Gerrit SAML Plugin

This plugin allows you to authenticate to Gerrit using a SAML identity provider.

Installation

Gerrit looks for 3 attributes (which are configurable) in the AttributeStatement:

  • DisplayName: the full name of the user.
  • EmailAddress: email address of the user.
  • UserName: username (used for ssh).

If any of these attributes is not found in the assertion, their value is taken from the NameId field of the SAML assertion.

Setting Gerrit in your IdP (Okta, Onelogin, ...)

  • Create a new SAML 2.0 application.
  • Set the following parameters:
    • Single sign on URL: http://gerrit.site.com/plugins/gerrit-saml-plugin/saml
    • Check “Use this for Recipient URL and Destination URL”.
    • Audience URI (SP Entity Id): http://gerrit.site.com/plugins/gerrit-saml-plugin/saml
    • We need to set up the attributes in the assertion to send the right information. Here is how to do it with Okta:
      • Application username: “Okta username prefix”
      • Add attribute statement: Name: “DisplayName” with Value “user.displayName”
      • Add attribute statement: Name: “EmailAddress” with Value “user.email”
      • IMPORTANT: If you are not using Okta, you need to set up an attribute “UserName” with the value of the username (not email, without @). If you do not do so, the name will be taken from the NameId provided by the assertion. This is why in Okta we set the application username to “Okta username prefix”.
  • Obtain your IdP metadata (either URL or a local XML file)

Download the plugin

Download gerrit-saml-plugin and put it in $gerrit_site/lib/.

Configure Gerrit to use the SAML filter:

In $site_path/etc/gerrit.config file, the [httpd] section should contain

[httpd]
    filterClass = com.thesamet.gerrit.plugins.saml.SamlWebFilter

Configure HTTP authentication for Gerrit:

In $site_path/etc/gerrit.config file, the [auth] section should include the following lines:

[auth]
	type = HTTP
    logoutUrl = https://mysso.example.com/logout
    httpHeader = X-SAML-UserName
    httpDisplaynameHeader = X-SAML-DisplayName
    httpEmailHeader = X-SAML-EmailHeader
    httpExternalIdHeader = X-SAML-ExternalId

The header names are used internally between the SAML plugin and Gerrit to communicate the user's identity. You can use other names (as long as it will not conflict with any other HTTP header Gerrit might expect).

Create a local keystore

In $gerrit_site/etc create a local keystore:

keytool -genkeypair -alias pac4j -keypass pac4j-demo-password \
  -keystore samlKeystore.jks \
  -storepass pac4j-demo-password -keyalg RSA -keysize 2048 -validity 3650

Configure SAML

Add a new [saml] section to $site_path/etc/gerrit.config:

[saml]
    keystorePath = /path/to/samlKeystore.jks
    keystorePassword = pac4j-demo-passwd
    privateKeyPassword = pac4j-demo-passwd
    metadataPath = https://mycompany.okta.com/app/hashash/sso/saml/metadata

saml.metadataPath: Location of IdP Metadata from your SAML identity provider. The value can be a URL, or a local file (prefix with file://)

saml.keystorePath: Path to the keystore created above. If not absolute, the path is resolved relative to $site_path.

saml.privateKeyPassword: Password protecting the private key of the generated key pair (needs to be the same as the password provided throguh the keypass flag above.)

saml.keystorePassword: Password that is used to protect the integrity of the keystore (needs to be the same as the password provided throguh the keystore flag above.)

saml.displayNameAttr: Gerrit will look for an attribute with this name in the assertion to find a display name for the user. If the attribute is not found, the NameId from the SAML assertion is used instead.

Default is DisplayName

saml.emailAddressAttr: Gerrit will look for an attribute with this name in the assertion to find a the email address of the user. If the attribute is not found, the NameId from the SAML assertion is used instead.

Default is EmailAddress

saml.userNameAttr: Gerrit will look for an attribute with this name in the assertion to find a the email address of the user. If the attribute is not found, the NameId from the SAML assertion is used instead.

Default is UserName

Development

  • Clone this repository.
  • Install sbt.
  • Edit the code.
  • Run ‘sbt assembly’ to build the jar.
  • Copy target/out/gerrit-saml-plugin-$VERSION.jar into $site_path/lib/