forgejo/services/auth/basic.go
Giteabot a8e505a44b
Unify two factor check (#27915) (#27929)
Backport #27915 by @KN4CK3R

Fixes #27819

We have support for two factor logins with the normal web login and with
basic auth. For basic auth the two factor check was implemented at three
different places and you need to know that this check is necessary. This
PR moves the check into the basic auth itself.

Co-authored-by: KN4CK3R <admin@oldschoolhack.me>
2023-11-06 18:07:22 +00:00

161 lines
4.7 KiB
Go

// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package auth
import (
"net/http"
"strings"
actions_model "code.gitea.io/gitea/models/actions"
auth_model "code.gitea.io/gitea/models/auth"
user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/timeutil"
"code.gitea.io/gitea/modules/util"
"code.gitea.io/gitea/modules/web/middleware"
)
// Ensure the struct implements the interface.
var (
_ Method = &Basic{}
)
// BasicMethodName is the constant name of the basic authentication method
const BasicMethodName = "basic"
// Basic implements the Auth interface and authenticates requests (API requests
// only) by looking for Basic authentication data or "x-oauth-basic" token in the "Authorization"
// header.
type Basic struct{}
// Name represents the name of auth method
func (b *Basic) Name() string {
return BasicMethodName
}
// Verify extracts and validates Basic data (username and password/token) from the
// "Authorization" header of the request and returns the corresponding user object for that
// name/token on successful validation.
// Returns nil if header is empty or validation fails.
func (b *Basic) Verify(req *http.Request, w http.ResponseWriter, store DataStore, sess SessionStore) (*user_model.User, error) {
// Basic authentication should only fire on API, Download or on Git or LFSPaths
if !middleware.IsAPIPath(req) && !isContainerPath(req) && !isAttachmentDownload(req) && !isGitRawOrAttachOrLFSPath(req) {
return nil, nil
}
baHead := req.Header.Get("Authorization")
if len(baHead) == 0 {
return nil, nil
}
auths := strings.SplitN(baHead, " ", 2)
if len(auths) != 2 || (strings.ToLower(auths[0]) != "basic") {
return nil, nil
}
uname, passwd, _ := base.BasicAuthDecode(auths[1])
// Check if username or password is a token
isUsernameToken := len(passwd) == 0 || passwd == "x-oauth-basic"
// Assume username is token
authToken := uname
if !isUsernameToken {
log.Trace("Basic Authorization: Attempting login for: %s", uname)
// Assume password is token
authToken = passwd
} else {
log.Trace("Basic Authorization: Attempting login with username as token")
}
// check oauth2 token
uid := CheckOAuthAccessToken(req.Context(), authToken)
if uid != 0 {
log.Trace("Basic Authorization: Valid OAuthAccessToken for user[%d]", uid)
u, err := user_model.GetUserByID(req.Context(), uid)
if err != nil {
log.Error("GetUserByID: %v", err)
return nil, err
}
store.GetData()["IsApiToken"] = true
return u, nil
}
// check personal access token
token, err := auth_model.GetAccessTokenBySHA(req.Context(), authToken)
if err == nil {
log.Trace("Basic Authorization: Valid AccessToken for user[%d]", uid)
u, err := user_model.GetUserByID(req.Context(), token.UID)
if err != nil {
log.Error("GetUserByID: %v", err)
return nil, err
}
token.UpdatedUnix = timeutil.TimeStampNow()
if err = auth_model.UpdateAccessToken(req.Context(), token); err != nil {
log.Error("UpdateAccessToken: %v", err)
}
store.GetData()["IsApiToken"] = true
store.GetData()["ApiTokenScope"] = token.Scope
return u, nil
} else if !auth_model.IsErrAccessTokenNotExist(err) && !auth_model.IsErrAccessTokenEmpty(err) {
log.Error("GetAccessTokenBySha: %v", err)
}
// check task token
task, err := actions_model.GetRunningTaskByToken(req.Context(), authToken)
if err == nil && task != nil {
log.Trace("Basic Authorization: Valid AccessToken for task[%d]", task.ID)
store.GetData()["IsActionsToken"] = true
store.GetData()["ActionsTaskID"] = task.ID
return user_model.NewActionsUser(), nil
}
if !setting.Service.EnableBasicAuth {
return nil, nil
}
log.Trace("Basic Authorization: Attempting SignIn for %s", uname)
u, source, err := UserSignIn(req.Context(), uname, passwd)
if err != nil {
if !user_model.IsErrUserNotExist(err) {
log.Error("UserSignIn: %v", err)
}
return nil, err
}
if skipper, ok := source.Cfg.(LocalTwoFASkipper); !ok || !skipper.IsSkipLocalTwoFA() {
if err := validateTOTP(req, u); err != nil {
return nil, err
}
}
log.Trace("Basic Authorization: Logged in user %-v", u)
return u, nil
}
func validateTOTP(req *http.Request, u *user_model.User) error {
twofa, err := auth_model.GetTwoFactorByUID(req.Context(), u.ID)
if err != nil {
if auth_model.IsErrTwoFactorNotEnrolled(err) {
// No 2FA enrollment for this user
return nil
}
return err
}
if ok, err := twofa.ValidateTOTP(req.Header.Get("X-Gitea-OTP")); err != nil {
return err
} else if !ok {
return util.NewInvalidArgumentErrorf("invalid provided OTP")
}
return nil
}