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forgejo/services/remote/promote.go
Earl Warren 7cabc5670d
Implement remote user login source and promotion to regular user
A remote user (UserTypeRemoteUser) is a placeholder that can be
promoted to a regular user (UserTypeIndividual). It represents users
that exist somewhere else. Although the UserTypeRemoteUser already
exists in Forgejo, it is neither used or documented.

A new login type / source (Remote) is introduced and set to be the login type
of remote users.

Type        UserTypeRemoteUser
LogingType  Remote

The association between a remote user and its counterpart in another
environment (for instance another forge) is via the OAuth2 login
source:

LoginName   set to the unique identifier relative to the login source
LoginSource set to the identifier of the remote source

For instance when migrating from GitLab.com, a user can be created as
if it was authenticated using GitLab.com as an OAuth2 authentication
source.

When a user authenticates to Forejo from the same authentication
source and the identifier match, the remote user is promoted to a
regular user. For instance if 43 is the ID of the GitLab.com OAuth2
login source, 88 is the ID of the Remote loging source, and 48323
is the identifier of the foo user:

Type        UserTypeRemoteUser
LogingType  Remote
LoginName   48323
LoginSource 88
Email       (empty)
Name        foo

Will be promoted to the following when the user foo authenticates to
the Forgejo instance using GitLab.com as an OAuth2 provider. All users
with a LoginType of Remote and a LoginName of 48323 are examined. If
the LoginSource has a provider name that matches the provider name of
GitLab.com (usually just "gitlab"), it is a match and can be promoted.

The email is obtained via the OAuth2 provider and the user set to:

Type        UserTypeIndividual
LogingType  OAuth2
LoginName   48323
LoginSource 43
Email       foo@example.com
Name        foo

Note: the Remote login source is an indirection to the actual login
source, i.e. the provider string my be set to a login source that does
not exist yet.
2024-04-25 13:03:49 +02:00

133 lines
4.7 KiB
Go

// Copyright Earl Warren <contact@earl-warren.org>
// SPDX-License-Identifier: MIT
package remote
import (
"context"
auth_model "code.gitea.io/gitea/models/auth"
"code.gitea.io/gitea/models/db"
user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/services/auth/source/oauth2"
remote_source "code.gitea.io/gitea/services/auth/source/remote"
)
type Reason int
const (
ReasonNoMatch Reason = iota
ReasonNotAuth2
ReasonBadAuth2
ReasonLoginNameNotExists
ReasonNotRemote
ReasonEmailIsSet
ReasonNoSource
ReasonSourceWrongType
ReasonCanPromote
ReasonPromoted
ReasonUpdateFail
ReasonErrorLoginName
ReasonErrorGetSource
)
func NewReason(level log.Level, reason Reason, message string, args ...any) Reason {
log.Log(1, level, message, args...)
return reason
}
func getUsersByLoginName(ctx context.Context, name string) ([]*user_model.User, error) {
if len(name) == 0 {
return nil, user_model.ErrUserNotExist{Name: name}
}
users := make([]*user_model.User, 0, 5)
return users, db.GetEngine(ctx).
Table("user").
Where("login_name = ? AND login_type = ? AND type = ?", name, auth_model.Remote, user_model.UserTypeRemoteUser).
Find(&users)
}
// The remote user has:
//
// Type UserTypeRemoteUser
// LogingType Remote
// LoginName set to the unique identifier of the originating authentication source
// LoginSource set to the Remote source that can be matched against an OAuth2 source
//
// If the source from which an authentification happens is OAuth2, an existing
// remote user will be promoted to an OAuth2 user provided:
//
// user.LoginName is the same as goth.UserID (argument loginName)
// user.LoginSource has a MatchingSource equals to the name of the OAuth2 provider
//
// Once promoted, the user will be logged in without further interaction from the
// user and will own all repositories, issues, etc. associated with it.
func MaybePromoteRemoteUser(ctx context.Context, source *auth_model.Source, loginName, email string) (promoted bool, reason Reason, err error) {
user, reason, err := getRemoteUserToPromote(ctx, source, loginName, email)
if err != nil || user == nil {
return false, reason, err
}
promote := &user_model.User{
ID: user.ID,
Type: user_model.UserTypeIndividual,
Email: email,
LoginSource: source.ID,
LoginType: source.Type,
}
reason = NewReason(log.DEBUG, ReasonPromoted, "promote user %v: LoginName %v => %v, LoginSource %v => %v, LoginType %v => %v, Email %v => %v", user.ID, user.LoginName, promote.LoginName, user.LoginSource, promote.LoginSource, user.LoginType, promote.LoginType, user.Email, promote.Email)
if err := user_model.UpdateUserCols(ctx, promote, "type", "email", "login_source", "login_type"); err != nil {
return false, ReasonUpdateFail, err
}
return true, reason, nil
}
func getRemoteUserToPromote(ctx context.Context, source *auth_model.Source, loginName, email string) (*user_model.User, Reason, error) {
if !source.IsOAuth2() {
return nil, NewReason(log.DEBUG, ReasonNotAuth2, "source %v is not OAuth2", source), nil
}
oauth2Source, ok := source.Cfg.(*oauth2.Source)
if !ok {
return nil, NewReason(log.ERROR, ReasonBadAuth2, "source claims to be OAuth2 but is not"), nil
}
users, err := getUsersByLoginName(ctx, loginName)
if err != nil {
return nil, NewReason(log.ERROR, ReasonErrorLoginName, "getUserByLoginName('%s') %v", loginName, err), err
}
if len(users) == 0 {
return nil, NewReason(log.ERROR, ReasonLoginNameNotExists, "no user with LoginType UserTypeRemoteUser and LoginName '%s'", loginName), nil
}
reason := ReasonNoSource
for _, u := range users {
userSource, err := auth_model.GetSourceByID(ctx, u.LoginSource)
if err != nil {
if auth_model.IsErrSourceNotExist(err) {
reason = NewReason(log.DEBUG, ReasonNoSource, "source id = %v for user %v not found %v", u.LoginSource, u.ID, err)
continue
}
return nil, NewReason(log.ERROR, ReasonErrorGetSource, "GetSourceByID('%s') %v", u.LoginSource, err), err
}
if u.Email != "" {
reason = NewReason(log.DEBUG, ReasonEmailIsSet, "the user email is already set to '%s'", u.Email)
continue
}
remoteSource, ok := userSource.Cfg.(*remote_source.Source)
if !ok {
reason = NewReason(log.DEBUG, ReasonSourceWrongType, "expected a remote source but got %T %v", userSource, userSource)
continue
}
if oauth2Source.Provider != remoteSource.MatchingSource {
reason = NewReason(log.DEBUG, ReasonNoMatch, "skip OAuth2 source %s because it is different from %s which is the expected match for the remote source %s", oauth2Source.Provider, remoteSource.MatchingSource, remoteSource.URL)
continue
}
return u, ReasonCanPromote, nil
}
return nil, reason, nil
}