docs: added identity-center.md doc for AWS SSO (argoproj#15689)

* docs: added identity center doc (AWS SSO)

Signed-off-by: zeusal <zeusariaslucero@gmail.com>

* Apply suggestions from code review

Co-authored-by: Carlos Santana <csantana23@gmail.com>
Signed-off-by: Zeus Arias Lucero <33123154+zeusal@users.noreply.github.com>

* Update identity-center.md

Added note for attribute mapping 

Signed-off-by: Zeus Arias Lucero <33123154+zeusal@users.noreply.github.com>

* Update identity-center.md

Signed-off-by: Zeus Arias Lucero <33123154+zeusal@users.noreply.github.com>

* Update docs/operator-manual/user-management/identity-center.md

Co-authored-by: Justin Marquis <76892343+34fathombelow@users.noreply.github.com>
Signed-off-by: Zeus Arias Lucero <33123154+zeusal@users.noreply.github.com>

* Update identity-center.md

Signed-off-by: Zeus Arias Lucero <33123154+zeusal@users.noreply.github.com>

Fixed image order and style doc

Update identity-center.md

Signed-off-by: Zeus Arias Lucero <33123154+zeusal@users.noreply.github.com>

Update identity-center.md

Signed-off-by: Zeus Arias Lucero <33123154+zeusal@users.noreply.github.com>

* Update identity-center.md

Signed-off-by: Zeus Arias Lucero <33123154+zeusal@users.noreply.github.com>

---------

Signed-off-by: zeusal <zeusariaslucero@gmail.com>
Signed-off-by: Zeus Arias Lucero <33123154+zeusal@users.noreply.github.com>
Co-authored-by: Zeus Arias <zeus.ariaslucero@ust.com>
Co-authored-by: Carlos Santana <csantana23@gmail.com>
Co-authored-by: Justin Marquis <76892343+34fathombelow@users.noreply.github.com>

docs/operator-manual/user-management/identity-center.md

@@ -0,0 +1,79 @@
+# Identity Center (AWS SSO)
+
+!!! note "Are you using this? Please contribute!"
+    If you're using this IdP please consider [contributing](../../developer-guide/site.md) to this document.
+
+A working Single Sign-On configuration using Identity Center (AWS SSO) has been achieved using the following method:
+
+* [SAML (with Dex)](#saml-with-dex)
+
+## SAML (with Dex)
+
+1. Create a new SAML application in Identity Center and download the certificate.
+    * ![Identity Center SAML App 1](../../assets/identity-center-1.png)
+    * ![Identity Center SAML App 2](../../assets/identity-center-2.png)
+2. Click `Assign Users` after creating the application in Identity Center, and select the users or user groups you wish to grant access to this application.
+    * ![Identity Center SAML App 3](../../assets/identity-center-3.png)
+3. Copy the Argo CD URL into the `data.url` field in the `argocd-cm` ConfigMap.
+
+        data:
+          url: https://argocd.example.com
+
+4. Configure Attribute mappings.
+
+    !!! note "Group attribute mapping is not officially!"
+        Group attribute mapping is not officially supported in the AWS docs, however the workaround is currently working.
+
+    * ![Identity Center SAML App 4](../../assets/identity-center-4.png)
+    * ![Identity Center SAML App 5](../../assets/identity-center-5.png)
+
+<!-- markdownlint-enable MD046 -->
+
+5. Download the CA certificate to use in the `argocd-cm` configuration.
+    * If using the `caData` field, you'll need to base64-encode the entire certificate, including the `-----BEGIN CERTIFICATE-----` and `-----END CERTIFICATE-----` stanzas (e.g., `base64 my_cert.pem`).
+    * If using the `ca` field and storing the CA certificate separately as a secret, you will need to mount the secret onto the `dex` container in the `argocd-dex-server` Deployment.
+    * ![Identity Center SAML App 6](../../assets/identity-center-6.png)
+6. Edit the `argocd-cm` and configure the `data.dex.config` section:
+
+<!-- markdownlint-disable MD046 -->
+```yaml
+dex.config: |
+  logger:
+    level: debug
+    format: json
+  connectors:
+  - type: saml
+    id: aws
+    name: "AWS IAM Identity Center"
+    config:
+      # You need value of Identity Center APP SAML (IAM Identity Center sign-in URL)
+      ssoURL: https://portal.sso.yourregion.amazonaws.com/saml/assertion/id
+      # You need `caData` _OR_ `ca`, but not both.
+      caData: <CA cert (IAM Identity Center Certificate of Identity Center APP SAML) passed through base64 encoding>
+      # Path to mount the secret to the dex container
+      entityIssuer: https://external.path.to.argocd.io/api/dex/callback
+      redirectURI: https://external.path.to.argocd.io/api/dex/callback
+      usernameAttr: email
+      emailAttr: email
+      groupsAttr: groups
+```
+<!-- markdownlint-enable MD046 -->
+
+### Connect Identity Center Groups to Argo CD Roles
+Argo CD recognizes user memberships in Identity Center groups that match the **Group Attribute Statements** regex. 
+
+ In the example above, the regex `argocd-*` is used, making Argo CD aware of a group named `argocd-admins`.
+
+Modify the `argocd-rbac-cm` ConfigMap to connect the `ArgoCD-administrators` Identity Center group to the builtin Argo CD `admin` role.
+<!-- markdownlint-disable MD046 -->
+```yaml
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: argocd-rbac-cm
+data:
+  policy.csv: |
+    g, <Identity Center Group ID>, role:admin
+  scopes: '[groups, email]'
+```
+<!-- markdownlint-enable MD046 -->

mkdocs.yml

@@ -40,6 +40,7 @@ nav:
     - operator-manual/user-management/openunison.md
     - operator-manual/user-management/google.md
     - operator-manual/user-management/zitadel.md
+    - operator-manual/user-management/identity-center.md
     - operator-manual/rbac.md
   - Security:
     - Overview: operator-manual/security.md