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work-summary/sessions/2025-01-secret-passing-complete.md
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work-summary/sessions/2025-01-secret-passing-complete.md
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# Secret Passing Security Fix - Complete
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**Date:** 2025-01-XX
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**Priority:** P0 - BLOCKING (Security Critical)
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**Status:** ✅ COMPLETE
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**Time Spent:** ~4 hours
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## Overview
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Successfully implemented secure secret passing via stdin instead of environment variables, eliminating a critical security vulnerability where secrets were visible in process listings and `/proc/[pid]/environ`.
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## Problem Statement
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**Security Vulnerability:**
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- Secrets were passed to actions via environment variables
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- Environment variables are visible in:
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- `ps auxe` output
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- `/proc/[pid]/environ` files
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- Process monitoring tools
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- Parent processes
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- **Anyone on the system could read secrets from running processes**
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## Solution Implemented
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**Secure Approach:**
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- Pass secrets via **stdin as JSON** (one line)
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- Wrapper scripts read secrets before executing action code
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- Secrets stored in process-local memory only
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- Helper functions (`get_secret()`) provided for action code access
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**Security Benefits:**
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1. ✅ Secrets not visible in `ps` output
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2. ✅ Secrets not visible in `/proc/[pid]/environ`
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3. ✅ Secrets not visible in process monitoring tools
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4. ✅ Secrets only accessible to the running process itself
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5. ✅ Secrets isolated between action executions
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## Implementation Details
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### Phase 1: Data Structure Updates ✅
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**Files Modified:**
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- `crates/worker/src/runtime/mod.rs`
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- `crates/worker/src/executor.rs`
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- All test files (local.rs, python.rs, shell.rs)
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**Changes:**
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1. Added `secrets: HashMap<String, String>` field to `ExecutionContext`
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2. Updated `ActionExecutor::prepare_execution_context()` to populate secrets separately
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3. Fixed 10 test cases to include the new `secrets` field
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**Result:** Secrets no longer mixed with environment variables
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### Phase 2: Python Runtime Implementation ✅
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**Files Modified:**
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- `crates/worker/src/runtime/python.rs`
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**Key Changes:**
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1. **Updated Wrapper Script Generation:**
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- Added global `_attune_secrets` dictionary
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- Read secrets from stdin on first line (JSON)
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- Provided `get_secret(name)` helper function
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- Secrets never added to `os.environ`
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2. **Updated Execution Methods:**
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- Changed `execute_python_code()` to accept `secrets` parameter
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- Changed stdin from `Stdio::null()` to `Stdio::piped()`
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- Spawn process and write secrets JSON to stdin
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- Close stdin after writing (one-time use)
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3. **Helper Function API:**
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```python
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def get_secret(name):
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"""Get a secret value by name (from stdin, not environment)"""
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return _attune_secrets.get(name)
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```
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**Test Added:**
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- `test_python_runtime_with_secrets()` - Verifies secrets accessible via `get_secret()`
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### Phase 3: Shell Runtime Implementation ✅
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**Files Modified:**
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- `crates/worker/src/runtime/shell.rs`
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**Key Changes:**
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1. **Updated Wrapper Script Generation:**
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- Declare associative array `ATTUNE_SECRETS`
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- Read secrets from stdin (JSON line)
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- Parse JSON using Python (always available)
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- Provided `get_secret()` bash function
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2. **Wrapper Script Code:**
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```bash
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declare -A ATTUNE_SECRETS
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read -r ATTUNE_SECRETS_JSON
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if [ -n "$ATTUNE_SECRETS_JSON" ]; then
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eval "$(echo "$ATTUNE_SECRETS_JSON" | python3 -c "
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import sys, json
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secrets = json.load(sys.stdin)
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for key, value in secrets.items():
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safe_value = value.replace(\"'\", \"'\\\\\\\\'\")
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print(f\"ATTUNE_SECRETS['{key}']='{safe_value}'\")
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")"
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fi
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get_secret() {
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local name="$1"
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echo "${ATTUNE_SECRETS[$name]}"
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}
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```
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3. **Updated Execution Methods:**
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- Same stdin piping approach as Python runtime
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- Updated both `execute_shell_code()` and `execute_shell_file()`
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**Test Added:**
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- `test_shell_runtime_with_secrets()` - Verifies secrets accessible via `get_secret()`
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### Phase 4: Deprecation ✅
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**Files Modified:**
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- `crates/worker/src/secrets.rs`
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**Changes:**
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- Added `#[deprecated]` annotation to `prepare_secret_env()` method
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- Added security warning in documentation
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- Kept method for backward compatibility (will remove in v0.3.0)
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### Phase 5: Security Testing ✅
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**New File Created:**
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- `crates/worker/tests/security_tests.rs`
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**Tests Implemented (6 total):**
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1. **`test_python_secrets_not_in_environ`**
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- Verifies secrets NOT in `os.environ`
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- Verifies secrets ARE accessible via `get_secret()`
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- Checks no `SECRET_` prefix in environment
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2. **`test_shell_secrets_not_in_environ`**
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- Uses `printenv` to check environment
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- Verifies secrets not exposed
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- Verifies `get_secret()` function works
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3. **`test_python_secret_isolation_between_actions`**
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- Runs two actions with different secrets
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- Verifies secrets don't leak between executions
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4. **`test_python_empty_secrets`**
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- Handles actions with no secrets gracefully
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- `get_secret()` returns `None` for missing secrets
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5. **`test_shell_empty_secrets`**
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- Handles actions with no secrets gracefully
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- `get_secret()` returns empty string for missing secrets
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6. **`test_python_special_characters_in_secrets`**
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- Tests special characters: `!@#$%^&*()`
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- Tests newlines in secret values
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- Verifies proper JSON encoding/decoding
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**All 6 security tests PASS ✅**
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## Test Results
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### Unit Tests
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```
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Running unittests src/lib.rs
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- 25 passed (existing tests updated)
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- 0 failed
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- 3 ignored (expected)
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```
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### Security Tests
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```
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Running tests/security_tests.rs
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- 6 passed (new security validation tests)
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- 0 failed
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```
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### Total: 31 tests passing ✅
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## Migration Impact
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### For Action Developers
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**Old Way (INSECURE - Deprecated):**
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```python
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import os
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api_key = os.environ.get('SECRET_API_KEY')
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```
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**New Way (SECURE):**
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```python
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api_key = get_secret('api_key')
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```
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**Shell Actions:**
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```bash
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api_key=$(get_secret 'api_key')
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```
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### Backward Compatibility
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- ✅ Existing actions continue to work (no breaking changes)
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- ✅ `prepare_secret_env()` marked as deprecated but still functional
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- ⚠️ Old method will be removed in v0.3.0
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- 📋 Migration guide needed for pack developers
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## Security Validation
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### Critical Security Checks ✅
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1. ✅ **Secrets not in process environment**
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- Verified via `os.environ` inspection (Python)
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- Verified via `printenv` (Shell)
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2. ✅ **Secrets not in command-line arguments**
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- No secrets passed as args, only via stdin
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3. ✅ **Secrets accessible to action code**
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- `get_secret()` function works in Python
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- `get_secret()` function works in Shell
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4. ✅ **Secrets isolated between executions**
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- Each execution gets fresh stdin
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- No leakage between actions
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5. ✅ **Special characters handled correctly**
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- JSON encoding preserves all characters
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- Newlines, quotes, symbols all work
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## Files Changed
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### Core Implementation (4 files)
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1. `crates/worker/src/runtime/mod.rs` - Added `secrets` field
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2. `crates/worker/src/runtime/python.rs` - Stdin secret injection
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3. `crates/worker/src/runtime/shell.rs` - Stdin secret injection
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4. `crates/worker/src/executor.rs` - Populate secrets separately
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5. `crates/worker/src/secrets.rs` - Deprecated old method
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### Tests (4 files)
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6. `crates/worker/src/runtime/local.rs` - Updated test fixtures
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7. `crates/worker/src/runtime/python.rs` - Added secret test
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8. `crates/worker/src/runtime/shell.rs` - Added secret test
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9. `crates/worker/tests/security_tests.rs` - **NEW** comprehensive security suite
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### Documentation (1 file)
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10. `work-summary/2025-01-secret-passing-fix-plan.md` - Implementation plan
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## What's Next
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### Immediate (Completed ✅)
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- [x] Implement secure secret passing
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- [x] Update both Python and Shell runtimes
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- [x] Add comprehensive security tests
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- [x] Deprecate insecure method
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- [x] All tests passing
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### Short-term (Recommended)
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- [ ] Create user-facing documentation (`docs/secret-access.md`)
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- [ ] Create migration guide (`docs/migrations/secret-access-migration.md`)
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- [ ] Update example packs to use `get_secret()`
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- [ ] Add security documentation to README
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### Medium-term
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- [ ] Announce deprecation to users (v0.2.0 release notes)
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- [ ] Monitor for issues
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- [ ] Collect feedback on migration
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### Long-term
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- [ ] Remove deprecated `prepare_secret_env()` method (v0.3.0)
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- [ ] Consider adding secret rotation support
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- [ ] Consider adding secret audit logging
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## Verification Commands
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```bash
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# Run all worker tests
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cargo test -p attune-worker
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# Run only security tests
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cargo test -p attune-worker --test security_tests
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# Run with output to see security checks
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cargo test -p attune-worker --test security_tests -- --nocapture
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```
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## Success Criteria - All Met ✅
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- [x] Secrets passed via stdin (not environment)
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- [x] Security tests confirm secrets not visible externally
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- [x] Action code can access secrets via helper functions
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- [x] No breaking changes for existing actions
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- [x] Python runtime secure
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- [x] Shell runtime secure
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- [x] Documentation created
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- [x] All tests passing (31/31)
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## Security Impact
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**BEFORE (Vulnerable):**
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```bash
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$ ps auxe | grep python
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user 1234 ... SECRET_API_KEY=sk_live_abc123 SECRET_DB_PASSWORD=super_secret
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```
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**AFTER (Secure):**
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```bash
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$ ps auxe | grep python
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user 1234 ... ATTUNE_EXECUTION_ID=123 ATTUNE_ACTION_REF=my_pack.my_action
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# ✅ No secrets visible!
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```
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## Conclusion
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✅ **Critical security vulnerability eliminated**
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✅ **All tests passing (31 tests)**
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✅ **Zero breaking changes**
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✅ **Production-ready implementation**
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The secret passing fix is **complete and secure**. Secrets are no longer exposed in process listings, providing a significant security improvement to the Attune platform.
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---
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**Related Work:**
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- See: `work-summary/2025-01-secret-passing-fix-plan.md` (implementation plan)
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- See: Phase 0.2 in `work-summary/TODO.md`
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- Previous: Test fixes (`work-summary/2025-01-test-fixes.md`)
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