SSO using OpenID Connect (#3899)

* Add SSO functionality using OpenID Connect

Co-authored-by: Pablo Ovelleiro Corral <mail@pablo.tools>
Co-authored-by: Stuart Heap <sheap13@gmail.com>
Co-authored-by: Alex Moore <skiepp@my-dockerfarm.cloud>
Co-authored-by: Brian Munro <brian.alexander.munro@gmail.com>
Co-authored-by: Jacques B. <timshel@github.com>

* Improvements and error handling

* Stop rolling device token

* Add playwright tests

* Activate PKCE by default

* Ensure result order when searching for sso_user

* add SSO_ALLOW_UNKNOWN_EMAIL_VERIFICATION

* Toggle SSO button in scss

* Base64 encode state before sending it to providers

* Prevent disabled User from SSO login

* Review fixes

* Remove unused UserOrganization.invited_by_email

* Split SsoUser::find_by_identifier_or_email

* api::Accounts::verify_password add the policy even if it's ignored

* Disable signups if SSO_ONLY is activated

* Add verifiedDate to organizations::get_org_domain_sso_details

* Review fixes

* Remove OrganizationId guard from get_master_password_policy

* Add wrapper type OIDCCode OIDCState OIDCIdentifier

* Membership::confirm_user_invitations fix and tests

* Allow set-password only if account is unitialized

* Review fixes

* Prevent accepting another user invitation

* Log password change event on SSO account creation

* Unify master password policy resolution

* Upgrade openidconnect to 4.0.0

* Revert "Remove unused UserOrganization.invited_by_email"

This reverts commit 548e19995e141314af98a10d170ea7371f02fab4.

* Process org enrollment in accounts::post_set_password

* Improve tests

* Pass the claim invited_by_email in case it was not in db

* Add Slack configuration hints

* Fix playwright tests

* Skip broken tests

* Add sso identifier in admin user panel

* Remove duplicate expiration check, add a log

* Augment mobile refresh_token validity

* Rauthy configuration hints

* Fix playwright tests

* Playwright upgrade and conf improvement

* Playwright tests improvements

* 2FA email and device creation change

* Fix and improve Playwright tests

* Minor improvements

* Fix enforceOnLogin org policies

* Run playwright sso tests against correct db

* PKCE should now work with Zitadel

* Playwright upgrade maildev to use MailBuffer.expect

* Upgrades playwright tests deps

* Check email_verified in id_token and user_info

* Add sso verified endpoint for v2025.6.0

* Fix playwright tests

* Create a separate sso_client

* Upgrade openidconnect to 4.0.1

* Server settings for login fields toggle

* Use only css for login fields

* Fix playwright test

* Review fix

* More review fix

* Perform same checks when setting kdf

---------

Co-authored-by: Felix Eckhofer <felix@eckhofer.com>
Co-authored-by: Pablo Ovelleiro Corral <mail@pablo.tools>
Co-authored-by: Stuart Heap <sheap13@gmail.com>
Co-authored-by: Alex Moore <skiepp@my-dockerfarm.cloud>
Co-authored-by: Brian Munro <brian.alexander.munro@gmail.com>
Co-authored-by: Jacques B. <timshel@github.com>
Co-authored-by: Timshel <timshel@480s>

src/api/core/mod.rs

@@ -50,11 +50,12 @@ pub fn events_routes() -> Vec<Route> {
 use rocket::{serde::json::Json, serde::json::Value, Catcher, Route};
 
 use crate::{
-    api::{JsonResult, Notify, UpdateType},
+    api::{EmptyResult, JsonResult, Notify, UpdateType},
     auth::Headers,
-    db::DbConn,
+    db::{models::*, DbConn},
     error::Error,
     http_client::make_http_request,
+    mail,
     util::parse_experimental_client_feature_flags,
 };
 
@@ -259,3 +260,49 @@ fn api_not_found() -> Json<Value> {
         }
     }))
 }
+
+async fn accept_org_invite(
+    user: &User,
+    mut member: Membership,
+    reset_password_key: Option<String>,
+    conn: &mut DbConn,
+) -> EmptyResult {
+    if member.status != MembershipStatus::Invited as i32 {
+        err!("User already accepted the invitation");
+    }
+
+    // This check is also done at accept_invite, _confirm_invite, _activate_member, edit_member, admin::update_membership_type
+    // It returns different error messages per function.
+    if member.atype < MembershipType::Admin {
+        match OrgPolicy::is_user_allowed(&member.user_uuid, &member.org_uuid, false, conn).await {
+            Ok(_) => {}
+            Err(OrgPolicyErr::TwoFactorMissing) => {
+                if crate::CONFIG.email_2fa_auto_fallback() {
+                    two_factor::email::activate_email_2fa(user, conn).await?;
+                } else {
+                    err!("You cannot join this organization until you enable two-step login on your user account");
+                }
+            }
+            Err(OrgPolicyErr::SingleOrgEnforced) => {
+                err!("You cannot join this organization because you are a member of an organization which forbids it");
+            }
+        }
+    }
+
+    member.status = MembershipStatus::Accepted as i32;
+    member.reset_password_key = reset_password_key;
+
+    member.save(conn).await?;
+
+    if crate::CONFIG.mail_enabled() {
+        let org = match Organization::find_by_uuid(&member.org_uuid, conn).await {
+            Some(org) => org,
+            None => err!("Organization not found."),
+        };
+        // User was invited to an organization, so they must be confirmed manually after acceptance
+        mail::send_invite_accepted(&user.email, &member.invited_by_email.unwrap_or(org.billing_email), &org.name)
+            .await?;
+    }
+
+    Ok(())
+}