mirror of
https://github.com/shankar0123/certctl.git
synced 2026-06-07 22:21:30 +00:00
shankar0123
995b72df05
Replace static env-var-based issuer wiring with GUI-driven dynamic configuration stored encrypted in PostgreSQL. Operators can now configure, test, enable/disable, and manage issuers from the dashboard without restarting the server. Key changes: - AES-256-GCM encryption for sensitive issuer config at rest (PBKDF2 key derivation with 100k iterations) - Dynamic IssuerRegistry with sync.RWMutex replacing static map - Connector factory pattern (issuerfactory.NewFromConfig) replacing 140 lines of static wiring in main.go - Migration 000009: encrypted_config, last_tested_at, test_status, source columns on issuers table - Env var seeding on first boot with ON CONFLICT DO NOTHING - Registry Rebuild() for atomic map swap after CRUD operations - Issuer type validation against domain constants on Create - Audit trail for test connection results - Conditional seeding for step-ca/OpenSSL (only when env vars set) - GUI: source badge, connection test status on issuer detail page Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
104 lines
3.2 KiB
Go
104 lines
3.2 KiB
Go
// Package crypto provides AES-256-GCM encryption for sensitive configuration data.
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package crypto
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"crypto/sha256"
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"fmt"
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"io"
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"golang.org/x/crypto/pbkdf2"
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)
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// Encrypt encrypts plaintext using AES-256-GCM with a random 12-byte nonce prepended to the output.
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// The key must be exactly 32 bytes (AES-256). Returns [12-byte nonce][ciphertext+tag].
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func Encrypt(plaintext []byte, key []byte) ([]byte, error) {
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if len(key) != 32 {
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return nil, fmt.Errorf("encryption key must be exactly 32 bytes, got %d", len(key))
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, fmt.Errorf("failed to create AES cipher: %w", err)
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return nil, fmt.Errorf("failed to create GCM: %w", err)
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}
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nonce := make([]byte, gcm.NonceSize())
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if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
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return nil, fmt.Errorf("failed to generate nonce: %w", err)
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}
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ciphertext := gcm.Seal(nonce, nonce, plaintext, nil)
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return ciphertext, nil
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}
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// Decrypt decrypts ciphertext that was encrypted with Encrypt.
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// Expects format: [12-byte nonce][ciphertext+tag]. Key must be exactly 32 bytes.
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func Decrypt(ciphertext []byte, key []byte) ([]byte, error) {
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if len(key) != 32 {
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return nil, fmt.Errorf("encryption key must be exactly 32 bytes, got %d", len(key))
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, fmt.Errorf("failed to create AES cipher: %w", err)
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return nil, fmt.Errorf("failed to create GCM: %w", err)
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}
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nonceSize := gcm.NonceSize()
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if len(ciphertext) < nonceSize {
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return nil, fmt.Errorf("ciphertext too short: %d bytes", len(ciphertext))
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}
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nonce, ciphertextBody := ciphertext[:nonceSize], ciphertext[nonceSize:]
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plaintext, err := gcm.Open(nil, nonce, ciphertextBody, nil)
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if err != nil {
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return nil, fmt.Errorf("failed to decrypt: %w", err)
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}
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return plaintext, nil
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}
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// DeriveKey derives a 32-byte AES-256 key from a passphrase using PBKDF2-SHA256.
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// Uses a fixed application-specific salt and 100,000 iterations for resistance
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// to brute-force attacks on weak passphrases.
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func DeriveKey(passphrase string) []byte {
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// Fixed salt is acceptable here because:
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// 1. Each certctl instance has its own passphrase
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// 2. The salt prevents generic rainbow table attacks
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// 3. Per-user salts are unnecessary (single server key, not user passwords)
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salt := []byte("certctl-config-encryption-v1")
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return pbkdf2.Key([]byte(passphrase), salt, 100000, 32, sha256.New)
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}
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// EncryptIfKeySet encrypts plaintext if a key is provided, otherwise returns plaintext unchanged.
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// This supports the development/demo fallback where encryption isn't configured.
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func EncryptIfKeySet(plaintext []byte, key []byte) ([]byte, bool, error) {
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if len(key) == 0 {
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return plaintext, false, nil
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}
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encrypted, err := Encrypt(plaintext, key)
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if err != nil {
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return nil, false, err
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}
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return encrypted, true, nil
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}
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// DecryptIfKeySet decrypts ciphertext if a key is provided, otherwise returns ciphertext unchanged.
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func DecryptIfKeySet(ciphertext []byte, key []byte) ([]byte, error) {
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if len(key) == 0 {
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return ciphertext, nil
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}
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return Decrypt(ciphertext, key)
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}
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