1 files changed, 129 insertions, 0 deletions
diff --git a/dev/kernel/src/UserMgr.cc b/dev/kernel/src/UserMgr.cc
new file mode 100644
index 00000000..c41b445b
--- /dev/null
+++ b/dev/kernel/src/UserMgr.cc
@@ -0,0 +1,129 @@
+/*
+ *	========================================================
+ *
+ *  	NeKernel
+ * 		Copyright (C) 2024-2025, Amlal El Mahrouss, all rights reserved.
+ *
+ *		File: User.cc
+ * 		Purpose: User class, used to provide authentication and security.
+ *
+ * 	========================================================
+ */
+
+#include <KernelKit/FileMgr.h>
+#include <KernelKit/HeapMgr.h>
+#include <KernelKit/KPC.h>
+#include <KernelKit/UserMgr.h>
+#include <NeKit/KernelPanic.h>
+
+#define kStdUserType (0xEE)
+#define kSuperUserType (0xEF)
+
+/// @file User.cc
+/// @brief Multi-user support.
+
+namespace Kernel {
+namespace Detail {
+  ////////////////////////////////////////////////////////////
+  /// \brief Constructs a password by hashing the password.
+  /// \param password password to hash.
+  /// \return the hashed password
+  ////////////////////////////////////////////////////////////
+  STATIC UInt64 user_fnv_generator(const Char* password, User* user) {
+    if (!password || !user) return 1;
+    if (*password == 0) return 1;
+
+    kout << "user_fnv_generator: Hashing user password...\r";
+
+    const UInt64 FNV_OFFSET_BASIS = 0xcbf29ce484222325ULL;
+    const UInt64 FNV_PRIME        = 0x100000001b3ULL;
+
+    UInt64 hash = FNV_OFFSET_BASIS;
+
+    while (*password) {
+      hash ^= (Utf8Char) (*password++);
+      hash *= FNV_PRIME;
+    }
+
+    kout << "user_fnv_generator: Hashed user password.\r";
+
+    return 0;
+  }
+}  // namespace Detail
+
+////////////////////////////////////////////////////////////
+/// @brief User ring constructor.
+////////////////////////////////////////////////////////////
+User::User(const Int32& sel, const Char* user_name) : mUserRing((UserRingKind) sel) {
+  MUST_PASS(sel >= 0);
+  rt_copy_memory((VoidPtr) user_name, this->mUserName, rt_string_len(user_name));
+}
+
+////////////////////////////////////////////////////////////
+/// @brief User ring constructor.
+////////////////////////////////////////////////////////////
+User::User(const UserRingKind& ring_kind, const Char* user_name) : mUserRing(ring_kind) {
+  rt_copy_memory((VoidPtr) user_name, this->mUserName, rt_string_len(user_name));
+}
+
+////////////////////////////////////////////////////////////
+/// @brief User destructor class.
+////////////////////////////////////////////////////////////
+User::~User() = default;
+
+Bool User::Save(const UserPublicKey password) noexcept {
+  if (!password || *password == 0) return No;
+
+  this->mUserFNV = Detail::user_fnv_generator(password, this);
+
+  kout << "User::Save: Saved password successfully...\r";
+
+  return Yes;
+}
+
+Bool User::Login(const UserPublicKey password) noexcept {
+  if (!password || !*password) return No;
+
+  // now check if the password matches.
+  if (this->mUserFNV == Detail::user_fnv_generator(password, this)) {
+    kout << "User::Login: Password matches.\r";
+    return Yes;
+  }
+
+  kout << "User::Login: Password doesn't match.\r";
+  return No;
+}
+
+Bool User::operator==(const User& lhs) {
+  return lhs.mUserRing == this->mUserRing;
+}
+
+Bool User::operator!=(const User& lhs) {
+  return lhs.mUserRing != this->mUserRing;
+}
+
+////////////////////////////////////////////////////////////
+/// @brief Returns the user's name.
+////////////////////////////////////////////////////////////
+
+Char* User::Name() noexcept {
+  return this->mUserName;
+}
+
+////////////////////////////////////////////////////////////
+/// @brief Returns the user's ring.
+/// @return The king of ring the user is attached to.
+////////////////////////////////////////////////////////////
+
+const UserRingKind& User::Ring() noexcept {
+  return this->mUserRing;
+}
+
+Bool User::IsStdUser() noexcept {
+  return this->Ring() == UserRingKind::kRingStdUser;
+}
+
+Bool User::IsSuperUser() noexcept {
+  return this->Ring() == UserRingKind::kRingSuperUser;
+}
+}  // namespace Kernel