forgejo/services/auth/reverseproxy.go
zeripath 5d2e11eedb
Refactor: Move login out of models (#16199)
`models` does far too much. In particular it handles all `UserSignin`.

It shouldn't be responsible for calling LDAP, SMTP or PAM for signing in.

Therefore we should move this code out of `models`.

This code has to depend on `models` - therefore it belongs in `services`.

There is a package in `services` called `auth` and clearly this functionality belongs in there.

Plan:

- [x] Change `auth.Auth` to `auth.Method` - as they represent methods of authentication.
- [x] Move `models.UserSignIn` into `auth`
- [x] Move `models.ExternalUserLogin`
- [x] Move most of the `LoginVia*` methods to `auth` or subpackages
- [x] Move Resynchronize functionality to `auth`
  - Involved some restructuring of `models/ssh_key.go` to reduce the size of this massive file and simplify its files.
- [x] Move the rest of the LDAP functionality in to the ldap subpackage
- [x] Re-factor the login sources to express an interfaces `auth.Source`?
  - I've done this through some smaller interfaces Authenticator and Synchronizable - which would allow us to extend things in future
- [x] Now LDAP is out of models - need to think about modules/auth/ldap and I think all of that functionality might just be moveable
- [x] Similarly a lot Oauth2 functionality need not be in models too and should be moved to services/auth/source/oauth2
  - [x] modules/auth/oauth2/oauth2.go uses xorm... This is naughty - probably need to move this into models.
  - [x] models/oauth2.go - mostly should be in modules/auth/oauth2 or services/auth/source/oauth2 
- [x] More simplifications of login_source.go may need to be done
- Allow wiring in of notify registration -  *this can now easily be done - but I think we should do it in another PR*  - see #16178 
- More refactors...?
  - OpenID should probably become an auth Method but I think that can be left for another PR
  - Methods should also probably be cleaned up  - again another PR I think.
  - SSPI still needs more refactors.* Rename auth.Auth auth.Method
* Restructure ssh_key.go

- move functions from models/user.go that relate to ssh_key to ssh_key
- split ssh_key.go to try create clearer function domains for allow for
future refactors here.

Signed-off-by: Andrew Thornton <art27@cantab.net>
2021-07-24 11:16:34 +01:00

117 lines
3.6 KiB
Go

// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package auth
import (
"net/http"
"strings"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/web/middleware"
gouuid "github.com/google/uuid"
)
// Ensure the struct implements the interface.
var (
_ Method = &ReverseProxy{}
_ Named = &ReverseProxy{}
)
// ReverseProxy implements the Auth interface, but actually relies on
// a reverse proxy for authentication of users.
// On successful authentication the proxy is expected to populate the username in the
// "setting.ReverseProxyAuthUser" header. Optionally it can also populate the email of the
// user in the "setting.ReverseProxyAuthEmail" header.
type ReverseProxy struct {
}
// getUserName extracts the username from the "setting.ReverseProxyAuthUser" header
func (r *ReverseProxy) getUserName(req *http.Request) string {
webAuthUser := strings.TrimSpace(req.Header.Get(setting.ReverseProxyAuthUser))
if len(webAuthUser) == 0 {
return ""
}
return webAuthUser
}
// Name represents the name of auth method
func (r *ReverseProxy) Name() string {
return "reverse_proxy"
}
// Verify extracts the username from the "setting.ReverseProxyAuthUser" header
// of the request and returns the corresponding user object for that name.
// Verification of header data is not performed as it should have already been done by
// the revese proxy.
// If a username is available in the "setting.ReverseProxyAuthUser" header an existing
// user object is returned (populated with username or email found in header).
// Returns nil if header is empty.
func (r *ReverseProxy) Verify(req *http.Request, w http.ResponseWriter, store DataStore, sess SessionStore) *models.User {
username := r.getUserName(req)
if len(username) == 0 {
return nil
}
log.Trace("ReverseProxy Authorization: Found username: %s", username)
user, err := models.GetUserByName(username)
if err != nil {
if !models.IsErrUserNotExist(err) || !r.isAutoRegisterAllowed() {
log.Error("GetUserByName: %v", err)
return nil
}
user = r.newUser(req)
}
// Make sure requests to API paths, attachment downloads, git and LFS do not create a new session
if !middleware.IsAPIPath(req) && !isAttachmentDownload(req) && !isGitRawOrLFSPath(req) {
if sess != nil && (sess.Get("uid") == nil || sess.Get("uid").(int64) != user.ID) {
handleSignIn(w, req, sess, user)
}
}
store.GetData()["IsReverseProxy"] = true
log.Trace("ReverseProxy Authorization: Logged in user %-v", user)
return user
}
// isAutoRegisterAllowed checks if EnableReverseProxyAutoRegister setting is true
func (r *ReverseProxy) isAutoRegisterAllowed() bool {
return setting.Service.EnableReverseProxyAutoRegister
}
// newUser creates a new user object for the purpose of automatic registration
// and populates its name and email with the information present in request headers.
func (r *ReverseProxy) newUser(req *http.Request) *models.User {
username := r.getUserName(req)
if len(username) == 0 {
return nil
}
email := gouuid.New().String() + "@localhost"
if setting.Service.EnableReverseProxyEmail {
webAuthEmail := req.Header.Get(setting.ReverseProxyAuthEmail)
if len(webAuthEmail) > 0 {
email = webAuthEmail
}
}
user := &models.User{
Name: username,
Email: email,
IsActive: true,
}
if err := models.CreateUser(user); err != nil {
// FIXME: should I create a system notice?
log.Error("CreateUser: %v", err)
return nil
}
return user
}