forgejo/services/auth/source/smtp/source_authenticate.go
zeripath e29e163737
Improve SMTP authentication and Fix user creation bugs (#16612)
* Improve SMTP authentication, Fix user creation bugs and add LDAP cert/key options

This PR has two parts:

Improvements for SMTP authentication:

* Default to use SMTPS if port is 465, and allow setting of force SMTPS.
* Always use STARTTLS if available
* Provide CRAM-MD5 mechanism
* Add options for HELO hostname disabling
* Add options for providing certificates and keys
* Handle application specific password response as a failed user login
instead of as a 500.

Close #16104

Fix creation of new users:

* A bug was introduced when allowing users to change usernames which
prevents the creation of external users.
* The LoginSource refactor also broke this page.

Close #16104

Signed-off-by: Andrew Thornton <art27@cantab.net>
2021-08-11 21:42:58 +01:00

78 lines
2.1 KiB
Go

// Copyright 2021 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 smtp
import (
"errors"
"net/smtp"
"net/textproto"
"strings"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/util"
)
// Authenticate queries if the provided login/password is authenticates against the SMTP server
// Users will be autoregistered as required
func (source *Source) Authenticate(user *models.User, login, password string) (*models.User, error) {
// Verify allowed domains.
if len(source.AllowedDomains) > 0 {
idx := strings.Index(login, "@")
if idx == -1 {
return nil, models.ErrUserNotExist{Name: login}
} else if !util.IsStringInSlice(login[idx+1:], strings.Split(source.AllowedDomains, ","), true) {
return nil, models.ErrUserNotExist{Name: login}
}
}
var auth smtp.Auth
switch source.Auth {
case PlainAuthentication:
auth = smtp.PlainAuth("", login, password, source.Host)
case LoginAuthentication:
auth = &loginAuthenticator{login, password}
case CRAMMD5Authentication:
auth = smtp.CRAMMD5Auth(login, password)
default:
return nil, errors.New("unsupported SMTP auth type")
}
if err := Authenticate(auth, source); err != nil {
// Check standard error format first,
// then fallback to worse case.
tperr, ok := err.(*textproto.Error)
if (ok && tperr.Code == 535) ||
strings.Contains(err.Error(), "Username and Password not accepted") {
return nil, models.ErrUserNotExist{Name: login}
}
if (ok && tperr.Code == 534) ||
strings.Contains(err.Error(), "Application-specific password required") {
return nil, models.ErrUserNotExist{Name: login}
}
return nil, err
}
if user != nil {
return user, nil
}
username := login
idx := strings.Index(login, "@")
if idx > -1 {
username = login[:idx]
}
user = &models.User{
LowerName: strings.ToLower(username),
Name: strings.ToLower(username),
Email: login,
Passwd: password,
LoginType: models.LoginSMTP,
LoginSource: source.loginSource.ID,
LoginName: login,
IsActive: true,
}
return user, models.CreateUser(user)
}