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// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package auth
import (
"errors"
"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
}
hashWebAuthn, err := auth_model.HasWebAuthnRegistrationsByUID(req.Context(), u.ID)
if err != nil {
log.Error("HasWebAuthnRegistrationsByUID: %v", err)
return nil, err
}
if hashWebAuthn {
return nil, errors.New("Basic authorization is not allowed while having security keys enrolled")
}
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 getOtpHeader(header http.Header) string {
otpHeader := header.Get("X-Gitea-OTP")
if forgejoHeader := header.Get("X-Forgejo-OTP"); forgejoHeader != "" {
otpHeader = forgejoHeader
}
return otpHeader
}
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(getOtpHeader(req.Header)); err != nil {
return err
} else if !ok {
return util.NewInvalidArgumentErrorf("invalid provided OTP")
}
return nil
}
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