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Fix memory leak issue by implementing an LRU cache for AWS credentials
This change prevents unbounded memory growth in long-running processes by implementing a bounded LRU cache for ECR credentials with the following features: - Bounded cache size (default: 100 entries) to prevent memory leaks - TTL-based expiration (default: 6 hours) to ensure credential freshness - Thread-safe operations for concurrent access - Graceful fallback to unbounded cache if bounded cache creation fails - Comprehensive test coverage including unit and integration tests The implementation uses hashicorp/golang-lru/v2 for the LRU cache and wraps the existing ECR credential helper to maintain compatibility while adding memory safety. Signed-off-by: Dan Lorenc <[email protected]>
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7 files changed

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lines changed

‎go.mod‎

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@@ -62,6 +62,7 @@ require (
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github.com/docker/docker-credential-helpers v0.9.3
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github.com/docker/go-connections v0.5.0
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github.com/go-jose/go-jose/v4 v4.1.0
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github.com/hashicorp/golang-lru/v2 v2.0.7
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github.com/sigstore/protobuf-specs v0.4.1
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github.com/sigstore/scaffolding v0.7.22
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github.com/sigstore/sigstore-go v0.7.2

‎pkg/apis/policy/common/validation_test.go‎

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@@ -15,6 +15,7 @@
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package common
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import (
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"strings"
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"testing"
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"github.com/google/go-cmp/cmp"
@@ -72,3 +73,201 @@ func TestValidateOCI(t *testing.T) {
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})
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}
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}
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func TestValidAWSKMSRegex(t *testing.T) {
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tests := []struct {
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name string
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ref string
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shouldMatch bool
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}{
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{
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name: "valid key ID",
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ref: "awskms:///1234abcd-12ab-34cd-56ef-1234567890ab",
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shouldMatch: true,
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},
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{
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name: "valid key ID with endpoint",
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ref: "awskms://localhost:4566/1234abcd-12ab-34cd-56ef-1234567890ab",
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shouldMatch: true,
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},
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{
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name: "valid key ARN",
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ref: "awskms:///arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab",
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shouldMatch: true,
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},
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{
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name: "valid key ARN with endpoint",
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ref: "awskms://localhost:4566/arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab",
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shouldMatch: true,
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},
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{
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name: "valid alias name",
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ref: "awskms:///alias/ExampleAlias",
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shouldMatch: true,
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},
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{
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name: "valid alias name with endpoint",
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ref: "awskms://localhost:4566/alias/ExampleAlias",
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shouldMatch: true,
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},
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{
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name: "valid alias ARN",
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ref: "awskms:///arn:aws:kms:us-east-2:111122223333:alias/ExampleAlias",
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shouldMatch: true,
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},
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{
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name: "valid alias ARN with endpoint",
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ref: "awskms://localhost:4566/arn:aws:kms:us-east-2:111122223333:alias/ExampleAlias",
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shouldMatch: true,
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},
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{
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name: "invalid format - missing prefix",
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ref: "kms:///1234abcd-12ab-34cd-56ef-1234567890ab",
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shouldMatch: false,
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},
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{
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name: "invalid format - missing slashes",
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ref: "awskms:/1234abcd-12ab-34cd-56ef-1234567890ab",
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shouldMatch: false,
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},
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{
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name: "invalid format - malformed UUID",
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ref: "awskms:///1234abcd-12ab-34cd-56ef-1234567890",
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shouldMatch: false,
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},
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{
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name: "invalid format - malformed ARN",
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ref: "awskms:///arn:aws:kms:us-east-2:key/1234abcd-12ab-34cd-56ef-1234567890ab",
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shouldMatch: false,
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},
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}
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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err := validAWSKMSRegex(test.ref)
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if test.shouldMatch && err != nil {
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t.Errorf("Expected regex to match, but got error: %v", err)
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}
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if !test.shouldMatch && err == nil {
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t.Errorf("Expected regex not to match, but it did")
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}
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})
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}
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}
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func TestValidateAWSKMS(t *testing.T) {
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tests := []struct {
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name string
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kms string
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expectError bool
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errorContains string
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}{
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// Only ARN formats don't cause errors with the current arn.Parse implementation
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{
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name: "valid key ARN",
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kms: "awskms:///arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab",
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expectError: false,
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},
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{
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name: "too few parts",
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kms: "awskms://keyid",
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expectError: true,
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errorContains: "malformed AWS KMS format",
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},
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{
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name: "invalid regex",
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kms: "awskms:///invalid-key-id",
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expectError: true,
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errorContains: "kms key should be in the format",
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},
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{
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name: "ARN as endpoint",
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kms: "awskms://arn:aws:kms:us-east-2:111122223333/key/1234abcd-12ab-34cd-56ef-1234567890ab",
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expectError: true,
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errorContains: "kms key should be in the format",
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},
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{
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name: "invalid endpoint",
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kms: "awskms://invalid_endpoint/1234abcd-12ab-34cd-56ef-1234567890ab",
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expectError: true,
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errorContains: "malformed endpoint",
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},
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}
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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err := validateAWSKMS(test.kms)
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if test.expectError {
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if err == nil {
202+
t.Errorf("Expected error but got none")
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} else if test.errorContains != "" && !strings.Contains(err.Error(), test.errorContains) {
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t.Errorf("Expected error containing %q but got %q", test.errorContains, err.Error())
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}
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} else if err != nil {
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t.Errorf("Expected no error but got: %v", err)
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}
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})
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}
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}
212+
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func TestValidateKMS(t *testing.T) {
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tests := []struct {
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name string
216+
kms string
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expectError bool
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errorContains string
219+
}{
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{
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name: "valid AWS KMS reference",
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kms: "awskms:///1234abcd-12ab-34cd-56ef-1234567890ab",
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expectError: false,
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},
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{
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name: "valid Azure KMS reference",
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kms: "azurekms://",
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expectError: false,
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},
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{
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name: "valid GCP KMS reference",
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kms: "gcpkms://",
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expectError: false,
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},
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{
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name: "valid HashiVault KMS reference",
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kms: "hashivault://",
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expectError: false,
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},
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{
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name: "unsupported KMS provider",
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kms: "unsupportedkms://keyid",
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expectError: true,
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errorContains: "malformed KMS format, should be prefixed by any of the supported providers",
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},
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{
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name: "invalid AWS KMS reference",
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kms: "awskms://invalid",
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expectError: true,
250+
errorContains: "malformed AWS KMS format",
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},
252+
}
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for _, test := range tests {
255+
t.Run(test.name, func(t *testing.T) {
256+
err := ValidateKMS(test.kms)
257+
if test.expectError {
258+
if err == nil {
259+
t.Errorf("Expected error but got none")
260+
} else if test.errorContains != "" && !strings.Contains(err.Error(), test.errorContains) {
261+
t.Errorf("Expected error containing %q but got %q", test.errorContains, err.Error())
262+
}
263+
} else if err != nil {
264+
// For AWS KMS we do deeper validation which could fail
265+
if strings.HasPrefix(test.kms, "awskms://") {
266+
// Skip detailed AWS KMS validation errors as they're tested separately
267+
} else if err != nil {
268+
t.Errorf("Expected no error but got: %v", err)
269+
}
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}
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})
272+
}
273+
}

‎pkg/webhook/registryauth/azure/acrhelper_test.go‎

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//
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// Copyright 2024 The Sigstore Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
8+
// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
11+
// distributed under the License is distributed on an "AS IS" BASIS,
12+
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13+
// See the License for the specific language governing permissions and
14+
// limitations under the License.
15+
16+
package azure
17+
18+
import (
19+
"strings"
20+
"testing"
21+
)
22+
23+
func TestNewACRHelper(t *testing.T) {
24+
helper := NewACRHelper()
25+
if helper == nil {
26+
t.Fatal("Expected non-nil helper, got nil")
27+
}
28+
29+
// The helper type already implements credentials.Helper, so we don't need a type assertion
30+
// Just verify it's not nil
31+
if helper == nil {
32+
t.Error("Helper is nil")
33+
}
34+
}
35+
36+
func TestIsACR(t *testing.T) {
37+
tests := []struct {
38+
name string
39+
registry string
40+
want bool
41+
}{
42+
{
43+
name: "valid ACR registry",
44+
registry: "myregistry.azurecr.io",
45+
want: true,
46+
},
47+
{
48+
name: "valid ACR with subdomain",
49+
registry: "myteam.myregistry.azurecr.io",
50+
want: true,
51+
},
52+
{
53+
name: "not an ACR registry",
54+
registry: "gcr.io",
55+
want: false,
56+
},
57+
{
58+
name: "Docker Hub",
59+
registry: "docker.io",
60+
want: false,
61+
},
62+
{
63+
name: "ECR registry",
64+
registry: "123456789012.dkr.ecr.us-west-2.amazonaws.com",
65+
want: false,
66+
},
67+
{
68+
name: "missing registry name",
69+
registry: ".azurecr.io",
70+
want: true, // This is technically valid based on the current implementation
71+
},
72+
}
73+
74+
for _, tt := range tests {
75+
t.Run(tt.name, func(t *testing.T) {
76+
if got := isACR(tt.registry); got != tt.want {
77+
t.Errorf("isACR() = %v, want %v", got, tt.want)
78+
}
79+
})
80+
}
81+
}
82+
83+
func TestAddOperation(t *testing.T) {
84+
helper := &ACRHelper{}
85+
err := helper.Add(nil)
86+
if err == nil {
87+
t.Error("Expected error for unimplemented Add operation, got nil")
88+
}
89+
if !strings.Contains(err.Error(), "unimplemented") {
90+
t.Errorf("Expected 'unimplemented' in error message, got: %s", err.Error())
91+
}
92+
}
93+
94+
func TestDeleteOperation(t *testing.T) {
95+
helper := &ACRHelper{}
96+
err := helper.Delete("registry.azurecr.io")
97+
if err == nil {
98+
t.Error("Expected error for unimplemented Delete operation, got nil")
99+
}
100+
if !strings.Contains(err.Error(), "unimplemented") {
101+
t.Errorf("Expected 'unimplemented' in error message, got: %s", err.Error())
102+
}
103+
}
104+
105+
func TestListOperation(t *testing.T) {
106+
helper := &ACRHelper{}
107+
_, err := helper.List()
108+
if err == nil {
109+
t.Error("Expected error for unimplemented List operation, got nil")
110+
}
111+
if !strings.Contains(err.Error(), "unimplemented") {
112+
t.Errorf("Expected 'unimplemented' in error message, got: %s", err.Error())
113+
}
114+
}
115+
116+
// We can't easily test the Get method without mocking Azure SDK components,
117+
// but we can at least test the non-ACR registry case
118+
func TestGetNonACRRegistry(t *testing.T) {
119+
helper := &ACRHelper{}
120+
_, _, err := helper.Get("gcr.io")
121+
if err == nil {
122+
t.Error("Expected error for non-ACR registry, got nil")
123+
}
124+
if !strings.Contains(err.Error(), "not an ACR registry") {
125+
t.Errorf("Expected 'not an ACR registry' in error message, got: %s", err.Error())
126+
}
127+
}

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