test: add iOS Autofill SDK and well-known simulator

Simulate Bitwarden SDK 3 deny_unknown_fields against projected FIDO2
JSON, hit AASA/related-origins over Rocket local HTTP, and provide a
live sqlite launcher that dual-mounts well-known at / and /vw with
the web vault disabled.

scripts/sim-ios-autofill.sh

@@ -0,0 +1,105 @@
+#!/usr/bin/env bash
+# iOS Autofill simulator / test environment for PR #7728.
+#
+# Two layers:
+#   1. cargo tests — SDK deny_unknown_fields + Rocket local HTTP for well-known
+#   2. live binary — WEB_VAULT_ENABLED=false, DOMAIN with a path prefix, curl origin-root
+#
+# Usage:
+#   ./scripts/sim-ios-autofill.sh           # unit + HTTP tests
+#   ./scripts/sim-ios-autofill.sh --live    # also boot sqlite VW and curl well-known
+set -euo pipefail
+cd "$(dirname "$0")/.."
+
+FEATURES="${TDD_FEATURES:-sqlite}"
+LIVE=0
+if [[ "${1:-}" == "--live" ]]; then
+  LIVE=1
+fi
+
+echo "==> SDK + Rocket well-known simulator"
+cargo test --features "${FEATURES}" --bins sdk_simulator -- --nocapture
+cargo test --features "${FEATURES}" --bins sdk_has_fido2 -- --nocapture
+cargo test --features "${FEATURES}" --bins ios_autofill_sim -- --nocapture
+
+if [[ "${LIVE}" -ne 1 ]]; then
+  echo "==> skip live server (pass --live to curl a launched binary)"
+  exit 0
+fi
+
+PORT="${SIM_PORT:-18282}"
+DATA="$(mktemp -d "${TMPDIR:-/tmp}/vw-ios-autofill.XXXXXX")"
+cleanup() {
+  if [[ -n "${VW_PID:-}" ]] && kill -0 "${VW_PID}" 2>/dev/null; then
+    kill "${VW_PID}" 2>/dev/null || true
+    wait "${VW_PID}" 2>/dev/null || true
+  fi
+  rm -rf "${DATA}"
+}
+trap cleanup EXIT
+
+echo "==> build sqlite binary"
+cargo build --features "${FEATURES}" --bin vaultwarden
+
+echo "==> launch WEB_VAULT_ENABLED=false DOMAIN=.../vw on :${PORT}"
+export DATA_FOLDER="${DATA}"
+export DATABASE_URL="sqlite://${DATA}/db.sqlite3"
+export WEB_VAULT_ENABLED=false
+export DOMAIN="http://127.0.0.1:${PORT}/vw"
+export ROCKET_ADDRESS=127.0.0.1
+export ROCKET_PORT="${PORT}"
+export DISABLE_ADMIN_TOKEN=true
+export I_REALLY_WANT_VOLATILE_STORAGE=true
+export LOG_LEVEL=warn
+
+cargo run --features "${FEATURES}" --bin vaultwarden >/dev/null 2>"${DATA}/vw.log" &
+VW_PID=$!
+
+ok=0
+for _ in $(seq 1 60); do
+  if curl -fsS "http://127.0.0.1:${PORT}/vw/alive" >/dev/null 2>&1; then
+    ok=1
+    break
+  fi
+  if ! kill -0 "${VW_PID}" 2>/dev/null; then
+    echo "vaultwarden exited early:" >&2
+    cat "${DATA}/vw.log" >&2 || true
+    exit 1
+  fi
+  sleep 0.5
+done
+if [[ "${ok}" -ne 1 ]]; then
+  echo "timed out waiting for /vw/alive" >&2
+  cat "${DATA}/vw.log" >&2 || true
+  exit 1
+fi
+
+python3 - "${PORT}" <<'PY'
+import json, sys, urllib.request
+
+port = sys.argv[1]
+base = f"http://127.0.0.1:{port}"
+
+def get(path):
+    with urllib.request.urlopen(base + path) as res:
+        return res.status, json.load(res)
+
+status, aasa_root = get("/.well-known/apple-app-site-association")
+assert status == 200, status
+apps = aasa_root["webcredentials"]["apps"]
+assert "LTZ2PFU5D6.com.8bit.bitwarden.autofill" in apps, apps
+
+status, aasa_path = get("/vw/.well-known/apple-app-site-association")
+assert status == 200, status
+assert aasa_path == aasa_root
+
+status, webauthn = get("/.well-known/webauthn")
+assert status == 200, status
+assert webauthn.get("origins"), webauthn
+
+status, webauthn_path = get("/vw/.well-known/webauthn")
+assert status == 200, status
+assert webauthn_path == webauthn
+
+print("live HTTP: AASA + related-origins OK at / and /vw (web vault off)")
+PY

src/api/mod.rs

@@ -30,6 +30,7 @@ pub use crate::api::{
     },
     web::catchers as web_catchers,
     web::routes as web_routes,
+    web::should_mount_origin_root_well_known,
     web::well_known_routes,
     web::{invalidate_css_cache, static_files},
 };

src/api/web.rs

@@ -204,38 +204,34 @@ fn app_id() -> Cached<(ContentType, Json<Value>)> {
     )
 }
 
+fn aasa_document() -> Value {
+    json!({
+        "webcredentials": {
+            "apps": [
+                "LTZ2PFU5D6.com.8bit.bitwarden",
+                "LTZ2PFU5D6.com.8bit.bitwarden.beta",
+                "LTZ2PFU5D6.com.8bit.bitwarden.autofill"
+            ]
+        }
+    })
+}
+
+fn related_origins_document() -> Value {
+    json!({
+        "origins": [CONFIG.domain_origin()]
+    })
+}
+
 #[get("/.well-known/apple-app-site-association")]
 fn apple_app_site_association() -> Cached<(ContentType, Json<Value>)> {
-    Cached::long(
-        (
-            ContentType::JSON,
-            Json(json!({
-                "webcredentials": {
-                    "apps": [
-                        "LTZ2PFU5D6.com.8bit.bitwarden",
-                        "LTZ2PFU5D6.com.8bit.bitwarden.beta",
-                        "LTZ2PFU5D6.com.8bit.bitwarden.autofill"
-                    ]
-                }
-            })),
-        ),
-        true,
-    )
+    Cached::long((ContentType::JSON, Json(aasa_document())), true)
 }
 
 /// W3C Related Origin Requests. iOS Autofill fetches this when
 /// `pm-30529-webauthn-related-origins` is on.
 #[get("/.well-known/webauthn")]
 fn webauthn_related_origins() -> Cached<(ContentType, Json<Value>)> {
-    Cached::long(
-        (
-            ContentType::JSON,
-            Json(json!({
-                "origins": [CONFIG.domain_origin()]
-            })),
-        ),
-        true,
-    )
+    Cached::long((ContentType::JSON, Json(related_origins_document())), true)
 }
 
 /// Origin-root well-known for Apple AASA / related-origins when DOMAIN has a path prefix.
@@ -243,6 +239,11 @@ pub fn well_known_routes() -> Vec<Route> {
     routes![apple_app_site_association, webauthn_related_origins]
 }
 
+/// Apple only fetches `/.well-known/*` at the origin root. Dual-mount when DOMAIN has a path.
+pub fn should_mount_origin_root_well_known(basepath: &str) -> bool {
+    !basepath.is_empty()
+}
+
 #[get("/<p..>", rank = 10)] // Only match this if the other routes don't match
 async fn web_files(p: PathBuf) -> Cached<Option<NamedFile>> {
     Cached::long(NamedFile::open(Path::new(&CONFIG.web_vault_folder()).join(p)).await.ok(), true)
@@ -325,3 +326,60 @@ pub fn static_files(filename: &str) -> Result<(ContentType, &'static [u8]), Erro
         _ => err!(format!("Static file not found: {filename}")),
     }
 }
+
+#[cfg(test)]
+mod ios_autofill_sim {
+    use super::*;
+    use rocket::{http::Status, local::blocking::Client};
+
+    fn well_known_client() -> Client {
+        Client::tracked(rocket::build().mount("/", well_known_routes())).expect("rocket well-known client")
+    }
+
+    #[test]
+    fn aasa_includes_autofill_extension() {
+        let document = aasa_document();
+        let apps = document["webcredentials"]["apps"].as_array().expect("apps");
+        assert!(apps.iter().any(|app| app == "LTZ2PFU5D6.com.8bit.bitwarden.autofill"));
+    }
+
+    #[test]
+    fn related_origins_lists_vault_origin() {
+        let document = related_origins_document();
+        let origins = document["origins"].as_array().expect("origins");
+        assert_eq!(origins.len(), 1);
+        assert!(origins[0].as_str().is_some_and(|o| !o.is_empty()));
+    }
+
+    #[test]
+    fn origin_root_mount_when_domain_has_path() {
+        assert!(should_mount_origin_root_well_known("/vw"));
+        assert!(!should_mount_origin_root_well_known(""));
+    }
+
+    #[test]
+    fn aasa_http_includes_autofill_app_id() {
+        let client = well_known_client();
+        let res = client.get("/.well-known/apple-app-site-association").dispatch();
+        assert_eq!(res.status(), Status::Ok);
+        let body: Value = res.into_json().expect("aasa json");
+        let apps = body["webcredentials"]["apps"].as_array().expect("apps");
+        assert!(apps.iter().any(|app| app == "LTZ2PFU5D6.com.8bit.bitwarden.autofill"));
+    }
+
+    #[test]
+    fn webauthn_http_lists_related_origins() {
+        let client = well_known_client();
+        let res = client.get("/.well-known/webauthn").dispatch();
+        assert_eq!(res.status(), Status::Ok);
+        let body: Value = res.into_json().expect("webauthn json");
+        assert!(body["origins"].as_array().is_some_and(|o| !o.is_empty()));
+    }
+
+    #[test]
+    fn web_routes_always_include_passkey_well_known() {
+        let uris: Vec<String> = routes().iter().map(|route| format!("{}", route.uri)).collect();
+        assert!(uris.iter().any(|uri| uri.contains("apple-app-site-association")));
+        assert!(uris.iter().any(|uri| uri.contains("webauthn")));
+    }
+}

src/db/models/cipher_login.rs

@@ -81,6 +81,7 @@ fn project_object_keys(value: &Value, allow: &[&str]) -> Value {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use serde::Deserialize;
     use serde_json::json;
 
     #[test]
@@ -198,6 +199,83 @@ mod tests {
         assert_eq!(normalize_login_type_data(json!([])), json!([]));
     }
 
+    /// Mirrors Bitwarden SDK 3 `Fido2Credential` (`deny_unknown_fields`).
+    /// iOS Autofill maps a deserialize InnerError here to CTAP2 VendorError(240).
+    #[derive(Debug, Deserialize)]
+    #[serde(rename_all = "camelCase", deny_unknown_fields)]
+    #[allow(dead_code)]
+    struct SdkFido2Credential {
+        credential_id: Option<String>,
+        key_type: Option<String>,
+        key_algorithm: Option<String>,
+        key_curve: Option<String>,
+        key_value: Option<String>,
+        rp_id: Option<String>,
+        user_handle: Option<String>,
+        user_name: Option<String>,
+        counter: Option<String>,
+        rp_name: Option<String>,
+        user_display_name: Option<String>,
+        discoverable: Option<String>,
+        creation_date: Option<String>,
+    }
+
+    #[derive(Debug, Deserialize)]
+    #[serde(rename_all = "camelCase")]
+    struct SdkLogin {
+        fido2_credentials: Option<Vec<SdkFido2Credential>>,
+    }
+
+    fn extra_key_credential() -> Value {
+        json!({
+            "credentialId": "enc-id",
+            "keyType": "enc-type",
+            "keyAlgorithm": "enc-alg",
+            "keyCurve": "enc-curve",
+            "keyValue": "enc-key",
+            "rpId": "enc-rp",
+            "userHandle": "enc-uh",
+            "userName": "enc-un",
+            "counter": "enc-c",
+            "rpName": "enc-rn",
+            "userDisplayName": "enc-dn",
+            "discoverable": "enc-d",
+            "creationDate": "2024-06-07T14:12:36.150000Z",
+            "prf": {"enabled": true},
+            "transports": ["internal"],
+            "backupEligible": true
+        })
+    }
+
+    #[test]
+    fn sdk_simulator_rejects_extra_keys_like_ios_vendor_error_240() {
+        let err = serde_json::from_value::<SdkFido2Credential>(extra_key_credential()).unwrap_err();
+        assert!(
+            err.to_string().contains("unknown field"),
+            "SDK deny_unknown_fields must fail on prf/transports/backupEligible: {err}"
+        );
+    }
+
+    #[test]
+    fn sdk_simulator_accepts_projected_credentials() {
+        let out = normalize_login_type_data(json!({
+            "username": "enc",
+            "fido2Credentials": [extra_key_credential()]
+        }));
+        let login: SdkLogin = serde_json::from_value(out).expect("projected login must deserialize");
+        assert!(login.fido2_credentials.as_ref().is_some_and(|creds| creds.len() == 1));
+    }
+
+    #[test]
+    fn sdk_has_fido2_is_none_after_empty_array_is_normalized() {
+        let out = normalize_login_type_data(json!({"fido2Credentials": []}));
+        let login: SdkLogin = serde_json::from_value(out).expect("login");
+        assert!(
+            login.fido2_credentials.is_none(),
+            "SDK has_fido2 is is_some(); [] would mark every login as a passkey"
+        );
+    }
+
     #[test]
     fn normalize_is_idempotent_for_sdk_shaped_credentials() {
         let input = json!({

src/main.rs

@@ -588,7 +588,7 @@ async fn launch_rocket(pool: db::DbPool, extra_debug: bool) -> Result<(), Error>
         .mount([basepath, "/icons"].concat(), api::icons_routes())
         .mount([basepath, "/notifications"].concat(), api::notifications_routes());
     // Apple associated-domains and related-origins are origin-root only.
-    if !basepath.is_empty() {
+    if api::should_mount_origin_root_well_known(basepath) {
         instance = instance.mount("/", api::well_known_routes());
     }
     let instance = instance