feat(server): Add Embedded HTTP Server & REST API, Systemd Service Manager, Multi-User Auth, Syslog, Crond, and Server Metrics

include/security/auth.h

@@ -0,0 +1,34 @@
+#ifndef _SECURITY_AUTH_H
+#define _SECURITY_AUTH_H
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+#define MAX_USERS 16
+
+typedef struct user_account {
+    uint32_t uid;
+    uint32_t gid;
+    char username[32];
+    char full_name[64];
+    char home_dir[64];
+    char shell[32];
+    char password_hash[65]; // 64-char SHA256 hex string + null
+    bool in_use;
+} user_account_t;
+
+void auth_init(void);
+int  auth_add_user(const char* username, const char* password, uint32_t uid, uint32_t gid, const char* home, const char* shell);
+bool auth_verify_password(const char* username, const char* password);
+int  auth_change_password(const char* username, const char* new_password);
+const user_account_t* auth_get_user_by_name(const char* username);
+const user_account_t* auth_get_user_by_uid(uint32_t uid);
+
+const user_account_t* auth_get_current_user(void);
+int auth_set_current_user(const char* username);
+
+size_t auth_get_user_count(void);
+const user_account_t* auth_get_user_by_index(size_t index);
+
+#endif // _SECURITY_AUTH_H