working out the worker/execution interface
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work-summary/2025-02-05-FINAL-secure-parameters.md
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work-summary/2025-02-05-FINAL-secure-parameters.md
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# Secure Parameter Delivery - Final Implementation Summary
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**Date**: 2025-02-05
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**Status**: ✅ Complete
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**Type**: Security Enhancement + Architecture Improvement
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---
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## Executive Summary
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Implemented a **secure-by-design** parameter passing system for Attune actions that:
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1. **Eliminates security vulnerability** - Parameters never passed as environment variables
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2. **Separates concerns** - Action parameters vs execution environment variables
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3. **Secure by default** - stdin + JSON for all parameters
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4. **Simple choices** - Just two delivery methods: stdin (default) or file (large payloads)
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**Key Achievement**: It is now **impossible** to accidentally expose sensitive parameters in process listings.
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---
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## Problem Statement
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### Original Security Vulnerability
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Environment variables are visible to any user who can inspect running processes:
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- `ps aux` command
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- `/proc/<pid>/environ` file
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- System monitoring tools
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**Impact**: Passwords, API keys, and credentials were exposed in process listings when passed as environment variables.
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### Design Confusion
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The original approach mixed two concepts:
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- **Action Parameters** (data the action operates on)
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- **Environment Variables** (execution context/configuration)
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This led to unclear usage patterns and security risks.
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---
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## Solution Architecture
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### Core Design Principle
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**Parameters and Environment Variables Are Separate**:
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```
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┌─────────────────────────────────────────────────────────────┐
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│ EXECUTION │
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├─────────────────────────────────────────────────────────────┤
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│ │
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│ ┌──────────────────────┐ ┌──────────────────────┐ │
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│ │ PARAMETERS │ │ ENV VARS │ │
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│ │ (action data) │ │ (execution context) │ │
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│ ├──────────────────────┤ ├──────────────────────┤ │
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│ │ • Always secure │ │ • Set as env vars │ │
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│ │ • stdin or file │ │ • From env_vars JSON │ │
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│ │ • Never in env │ │ • Non-sensitive │ │
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│ │ • API payloads │ │ • Configuration │ │
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│ │ • Credentials │ │ • Feature flags │ │
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│ │ • Business data │ │ • Context metadata │ │
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│ └──────────────────────┘ └──────────────────────┘ │
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│ ▼ ▼ │
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│ Via stdin/file Set in process env │
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└─────────────────────────────────────────────────────────────┘
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```
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### Parameter Delivery Methods
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**Only Two Options** (env removed entirely):
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1. **stdin** (DEFAULT)
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- Secure, not visible in process listings
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- Good for most actions
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- Supports JSON, dotenv, YAML formats
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2. **file**
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- Secure temporary file (mode 0400)
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- Good for large payloads (>1MB)
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- Automatic cleanup after execution
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### Environment Variables (Separate)
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- Stored in `execution.env_vars` (JSONB in database)
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- Set as environment variables by worker
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- Used for execution context, not sensitive data
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- Examples: `ATTUNE_EXECUTION_ID`, custom config values
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---
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## Implementation Details
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### 1. Database Schema
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**Migration 1**: `20250205000001_action_parameter_delivery.sql`
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```sql
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ALTER TABLE action
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ADD COLUMN parameter_delivery TEXT NOT NULL DEFAULT 'stdin'
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CHECK (parameter_delivery IN ('stdin', 'file'));
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ALTER TABLE action
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ADD COLUMN parameter_format TEXT NOT NULL DEFAULT 'json'
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CHECK (parameter_format IN ('dotenv', 'json', 'yaml'));
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```
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**Migration 2**: `20250205000002_execution_env_vars.sql`
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```sql
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ALTER TABLE execution
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ADD COLUMN env_vars JSONB;
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CREATE INDEX idx_execution_env_vars_gin ON execution USING GIN (env_vars);
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```
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### 2. Data Models
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**ParameterDelivery Enum** (crates/common/src/models.rs):
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```rust
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pub enum ParameterDelivery {
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Stdin, // Standard input (DEFAULT)
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File, // Temporary file
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// NO Env option - removed for security
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}
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impl Default for ParameterDelivery {
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fn default() -> Self {
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Self::Stdin
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}
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}
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```
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**ParameterFormat Enum**:
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```rust
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pub enum ParameterFormat {
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Json, // JSON object (DEFAULT)
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Dotenv, // KEY='VALUE' format
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Yaml, // YAML document
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}
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impl Default for ParameterFormat {
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fn default() -> Self {
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Self::Json
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}
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}
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```
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**Action Model** (updated):
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```rust
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pub struct Action {
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// ... existing fields
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pub parameter_delivery: ParameterDelivery,
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pub parameter_format: ParameterFormat,
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}
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```
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**Execution Model** (updated):
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```rust
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pub struct Execution {
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// ... existing fields
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pub env_vars: Option<JsonDict>, // NEW: separate from parameters
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}
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```
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### 3. Parameter Passing Module
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**File**: `crates/worker/src/runtime/parameter_passing.rs` (NEW, 384 lines)
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**Key Functions**:
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- `format_parameters()` - Serializes parameters in specified format
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- `format_json()`, `format_dotenv()`, `format_yaml()` - Format converters
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- `create_parameter_file()` - Creates secure temp file (mode 0400)
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- `prepare_parameters()` - Main entry point for parameter preparation
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**PreparedParameters Enum**:
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```rust
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pub enum PreparedParameters {
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Stdin(String), // Parameters as formatted string for stdin
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File { // Parameters in temporary file
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path: PathBuf,
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temp_file: NamedTempFile,
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},
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}
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```
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**Security Features**:
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- Temporary files created with restrictive permissions (0400 on Unix)
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- Automatic cleanup of temporary files
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- Delimiter separation (`---ATTUNE_PARAMS_END---`) for parameters and secrets
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### 4. Runtime Integration
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**Shell Runtime** (crates/worker/src/runtime/shell.rs):
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```rust
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async fn execute(&self, context: ExecutionContext) -> RuntimeResult<ExecutionResult> {
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// Prepare parameters according to delivery method
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let mut env = context.env.clone();
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let config = ParameterDeliveryConfig {
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delivery: context.parameter_delivery,
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format: context.parameter_format,
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};
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let prepared_params = parameter_passing::prepare_parameters(
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&context.parameters,
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&mut env,
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config,
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)?;
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// Get stdin content if using stdin delivery
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let parameters_stdin = prepared_params.stdin_content();
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// Execute with parameters via stdin or file
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self.execute_shell_file(
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code_path,
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&context.secrets,
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&env,
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parameters_stdin,
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// ... other args
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).await
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}
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```
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**Native Runtime** (crates/worker/src/runtime/native.rs):
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- Similar updates to support stdin and file parameter delivery
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- Writes parameters to stdin before secrets
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- All test contexts updated with new required fields
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### 5. Pack Loader
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**File**: `scripts/load_core_pack.py` (updated)
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```python
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# Parameter delivery and format (defaults: stdin + json for security)
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parameter_delivery = action_data.get("parameter_delivery", "stdin").lower()
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parameter_format = action_data.get("parameter_format", "json").lower()
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# Validate parameter delivery method (only stdin and file allowed)
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if parameter_delivery not in ["stdin", "file"]:
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print(f" ⚠ Invalid parameter_delivery '{parameter_delivery}', defaulting to 'stdin'")
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parameter_delivery = "stdin"
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```
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---
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## Configuration
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### Action YAML Syntax
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```yaml
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name: my_action
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ref: mypack.my_action
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description: "Secure action with credential handling"
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runner_type: python
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entry_point: my_action.py
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# Parameter delivery (optional - these are the defaults)
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# parameter_delivery: stdin # Options: stdin, file (default: stdin)
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# parameter_format: json # Options: json, dotenv, yaml (default: json)
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parameters:
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type: object
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properties:
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api_key:
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type: string
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secret: true # Mark sensitive parameters
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```
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### Execution Configuration
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When creating an execution, parameters and environment variables are separate:
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```json
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{
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"action_ref": "mypack.my_action",
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"parameters": {
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"api_key": "secret123",
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"data": {"foo": "bar"}
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},
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"env_vars": {
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"LOG_LEVEL": "debug",
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"FEATURE_FLAG": "enabled"
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}
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}
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```
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**Result**:
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- `api_key` and `data` passed via stdin (secure, not visible in `ps`)
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- `LOG_LEVEL` and `FEATURE_FLAG` set as environment variables
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---
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## Code Examples
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### Python Action (Default stdin + json)
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**Action YAML**:
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```yaml
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name: secure_action
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ref: mypack.secure_action
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runner_type: python
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entry_point: secure_action.py
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# Uses default stdin + json (no need to specify)
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```
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**Action Script**:
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```python
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#!/usr/bin/env python3
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import sys
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import json
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import os
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def read_stdin_params():
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"""Read parameters from stdin."""
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content = sys.stdin.read()
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parts = content.split('---ATTUNE_PARAMS_END---')
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params = json.loads(parts[0].strip()) if parts[0].strip() else {}
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secrets = json.loads(parts[1].strip()) if len(parts) > 1 and parts[1].strip() else {}
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return {**params, **secrets}
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def main():
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# Read parameters (secure)
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params = read_stdin_params()
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api_key = params.get('api_key') # Not in process list!
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# Read environment variables (context)
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log_level = os.environ.get('LOG_LEVEL', 'info')
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# Use parameters and env vars...
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print(json.dumps({"success": True}))
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if __name__ == "__main__":
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main()
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```
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### Shell Action (stdin + dotenv format)
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**Action YAML**:
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```yaml
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name: shell_script
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ref: mypack.shell_script
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runner_type: shell
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entry_point: script.sh
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parameter_delivery: stdin
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parameter_format: dotenv
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```
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**Action Script**:
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```bash
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#!/bin/bash
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set -e
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# Read dotenv from stdin
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eval "$(cat)"
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# Use parameters (from stdin)
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echo "Message: $MESSAGE"
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# Use environment variables (from execution context)
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echo "Log Level: $LOG_LEVEL"
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```
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### File-Based Delivery (Large Payloads)
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**Action YAML**:
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```yaml
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name: large_config
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ref: mypack.large_config
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runner_type: python
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entry_point: process.py
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parameter_delivery: file
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parameter_format: yaml
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```
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**Action Script**:
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```python
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#!/usr/bin/env python3
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import os
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import yaml
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# Read from parameter file
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param_file = os.environ['ATTUNE_PARAMETER_FILE']
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with open(param_file, 'r') as f:
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params = yaml.safe_load(f)
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# File has mode 0400 - only owner can read
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# File automatically deleted after execution
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```
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|
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---
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|
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## Security Improvements
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|
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### Before This Implementation
|
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|
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```bash
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# Parameters visible to anyone with ps access
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$ ps aux | grep attune-worker
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... ATTUNE_ACTION_DB_PASSWORD=secret123 ...
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```
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|
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**Risk**: Credentials exposed in process listings
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|
||||
### After This Implementation
|
||||
|
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```bash
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# Parameters NOT visible in process list
|
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$ ps aux | grep attune-worker
|
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... ATTUNE_PARAMETER_DELIVERY=stdin ATTUNE_PARAMETER_FORMAT=json ...
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```
|
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|
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**Security**: Parameters delivered securely via stdin or temporary files
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|
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### Security Guarantees
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|
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1. **Parameters Never in Environment** - No option to pass as env vars
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2. **Stdin Not Visible** - Not exposed in process listings
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3. **File Permissions** - Temporary files mode 0400 (owner read-only)
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4. **Automatic Cleanup** - Temp files deleted after execution
|
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5. **Separation of Concerns** - Parameters vs env vars clearly separated
|
||||
|
||||
---
|
||||
|
||||
## Breaking Changes
|
||||
|
||||
### What Changed
|
||||
|
||||
1. **Removed `env` delivery option** - Parameters can no longer be passed as environment variables
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2. **Added `execution.env_vars`** - Separate field for environment variables
|
||||
3. **Defaults changed** - stdin + json (was env + dotenv)
|
||||
|
||||
### Justification
|
||||
|
||||
Per `AGENTS.md`: "Breaking changes are explicitly allowed and encouraged when they improve the architecture, API design, or developer experience. This project is under active development with no users, deployments, or stable releases."
|
||||
|
||||
**Why This Is Better**:
|
||||
- **Secure by design** - Impossible to accidentally expose parameters
|
||||
- **Clear separation** - Parameters (data) vs env vars (context)
|
||||
- **Simpler choices** - Only 2 delivery methods instead of 3
|
||||
- **Better defaults** - Secure by default (stdin + json)
|
||||
|
||||
---
|
||||
|
||||
## Documentation
|
||||
|
||||
### Created
|
||||
|
||||
- `docs/actions/parameter-delivery.md` (568 lines) - Complete guide
|
||||
- `docs/actions/QUICKREF-parameter-delivery.md` (365 lines) - Quick reference
|
||||
- `docs/actions/README.md` (163 lines) - Directory overview
|
||||
|
||||
### Updated
|
||||
|
||||
- `docs/packs/pack-structure.md` - Parameter delivery examples
|
||||
- `work-summary/2025-02-05-secure-parameter-delivery.md` (542 lines)
|
||||
- `work-summary/changelogs/CHANGELOG.md` - Feature entry
|
||||
|
||||
---
|
||||
|
||||
## Testing
|
||||
|
||||
### Unit Tests
|
||||
|
||||
Added comprehensive tests in `parameter_passing.rs`:
|
||||
- ✅ `test_format_dotenv()` - Dotenv formatting with escaping
|
||||
- ✅ `test_format_json()` - JSON serialization
|
||||
- ✅ `test_format_yaml()` - YAML serialization
|
||||
- ✅ `test_create_parameter_file()` - Temp file creation
|
||||
- ✅ `test_prepare_parameters_stdin()` - Stdin delivery
|
||||
- ✅ `test_prepare_parameters_file()` - File delivery
|
||||
|
||||
### Integration Testing
|
||||
|
||||
All runtime tests updated:
|
||||
- Shell runtime tests - All ExecutionContext structures updated
|
||||
- Native runtime tests - Use test_context helper (already updated)
|
||||
- All tests pass with new required fields
|
||||
|
||||
---
|
||||
|
||||
## Migration Guide
|
||||
|
||||
### For New Actions
|
||||
|
||||
**No changes needed!** - Defaults are secure:
|
||||
```yaml
|
||||
# This is all you need (or omit - it's the default)
|
||||
parameter_delivery: stdin
|
||||
parameter_format: json
|
||||
```
|
||||
|
||||
Write action to read from stdin:
|
||||
```python
|
||||
import sys, json
|
||||
content = sys.stdin.read()
|
||||
params = json.loads(content.split('---ATTUNE_PARAMS_END---')[0])
|
||||
```
|
||||
|
||||
### For Execution Context
|
||||
|
||||
**Use env_vars for non-sensitive context**:
|
||||
```json
|
||||
{
|
||||
"action_ref": "mypack.action",
|
||||
"parameters": {"data": "value"},
|
||||
"env_vars": {"LOG_LEVEL": "debug"}
|
||||
}
|
||||
```
|
||||
|
||||
Read in action:
|
||||
```python
|
||||
import os
|
||||
log_level = os.environ.get('LOG_LEVEL', 'info')
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Environment Variables Reference
|
||||
|
||||
### System Variables (Always Set)
|
||||
|
||||
- `ATTUNE_EXECUTION_ID` - Current execution ID
|
||||
- `ATTUNE_ACTION_REF` - Action reference (e.g., "mypack.action")
|
||||
- `ATTUNE_PARAMETER_DELIVERY` - Method used (stdin/file)
|
||||
- `ATTUNE_PARAMETER_FORMAT` - Format used (json/dotenv/yaml)
|
||||
- `ATTUNE_PARAMETER_FILE` - File path (only for file delivery)
|
||||
|
||||
### Custom Variables (From execution.env_vars)
|
||||
|
||||
Any key-value pairs in `execution.env_vars` are set as environment variables:
|
||||
|
||||
```json
|
||||
{
|
||||
"env_vars": {
|
||||
"LOG_LEVEL": "debug",
|
||||
"RETRY_COUNT": "3",
|
||||
"FEATURE_ENABLED": "true"
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
Action receives:
|
||||
```bash
|
||||
LOG_LEVEL=debug
|
||||
RETRY_COUNT=3
|
||||
FEATURE_ENABLED=true
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Performance Impact
|
||||
|
||||
### Minimal Overhead
|
||||
|
||||
- **stdin delivery**: Negligible (milliseconds for JSON/YAML parsing)
|
||||
- **file delivery**: Slight overhead for I/O, beneficial for large payloads
|
||||
- **Memory usage**: Unchanged (parameters were already in memory)
|
||||
|
||||
### Resource Cleanup
|
||||
|
||||
- Temporary files automatically deleted after execution
|
||||
- No resource leaks
|
||||
- GIN index on env_vars for efficient querying
|
||||
|
||||
---
|
||||
|
||||
## Compliance & Security Standards
|
||||
|
||||
### Standards Addressed
|
||||
|
||||
- ✅ **OWASP** - "Sensitive Data Exposure" vulnerability eliminated
|
||||
- ✅ **CWE-214** - Information Exposure Through Process Environment (fixed)
|
||||
- ✅ **PCI DSS Requirement 3** - Protect stored cardholder data
|
||||
- ✅ **Principle of Least Privilege** - Parameters not visible to other processes
|
||||
|
||||
### Security Posture Improvements
|
||||
|
||||
1. **Defense in Depth** - Multiple layers prevent exposure
|
||||
2. **Secure by Default** - No insecure options available
|
||||
3. **Fail-Safe Defaults** - Default to most secure option
|
||||
4. **Clear Separation** - Sensitive data vs configuration clearly separated
|
||||
|
||||
---
|
||||
|
||||
## Best Practices for Developers
|
||||
|
||||
### ✅ Do This
|
||||
|
||||
1. **Use default stdin + json** for most actions
|
||||
2. **Mark sensitive parameters** with `secret: true`
|
||||
3. **Use execution.env_vars** for execution context
|
||||
4. **Test parameters not in `ps aux`** output
|
||||
5. **Never log sensitive parameters**
|
||||
|
||||
### ❌ Don't Do This
|
||||
|
||||
1. Don't put sensitive data in `execution.env_vars` - use parameters
|
||||
2. Don't log full parameter objects (may contain secrets)
|
||||
3. Don't confuse parameters with environment variables
|
||||
4. Don't try to read parameters from environment (they're not there!)
|
||||
|
||||
---
|
||||
|
||||
## Future Enhancements
|
||||
|
||||
### Potential Improvements
|
||||
|
||||
1. **Encrypted Parameter Files** - Encrypt temp files for additional security
|
||||
2. **Parameter Validation** - Validate against schema before delivery
|
||||
3. **Audit Logging** - Log parameter access for compliance
|
||||
4. **Per-Parameter Delivery** - Different methods for different parameters
|
||||
5. **Memory-Only Delivery** - Pass via shared memory (no disk I/O)
|
||||
|
||||
---
|
||||
|
||||
## Related Files
|
||||
|
||||
### New Files
|
||||
- `migrations/20250205000001_action_parameter_delivery.sql`
|
||||
- `migrations/20250205000002_execution_env_vars.sql`
|
||||
- `crates/worker/src/runtime/parameter_passing.rs`
|
||||
- `docs/actions/parameter-delivery.md`
|
||||
- `docs/actions/QUICKREF-parameter-delivery.md`
|
||||
- `docs/actions/README.md`
|
||||
- `work-summary/2025-02-05-secure-parameter-delivery.md`
|
||||
- `work-summary/2025-02-05-FINAL-secure-parameters.md` (this file)
|
||||
|
||||
### Modified Files
|
||||
- `crates/common/src/models.rs` (ParameterDelivery, ParameterFormat enums, Execution model)
|
||||
- `crates/worker/src/runtime/mod.rs` (ExecutionContext, exports)
|
||||
- `crates/worker/src/runtime/shell.rs` (parameter passing integration)
|
||||
- `crates/worker/src/runtime/native.rs` (parameter passing integration)
|
||||
- `crates/worker/src/executor.rs` (prepare_execution_context)
|
||||
- `crates/worker/Cargo.toml` (dependencies)
|
||||
- `scripts/load_core_pack.py` (parameter delivery validation)
|
||||
- `packs/core/actions/*.yaml` (updated to use defaults)
|
||||
- `docs/packs/pack-structure.md` (examples and documentation)
|
||||
- `work-summary/changelogs/CHANGELOG.md` (feature entry)
|
||||
|
||||
---
|
||||
|
||||
## Conclusion
|
||||
|
||||
This implementation provides **secure-by-design** parameter passing for Attune actions:
|
||||
|
||||
### Key Achievements
|
||||
|
||||
1. ✅ **Eliminated security vulnerability** - Parameters never in process listings
|
||||
2. ✅ **Clear separation of concerns** - Parameters vs environment variables
|
||||
3. ✅ **Secure by default** - stdin + json for all actions
|
||||
4. ✅ **Impossible to misconfigure** - No insecure options available
|
||||
5. ✅ **Simple to use** - Just read from stdin (default)
|
||||
6. ✅ **Comprehensive documentation** - 1100+ lines of docs
|
||||
7. ✅ **Full test coverage** - Unit and integration tests
|
||||
8. ✅ **Zero compilation warnings** - Clean build
|
||||
|
||||
### Impact
|
||||
|
||||
**Before**: Credentials could be accidentally exposed via environment variables
|
||||
**After**: Parameters are secure by design - no way to expose them accidentally
|
||||
|
||||
This provides a strong security foundation for the Attune platform from day one, eliminating an entire class of security vulnerabilities before they can affect any production deployments.
|
||||
|
||||
---
|
||||
|
||||
**Implementation Date**: 2025-02-05
|
||||
**Status**: ✅ Complete and Ready for Use
|
||||
**Build Status**: ✅ All packages compile successfully
|
||||
**Test Status**: ✅ All tests pass
|
||||
**Documentation**: ✅ Comprehensive (1100+ lines)
|
||||
Reference in New Issue
Block a user