# Security Audit Checklist for nu_plugin_secret
This checklist helps security teams, developers, and auditors verify the secure implementation and usage of the `nu_plugin_secret` plugin.
## 🎯 Audit Overview
### Scope of Security Review
- [x] **Secret Type Implementation**: All 8 secret types (String, Int, Bool, Float, Record, List, Binary, Date)
- [x] **Memory Safety**: Secure cleanup and no information leakage
- [x] **Display Protection**: No accidental exposure through display/debug
- [x] **Serialization Security**: Protection against JSON/YAML/binary exposure
- [x] **Plugin Integration**: Secure Nushell plugin architecture
- [x] **Error Handling**: Security-conscious error messages
- [x] **Testing Coverage**: Comprehensive security test suite
## 🔍 Code-Level Security Audit
### 1. Memory Safety Verification
#### ✅ Drop Implementation Audit
**Location**: `src/secret_*.rs` files
**Check**: All secret types implement secure memory cleanup
```rust
// Verify each secret type has Drop implementation
impl Drop for SecretString {
fn drop(&mut self) {
self.inner.zeroize(); // ✅ Must use zeroize
}
}
impl Drop for SecretInt {
fn drop(&mut self) {
self.inner.zeroize(); // ✅ Must zero memory
}
}
// ... verify for all 8 types
```
**Audit Points:**
- [ ] All secret types implement `Drop` trait
- [ ] All use `zeroize()` or equivalent secure cleanup
- [ ] No plain `Default::default()` or simple assignment
- [ ] Memory zeroing occurs before deallocation
#### ✅ Zeroize Integration
**Location**: `Cargo.toml` and imports
**Check**: Proper zeroize dependency and usage
```toml
[dependencies]
zeroize = "1.5" # ✅ Check version is current
```
**Audit Points:**
- [ ] Zeroize crate is properly declared as dependency
- [ ] All secret types derive or implement `ZeroizeOnDrop`
- [ ] No custom memory management that bypasses zeroize
- [ ] Test coverage for memory cleanup (see test files)
### 2. Display Protection Audit
#### ✅ Display Trait Implementation
**Location**: Each `src/secret_*.rs` file
**Check**: All display implementations are secure
```rust
impl std::fmt::Display for SecretString {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "<redacted:string>") // ✅ Never shows content
}
}
impl std::fmt::Debug for SecretString {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "SecretString(<redacted>)") // ✅ Never shows content
}
}
```
**Audit Points:**
- [ ] All secret types implement `Display` trait securely
- [ ] All secret types implement `Debug` trait securely
- [ ] No actual content is ever displayed in any format
- [ ] Consistent redaction format across all types
- [ ] Error messages never expose secret content
#### ✅ CustomValue Display Protection
**Location**: Each secret type's `CustomValue` implementation
**Check**: `to_base_value` method never exposes content
```rust
impl CustomValue for SecretString {
fn to_base_value(&self, span: Span) -> Result<Value, ShellError> {
Ok(Value::string("<redacted:string>", span)) // ✅ Always redacted
}
}
```
**Audit Points:**
- [ ] `to_base_value` always returns redacted representation
- [ ] Type information is preserved in redaction
- [ ] No code paths that return actual content
- [ ] Consistent across all 8 secret types
### 3. Serialization Protection Audit
#### ✅ Serde Implementation Security
**Location**: Each `src/secret_*.rs` file
**Check**: Serialization implementations are secure
```rust
// Verify secure serialization
impl Serialize for SecretString {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where S: Serializer {
// ✅ Must NOT serialize actual content
serializer.serialize_str("<redacted:string>")
}
}
```
**Audit Points:**
- [ ] All secret types implement secure `Serialize`
- [ ] No actual content is serialized in any format
- [ ] `Deserialize` implementation (if present) is secure
- [ ] Works correctly with bincode for plugin communication
- [ ] JSON/YAML/TOML serialization shows redacted content only
#### ✅ Plugin Communication Security
**Location**: Plugin command implementations
**Check**: Inter-process communication is secure
**Audit Points:**
- [ ] Plugin communication uses bincode correctly
- [ ] Secret types survive plugin communication boundaries
- [ ] No plain text secrets in plugin protocol
- [ ] Error handling in plugin communication is secure
### 4. Command Implementation Security
#### ✅ Unwrap Command Security
**Location**: `src/commands/unwrap.rs`
**Check**: Unwrap operation is properly secured
```rust
pub fn run(&self, input: PipelineData) -> Result<PipelineData, ShellError> {
// ✅ Must log security warning
eprintln!("⚠️ WARNING: Unwrapping secret value exposes sensitive data");
// ✅ Must validate input is secret type
// ✅ Must extract content securely
}
```
**Audit Points:**
- [ ] Warning message is displayed on unwrap
- [ ] Input validation ensures only secret types are unwrapped
- [ ] Type-aware unwrapping (returns original Nushell type)
- [ ] No accidental double-unwrapping or type confusion
- [ ] Error messages don't leak content
#### ✅ Wrap Commands Security
**Location**: `src/commands/wrap_*.rs`
**Check**: All wrap commands create secure types
**Audit Points:**
- [ ] Each wrap command validates input type correctly
- [ ] Immediate protection of input value
- [ ] No temporary exposure during wrapping process
- [ ] Error handling doesn't expose input value
- [ ] All 8 wrap commands follow same security pattern
#### ✅ Utility Commands Security
**Location**: `src/commands/info.rs`, `src/commands/validate.rs`, `src/commands/type_of.rs`
**Check**: Utility commands don't leak information
**Audit Points:**
- [ ] `validate` command only returns boolean (no content)
- [ ] `type-of` command only returns type name (no content)
- [ ] `info` command shows no sensitive plugin information
- [ ] All utility operations are constant-time where possible
### 5. Error Handling Security Audit
#### ✅ Error Message Content
**Location**: All command files and error handling
**Check**: Error messages never expose secrets
```rust
// ✅ Good error message
Err(ShellError::TypeMismatch {
err_message: "Expected secret type".to_string(),
span: call.head,
})
// ❌ Bad error message (don't do this)
Err(ShellError::GenericError(
format!("Failed to process secret: {}", secret_content) // Never do this!
))
```
**Audit Points:**
- [ ] No error messages contain actual secret content
- [ ] Error messages are informative but secure
- [ ] Stack traces don't expose secret values
- [ ] Debug information is sanitized
- [ ] Panic handling doesn't leak secrets
### 6. Type System Integration Security
#### ✅ CustomValue Trait Implementation
**Location**: Each secret type's `CustomValue` impl
**Check**: All trait methods are implemented securely
```rust
impl CustomValue for SecretString {
fn type_name(&self) -> String {
"secret_string".into() // ✅ Safe type identifier
}
fn to_base_value(&self, span: Span) -> Result<Value, ShellError> {
Ok(Value::string("<redacted:string>", span)) // ✅ Always redacted
}
fn clone_value(&self) -> Box<dyn CustomValue> {
Box::new(self.clone()) // ✅ Safe cloning
}
}
```
**Audit Points:**
- [ ] `type_name()` returns consistent, safe identifier
- [ ] `to_base_value()` never exposes content
- [ ] `clone_value()` performs secure cloning
- [ ] All methods handle edge cases securely
- [ ] Integration with Nushell type system is secure
## 🧪 Testing Security Verification
### 1. Test Coverage Analysis
#### ✅ Security Test Verification
**Location**: `tests/` directory
**Check**: Comprehensive security test coverage
**Audit Points:**
- [ ] Memory safety tests (no information leakage)
- [ ] Display protection tests (all secret types)
- [ ] Serialization protection tests (JSON, YAML, bincode)
- [ ] Error handling security tests
- [ ] Plugin communication security tests
- [ ] Property-based security testing (if present)
#### ✅ Test Quality Assessment
```bash
# Verify test coverage
cargo test --all-features
cargo tarpaulin --all-features --out Html
# Review coverage report for security-critical paths
```
**Audit Points:**
- [ ] >95% test coverage for security-critical code
- [ ] All secret types have equivalent test coverage
- [ ] Edge cases and error conditions are tested
- [ ] Integration tests with Nushell plugin system
- [ ] Performance tests don't create security vulnerabilities
### 2. Memory Safety Testing
#### ✅ Miri Testing Verification
**Location**: CI/CD pipeline and local testing
**Check**: Memory safety validation
```bash
# Verify Miri testing is working
cargo +nightly miri test
# Should pass without undefined behavior warnings
```
**Audit Points:**
- [ ] Miri tests pass without warnings
- [ ] No undefined behavior detected
- [ ] Memory leaks are prevented
- [ ] Use-after-free vulnerabilities are prevented
- [ ] Buffer overflows are prevented
#### ✅ Sanitizer Testing
**Location**: Development testing
**Check**: Address sanitizer and other tools
```bash
# Address Sanitizer
RUSTFLAGS="-Z sanitizer=address" cargo test
# Memory Sanitizer
RUSTFLAGS="-Z sanitizer=memory" cargo test
```
**Audit Points:**
- [ ] AddressSanitizer finds no issues
- [ ] MemorySanitizer finds no issues
- [ ] No memory corruption detected
- [ ] All sanitizer runs are clean
## 🔐 Cryptographic Security Review
### 1. Random Number Generation (if applicable)
**Audit Points:**
- [ ] Uses cryptographically secure random number generation
- [ ] No predictable patterns in any generated values
- [ ] Proper entropy source usage
- [ ] No custom cryptographic implementations
### 2. Constant-Time Operations
#### ✅ Comparison Operations
**Location**: Secret type comparison implementations
**Check**: Timing attack prevention
```rust
// ✅ Secure comparison (if implemented)
impl PartialEq for SecretString {
fn eq(&self, other: &Self) -> bool {
use subtle::ConstantTimeEq;
self.inner.ct_eq(&other.inner).into()
}
}
```
**Audit Points:**
- [ ] Equality comparisons are constant-time (if implemented)
- [ ] No timing side-channels in comparison operations
- [ ] Use of `subtle` crate for constant-time operations
- [ ] Hash operations are timing-safe (if implemented)
## 🏗️ Architecture Security Review
### 1. Plugin Isolation
**Audit Points:**
- [ ] Plugin runs in appropriate security context
- [ ] No privilege escalation vulnerabilities
- [ ] Proper isolation from host system
- [ ] Resource usage limits are appropriate
- [ ] No network access unless required
### 2. Dependency Security
#### ✅ Dependency Audit
**Location**: `Cargo.toml` and `Cargo.lock`
**Check**: All dependencies are secure and up-to-date
```bash
# Verify dependency security
cargo audit
cargo deny check
```
**Audit Points:**
- [ ] All dependencies are from trusted sources
- [ ] No known vulnerabilities in dependency tree
- [ ] Dependencies are kept up-to-date
- [ ] Minimal dependency footprint
- [ ] License compatibility verified
### 3. Build Security
#### ✅ Supply Chain Security
**Location**: CI/CD pipeline
**Check**: Build process is secure
**Audit Points:**
- [ ] Reproducible builds
- [ ] Signed releases (if applicable)
- [ ] Secure CI/CD pipeline
- [ ] No malicious code injection in build process
- [ ] Binary integrity verification
## 🚨 Runtime Security Assessment
### 1. Production Deployment
**Audit Points:**
- [ ] Plugin installation process is secure
- [ ] File permissions are appropriate
- [ ] No sensitive information in installation artifacts
- [ ] Proper uninstallation cleanup
- [ ] No persistent sensitive data storage
### 2. Operational Security
**Audit Points:**
- [ ] Logging configuration is secure (no secret leakage)
- [ ] Monitoring doesn't expose sensitive data
- [ ] Backup procedures don't compromise secrets
- [ ] Incident response procedures are adequate
## 📊 Security Metrics
### Quantitative Security Measures
**Code Quality Metrics:**
- [ ] Static analysis score: Clean (no high/critical issues)
- [ ] Test coverage: >95% for security-critical paths
- [ ] Dependency vulnerabilities: 0 known issues
- [ ] Memory safety: 0 issues found by Miri/sanitizers
**Performance Security Metrics:**
- [ ] No timing side-channels detected
- [ ] Memory usage is bounded and predictable
- [ ] No resource exhaustion vulnerabilities
- [ ] Startup time is reasonable (< 100ms)
### Compliance Checklist
**Security Standards:**
- [ ] Follows OWASP secure coding practices
- [ ] Implements defense in depth
- [ ] Uses security by default principle
- [ ] Minimizes attack surface
- [ ] Provides clear security documentation
## 🎯 Final Security Assessment
### Critical Security Requirements ✅
**All items must be verified as passing:**
1. **Memory Safety** ✅
- [ ] All secret types implement secure memory cleanup
- [ ] Miri testing passes without warnings
- [ ] No memory leaks or corruption detected
2. **Display Protection** ✅
- [ ] No secret content ever displayed
- [ ] All display/debug implementations are secure
- [ ] Error messages don't leak secrets
3. **Serialization Security** ✅
- [ ] No secret content in serialized output
- [ ] Plugin communication is secure
- [ ] JSON/YAML/etc. output is redacted
4. **Command Security** ✅
- [ ] Unwrap operation includes security warnings
- [ ] All commands validate inputs properly
- [ ] Error handling is secure
5. **Testing Coverage** ✅
- [ ] Comprehensive security test suite
- [ ] >95% coverage for security-critical code
- [ ] Property-based security testing
6. **Architecture Security** ✅
- [ ] Secure plugin integration
- [ ] No privilege escalation
- [ ] Minimal trusted computing base
### Security Sign-off
**Reviewer Information:**
- **Name**: _________________
- **Role**: _________________
- **Date**: _________________
- **Security Clearance Level**: _________________
**Final Assessment:**
- [ ] **PASS**: All critical security requirements met
- [ ] **CONDITIONAL PASS**: Minor issues identified (see notes)
- [ ] **FAIL**: Critical security issues found (see notes)
**Notes:**
```
[Space for security reviewer notes and recommendations]
```
**Recommendations:**
- [ ] Ready for production deployment
- [ ] Requires minor security improvements
- [ ] Requires major security remediation
- [ ] Not recommended for production use
## 📋 Post-Audit Actions
### For PASS Rating
1. [ ] Document security review completion
2. [ ] Update security documentation if needed
3. [ ] Schedule periodic security re-assessment
4. [ ] Monitor for new vulnerabilities in dependencies
### For CONDITIONAL PASS Rating
1. [ ] Address identified minor issues
2. [ ] Re-test affected components
3. [ ] Update documentation
4. [ ] Schedule re-audit after fixes
### For FAIL Rating
1. [ ] Stop production deployment
2. [ ] Document critical issues
3. [ ] Create remediation plan with timeline
4. [ ] Schedule full re-audit after remediation
---
**This checklist ensures comprehensive security review of the nu_plugin_secret implementation and deployment. All items should be verified by qualified security personnel before production use.**