fix(slack): gate DM slash command authorization

CHANGELOG.md

@@ -28,6 +28,7 @@ Docs: https://docs.openclaw.ai
 - Security/Google Chat: deprecate `users/<email>` allowlists (treat `users/...` as immutable user id only); keep raw email allowlists for usability. Thanks @vincentkoc.
 - Security/Google Chat: reject ambiguous shared-path webhook routing when multiple webhook targets verify successfully (prevents cross-account policy-context misrouting). Thanks @vincentkoc.
 - Security/Browser: block cross-origin mutating requests to loopback browser control routes (CSRF hardening). Thanks @vincentkoc.
+- Security/Slack: compute command authorization for DM slash commands even when `dmPolicy=open`, preventing unauthorized users from running privileged commands via DM. Thanks @christos-eth.
 - Security/Nostr: require loopback source and block cross-origin profile mutation/import attempts. Thanks @vincentkoc.
 - Security/Archive: enforce archive extraction entry/size limits to prevent resource exhaustion from high-expansion ZIP/TAR archives. Thanks @vincentkoc.
 - Security/Media: reject oversized base64-backed input media before decoding to avoid large allocations. Thanks @vincentkoc.

src/slack/monitor/slash.policy.test.ts

@@ -267,6 +267,45 @@ describe("slack slash commands access groups", () => {
     expect(respond).not.toHaveBeenCalledWith(
       expect.objectContaining({ text: "You are not authorized to use this command." }),
     );
+    const dispatchArg = dispatchMock.mock.calls[0]?.[0] as {
+      ctx?: { CommandAuthorized?: boolean };
+    };
+    expect(dispatchArg?.ctx?.CommandAuthorized).toBe(false);
+  });
+
+  it("computes CommandAuthorized for DM slash commands when dmPolicy is open", async () => {
+    const { commands, ctx, account } = createHarness({
+      allowFrom: ["U_OWNER"],
+      channelId: "D999",
+      channelName: "directmessage",
+      resolveChannelName: async () => ({ name: "directmessage", type: "im" }),
+    });
+    registerSlackMonitorSlashCommands({ ctx: ctx as never, account: account as never });
+
+    const handler = [...commands.values()][0];
+    if (!handler) {
+      throw new Error("Missing slash handler");
+    }
+
+    const respond = vi.fn().mockResolvedValue(undefined);
+    await handler({
+      command: {
+        user_id: "U_ATTACKER",
+        user_name: "Mallory",
+        channel_id: "D999",
+        channel_name: "directmessage",
+        text: "hello",
+        trigger_id: "t1",
+      },
+      ack: vi.fn().mockResolvedValue(undefined),
+      respond,
+    });
+
+    expect(dispatchMock).toHaveBeenCalledTimes(1);
+    const dispatchArg = dispatchMock.mock.calls[0]?.[0] as {
+      ctx?: { CommandAuthorized?: boolean };
+    };
+    expect(dispatchArg?.ctx?.CommandAuthorized).toBe(false);
   });
 
   it("enforces access-group gating when lookup fails for private channels", async () => {

src/slack/monitor/slash.ts

@@ -204,7 +204,9 @@ export function registerSlackMonitorSlashCommands(params: {
       const effectiveAllowFrom = normalizeAllowList([...ctx.allowFrom, ...storeAllowFrom]);
       const effectiveAllowFromLower = normalizeAllowListLower(effectiveAllowFrom);
 
-      let commandAuthorized = true;
+      // Privileged command surface: compute CommandAuthorized, don't assume true.
+      // Keep this aligned with the Slack message path (message-handler/prepare.ts).
+      let commandAuthorized = false;
       let channelConfig: SlackChannelConfigResolved | null = null;
       if (isDirectMessage) {
         if (!ctx.dmEnabled || ctx.dmPolicy === "disabled") {
@@ -256,7 +258,6 @@ export function registerSlackMonitorSlashCommands(params: {
             }
             return;
           }
-          commandAuthorized = true;
         }
       }
 
@@ -322,6 +323,13 @@ export function registerSlackMonitorSlashCommands(params: {
         id: command.user_id,
         name: senderName,
       }).allowed;
+      // DMs: allow chatting in dmPolicy=open, but keep privileged command gating intact by setting
+      // CommandAuthorized based on allowlists/access-groups (downstream decides which commands need it).
+      commandAuthorized = resolveCommandAuthorizedFromAuthorizers({
+        useAccessGroups: ctx.useAccessGroups,
+        authorizers: [{ configured: effectiveAllowFromLower.length > 0, allowed: ownerAllowed }],
+        modeWhenAccessGroupsOff: "configured",
+      });
       if (isRoomish) {
         commandAuthorized = resolveCommandAuthorizedFromAuthorizers({
           useAccessGroups: ctx.useAccessGroups,
@@ -329,6 +337,7 @@ export function registerSlackMonitorSlashCommands(params: {
             { configured: effectiveAllowFromLower.length > 0, allowed: ownerAllowed },
             { configured: channelUsersAllowlistConfigured, allowed: channelUserAllowed },
           ],
+          modeWhenAccessGroupsOff: "configured",
         });
         if (ctx.useAccessGroups && !commandAuthorized) {
           await respond({