security(oauth): restrict OAuth signing-key settings to system admins

spp_oauth/__manifest__.py

@@ -3,7 +3,7 @@
     "name": "OpenSPP API: Oauth",
     "summary": "The module establishes an OAuth 2.0 authentication framework, securing OpenSPP API communication for integrated systems and applications.",
     "category": "OpenSPP",
-    "version": "19.0.2.0.0",
+    "version": "19.0.2.0.1",
     "author": "OpenSPP.org",
     "development_status": "Production/Stable",
     "maintainers": ["jeremi", "gonzalesedwin1123", "reichie020212"],

spp_oauth/models/res_config_settings.py

@@ -1,5 +1,11 @@
 from odoo import fields, models
 
+# The OAuth signing keys are only meaningful to system administrators. Access to
+# res.config.settings is restricted to base.group_system via Odoo core's ACL (this
+# module no longer widens it), but default_get() reads config_parameter fields with
+# sudo() and performs no access check, so it is guarded explicitly below.
+OAUTH_KEY_FIELDS = ("oauth_priv_key", "oauth_pub_key")
+
 
 class RegistryConfig(models.TransientModel):
     _inherit = "res.config.settings"
@@ -12,3 +18,13 @@ class RegistryConfig(models.TransientModel):
         string="OAuth Public Key",
         config_parameter="spp_oauth.oauth_pub_key",
     )
+
+    def default_get(self, fields_list):
+        res = super().default_get(fields_list)
+        # default_get sources config_parameter values via sudo(), bypassing model
+        # and field access checks. Never expose the OAuth signing keys to a user
+        # who is not a system administrator.
+        if not self.env.user.has_group("base.group_system"):
+            for field_name in OAUTH_KEY_FIELDS:
+                res.pop(field_name, None)
+        return res

spp_oauth/security/ir.model.access.csv

@@ -1,2 +1 @@
 id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
-access_res_config_settings_spp_oauth_user,res.config.settings spp_oauth user,base.model_res_config_settings,base.group_user,1,1,0,0

spp_oauth/tests/__init__.py

@@ -1,2 +1,3 @@
 from . import test_rsa_encode_decode
 from . import test_oauth_errors
+from . import test_config_settings_acl

spp_oauth/tests/test_config_settings_acl.py

@@ -0,0 +1,76 @@
+# Part of OpenSPP. See LICENSE file for full copyright and licensing details.
+"""Security: OAuth signing keys must be restricted to system administrators.
+
+Regression test for "OAuth signing keys exposed to all internal users": the
+module granted ``base.group_user`` read/write on ``res.config.settings``, which
+exposes ``oauth_priv_key`` (the RS256 JWT signing key) and ``oauth_pub_key``.
+Any internal user could therefore:
+  - read the model directly (``read``/``search``) via RPC, and
+  - retrieve the keys through ``res.config.settings.default_get()``, which reads
+    the backing ``ir.config_parameter`` values with ``sudo()`` and performs no
+    model-ACL or field-group check.
+
+Access must require a system administrator (``base.group_system``), and the
+signing keys must not leak through ``default_get`` to non-admins.
+"""
+
+from odoo import Command
+from odoo.exceptions import AccessError
+from odoo.tests import TransactionCase, tagged
+
+PRIV_KEY_SENTINEL = "TEST-OAUTH-PRIVATE-KEY-DO-NOT-LEAK"
+PUB_KEY_SENTINEL = "TEST-OAUTH-PUBLIC-KEY"
+
+
+@tagged("post_install", "-at_install")
+class TestOAuthConfigSettingsAcl(TransactionCase):
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        icp = cls.env["ir.config_parameter"].sudo()
+        icp.set_param("spp_oauth.oauth_priv_key", PRIV_KEY_SENTINEL)
+        icp.set_param("spp_oauth.oauth_pub_key", PUB_KEY_SENTINEL)
+
+        # A plain internal user: base.group_user only, no system access.
+        cls.plain_user = cls.env["res.users"].create(
+            {
+                "name": "Plain Internal User",
+                "login": "plain_internal_oauth_test",
+                "group_ids": [Command.link(cls.env.ref("base.group_user").id)],
+            }
+        )
+        # A system administrator.
+        cls.admin_user = cls.env["res.users"].create(
+            {
+                "name": "System Admin User",
+                "login": "system_admin_oauth_test",
+                "group_ids": [Command.link(cls.env.ref("base.group_system").id)],
+            }
+        )
+
+    def test_plain_user_cannot_access_settings_model(self):
+        """base.group_user (any internal user) must NOT have read access to
+        res.config.settings — that is the model exposing the signing keys."""
+        with self.assertRaises(AccessError):
+            self.env["res.config.settings"].with_user(self.plain_user).check_access("read")
+
+    def test_plain_user_cannot_read_keys_via_default_get(self):
+        """The signing keys must not leak to a non-admin through default_get(),
+        which reads the backing config parameters with sudo()."""
+        settings = self.env["res.config.settings"].with_user(self.plain_user)
+        values = settings.default_get(["oauth_priv_key", "oauth_pub_key"])
+        self.assertNotIn("oauth_priv_key", values)
+        self.assertNotIn("oauth_pub_key", values)
+
+    def test_admin_can_access_settings_model(self):
+        """A system administrator retains read access to res.config.settings."""
+        # Raises AccessError only if admin access was wrongly removed.
+        self.env["res.config.settings"].with_user(self.admin_user).check_access("read")
+
+    def test_admin_can_read_keys_via_default_get(self):
+        """A system administrator can still read the signing keys, so the
+        Settings UI keeps working for admins."""
+        settings = self.env["res.config.settings"].with_user(self.admin_user)
+        values = settings.default_get(["oauth_priv_key", "oauth_pub_key"])
+        self.assertEqual(values.get("oauth_priv_key"), PRIV_KEY_SENTINEL)
+        self.assertEqual(values.get("oauth_pub_key"), PUB_KEY_SENTINEL)