RBAC Configuration

The RBAC feature enables restriction of access to Argo CD resources. Argo CD does not have its own user management system and has only one built-in user admin. The admin user is a superuser and it has unrestricted access to the system. RBAC requires SSO configuration or one or more local users setup. Once SSO or local users are configured, additional RBAC roles can be defined, and SSO groups or local users can then be mapped to roles.

Basic Built-in Roles

Argo CD has two pre-defined roles but RBAC configuration allows defining roles and groups (see below).

  • role:readonly - read-only access to all resources
  • role:admin - unrestricted access to all resources

These default built-in role definitions can be seen in builtin-policy.csv

RBAC Permission Structure

Breaking down the permissions definition differs slightly between applications and every other resource type in Argo CD.

  • All resources except applications permissions (see next bullet):

    p, <role/user/group>, <resource>, <action>, <object>

  • Applications (which belong to an AppProject):

    p, <role/user/group>, <resource>, <action>, <appproject>/<object>

RBAC Resources and Actions

Resources: clusters, projects, applications, repositories, certificates, accounts, gpgkeys

Actions: get, create, update, delete, sync, override, action

Tying It All Together

Additional roles and groups can be configured in argocd-rbac-cm ConfigMap. The example below configures a custom role, named org-admin. The role is assigned to any user which belongs to your-github-org:your-team group. All other users get the default policy of role:readonly, which cannot modify Argo CD settings.

Warning

All authenticated users get at least the permissions granted by the default policy. This access cannot be blocked by a deny rule. Instead, restrict the default policy and then grant permissions to individual roles as needed.

ArgoCD ConfigMap argocd-rbac-cm Example:

  1. apiVersion: v1
  2. kind: ConfigMap
  3. metadata:
  4.   name: argocd-rbac-cm
  5.   namespace: argocd
  6. data:
  7.   policy.default: role:readonly
  8.   policy.csv: |
  9.     p, role:org-admin, applications, *, */*, allow
  10.     p, role:org-admin, clusters, get, *, allow
  11.     p, role:org-admin, repositories, get, *, allow
  12.     p, role:org-admin, repositories, create, *, allow
  13.     p, role:org-admin, repositories, update, *, allow
  14.     p, role:org-admin, repositories, delete, *, allow
  16.     g, your-github-org:your-team, role:org-admin

Another policy.csv example might look as follows:

  1. p, role:staging-db-admins, applications, create, staging-db-admins/*, allow
  2. p, role:staging-db-admins, applications, delete, staging-db-admins/*, allow
  3. p, role:staging-db-admins, applications, get, staging-db-admins/*, allow
  4. p, role:staging-db-admins, applications, override, staging-db-admins/*, allow
  5. p, role:staging-db-admins, applications, sync, staging-db-admins/*, allow
  6. p, role:staging-db-admins, applications, update, staging-db-admins/*, allow
  7. p, role:staging-db-admins, projects, get, staging-db-admins, allow
  8. g, db-admins, role:staging-db-admins

This example defines a role called staging-db-admins with seven permissions that allow that role to perform the actions (create/delete/get/override/sync/update applications, and get appprojects) against * (all) objects in the staging-db-admins Argo CD AppProject.

Anonymous Access

The anonymous access to Argo CD can be enabled using users.anonymous.enabled field in argocd-cm (see argocd-cm.yaml). The anonymous users get default role permissions specified by policy.default in argocd-rbac-cm.yaml. For read-only access you’ll want policy.default: role:readonly as above

Validating and testing your RBAC policies

If you want to ensure that your RBAC policies are working as expected, you can use the argocd admin settings rbac command to validate them. This tool allows you to test whether a certain role or subject can perform the requested action with a policy that’s not live yet in the system, i.e. from a local file or config map. Additionally, it can be used against the live policy in the cluster your Argo CD is running in.

To check whether your new policy is valid and understood by Argo CD’s RBAC implementation, you can use the argocd admin settings rbac validate command.

Validating a policy

To validate a policy stored in a local text file:

  1. argocd admin settings rbac validate --policy-file somepolicy.csv

To validate a policy stored in a local K8s ConfigMap definition in a YAML file:

  1. argocd admin settings rbac validate --policy-file argocd-rbac-cm.yaml

To validate a policy stored in K8s, used by Argo CD in namespace argocd, ensure that your current context in ~/.kube/config is pointing to your Argo CD cluster and give appropriate namespace:

  1. argocd admin settings rbac validate --namespace argocd

Testing a policy

To test whether a role or subject (group or local user) has sufficient permissions to execute certain actions on certain resources, you can use the argocd admin settings rbac can command. Its general syntax is

  1. argocd admin settings rbac can SOMEROLE ACTION RESOURCE SUBRESOURCE [flags]

Given the example from the above ConfigMap, which defines the role role:org-admin, and is stored on your local system as argocd-rbac-cm-yaml, you can test whether that role can do something like follows:

  1. $ argocd admin settings rbac can role:org-admin get applications --policy-file argocd-rbac-cm.yaml
  2. Yes
  3. $ argocd admin settings rbac can role:org-admin get clusters --policy-file argocd-rbac-cm.yaml
  4. Yes
  5. $ argocd admin settings rbac can role:org-admin create clusters 'somecluster' --policy-file argocd-rbac-cm.yaml
  6. No
  7. $ argocd admin settings rbac can role:org-admin create applications 'someproj/someapp' --policy-file argocd-rbac-cm.yaml
  8. Yes

Another example, given the policy above from policy.csv, which defines the role role:staging-db-admins and associates the group db-admins with it. Policy is stored locally as policy.csv:

You can test against the role:

  1. # Plain policy, without a default role defined
  2. $ argocd admin settings rbac can role:staging-db-admins get applications --policy-file policy.csv
  3. No
  4. $ argocd admin settings rbac can role:staging-db-admins get applications 'staging-db-admins/*' --policy-file policy.csv
  5. Yes
  6. # Argo CD augments a builtin policy with two roles defined, the default role
  7. # being 'role:readonly' - You can include a named default role to use:
  8. $ argocd admin settings rbac can role:staging-db-admins get applications --policy-file policy.csv --default-role role:readonly
  9. Yes

Or against the group defined:

  1. $ argocd admin settings rbac can db-admins get applications 'staging-db-admins/*' --policy-file policy.csv
  2. Yes