
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return &idp{
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oauth2Config: oauth2Config,
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oidcConf: oidcConf,
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provider: provider,
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}, nil
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}
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