851 lines
30 KiB
Markdown
851 lines
30 KiB
Markdown
---
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type: reference
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stage: Manage
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group: Access
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info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
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---
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# General LDAP Setup
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GitLab integrates with LDAP to support user authentication.
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This integration works with most LDAP-compliant directory servers, including:
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- Microsoft Active Directory
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- [Microsoft Active Directory Trusts](https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc771568(v=ws.10)) are not supported.
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- Apple Open Directory
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- Open LDAP
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- 389 Server
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Users added through LDAP take a [licensed seat](../../../subscriptions/self_managed/index.md#billable-users).
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GitLab Enterprise Editions (EE) include enhanced integration,
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including group membership syncing as well as multiple LDAP servers support.
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## Overview
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[LDAP](https://en.wikipedia.org/wiki/Lightweight_Directory_Access_Protocol)
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stands for **Lightweight Directory Access Protocol**, which is a standard
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application protocol for accessing and maintaining distributed directory
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information services over an Internet Protocol (IP) network.
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## Security **(FREE SELF)**
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GitLab assumes that LDAP users:
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- Are not able to change their LDAP `mail`, `email`, or `userPrincipalName` attributes.
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An LDAP user who is allowed to change their email on the LDAP server can potentially
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[take over any account](#enabling-ldap-sign-in-for-existing-gitlab-users)
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on your GitLab server.
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- Have unique email addresses, otherwise it is possible for LDAP users with the same
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email address to share the same GitLab account.
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We recommend against using LDAP integration if your LDAP users are
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allowed to change their 'mail', 'email' or 'userPrincipalName' attribute on
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the LDAP server or share email addresses.
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### User deletion **(FREE SELF)**
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If a user is deleted from the LDAP server, they are also blocked in GitLab.
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Users are immediately blocked from logging in. However, there is an
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LDAP check cache time of one hour (see note) which means users that
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are already logged in or are using Git over SSH are be able to access
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GitLab for up to one hour. Manually block the user in the GitLab Admin Area to
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immediately block all access.
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GitLab Enterprise Edition Premium supports a
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[configurable sync time](#adjusting-ldap-user-sync-schedule). **(PREMIUM)**
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## Git password authentication **(FREE SELF)**
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LDAP-enabled users can always authenticate with Git using their GitLab username
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or email and LDAP password, even if password authentication for Git is disabled
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in the application settings.
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## Enabling LDAP sign-in for existing GitLab users **(FREE SELF)**
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When a user signs in to GitLab with LDAP for the first time, and their LDAP
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email address is the primary email address of an existing GitLab user, then
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the LDAP DN is associated with the existing user. If the LDAP email
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attribute is not found in the GitLab user database, a new user is created.
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In other words, if an existing GitLab user wants to enable LDAP sign-in for
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themselves, they should check that their GitLab email address matches their
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LDAP email address, and then sign into GitLab via their LDAP credentials.
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## Google Secure LDAP **(FREE SELF)**
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> Introduced in GitLab 11.9.
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[Google Cloud Identity](https://cloud.google.com/identity/) provides a Secure
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LDAP service that can be configured with GitLab for authentication and group sync.
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See [Google Secure LDAP](google_secure_ldap.md) for detailed configuration instructions.
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## Configuration **(FREE SELF)**
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To enable LDAP integration you need to add your LDAP server settings in
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`/etc/gitlab/gitlab.rb` or `/home/git/gitlab/config/gitlab.yml` for Omnibus
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GitLab and installations from source respectively.
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There is a Rake task to check LDAP configuration. After configuring LDAP
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using the documentation below, see [LDAP check Rake task](../../raketasks/check.md#ldap-check)
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for information on the LDAP check Rake task.
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NOTE:
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The `encryption` value `simple_tls` corresponds to 'Simple TLS' in the LDAP
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library. `start_tls` corresponds to StartTLS, not to be confused with regular TLS.
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Normally, if you specify `simple_tls` it is on port 636, while `start_tls` (StartTLS)
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would be on port 389. `plain` also operates on port 389. Removed values: `tls` was replaced with `start_tls` and `ssl` was replaced with `simple_tls`.
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LDAP users must have a set email address, regardless of whether or not it's used
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to sign in.
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### Example Configurations **(FREE SELF)**
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**Omnibus Configuration**
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```ruby
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gitlab_rails['ldap_enabled'] = true
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gitlab_rails['prevent_ldap_sign_in'] = false
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gitlab_rails['ldap_servers'] = {
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'main' => {
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'label' => 'LDAP',
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'host' => 'ldap.mydomain.com',
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'port' => 389,
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'uid' => 'sAMAccountName',
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'encryption' => 'simple_tls',
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'verify_certificates' => true,
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'bind_dn' => '_the_full_dn_of_the_user_you_will_bind_with',
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'password' => '_the_password_of_the_bind_user',
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'verify_certificates' => true,
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'tls_options' => {
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'ca_file' => '',
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'ssl_version' => '',
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'ciphers' => '',
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'cert' => '',
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'key' => ''
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},
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'timeout' => 10,
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'active_directory' => true,
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'allow_username_or_email_login' => false,
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'block_auto_created_users' => false,
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'base' => 'dc=example,dc=com',
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'user_filter' => '',
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'attributes' => {
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'username' => ['uid', 'userid', 'sAMAccountName'],
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'email' => ['mail', 'email', 'userPrincipalName'],
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'name' => 'cn',
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'first_name' => 'givenName',
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'last_name' => 'sn'
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},
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'lowercase_usernames' => false,
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# EE Only
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'group_base' => '',
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'admin_group' => '',
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'external_groups' => [],
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'sync_ssh_keys' => false
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}
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}
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```
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**Source Configuration**
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```yaml
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production:
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# snip...
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ldap:
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enabled: false
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prevent_ldap_sign_in: false
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servers:
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main:
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label: 'LDAP'
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...
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```
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### Basic Configuration Settings **(FREE SELF)**
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| Setting | Description | Required | Examples |
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| ------- | ----------- | -------- | -------- |
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| `label` | A human-friendly name for your LDAP server. It is displayed on your sign-in page. | yes | `'Paris'` or `'Acme, Ltd.'` |
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| `host` | IP address or domain name of your LDAP server. | yes | `'ldap.mydomain.com'` |
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| `port` | The port to connect with on your LDAP server. Always an integer, not a string. | yes | `389` or `636` (for SSL) |
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| `uid` | LDAP attribute for username. Should be the attribute, not the value that maps to the `uid`. | yes | `'sAMAccountName'` or `'uid'` or `'userPrincipalName'` |
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| `bind_dn` | The full DN of the user you bind with. | no | `'america\momo'` or `'CN=Gitlab,OU=Users,DC=domain,DC=com'` |
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| `password` | The password of the bind user. | no | `'your_great_password'` |
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| `encryption` | Encryption method. The `method` key is deprecated in favor of `encryption`. | yes | `'start_tls'` or `'simple_tls'` or `'plain'` |
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| `verify_certificates` | Enables SSL certificate verification if encryption method is `start_tls` or `simple_tls`. Defaults to true. | no | boolean |
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| `timeout` | Set a timeout, in seconds, for LDAP queries. This helps avoid blocking a request if the LDAP server becomes unresponsive. A value of `0` means there is no timeout. (default: `10`) | no | `10` or `30` |
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| `active_directory` | This setting specifies if LDAP server is Active Directory LDAP server. For non-AD servers it skips the AD specific queries. If your LDAP server is not AD, set this to false. | no | boolean |
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| `allow_username_or_email_login` | If enabled, GitLab ignores everything after the first `@` in the LDAP username submitted by the user on sign-in. If you are using `uid: 'userPrincipalName'` on ActiveDirectory you need to disable this setting, because the userPrincipalName contains an `@`. | no | boolean |
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| `block_auto_created_users` | To maintain tight control over the number of billable users on your GitLab installation, enable this setting to keep new users blocked until they have been cleared by an administrator (default: false). | no | boolean |
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| `base` | Base where we can search for users. | yes | `'ou=people,dc=gitlab,dc=example'` or `'DC=mydomain,DC=com'` |
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| `user_filter` | Filter LDAP users. Format: [RFC 4515](https://tools.ietf.org/search/rfc4515) Note: GitLab does not support `omniauth-ldap`'s custom filter syntax. | no | `'(employeeType=developer)'` or `'(&(objectclass=user)(|(samaccountname=momo)(samaccountname=toto)))'` |
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| `lowercase_usernames` | If lowercase_usernames is enabled, GitLab converts the name to lower case. | no | boolean |
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### SSL Configuration Settings **(FREE SELF)**
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| Setting | Description | Required | Examples |
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| ------- | ----------- | -------- | -------- |
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| `ca_file` | Specifies the path to a file containing a PEM-format CA certificate, for example, if you need to use an internal CA. | no | `'/etc/ca.pem'` |
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| `ssl_version` | Specifies the SSL version for OpenSSL to use, if the OpenSSL default is not appropriate. | no | `'TLSv1_1'` |
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| `ciphers` | Specific SSL ciphers to use in communication with LDAP servers. | no | `'ALL:!EXPORT:!LOW:!aNULL:!eNULL:!SSLv2'` |
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| `cert` | Client certificate | no | `'-----BEGIN CERTIFICATE----- <REDACTED> -----END CERTIFICATE -----'` |
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| `key` | Client private key | no | `'-----BEGIN PRIVATE KEY----- <REDACTED> -----END PRIVATE KEY -----'` |
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### Attribute Configuration Settings **(FREE SELF)**
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LDAP attributes that GitLab uses to create an account for the LDAP user. The specified attribute can either be the attribute name as a string (for example, `'mail'`), or an array of attribute names to try in order (for example, `['mail', 'email']`). Note that the user's LDAP sign-in is the attribute specified as `uid` above.
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| Setting | Description | Required | Examples |
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| ------- | ----------- | -------- | -------- |
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| `username` | The username is used in paths for the user's own projects (like `gitlab.example.com/username/project`) and when mentioning them in issues, merge request and comments (like `@username`). If the attribute specified for `username` contains an email address, the GitLab username is part of the email address before the `@`. | no | `['uid', 'userid', 'sAMAccountName']` |
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| `email` | LDAP attribute for user email. | no | `['mail', 'email', 'userPrincipalName']` |
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| `name` | LDAP attribute for user display name. If `name` is blank, the full name is taken from the `first_name` and `last_name`. | no | Attributes `'cn'`, or `'displayName'` commonly carry full names. Alternatively, you can force the use of `first_name` and `last_name` by specifying an absent attribute such as `'somethingNonExistent'`. |
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| `first_name` | LDAP attribute for user first name. Used when the attribute configured for `name` does not exist. | no | `'givenName'` |
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| `last_name` | LDAP attribute for user last name. Used when the attribute configured for `name` does not exist. | no | `'sn'` |
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### LDAP Sync Configuration Settings **(PREMIUM SELF)**
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| Setting | Description | Required | Examples |
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| ------- | ----------- | -------- | -------- |
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| `group_base` | Base used to search for groups. | no | `'ou=groups,dc=gitlab,dc=example'` |
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| `admin_group` | The CN of a group containing GitLab administrators. Note: Not `cn=administrators` or the full DN. | no | `'administrators'` |
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| `external_groups` | An array of CNs of groups containing users that should be considered external. Note: Not `cn=interns` or the full DN. | no | `['interns', 'contractors']` |
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| `sync_ssh_keys` | The LDAP attribute containing a user's public SSH key. | no | `'sshPublicKey'` or false if not set |
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### Set up LDAP user filter **(FREE SELF)**
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If you want to limit all GitLab access to a subset of the LDAP users on your
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LDAP server, the first step should be to narrow the configured `base`. However,
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it is sometimes necessary to filter users further. In this case, you can set up
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an LDAP user filter. The filter must comply with
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[RFC 4515](https://tools.ietf.org/search/rfc4515).
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**Omnibus configuration**
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```ruby
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gitlab_rails['ldap_servers'] = {
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'main' => {
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# snip...
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'user_filter' => '(employeeType=developer)'
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}
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}
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```
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**Source configuration**
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```yaml
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production:
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ldap:
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servers:
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main:
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# snip...
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user_filter: '(employeeType=developer)'
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```
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If you want to limit access to the nested members of an Active Directory
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group, you can use the following syntax:
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```plaintext
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(memberOf:1.2.840.113556.1.4.1941:=CN=My Group,DC=Example,DC=com)
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```
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For more information about this "LDAP_MATCHING_RULE_IN_CHAIN" filter, see the following
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[Microsoft Search Filter Syntax](https://docs.microsoft.com/en-us/windows/win32/adsi/search-filter-syntax) document.
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Support for nested members in the user filter should not be confused with
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[group sync nested groups support](#supported-ldap-group-typesattributes). **(PREMIUM SELF)**
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Please note that GitLab does not support the custom filter syntax used by
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OmniAuth LDAP.
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#### Escaping special characters **(FREE SELF)**
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The `user_filter` DN can contain special characters. For example:
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- A comma:
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```plaintext
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OU=GitLab, Inc,DC=gitlab,DC=com
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```
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- Open and close brackets:
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```plaintext
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OU=Gitlab (Inc),DC=gitlab,DC=com
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```
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These characters must be escaped as documented in
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[RFC 4515](https://tools.ietf.org/search/rfc4515).
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- Escape commas with `\2C`. For example:
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```plaintext
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OU=GitLab\2C Inc,DC=gitlab,DC=com
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```
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- Escape open and close brackets with `\28` and `\29`, respectively. For example:
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```plaintext
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OU=Gitlab \28Inc\29,DC=gitlab,DC=com
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```
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### Enabling LDAP username lowercase **(FREE SELF)**
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Some LDAP servers, depending on their configurations, can return uppercase usernames.
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This can lead to several confusing issues such as creating links or namespaces with uppercase names.
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GitLab can automatically lowercase usernames provided by the LDAP server by enabling
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the configuration option `lowercase_usernames`. By default, this configuration option is `false`.
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**Omnibus configuration**
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1. Edit `/etc/gitlab/gitlab.rb`:
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```ruby
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gitlab_rails['ldap_servers'] = {
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'main' => {
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# snip...
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'lowercase_usernames' => true
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}
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}
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```
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1. [Reconfigure GitLab](../../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
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**Source configuration**
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1. Edit `config/gitlab.yaml`:
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```yaml
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production:
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ldap:
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servers:
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main:
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# snip...
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lowercase_usernames: true
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```
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1. [Restart GitLab](../../restart_gitlab.md#installations-from-source) for the changes to take effect.
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### Disable LDAP web sign in **(FREE SELF)**
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It can be useful to prevent using LDAP credentials through the web UI when
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an alternative such as SAML is preferred. This allows LDAP to be used for group
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sync, while also allowing your SAML identity provider to handle additional
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checks like custom 2FA.
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When LDAP web sign in is disabled, users don't see an **LDAP** tab on the sign in page.
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This does not disable [using LDAP credentials for Git access](#git-password-authentication).
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**Omnibus configuration**
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1. Edit `/etc/gitlab/gitlab.rb`:
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```ruby
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gitlab_rails['prevent_ldap_sign_in'] = true
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```
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1. [Reconfigure GitLab](../../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
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**Source configuration**
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1. Edit `config/gitlab.yaml`:
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```yaml
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production:
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ldap:
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prevent_ldap_sign_in: true
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```
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1. [Restart GitLab](../../restart_gitlab.md#installations-from-source) for the changes to take effect.
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### Using encrypted credentials **(FREE SELF)**
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Instead of having the LDAP integration credentials stored in plaintext in the configuration files, you can optionally
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use an encrypted file for the LDAP credentials. To use this feature, you first need to enable
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[GitLab encrypted configuration](../../encrypted_configuration.md).
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The encrypted configuration for LDAP exists in an encrypted YAML file. By default the file will be created at
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`shared/encrypted_configuration/ldap.yaml.enc`. This location is configurable in the GitLab configuration.
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The unencrypted contents of the file should be a subset of the secret settings from your `servers` block in the LDAP
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configuration.
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The supported configuration items for the encrypted file are:
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- `bind_dn`
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- `password`
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The encrypted contents can be configured with the [LDAP secret edit Rake command](../../raketasks/ldap.md#edit-secret).
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**Omnibus configuration**
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If initially your LDAP configuration looked like:
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1. In `/etc/gitlab/gitlab.rb`:
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```ruby
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gitlab_rails['ldap_servers'] = {
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'main' => {
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# snip...
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'bind_dn' => 'admin',
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'password' => '123'
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}
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}
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```
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1. Edit the encrypted secret:
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```shell
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sudo gitlab-rake gitlab:ldap:secret:edit EDITOR=vim
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```
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1. The unencrypted contents of the LDAP secret should be entered like:
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```yaml
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main:
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bind_dn: admin
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password: '123'
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```
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1. Edit `/etc/gitlab/gitlab.rb` and remove the settings for `user_bn` and `password`.
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1. [Reconfigure GitLab](../../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
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**Source configuration**
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If initially your LDAP configuration looked like:
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1. In `config/gitlab.yaml`:
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```yaml
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production:
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ldap:
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servers:
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main:
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# snip...
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bind_dn: admin
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password: '123'
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```
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1. Edit the encrypted secret:
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```shell
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bundle exec rake gitlab:ldap:secret:edit EDITOR=vim RAILS_ENVIRONMENT=production
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```
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1. The unencrypted contents of the LDAP secret should be entered like:
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```yaml
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main:
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bind_dn: admin
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password: '123'
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```
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1. Edit `config/gitlab.yaml` and remove the settings for `user_bn` and `password`.
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1. [Restart GitLab](../../restart_gitlab.md#installations-from-source) for the changes to take effect.
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## Encryption **(FREE SELF)**
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### TLS Server Authentication
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There are two encryption methods, `simple_tls` and `start_tls`.
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For either encryption method, if setting `verify_certificates: false`, TLS
|
|
encryption is established with the LDAP server before any LDAP-protocol data is
|
|
exchanged but no validation of the LDAP server's SSL certificate is performed.
|
|
|
|
### Limitations
|
|
|
|
#### TLS Client Authentication
|
|
|
|
Not implemented by `Net::LDAP`.
|
|
|
|
You should disable anonymous LDAP authentication and enable simple or SASL
|
|
authentication. The TLS client authentication setting in your LDAP server cannot
|
|
be mandatory and clients cannot be authenticated with the TLS protocol.
|
|
|
|
## Multiple LDAP servers **(PREMIUM SELF)**
|
|
|
|
With GitLab Enterprise Edition Starter, you can configure multiple LDAP servers
|
|
that your GitLab instance connects to.
|
|
|
|
To add another LDAP server:
|
|
|
|
1. Duplicate the settings under [the main configuration](#configuration).
|
|
1. Edit them to match the additional LDAP server.
|
|
|
|
Be sure to choose a different provider ID made of letters a-z and numbers 0-9.
|
|
This ID is stored in the database so that GitLab can remember which LDAP
|
|
server a user belongs to.
|
|
|
|
|
|
|
|
Based on the example illustrated on the image above,
|
|
our `gitlab.rb` configuration would look like:
|
|
|
|
```ruby
|
|
gitlab_rails['ldap_enabled'] = true
|
|
gitlab_rails['ldap_servers'] = {
|
|
'main' => {
|
|
'label' => 'GitLab AD',
|
|
'host' => 'ad.example.org',
|
|
'port' => 636,
|
|
...
|
|
},
|
|
|
|
'secondary' => {
|
|
'label' => 'GitLab Secondary AD',
|
|
'host' => 'ad-secondary.example.net',
|
|
'port' => 636,
|
|
...
|
|
},
|
|
|
|
'tertiary' => {
|
|
'label' => 'GitLab Tertiary AD',
|
|
'host' => 'ad-tertiary.example.net',
|
|
'port' => 636,
|
|
...
|
|
}
|
|
|
|
}
|
|
```
|
|
|
|
If you configure multiple LDAP servers, use a unique naming convention for the `label` section of each entry. That label is used as the display name of the tab shown on the sign-in page.
|
|
|
|
## User sync **(PREMIUM SELF)**
|
|
|
|
Once per day, GitLab runs a worker to check and update GitLab
|
|
users against LDAP.
|
|
|
|
The process executes the following access checks:
|
|
|
|
- Ensure the user is still present in LDAP.
|
|
- If the LDAP server is Active Directory, ensure the user is active (not
|
|
blocked/disabled state). This is checked only if
|
|
`active_directory: true` is set in the LDAP configuration.
|
|
|
|
In Active Directory, a user is marked as disabled/blocked if the user
|
|
account control attribute (`userAccountControl:1.2.840.113556.1.4.803`)
|
|
has bit 2 set.
|
|
|
|
<!-- vale gitlab.Spelling = NO -->
|
|
|
|
For more information, see [Bitmask Searches in LDAP](https://ctovswild.com/2009/09/03/bitmask-searches-in-ldap/).
|
|
|
|
<!-- vale gitlab.Spelling = YES -->
|
|
|
|
The user is set to an `ldap_blocked` state in GitLab if the previous conditions
|
|
fail. This means the user is not able to sign in or push/pull code.
|
|
|
|
The process also updates the following user information:
|
|
|
|
- Email address.
|
|
- If `sync_ssh_keys` is set, SSH public keys.
|
|
- If Kerberos is enabled, Kerberos identity.
|
|
|
|
The LDAP sync process:
|
|
|
|
- Updates existing users.
|
|
- Creates new users on first sign in.
|
|
|
|
### Adjusting LDAP user sync schedule **(PREMIUM SELF)**
|
|
|
|
By default, GitLab runs a worker once per day at 01:30 a.m. server time to
|
|
check and update GitLab users against LDAP.
|
|
|
|
You can manually configure LDAP user sync times by setting the
|
|
following configuration values, in cron format. If needed, you can
|
|
use a [crontab generator](http://www.crontabgenerator.com).
|
|
The example below shows how to set LDAP user
|
|
sync to run once every 12 hours at the top of the hour.
|
|
|
|
**Omnibus installations**
|
|
|
|
1. Edit `/etc/gitlab/gitlab.rb`:
|
|
|
|
```ruby
|
|
gitlab_rails['ldap_sync_worker_cron'] = "0 */12 * * *"
|
|
```
|
|
|
|
1. [Reconfigure GitLab](../../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
|
|
|
|
**Source installations**
|
|
|
|
1. Edit `config/gitlab.yaml`:
|
|
|
|
```yaml
|
|
cron_jobs:
|
|
ldap_sync_worker_cron:
|
|
"0 */12 * * *"
|
|
```
|
|
|
|
1. [Restart GitLab](../../restart_gitlab.md#installations-from-source) for the changes to take effect.
|
|
|
|
## Group Sync **(PREMIUM SELF)**
|
|
|
|
If your LDAP supports the `memberof` property, when the user signs in for the
|
|
first time GitLab triggers a sync for groups the user should be a member of.
|
|
That way they don't need to wait for the hourly sync to be granted
|
|
access to their groups and projects.
|
|
|
|
A group sync process runs every hour on the hour, and `group_base` must be set
|
|
in LDAP configuration for LDAP synchronizations based on group CN to work. This allows
|
|
GitLab group membership to be automatically updated based on LDAP group members.
|
|
|
|
The `group_base` configuration should be a base LDAP 'container', such as an
|
|
'organization' or 'organizational unit', that contains LDAP groups that should
|
|
be available to GitLab. For example, `group_base` could be
|
|
`ou=groups,dc=example,dc=com`. In the configuration file it looks like the
|
|
following.
|
|
|
|
**Omnibus configuration**
|
|
|
|
1. Edit `/etc/gitlab/gitlab.rb`:
|
|
|
|
```ruby
|
|
gitlab_rails['ldap_servers'] = {
|
|
'main' => {
|
|
# snip...
|
|
'group_base' => 'ou=groups,dc=example,dc=com',
|
|
}
|
|
}
|
|
```
|
|
|
|
1. [Apply your changes to GitLab](../../restart_gitlab.md#omnibus-gitlab-reconfigure).
|
|
|
|
**Source configuration**
|
|
|
|
1. Edit `/home/git/gitlab/config/gitlab.yml`:
|
|
|
|
```yaml
|
|
production:
|
|
ldap:
|
|
servers:
|
|
main:
|
|
# snip...
|
|
group_base: ou=groups,dc=example,dc=com
|
|
```
|
|
|
|
1. [Restart GitLab](../../restart_gitlab.md#installations-from-source) for the changes to take effect.
|
|
|
|
To take advantage of group sync, group owners or maintainers need to [create one
|
|
or more LDAP group links](#adding-group-links).
|
|
|
|
### Adding group links **(PREMIUM SELF)**
|
|
|
|
For information on adding group links via CNs and filters, refer to [the GitLab groups documentation](../../../user/group/index.md#manage-group-memberships-via-ldap).
|
|
|
|
### Administrator sync **(PREMIUM SELF)**
|
|
|
|
As an extension of group sync, you can automatically manage your global GitLab
|
|
administrators. Specify a group CN for `admin_group` and all members of the
|
|
LDAP group will be given administrator privileges. The configuration looks
|
|
like the following.
|
|
|
|
NOTE:
|
|
Administrators are not synced unless `group_base` is also
|
|
specified alongside `admin_group`. Also, only specify the CN of the `admin_group`,
|
|
as opposed to the full DN.
|
|
|
|
**Omnibus configuration**
|
|
|
|
1. Edit `/etc/gitlab/gitlab.rb`:
|
|
|
|
```ruby
|
|
gitlab_rails['ldap_servers'] = {
|
|
'main' => {
|
|
# snip...
|
|
'group_base' => 'ou=groups,dc=example,dc=com',
|
|
'admin_group' => 'my_admin_group',
|
|
}
|
|
}
|
|
```
|
|
|
|
1. [Apply your changes to GitLab](../../restart_gitlab.md#omnibus-gitlab-reconfigure).
|
|
|
|
**Source configuration**
|
|
|
|
1. Edit `/home/git/gitlab/config/gitlab.yml`:
|
|
|
|
```yaml
|
|
production:
|
|
ldap:
|
|
servers:
|
|
main:
|
|
# snip...
|
|
group_base: ou=groups,dc=example,dc=com
|
|
admin_group: my_admin_group
|
|
```
|
|
|
|
1. [Restart GitLab](../../restart_gitlab.md#installations-from-source) for the changes to take effect.
|
|
|
|
### Global group memberships lock **(PREMIUM SELF)**
|
|
|
|
> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/1793) in GitLab 12.0.
|
|
|
|
"Lock memberships to LDAP synchronization" setting allows instance administrators
|
|
to lock down user abilities to invite new members to a group.
|
|
|
|
When enabled, the following applies:
|
|
|
|
- Only administrator can manage memberships of any group including access levels.
|
|
- Users are not allowed to share project with other groups or invite members to
|
|
a project created in a group.
|
|
|
|
To enable it you need to:
|
|
|
|
1. [Enable LDAP](#configuration)
|
|
1. Navigate to **Admin Area > Settings -> Visibility and access controls**.
|
|
1. Make sure the "Lock memberships to LDAP synchronization" checkbox is enabled.
|
|
|
|
### Adjusting LDAP group sync schedule **(PREMIUM SELF)**
|
|
|
|
By default, GitLab runs a group sync process every hour, on the hour.
|
|
The values shown are in cron format. If needed, you can use a
|
|
[Crontab Generator](http://www.crontabgenerator.com).
|
|
|
|
WARNING:
|
|
Do not start the sync process too frequently as this
|
|
could lead to multiple syncs running concurrently. This is primarily a concern
|
|
for installations with a large number of LDAP users. Please review the
|
|
[LDAP group sync benchmark metrics](#benchmarks) to see how
|
|
your installation compares before proceeding.
|
|
|
|
You can manually configure LDAP group sync times by setting the
|
|
following configuration values. The example below shows how to set group
|
|
sync to run once every 2 hours at the top of the hour.
|
|
|
|
**Omnibus installations**
|
|
|
|
1. Edit `/etc/gitlab/gitlab.rb`:
|
|
|
|
```ruby
|
|
gitlab_rails['ldap_group_sync_worker_cron'] = "0 */2 * * * *"
|
|
```
|
|
|
|
1. [Reconfigure GitLab](../../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
|
|
|
|
**Source installations**
|
|
|
|
1. Edit `config/gitlab.yaml`:
|
|
|
|
```yaml
|
|
cron_jobs:
|
|
ldap_group_sync_worker_cron:
|
|
"*/30 * * * *"
|
|
```
|
|
|
|
1. [Restart GitLab](../../restart_gitlab.md#installations-from-source) for the changes to take effect.
|
|
|
|
### External groups **(PREMIUM SELF)**
|
|
|
|
Using the `external_groups` setting will allow you to mark all users belonging
|
|
to these groups as [external users](../../../user/permissions.md#external-users).
|
|
Group membership is checked periodically through the `LdapGroupSync` background
|
|
task.
|
|
|
|
**Omnibus configuration**
|
|
|
|
1. Edit `/etc/gitlab/gitlab.rb`:
|
|
|
|
```ruby
|
|
gitlab_rails['ldap_servers'] = {
|
|
'main' => {
|
|
# snip...
|
|
'external_groups' => ['interns', 'contractors'],
|
|
}
|
|
}
|
|
```
|
|
|
|
1. [Apply your changes to GitLab](../../restart_gitlab.md#omnibus-gitlab-reconfigure).
|
|
|
|
**Source configuration**
|
|
|
|
1. Edit `config/gitlab.yaml`:
|
|
|
|
```yaml
|
|
production:
|
|
ldap:
|
|
servers:
|
|
main:
|
|
# snip...
|
|
external_groups: ['interns', 'contractors']
|
|
```
|
|
|
|
1. [Restart GitLab](../../restart_gitlab.md#installations-from-source) for the changes to take effect.
|
|
|
|
### Group sync technical details
|
|
|
|
There is a lot going on with group sync 'under the hood'. This section
|
|
outlines what LDAP queries are executed and what behavior you can expect
|
|
from group sync.
|
|
|
|
Group member access are downgraded from a higher level if their LDAP group
|
|
membership changes. For example, if a user has 'Owner' rights in a group and the
|
|
next group sync reveals they should only have 'Developer' privileges, their
|
|
access is adjusted accordingly. The only exception is if the user is the
|
|
*last* owner in a group. Groups need at least one owner to fulfill
|
|
administrative duties.
|
|
|
|
#### Supported LDAP group types/attributes
|
|
|
|
GitLab supports LDAP groups that use member attributes:
|
|
|
|
- `member`
|
|
- `submember`
|
|
- `uniquemember`
|
|
- `memberof`
|
|
- `memberuid`.
|
|
|
|
This means group sync supports, at least, LDAP groups with the following object classes:
|
|
`groupOfNames`, `posixGroup`, and `groupOfUniqueNames`.
|
|
|
|
Other object classes should work fine as long as members
|
|
are defined as one of the mentioned attributes. This also means GitLab supports
|
|
Microsoft Active Directory, Apple Open Directory, Open LDAP, and 389 Server.
|
|
Other LDAP servers should work, too.
|
|
|
|
Active Directory also supports nested groups. Group sync recursively
|
|
resolves membership if `active_directory: true` is set in the configuration file.
|
|
|
|
##### Nested group memberships
|
|
|
|
Nested group memberships are resolved only if the nested group
|
|
is found in the configured `group_base`. For example, if GitLab sees a
|
|
nested group with DN `cn=nested_group,ou=special_groups,dc=example,dc=com` but
|
|
the configured `group_base` is `ou=groups,dc=example,dc=com`, `cn=nested_group`
|
|
is ignored.
|
|
|
|
#### Queries
|
|
|
|
- Each LDAP group is queried a maximum of one time with base `group_base` and
|
|
filter `(cn=<cn_from_group_link>)`.
|
|
- If the LDAP group has the `memberuid` attribute, GitLab executes another
|
|
LDAP query per member to obtain each user's full DN. These queries are
|
|
executed with base `base`, scope 'base object', and a filter depending on
|
|
whether `user_filter` is set. Filter may be `(uid=<uid_from_group>)` or a
|
|
joining of `user_filter`.
|
|
|
|
#### Benchmarks
|
|
|
|
Group sync was written to be as performant as possible. Data is cached, database
|
|
queries are optimized, and LDAP queries are minimized. The last benchmark run
|
|
revealed the following metrics:
|
|
|
|
For 20000 LDAP users, 11000 LDAP groups and 1000 GitLab groups with 10
|
|
LDAP group links each:
|
|
|
|
- Initial sync (no existing members assigned in GitLab) took 1.8 hours
|
|
- Subsequent syncs (checking membership, no writes) took 15 minutes
|
|
|
|
These metrics are meant to provide a baseline and performance may vary based on
|
|
any number of factors. This was an extreme benchmark and most instances don't
|
|
have near this many users or groups. Disk speed, database performance,
|
|
network and LDAP server response time affects these metrics.
|
|
|
|
## Troubleshooting
|
|
|
|
Please see our [administrator guide to troubleshooting LDAP](ldap-troubleshooting.md).
|