fix(permissions): skip rm -rf prompts for /tmp and /temp paths

.changeset/rm-rf-temp-paths.md

@@ -0,0 +1,5 @@
+---
+"@pymodel/pythinker-code": patch
+---
+
+Skip the confirmation prompt for rm -rf commands that target only /tmp or /temp paths.

docs/configuration/config-files.md

@@ -513,7 +513,7 @@ api_key = "sk-xxx"
 
 `permission` sets permission rules that are automatically loaded when a session starts, controlling whether the Agent needs user confirmation before calling a tool. Rules are written as a `[[permission.rules]]` array of tables, matched in order — the first matching rule takes effect.
 
-The dangerous-command guard is enabled by default. In Always Ask and Ask When Needed modes, it requests confirmation for dangerous or unanalyzable `Bash` commands. Allow rules cannot bypass this guard. Never Ask mode and non-interactive execution skip the guard; explicit deny rules still apply. Set `dangerous_command_guard = false`, or `PYTHINKER_CODE_DANGEROUS_COMMAND_GUARD=false`, to disable it in other modes.
+The dangerous-command guard is enabled by default. In Always Ask and Ask When Needed modes, it requests confirmation for dangerous or unanalyzable `Bash` commands. Allow rules cannot bypass this guard. Recursive force `rm` (`rm -rf`) of literal paths under `/tmp` or `/temp` that still resolve inside those directories does not require confirmation; mixed, non-literal, escaped, or out-of-prefix targets still do. If that resolution is unavailable, confirmation is required. Never Ask mode and non-interactive execution skip the guard; explicit deny rules still apply. Set `dangerous_command_guard = false`, or `PYTHINKER_CODE_DANGEROUS_COMMAND_GUARD=false`, to disable it in other modes.
 
 ```toml
 [permission]

packages/agent-core-v2/src/agent/permissionPolicy/policies/dangerous-command-ask.ts

@@ -4,6 +4,9 @@ import {
   type BashSyntaxNode,
 } from '#/app/bashParser/bashParser';
 import { IConfigService } from '#/app/config/config';
+import { IHostEnvironment, type PathClass } from '#/os/interface/hostEnvironment';
+import { IHostFileSystem } from '#/os/interface/hostFileSystem';
+import { isWithinDirectory, resolveRealTarget } from '#/tool/path-access';
 import { IAgentPermissionModeService } from '#/agent/permissionMode/permissionMode';
 import { isDangerousCommandGuardEnabled } from '#/agent/permissionRules/configSection';
 import type { ResolvedToolExecutionHookContext } from '#/agent/toolExecutor/toolHooks';
@@ -104,9 +107,41 @@ const DD_SAFE_DEVICE_TARGETS: ReadonlySet<string> = new Set([
   '/dev/stderr',
 ]);
 
+const RM_SAFE_TEMP_ROOTS: readonly string[] = ['/tmp', '/temp'];
+
+function isSafeTempRmOperand(operand: string): boolean {
+  for (const segment of operand.split('/')) {
+    if (segment === '..') return false;
+  }
+  return RM_SAFE_TEMP_ROOTS.some((root) => operand === root || operand.startsWith(`${root}/`));
+}
+
+async function operandResolvesInsideTemp(
+  fs: Pick<IHostFileSystem, 'realpath'>,
+  pathClass: PathClass,
+  operand: string,
+): Promise<boolean> {
+  let resolved: string;
+  try {
+    resolved = await resolveRealTarget(fs, operand);
+  } catch {
+    return false;
+  }
+  for (const root of RM_SAFE_TEMP_ROOTS) {
+    try {
+      const realRoot = await fs.realpath(root);
+      if (isWithinDirectory(resolved, realRoot, pathClass)) return true;
+    } catch {
+      continue;
+    }
+  }
+  return false;
+}
+
 type DangerousVerdict =
   | { readonly kind: 'dangerous'; readonly command: string }
-  | { readonly kind: 'unanalyzable' };
+  | { readonly kind: 'unanalyzable' }
+  | { readonly kind: 'temp-rm'; readonly operands: readonly string[] };
 
 export class DangerousCommandAskPermissionPolicyService implements PermissionPolicy {
   readonly name = 'dangerous-command-ask';
@@ -115,9 +150,11 @@ export class DangerousCommandAskPermissionPolicyService implements PermissionPol
     @IBashParserService private readonly bashParser: IBashParserService,
     @IAgentPermissionModeService private readonly modeService: IAgentPermissionModeService,
     @IConfigService private readonly config: IConfigService,
+    @IHostFileSystem private readonly hostFs: IHostFileSystem,
+    @IHostEnvironment private readonly env: IHostEnvironment,
   ) {}
 
-  evaluate(context: ResolvedToolExecutionHookContext): PermissionPolicyResult | undefined {
+  async evaluate(context: ResolvedToolExecutionHookContext): Promise<PermissionPolicyResult | undefined> {
     if (!isDangerousCommandGuardEnabled(this.config)) return undefined;
     if (this.modeService.mode === 'auto') return undefined;
     if (context.toolCall.name !== 'Bash') return undefined;
@@ -129,6 +166,22 @@ export class DangerousCommandAskPermissionPolicyService implements PermissionPol
             this.bashParser.parse(source, PARSE_OPTIONS),
           );
     if (verdict === undefined) return undefined;
+    if (verdict.kind === 'temp-rm') {
+      let contained = false;
+      try {
+        contained = (
+          await Promise.all(
+            verdict.operands.map((operand) =>
+              operandResolvesInsideTemp(this.hostFs, this.env.pathClass, operand),
+            ),
+          )
+        ).every(Boolean);
+      } catch {
+        contained = false;
+      }
+      if (contained) return undefined;
+      return { kind: 'ask', reason: { dangerous_command: 'rm -rf' } };
+    }
     if (verdict.kind === 'dangerous') {
       return { kind: 'ask', reason: { dangerous_command: verdict.command } };
     }
@@ -151,10 +204,17 @@ function analyzeSource(
   if (!parsed.ok || parsed.hasError) return { kind: 'unanalyzable' };
   const commands: BashSyntaxNode[] = [];
   collectCommands(parsed.root, commands);
+  const tempOperands: string[] = [];
   for (const command of commands) {
     const verdict = analyzeCommand(command, depth, parse);
-    if (verdict !== undefined) return verdict;
+    if (verdict === undefined) continue;
+    if (verdict.kind === 'temp-rm') {
+      tempOperands.push(...verdict.operands);
+      continue;
+    }
+    return verdict;
   }
+  if (tempOperands.length > 0) return { kind: 'temp-rm', operands: tempOperands };
   return undefined;
 }
 
@@ -273,18 +333,34 @@ function analyzeInvocation(
   if (name === 'rm') {
     let recursive = false;
     let force = false;
+    const operands: string[] = [];
+    let optionsEnded = false;
     for (const arg of args) {
-      if (arg === '--') break;
+      if (!optionsEnded && arg === '--') {
+        optionsEnded = true;
+        continue;
+      }
+      if (optionsEnded) {
+        operands.push(arg);
+        continue;
+      }
       if (arg === '--recursive') {
         recursive = true;
       } else if (arg === '--force') {
         force = true;
       } else if (/^-[a-zA-Z]+$/.test(arg)) {
         if (/[rR]/.test(arg)) recursive = true;
         if (arg.includes('f')) force = true;
+      } else {
+        operands.push(arg);
+      }
+    }
+    if (recursive && force) {
+      if (!dropped && operands.length > 0 && operands.every(isSafeTempRmOperand)) {
+        return { kind: 'temp-rm', operands };
       }
+      return { kind: 'dangerous', command: 'rm -rf' };
     }
-    if (recursive && force) return { kind: 'dangerous', command: 'rm -rf' };
     return dropped ? { kind: 'unanalyzable' } : undefined;
   }
   return undefined;

packages/agent-core-v2/test/agent/permissionPolicy/permissionPolicyService.test.ts

@@ -15,6 +15,7 @@ import {
 } from '#/tool/rule-match';
 import type { ResolvedToolExecutionHookContext } from '#/agent/toolExecutor/toolHooks';
 import { IHostEnvironment, type IHostEnvironment as HostEnvironmentService } from '#/os/interface/hostEnvironment';
+import { IHostFileSystem } from '#/os/interface/hostFileSystem';
 import { IAgentPermissionModeService } from '#/agent/permissionMode/permissionMode';
 import { IAgentPermissionPolicyService, type PermissionPolicyEvaluation } from '#/agent/permissionPolicy/permissionPolicy';
 import type { PermissionMode } from '#/agent/permissionPolicy/types';
@@ -54,6 +55,7 @@ describe('AgentPermissionPolicyService chain', () => {
   let workspace: ReturnType<typeof workspaceStub>;
   let hostArgs: HostArgs;
   let dangerousCommandGuardEnabled: boolean;
+  let resolveRealpath: (path: string) => Promise<string>;
 
   beforeEach(() => {
     disposables = new DisposableStore();
@@ -63,6 +65,12 @@ describe('AgentPermissionPolicyService chain', () => {
     workspace = workspaceStub('/workspace');
     hostArgs = { requestHeaders: {}, nonInteractive: false };
     dangerousCommandGuardEnabled = true;
+    resolveRealpath = async (path) => {
+      for (const root of ['/tmp', '/temp'] as const) {
+        if (path === root || path.startsWith(`${root}/`)) return path;
+      }
+      throw Object.assign(new Error('ENOENT'), { code: 'ENOENT' });
+    };
     ix = createServices(disposables, {
       additionalServices: (reg) => {
         reg.defineInstance(IAgentPermissionModeService, stubPermissionModeService(() => mode));
@@ -88,6 +96,9 @@ describe('AgentPermissionPolicyService chain', () => {
         }));
         reg.defineInstance(ISessionWorkspaceContext, workspace.stub);
         reg.defineInstance(IHostEnvironment, pyaosStub());
+        reg.definePartialInstance(IHostFileSystem, {
+          realpath: (path: string) => resolveRealpath(path),
+        });
         reg.defineInstance(IAgentRuntimeService, {
           _serviceBrand: undefined,
           onDidChange: () => ({ dispose: () => {} }),
@@ -274,7 +285,10 @@ describe('AgentPermissionPolicyService chain', () => {
     ['systemctl poweroff', 'systemctl poweroff'],
     ['systemctl --user reboot', 'systemctl reboot'],
     ['bash -c "shutdown now"', 'shutdown'],
-    ['rm -rf /tmp/build', 'rm -rf'],
+    ['rm -rf /tmp/build /root', 'rm -rf'],
+    ['rm -rf /tmp/build && rm -rf /root', 'rm -rf'],
+    ['rm -rf /tmp/../etc', 'rm -rf'],
+    ['rm -rf /tmpfoo', 'rm -rf'],
     ['rm -fr dir', 'rm -rf'],
     ['rm -r -f dir', 'rm -rf'],
     ['rm -R --force dir', 'rm -rf'],
@@ -311,6 +325,58 @@ describe('AgentPermissionPolicyService chain', () => {
     });
   });
 
+  it.each([
+    'rm -rf /tmp/build',
+    'rm -rf /temp/cache',
+    'rm -rf -- /tmp/build',
+    'rm -rf /tmp/build && rm -rf /temp/cache',
+  ])(
+    'approves `%s` in yolo mode',
+    async (command) => {
+      mode = 'yolo';
+
+      await expect(evaluate({
+        toolName: 'Bash',
+        args: { command, timeout: 60 },
+      })).resolves.toMatchObject({
+        policyName: 'yolo-mode-approve',
+        result: { kind: 'approve' },
+      });
+    },
+  );
+
+  it('asks for rm -rf of a temp path that realpath-escapes in yolo mode', async () => {
+    mode = 'yolo';
+    resolveRealpath = async (path) => {
+      if (path === '/tmp/build') return '/etc';
+      if (path === '/tmp' || path.startsWith('/tmp/')) return path;
+      throw Object.assign(new Error('ENOENT'), { code: 'ENOENT' });
+    };
+
+    await expect(evaluate({
+      toolName: 'Bash',
+      args: { command: 'rm -rf /tmp/build', timeout: 60 },
+    })).resolves.toMatchObject({
+      policyName: 'dangerous-command-ask',
+      result: { kind: 'ask', reason: { dangerous_command: 'rm -rf' } },
+    });
+  });
+
+  it('asks for rm -rf of a temp path when filesystem realpath fails in yolo mode', async () => {
+    mode = 'yolo';
+    resolveRealpath = async () => {
+      throw new Error('unavailable');
+    };
+
+    await expect(evaluate({
+      toolName: 'Bash',
+      args: { command: 'rm -rf /tmp/build', timeout: 60 },
+    })).resolves.toMatchObject({
+      policyName: 'dangerous-command-ask',
+      result: { kind: 'ask', reason: { dangerous_command: 'rm -rf' } },
+    });
+  });
+
   it.each([
     'init 3',
     'dd if=/dev/zero of=/dev/null bs=1M count=1',
@@ -482,6 +548,7 @@ describe('AgentPermissionPolicyService git cwd write approval', () => {
         reg.definePartialInstance(IAgentPermissionRulesService, permissionRulesStub());
         reg.defineInstance(ISessionWorkspaceContext, workspace.stub);
         reg.defineInstance(IHostEnvironment, pyaosStub());
+        reg.defineInstance(IHostFileSystem, hostFs);
         reg.defineInstance(IAgentRuntimeService, {
           _serviceBrand: undefined,
           onDidChange: () => ({ dispose: () => {} }),