fix(tfstated): hash passwords instead of relying on the database encryption key

pkg/model/account.go

@@ -1,15 +1,41 @@
 package model
 
-import "time"
+import (
+	"crypto/sha256"
+	"crypto/subtle"
+	"time"
+
+	"git.adyxax.org/adyxax/tfstated/pkg/scrypto"
+	"golang.org/x/crypto/pbkdf2"
+)
+
+const (
+	PBKDF2Iterations = 600000
+	SaltSize         = 32
+)
 
 type AccountContextKey struct{}
 
 type Account struct {
-	Id        int
-	Username  string
-	Password  string
-	IsAdmin   bool
-	Created   time.Time
-	LastLogin time.Time
-	Settings  any
+	Id           int
+	Username     string
+	Salt         []byte
+	PasswordHash []byte
+	IsAdmin      bool
+	Created      time.Time
+	LastLogin    time.Time
+	Settings     any
+}
+
+func (account *Account) CheckPassword(password string) bool {
+	hash := HashPassword(password, account.Salt)
+	return subtle.ConstantTimeCompare(hash, account.PasswordHash) == 1
+}
+
+func GenerateSalt() []byte {
+	return scrypto.RandomBytes(SaltSize)
+}
+
+func HashPassword(password string, salt []byte) []byte {
+	return pbkdf2.Key([]byte(password), salt, PBKDF2Iterations, 32, sha256.New)
 }