dsh-guardian

Runtime dangerous-operation policy, canonical output redaction, and security-review workflow for DeepSeek Harness.

The v0.1.3 release is tested with DSH 0.1.0-rc.8 and 0.1.1-rc.1 while retaining the rc.6-compatible peer range. Prebuilt packages are distributed through GitHub Releases. The unscoped npm name is owned by another publisher, so this project is not published there.

简体中文

MVP

• A tools/pre-execute waterfall classifies dangerous shell, SQL, and structured file-write arguments as deny, ask, or unchanged.
• standard, strict, and permissive profiles provide different approval levels while retaining non-negotiable deny rules.
• Custom regular-expression rules add deployment-specific deny or ask decisions.
• A tools/post-execute waterfall redacts common credentials from canonical JSON results, failures, rendered text, and block feedback.
• Consecutive text blocks are scanned as one stream so splitting a credential across blocks does not bypass redaction.
• /security-review loads a bundled, read-only security-review skill.

The MVP is not a process sandbox, authorization system, data-loss-prevention service, or substitute for the provider policies mounted below it.

Policy behavior

The built-in rules deny recursive forced deletion of root or home paths, network-response pipes into shells, raw writes to /dev, and writes to /etc. Force pushes, destructive SQL, and other recursive forced deletions ask for approval. Strict mode additionally asks for sudo; permissive mode retains only deny rules.

Guardian always delegates through next(). When another policy listener returns a decision, the most restrictive result wins: deny outranks ask, which outranks allow.

Redaction behavior

Built-in patterns cover AWS access-key IDs, GitHub tokens, sk- API keys, PEM private-key blocks, and common credential assignments. Redaction is applied to the canonical JSON value when one exists, preserving arrays, objects, numbers, booleans, and null values. This prevents Code Mode and downstream renderers from retaining an unredacted value behind safe-looking display text.

Logs contain only the tool name, match count, and redaction labels. The plugin does not append custom session events because the current external plugin API does not expose an ignorable event envelope; emitting a required unknown event would make old sessions unreadable after uninstall.

Permissions and data

• Guardian inspects tool names, arguments, canonical results, and rendered output inside the current DSH process. It can deny a call or request approval but never executes the requested operation itself.
• Redaction replaces matched secret text before downstream model-visible consumers receive the canonical result. Logs retain only the tool name, match count, and non-secret labels.
• The plugin does not read credential stores, make network requests, write workspace files, transmit telemetry, or persist custom session events.

Install

The package supports DSH >=0.1.0-rc.6 <0.2.0 plugin APIs and Node.js ^22.19 || >=24.

dsh plugin --profile web add https://github.com/lonelymoon87/dsh-guardian/releases/download/v0.1.3/dsh-guardian-0.1.3.tgz

The release tarball is prebuilt and needs no build allowance. A pinned source install is also supported:

dsh plugin --profile web add github:lonelymoon87/dsh-guardian#v0.1.3

The source install runs this package's prepare build. pnpm 10 and later reject it until the profile allowlists the exact package key printed by the failed command; apply that instruction and rerun the same dsh plugin add command. Replace web with headless to install into the one-shot agent profile.

To upgrade, rerun dsh plugin add with the newer release URL. To uninstall:

dsh plugin --profile web remove dsh-guardian

Configuration

- id: guardian
  name: dsh-guardian
  config:
    profile: standard
    rules:
      - name: production-host
        pattern: production\\.internal
        action: ask
        reason: production target requires review
    redaction:
      enabled: true
      patterns:
        - label: internal-token
          pattern: INT_[A-Z0-9]{12}

Regular-expression flags may contain only i, m, s, and u. Invalid expressions and labels fail during plugin loading.

Verification

The tests cover positive and negative cases for every built-in rule, structured paths, profile behavior, downstream policy composition, nested canonical values, custom credentials, block feedback, split text blocks, disabled redaction, command dispatch, and invalid configuration.

• The v0.1.3 tarball installs directly from its HTTPS release URL into clean DSH 0.1.0-rc.8 and 0.1.1-rc.1 profiles.
• The packed bundle and pinned GitHub source install both appear in dsh --dump-config.
• CI covers Node 22.19 and Node 24; a compatibility matrix repeats the real install against DSH 0.1.0-rc.8 plus the latest and next npm tags.
• Bugs and compatibility reports are tracked in GitHub Issues.

License

MIT