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https://github.com/go-gitea/gitea
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This is "minimal" in the sense that only the Authorization Code Flow from OpenID Connect Core is implemented. No discovery, no configuration endpoint, and no user scope management. OpenID Connect is an extension to the (already implemented) OAuth 2.0 protocol, and essentially an `id_token` JWT is added to the access token endpoint response when using the Authorization Code Flow. I also added support for the "nonce" field since it is required to be used in the id_token if the client decides to include it in its initial request. In order to enable this extension an OAuth 2.0 scope containing "openid" is needed. Other OAuth 2.0 requests should not be impacted by this change. This minimal implementation is enough to enable single sign-on (SSO) for other sites, e.g. by using something like `mod_auth_openidc` to only allow access to a CI server if a user has logged into Gitea. Fixes: #1310 Co-authored-by: 6543 <6543@obermui.de> Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com> Co-authored-by: zeripath <art27@cantab.net>
559 lines
18 KiB
Go
559 lines
18 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package user
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import (
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"encoding/base64"
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"fmt"
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"html"
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"net/url"
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"strings"
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"code.gitea.io/gitea/models"
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"code.gitea.io/gitea/modules/auth"
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"code.gitea.io/gitea/modules/base"
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"code.gitea.io/gitea/modules/context"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/timeutil"
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"gitea.com/macaron/binding"
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"github.com/dgrijalva/jwt-go"
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)
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const (
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tplGrantAccess base.TplName = "user/auth/grant"
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tplGrantError base.TplName = "user/auth/grant_error"
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)
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// TODO move error and responses to SDK or models
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// AuthorizeErrorCode represents an error code specified in RFC 6749
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type AuthorizeErrorCode string
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const (
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// ErrorCodeInvalidRequest represents the according error in RFC 6749
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ErrorCodeInvalidRequest AuthorizeErrorCode = "invalid_request"
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// ErrorCodeUnauthorizedClient represents the according error in RFC 6749
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ErrorCodeUnauthorizedClient AuthorizeErrorCode = "unauthorized_client"
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// ErrorCodeAccessDenied represents the according error in RFC 6749
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ErrorCodeAccessDenied AuthorizeErrorCode = "access_denied"
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// ErrorCodeUnsupportedResponseType represents the according error in RFC 6749
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ErrorCodeUnsupportedResponseType AuthorizeErrorCode = "unsupported_response_type"
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// ErrorCodeInvalidScope represents the according error in RFC 6749
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ErrorCodeInvalidScope AuthorizeErrorCode = "invalid_scope"
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// ErrorCodeServerError represents the according error in RFC 6749
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ErrorCodeServerError AuthorizeErrorCode = "server_error"
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// ErrorCodeTemporaryUnavailable represents the according error in RFC 6749
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ErrorCodeTemporaryUnavailable AuthorizeErrorCode = "temporarily_unavailable"
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)
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// AuthorizeError represents an error type specified in RFC 6749
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type AuthorizeError struct {
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ErrorCode AuthorizeErrorCode `json:"error" form:"error"`
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ErrorDescription string
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State string
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}
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// Error returns the error message
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func (err AuthorizeError) Error() string {
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return fmt.Sprintf("%s: %s", err.ErrorCode, err.ErrorDescription)
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}
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// AccessTokenErrorCode represents an error code specified in RFC 6749
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type AccessTokenErrorCode string
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const (
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// AccessTokenErrorCodeInvalidRequest represents an error code specified in RFC 6749
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AccessTokenErrorCodeInvalidRequest AccessTokenErrorCode = "invalid_request"
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// AccessTokenErrorCodeInvalidClient represents an error code specified in RFC 6749
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AccessTokenErrorCodeInvalidClient = "invalid_client"
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// AccessTokenErrorCodeInvalidGrant represents an error code specified in RFC 6749
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AccessTokenErrorCodeInvalidGrant = "invalid_grant"
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// AccessTokenErrorCodeUnauthorizedClient represents an error code specified in RFC 6749
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AccessTokenErrorCodeUnauthorizedClient = "unauthorized_client"
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// AccessTokenErrorCodeUnsupportedGrantType represents an error code specified in RFC 6749
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AccessTokenErrorCodeUnsupportedGrantType = "unsupported_grant_type"
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// AccessTokenErrorCodeInvalidScope represents an error code specified in RFC 6749
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AccessTokenErrorCodeInvalidScope = "invalid_scope"
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)
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// AccessTokenError represents an error response specified in RFC 6749
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type AccessTokenError struct {
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ErrorCode AccessTokenErrorCode `json:"error" form:"error"`
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ErrorDescription string `json:"error_description"`
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}
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// Error returns the error message
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func (err AccessTokenError) Error() string {
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return fmt.Sprintf("%s: %s", err.ErrorCode, err.ErrorDescription)
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}
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// TokenType specifies the kind of token
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type TokenType string
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const (
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// TokenTypeBearer represents a token type specified in RFC 6749
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TokenTypeBearer TokenType = "bearer"
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// TokenTypeMAC represents a token type specified in RFC 6749
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TokenTypeMAC = "mac"
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)
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// AccessTokenResponse represents a successful access token response
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type AccessTokenResponse struct {
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AccessToken string `json:"access_token"`
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TokenType TokenType `json:"token_type"`
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ExpiresIn int64 `json:"expires_in"`
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RefreshToken string `json:"refresh_token"`
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IDToken string `json:"id_token,omitempty"`
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}
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func newAccessTokenResponse(grant *models.OAuth2Grant, clientSecret string) (*AccessTokenResponse, *AccessTokenError) {
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if setting.OAuth2.InvalidateRefreshTokens {
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if err := grant.IncreaseCounter(); err != nil {
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return nil, &AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidGrant,
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ErrorDescription: "cannot increase the grant counter",
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}
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}
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}
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// generate access token to access the API
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expirationDate := timeutil.TimeStampNow().Add(setting.OAuth2.AccessTokenExpirationTime)
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accessToken := &models.OAuth2Token{
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GrantID: grant.ID,
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Type: models.TypeAccessToken,
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StandardClaims: jwt.StandardClaims{
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ExpiresAt: expirationDate.AsTime().Unix(),
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},
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}
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signedAccessToken, err := accessToken.SignToken()
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if err != nil {
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return nil, &AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidRequest,
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ErrorDescription: "cannot sign token",
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}
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}
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// generate refresh token to request an access token after it expired later
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refreshExpirationDate := timeutil.TimeStampNow().Add(setting.OAuth2.RefreshTokenExpirationTime * 60 * 60).AsTime().Unix()
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refreshToken := &models.OAuth2Token{
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GrantID: grant.ID,
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Counter: grant.Counter,
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Type: models.TypeRefreshToken,
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StandardClaims: jwt.StandardClaims{
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ExpiresAt: refreshExpirationDate,
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},
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}
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signedRefreshToken, err := refreshToken.SignToken()
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if err != nil {
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return nil, &AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidRequest,
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ErrorDescription: "cannot sign token",
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}
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}
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// generate OpenID Connect id_token
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signedIDToken := ""
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if grant.ScopeContains("openid") {
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app, err := models.GetOAuth2ApplicationByID(grant.ApplicationID)
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if err != nil {
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return nil, &AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidRequest,
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ErrorDescription: "cannot find application",
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}
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}
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idToken := &models.OIDCToken{
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StandardClaims: jwt.StandardClaims{
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ExpiresAt: expirationDate.AsTime().Unix(),
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Issuer: setting.AppURL,
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Audience: app.ClientID,
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Subject: fmt.Sprint(grant.UserID),
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},
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Nonce: grant.Nonce,
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}
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signedIDToken, err = idToken.SignToken(clientSecret)
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if err != nil {
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return nil, &AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidRequest,
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ErrorDescription: "cannot sign token",
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}
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}
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}
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return &AccessTokenResponse{
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AccessToken: signedAccessToken,
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TokenType: TokenTypeBearer,
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ExpiresIn: setting.OAuth2.AccessTokenExpirationTime,
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RefreshToken: signedRefreshToken,
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IDToken: signedIDToken,
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}, nil
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}
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// AuthorizeOAuth manages authorize requests
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func AuthorizeOAuth(ctx *context.Context, form auth.AuthorizationForm) {
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errs := binding.Errors{}
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errs = form.Validate(ctx.Context, errs)
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if len(errs) > 0 {
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errstring := ""
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for _, e := range errs {
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errstring += e.Error() + "\n"
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}
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ctx.ServerError("AuthorizeOAuth: Validate: ", fmt.Errorf("errors occurred during validation: %s", errstring))
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return
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}
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app, err := models.GetOAuth2ApplicationByClientID(form.ClientID)
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if err != nil {
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if models.IsErrOauthClientIDInvalid(err) {
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handleAuthorizeError(ctx, AuthorizeError{
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ErrorCode: ErrorCodeUnauthorizedClient,
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ErrorDescription: "Client ID not registered",
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State: form.State,
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}, "")
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return
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}
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ctx.ServerError("GetOAuth2ApplicationByClientID", err)
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return
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}
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if err := app.LoadUser(); err != nil {
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ctx.ServerError("LoadUser", err)
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return
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}
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if !app.ContainsRedirectURI(form.RedirectURI) {
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handleAuthorizeError(ctx, AuthorizeError{
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ErrorCode: ErrorCodeInvalidRequest,
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ErrorDescription: "Unregistered Redirect URI",
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State: form.State,
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}, "")
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return
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}
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if form.ResponseType != "code" {
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handleAuthorizeError(ctx, AuthorizeError{
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ErrorCode: ErrorCodeUnsupportedResponseType,
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ErrorDescription: "Only code response type is supported.",
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State: form.State,
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}, form.RedirectURI)
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return
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}
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// pkce support
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switch form.CodeChallengeMethod {
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case "S256":
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case "plain":
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if err := ctx.Session.Set("CodeChallengeMethod", form.CodeChallengeMethod); err != nil {
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handleAuthorizeError(ctx, AuthorizeError{
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ErrorCode: ErrorCodeServerError,
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ErrorDescription: "cannot set code challenge method",
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State: form.State,
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}, form.RedirectURI)
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return
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}
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if err := ctx.Session.Set("CodeChallengeMethod", form.CodeChallenge); err != nil {
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handleAuthorizeError(ctx, AuthorizeError{
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ErrorCode: ErrorCodeServerError,
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ErrorDescription: "cannot set code challenge",
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State: form.State,
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}, form.RedirectURI)
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return
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}
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// Here we're just going to try to release the session early
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if err := ctx.Session.Release(); err != nil {
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// we'll tolerate errors here as they *should* get saved elsewhere
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log.Error("Unable to save changes to the session: %v", err)
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}
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case "":
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break
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default:
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handleAuthorizeError(ctx, AuthorizeError{
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ErrorCode: ErrorCodeInvalidRequest,
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ErrorDescription: "unsupported code challenge method",
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State: form.State,
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}, form.RedirectURI)
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return
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}
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grant, err := app.GetGrantByUserID(ctx.User.ID)
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if err != nil {
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handleServerError(ctx, form.State, form.RedirectURI)
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return
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}
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// Redirect if user already granted access
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if grant != nil {
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code, err := grant.GenerateNewAuthorizationCode(form.RedirectURI, form.CodeChallenge, form.CodeChallengeMethod)
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if err != nil {
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handleServerError(ctx, form.State, form.RedirectURI)
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return
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}
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redirect, err := code.GenerateRedirectURI(form.State)
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if err != nil {
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handleServerError(ctx, form.State, form.RedirectURI)
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return
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}
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// Update nonce to reflect the new session
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if len(form.Nonce) > 0 {
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err := grant.SetNonce(form.Nonce)
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if err != nil {
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log.Error("Unable to update nonce: %v", err)
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}
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}
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ctx.Redirect(redirect.String(), 302)
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return
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}
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// show authorize page to grant access
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ctx.Data["Application"] = app
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ctx.Data["RedirectURI"] = form.RedirectURI
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ctx.Data["State"] = form.State
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ctx.Data["Scope"] = form.Scope
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ctx.Data["Nonce"] = form.Nonce
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ctx.Data["ApplicationUserLink"] = "<a href=\"" + html.EscapeString(setting.AppURL) + html.EscapeString(url.PathEscape(app.User.LowerName)) + "\">@" + html.EscapeString(app.User.Name) + "</a>"
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ctx.Data["ApplicationRedirectDomainHTML"] = "<strong>" + html.EscapeString(form.RedirectURI) + "</strong>"
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// TODO document SESSION <=> FORM
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err = ctx.Session.Set("client_id", app.ClientID)
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if err != nil {
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handleServerError(ctx, form.State, form.RedirectURI)
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log.Error(err.Error())
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return
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}
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err = ctx.Session.Set("redirect_uri", form.RedirectURI)
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if err != nil {
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handleServerError(ctx, form.State, form.RedirectURI)
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log.Error(err.Error())
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return
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}
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err = ctx.Session.Set("state", form.State)
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if err != nil {
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handleServerError(ctx, form.State, form.RedirectURI)
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log.Error(err.Error())
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return
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}
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// Here we're just going to try to release the session early
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if err := ctx.Session.Release(); err != nil {
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// we'll tolerate errors here as they *should* get saved elsewhere
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log.Error("Unable to save changes to the session: %v", err)
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}
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ctx.HTML(200, tplGrantAccess)
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}
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// GrantApplicationOAuth manages the post request submitted when a user grants access to an application
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func GrantApplicationOAuth(ctx *context.Context, form auth.GrantApplicationForm) {
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if ctx.Session.Get("client_id") != form.ClientID || ctx.Session.Get("state") != form.State ||
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ctx.Session.Get("redirect_uri") != form.RedirectURI {
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ctx.Error(400)
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return
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}
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app, err := models.GetOAuth2ApplicationByClientID(form.ClientID)
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if err != nil {
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ctx.ServerError("GetOAuth2ApplicationByClientID", err)
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return
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}
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grant, err := app.CreateGrant(ctx.User.ID, form.Scope)
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if err != nil {
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handleAuthorizeError(ctx, AuthorizeError{
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State: form.State,
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ErrorDescription: "cannot create grant for user",
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ErrorCode: ErrorCodeServerError,
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}, form.RedirectURI)
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return
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}
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if len(form.Nonce) > 0 {
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err := grant.SetNonce(form.Nonce)
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if err != nil {
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log.Error("Unable to update nonce: %v", err)
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}
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}
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var codeChallenge, codeChallengeMethod string
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codeChallenge, _ = ctx.Session.Get("CodeChallenge").(string)
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codeChallengeMethod, _ = ctx.Session.Get("CodeChallengeMethod").(string)
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code, err := grant.GenerateNewAuthorizationCode(form.RedirectURI, codeChallenge, codeChallengeMethod)
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if err != nil {
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handleServerError(ctx, form.State, form.RedirectURI)
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return
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}
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redirect, err := code.GenerateRedirectURI(form.State)
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if err != nil {
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handleServerError(ctx, form.State, form.RedirectURI)
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return
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}
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ctx.Redirect(redirect.String(), 302)
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}
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// AccessTokenOAuth manages all access token requests by the client
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func AccessTokenOAuth(ctx *context.Context, form auth.AccessTokenForm) {
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if form.ClientID == "" {
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authHeader := ctx.Req.Header.Get("Authorization")
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authContent := strings.SplitN(authHeader, " ", 2)
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if len(authContent) == 2 && authContent[0] == "Basic" {
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payload, err := base64.StdEncoding.DecodeString(authContent[1])
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if err != nil {
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handleAccessTokenError(ctx, AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidRequest,
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ErrorDescription: "cannot parse basic auth header",
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})
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return
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}
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pair := strings.SplitN(string(payload), ":", 2)
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if len(pair) != 2 {
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handleAccessTokenError(ctx, AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidRequest,
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ErrorDescription: "cannot parse basic auth header",
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})
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return
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}
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form.ClientID = pair[0]
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form.ClientSecret = pair[1]
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}
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}
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switch form.GrantType {
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case "refresh_token":
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handleRefreshToken(ctx, form)
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return
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case "authorization_code":
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handleAuthorizationCode(ctx, form)
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return
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default:
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handleAccessTokenError(ctx, AccessTokenError{
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ErrorCode: AccessTokenErrorCodeUnsupportedGrantType,
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ErrorDescription: "Only refresh_token or authorization_code grant type is supported",
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})
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}
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}
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func handleRefreshToken(ctx *context.Context, form auth.AccessTokenForm) {
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token, err := models.ParseOAuth2Token(form.RefreshToken)
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if err != nil {
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handleAccessTokenError(ctx, AccessTokenError{
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ErrorCode: AccessTokenErrorCodeUnauthorizedClient,
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ErrorDescription: "client is not authorized",
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})
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return
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}
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// get grant before increasing counter
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grant, err := models.GetOAuth2GrantByID(token.GrantID)
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if err != nil || grant == nil {
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handleAccessTokenError(ctx, AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidGrant,
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ErrorDescription: "grant does not exist",
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})
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return
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}
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// check if token got already used
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if setting.OAuth2.InvalidateRefreshTokens && (grant.Counter != token.Counter || token.Counter == 0) {
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handleAccessTokenError(ctx, AccessTokenError{
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ErrorCode: AccessTokenErrorCodeUnauthorizedClient,
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ErrorDescription: "token was already used",
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})
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log.Warn("A client tried to use a refresh token for grant_id = %d was used twice!", grant.ID)
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return
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}
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accessToken, tokenErr := newAccessTokenResponse(grant, form.ClientSecret)
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if tokenErr != nil {
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handleAccessTokenError(ctx, *tokenErr)
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return
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}
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ctx.JSON(200, accessToken)
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}
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func handleAuthorizationCode(ctx *context.Context, form auth.AccessTokenForm) {
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app, err := models.GetOAuth2ApplicationByClientID(form.ClientID)
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if err != nil {
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handleAccessTokenError(ctx, AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidClient,
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ErrorDescription: fmt.Sprintf("cannot load client with client id: '%s'", form.ClientID),
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})
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return
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}
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if !app.ValidateClientSecret([]byte(form.ClientSecret)) {
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handleAccessTokenError(ctx, AccessTokenError{
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ErrorCode: AccessTokenErrorCodeUnauthorizedClient,
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ErrorDescription: "client is not authorized",
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})
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return
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}
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if form.RedirectURI != "" && !app.ContainsRedirectURI(form.RedirectURI) {
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handleAccessTokenError(ctx, AccessTokenError{
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ErrorCode: AccessTokenErrorCodeUnauthorizedClient,
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ErrorDescription: "client is not authorized",
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})
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return
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}
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authorizationCode, err := models.GetOAuth2AuthorizationByCode(form.Code)
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if err != nil || authorizationCode == nil {
|
|
handleAccessTokenError(ctx, AccessTokenError{
|
|
ErrorCode: AccessTokenErrorCodeUnauthorizedClient,
|
|
ErrorDescription: "client is not authorized",
|
|
})
|
|
return
|
|
}
|
|
// check if code verifier authorizes the client, PKCE support
|
|
if !authorizationCode.ValidateCodeChallenge(form.CodeVerifier) {
|
|
handleAccessTokenError(ctx, AccessTokenError{
|
|
ErrorCode: AccessTokenErrorCodeUnauthorizedClient,
|
|
ErrorDescription: "client is not authorized",
|
|
})
|
|
return
|
|
}
|
|
// check if granted for this application
|
|
if authorizationCode.Grant.ApplicationID != app.ID {
|
|
handleAccessTokenError(ctx, AccessTokenError{
|
|
ErrorCode: AccessTokenErrorCodeInvalidGrant,
|
|
ErrorDescription: "invalid grant",
|
|
})
|
|
return
|
|
}
|
|
// remove token from database to deny duplicate usage
|
|
if err := authorizationCode.Invalidate(); err != nil {
|
|
handleAccessTokenError(ctx, AccessTokenError{
|
|
ErrorCode: AccessTokenErrorCodeInvalidRequest,
|
|
ErrorDescription: "cannot proceed your request",
|
|
})
|
|
}
|
|
resp, tokenErr := newAccessTokenResponse(authorizationCode.Grant, form.ClientSecret)
|
|
if tokenErr != nil {
|
|
handleAccessTokenError(ctx, *tokenErr)
|
|
return
|
|
}
|
|
// send successful response
|
|
ctx.JSON(200, resp)
|
|
}
|
|
|
|
func handleAccessTokenError(ctx *context.Context, acErr AccessTokenError) {
|
|
ctx.JSON(400, acErr)
|
|
}
|
|
|
|
func handleServerError(ctx *context.Context, state string, redirectURI string) {
|
|
handleAuthorizeError(ctx, AuthorizeError{
|
|
ErrorCode: ErrorCodeServerError,
|
|
ErrorDescription: "A server error occurred",
|
|
State: state,
|
|
}, redirectURI)
|
|
}
|
|
|
|
func handleAuthorizeError(ctx *context.Context, authErr AuthorizeError, redirectURI string) {
|
|
if redirectURI == "" {
|
|
log.Warn("Authorization failed: %v", authErr.ErrorDescription)
|
|
ctx.Data["Error"] = authErr
|
|
ctx.HTML(400, tplGrantError)
|
|
return
|
|
}
|
|
redirect, err := url.Parse(redirectURI)
|
|
if err != nil {
|
|
ctx.ServerError("url.Parse", err)
|
|
return
|
|
}
|
|
q := redirect.Query()
|
|
q.Set("error", string(authErr.ErrorCode))
|
|
q.Set("error_description", authErr.ErrorDescription)
|
|
q.Set("state", authErr.State)
|
|
redirect.RawQuery = q.Encode()
|
|
ctx.Redirect(redirect.String(), 302)
|
|
}
|