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# Smartcard authentication **(PREMIUM ONLY)**
GitLab supports authentication using smartcards.
## Authentication methods
GitLab supports two authentication methods:
- X.509 certificates with local databases.
- LDAP servers.
### Authentication against a local database with X.509 certificates
> [Introduced](https://gitlab.com/gitlab-org/gitlab-ee/issues/726) in
[GitLab Premium](https://about.gitlab.com/pricing/) 11.6 as an experimental
feature. Smartcard authentication against local databases may change or be
removed completely in future releases.
Smartcards with X.509 certificates can be used to authenticate with GitLab.
To use a smartcard with an X.509 certificate to authenticate against a local
database with GitLab, `CN` and `emailAddress` must be defined in the
certificate. For example:
```
Certificate:
Data:
Version: 1 (0x0)
Serial Number: 12856475246677808609 (0xb26b601ecdd555e1)
Signature Algorithm: sha256WithRSAEncryption
Issuer: O=Random Corp Ltd, CN=Random Corp
Validity
Not Before: Oct 30 12:00:00 2018 GMT
Not After : Oct 30 12:00:00 2019 GMT
Subject: CN=Gitlab User, emailAddress=gitlab-user@example.com
```
### Authentication against an LDAP server
> [Introduced](https://gitlab.com/gitlab-org/gitlab-ee/issues/7693) in
[GitLab Premium](https://about.gitlab.com/pricing/) 11.8 as an experimental
feature. Smartcard authentication against an LDAP server may change or be
removed completely in future releases.
GitLab implements a standard way of certificate matching following
[RFC4523](https://tools.ietf.org/html/rfc4523). It uses the
`certificateExactMatch` certificate matching rule against the `userCertificate`
attribute. As a prerequisite, you must use an LDAP server that:
- Supports the `certificateExactMatch` matching rule.
- Has the certificate stored in the `userCertificate` attribute.
## Configure GitLab for smartcard authentication
**For Omnibus installations**
1. Edit `/etc/gitlab/gitlab.rb`:
```ruby
gitlab_rails['smartcard_enabled'] = true
gitlab_rails['smartcard_ca_file'] = "/etc/ssl/certs/CA.pem"
gitlab_rails['smartcard_client_certificate_required_port'] = 3444
```
1. Save the file and [reconfigure](../restart_gitlab.md#omnibus-gitlab-reconfigure)
GitLab for the changes to take effect.
---
**For installations from source**
1. Configure NGINX to request a client side certificate
In NGINX configuration, an **additional** server context must be defined with
the same configuration except:
- The additional NGINX server context must be configured to run on a different
port:
```
listen *:3444 ssl;
```
- The additional NGINX server context must be configured to require the client
side certificate:
```
ssl_verify_depth 2;
ssl_client_certificate /etc/ssl/certs/CA.pem;
ssl_verify_client on;
```
- The additional NGINX server context must be configured to forward the client
side certificate:
```
proxy_set_header X-SSL-Client-Certificate $ssl_client_escaped_cert;
```
For example, the following is an example server context in an NGINX
configuration file (eg. in `/etc/nginx/sites-available/gitlab-ssl`):
```
server {
listen *:3444 ssl;
# certificate for configuring SSL
ssl_certificate /path/to/example.com.crt;
ssl_certificate_key /path/to/example.com.key;
ssl_verify_depth 2;
# CA certificate for client side certificate verification
ssl_client_certificate /etc/ssl/certs/CA.pem;
ssl_verify_client on;
location / {
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $connection_upgrade;
proxy_set_header X-SSL-Client-Certificate $ssl_client_escaped_cert;
proxy_read_timeout 300;
proxy_pass http://gitlab-workhorse;
}
}
```
1. Edit `config/gitlab.yml`:
```yaml
## Smartcard authentication settings
smartcard:
# Allow smartcard authentication
enabled: true
# Path to a file containing a CA certificate
ca_file: '/etc/ssl/certs/CA.pem'
# Port where the client side certificate is requested by NGINX
client_certificate_required_port: 3444
```
1. Save the file and [restart](../restart_gitlab.md#installations-from-source)
GitLab for the changes to take effect.
### Additional steps when authenticating against an LDAP server
**For Omnibus installations**
1. Edit `/etc/gitlab/gitlab.rb`:
```ruby
gitlab_rails['ldap_servers'] = YAML.load <<-EOS
main:
# snip...
# Enable smartcard authentication against the LDAP server. Valid values
# are "false", "optional", and "required".
smartcard_auth: optional
EOS
```
1. Save the file and [reconfigure](../restart_gitlab.md#omnibus-gitlab-reconfigure)
GitLab for the changes to take effect.
**For installations from source**
1. Edit `config/gitlab.yml`:
```yaml
production:
ldap:
servers:
main:
# snip...
# Enable smartcard authentication against the LDAP server. Valid values
# are "false", "optional", and "required".
smartcard_auth: optional
```
1. Save the file and [restart](../restart_gitlab.md#installations-from-source)
GitLab for the changes to take effect.
|
