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SAML

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Authentication via Existing Identity Management Systems

Chef Automate can integrate with existing SAML services to authenticate users in Chef Automate, and thus use their existing group memberships to determine their Chef Automate permissions.

Chef Automate supports using both local users and externally managed users from an external identity provider (IdP). Both one LDAP service (or MSAD for simplified configuration of Active Directory setups) and one SAML IdP can be used. You do not need to configure an external IdP if you simply want to create users and teams local to Chef Automate. See the Users documentation for additional information.

Chef Automate uses Dex to support SAML integrations. To configure authentication for your Chef Automate installation, create a TOML file that contains the partial SAML configuration. Then run chef-automate config patch </path/to/your-file.toml> to deploy your change.

Warning

You may only integrate one IdP using SAML and one IdP using LDAP at a time. Chef Automate does not support using two SAML IdPs or two LDAP services simultaneously.

If you need to change your configured IdP, you will need to replace your existing configuration by following these steps:

  1. Run chef-automate config show config.toml.
  2. Edit config.toml to replace the dex.v1.sys.connectors section with the config values for your new identity provider.
  3. Run chef-automate config set config.toml to set your updated config.

Note

Users who sign in via SAML will have a session time of 24 hours before needing to sign in again.

Supported Identity Management Systems

  • Azure AD
  • Office365
  • OKTA
  • OneLogin
  • Ping
  • Tivoli Federated Identity Manager

Azure AD

Using Azure AD as an SAML IdP requires specific configuration for both Azure AD and Chef Automate.

Note

The signing certificate used for Chef Automate’s SAML integration with Azure AD requires manual management. Signing key rotation is not done automatically.

In Azure AD, add Chef Automate as a “non-gallery application”, and then configure its SAML sign-in method. The Azure AD documentation provides a detailed guide. Enter https://automate.example.com/dex/callback as the value for both Identifier (Entity ID) and Reply URL (Assertion Consumer Service URL).

You may use the default claims provided by Azure AD. Remember to edit the Chef Automate configuration in config.toml to reflect this claims information.

Download the Certificate (Base64) in Azure AD and take note of the Login URL for use in the Chef Automate configuration.

After configuring Azure AD, edit your Chef Automate config.toml configuration file to reflect the values entered in the Azure AD interface. The minimal configuration snippet in config.toml will look similar to:

[dex.v1.sys.connectors.saml]
ca_contents="""
<<Certificate (Base64)>>
"""
sso_url = "<<Login URL>>"
email_attr = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress"
username_attr = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress"
entity_issuer = "https://automate.example.com/dex/callback"

where:

  • ca_contents contains the value of the Certificate (Base64), and includes the -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- markers
  • sso_url contains the value of Login URL
  • entity_issuer contains the value of Identifier (Entity ID)

See the SAML Configuration Settings for further configuration options.

Warning

Azure AD lets you choose the NameID field, and optionally apply transformations to it. The SAML configuration setting is only respected if the selected value in “Choose name identifier format” in Azure AD matches the name_id_policy_format configuration in Chef Automate.

SAML Configuration Settings

The SAML configuration settings are:

[dex.v1.sys.connectors.saml]
ca_contents = "<your ca contents>"          # required
sso_url = "<your SSO URL>"                  # required
email_attr = "<your email attribute>"       # required
username_attr = "<your username attribute>" # required
groups_attr = "<your groups attribute>"     # optional
allowed_groups = ["group1", "group 2"]      # optional
entity_issuer = "<your entity issuer>"      # optional
name_id_policy_format = "<see below>"       # optional

ca_contents must contain a copy of the certificate used to sign the SAML assertions. The certificate should be a PEM-encoded string. For example,

ca_contents = """-----BEGIN CERTIFICATE-----
MIIE+DCCAuCgAwIBAgIBATANBgkqhkiG9w0BAQsFADAcMRowGAYDVQQDExFDaGVm
[...]
s1V9oZ7+NcK8vtcdXhjB5N65LbPlaT3nbvXGIvsQmoGc+FQ5WI4agoNlofOCogdW
k2WFcoiiKyeIznNScx/K6AeykKR/lPrJedanSA==
-----END CERTIFICATE-----
"""

Warning

The groups_attr setting is optional, but if not provided, users authenticating via SAML will not be members of any teams.

Setting allowed_groups provides SAML sign in to members of the listed groups. All of the other user groups that are not in the list are discarded, and not available to Chef Automate. In the configuration example above, only users in either “group1” or “group2” may sign in, and those groups would appear as team:saml:group1 and team:saml:group2 respectively.

Chef Automate supports using SAML to authenticate users and apply permissions to SAML groups. See IAM Overview.

Member expressions are required for externally managed users and teams, as well as API tokens. See IAM_v2_Guide.

[dex.v1.sys.connectors.saml]
  ca_contents = "<your ca contents>"
  sso_url = "<your SAML SSO URL>"

  ###
  # SAML Attributes to map to a user's Chef Automate session
  ###
  # Example: "email"
  email_attr = "<your email attribute>"
  # Example: "name"
  username_attr = "<your username attribute>"
  # Example: "groups"
  groups_attr = "<your groups attribute>"

  # Optional: Manually specify Chef Automate's Issuer value.
  #
  # When provided Chef Automate will include this as the Issuer value in the SAML
  # AuthnRequest. It will also override the redirectURI as the required audience
  # when evaluating AudienceRestriction elements in the response.
  # Example: "https://automate.example.com/dex/callback"
  entity_issuer = "<your entity issuer>"

  # Optional: Specify the NameIDPolicy to use
  #
  # When provided, Chef Automate will request a name ID of the configured format
  # in the SAML AuthnRequest.
  # Defaults to "urn:oasis:names:tc:SAML:2.0:nameid-format:persistent".
  #
  # Note: Even when configured otherwise, the username gathered from the SAML
  # response is _treated_ as persistent. So, if this is set to
  #    "urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress"
  # and a user has changed their email address, they will be a _new_ user to Chef
  # Automate.
  name_id_policy_format = "urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified"

In your SAML Identity Provider (IdP), your Chef Automate instance needs to be referenced as a Service Provider (SP). To do so, use https://automate.example.com/dex/callback. The concrete configuration items differ between IdP products, but it is often something like “Assertion Consumption URI” or “Single sign on URL”. For “Audience URI” or “SP Entity ID”, use the same address.

These values are accepted for name_id_policy_format:

  • urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress
  • urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified
  • urn:oasis:names:tc:SAML:1.1:nameid-format:X509SubjectName
  • urn:oasis:names:tc:SAML:1.1:nameid-format:WindowsDomainQualifiedName
  • urn:oasis:names:tc:SAML:2.0:nameid-format:encrypted
  • urn:oasis:names:tc:SAML:2.0:nameid-format:entity
  • urn:oasis:names:tc:SAML:2.0:nameid-format:kerberos
  • urn:oasis:names:tc:SAML:2.0:nameid-format:persistent
  • urn:oasis:names:tc:SAML:2.0:nameid-format:transient

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