AuroraRuntime/Source/IO/FS/FileTrust.Unix.cpp

/***
    Copyright (C) 2023 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: FileTrust.Unix.cpp
    Date: 2023-1-25
    Author: Reece
***/
#include <Source/RuntimeInternal.hpp>
#include "FS.hpp"
#include "FileTrust.Unix.hpp"

#include <sys/xattr.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>

namespace Aurora::IO::FS
{
    AUKN_SYM bool BlockFile(const AuString &path)
    {
        auto srcPath = NormalizePathRet(path);
        if (srcPath.empty())
        {
            SysPushErrorMemory();
            return {};
        }

        AuString subdir;

        if ((path.size() > 1) &&
            ((path[path.size() - 1] == '/') ||
            (path[path.size() - 1] == '\\')))
        {
            subdir = srcPath.substr(0, srcPath.size() - 1);
        }
        else
        {
            subdir = srcPath;
        }

        GoUpToSeparator(subdir, subdir);

        subdir = "file:///" + subdir;

        if (::setxattr(srcPath.c_str(), "user.xdg.origin.url", subdir.c_str(), subdir.size(), XATTR_CREATE) == -1)
        {
            if (errno == EEXIST)
            {
                if (::setxattr(srcPath.c_str(), "user.xdg.origin.url", subdir.c_str(), subdir.size(), XATTR_REPLACE) == -1)
                {
                    return false;
                }
            }
        }

        if (::setxattr(srcPath.c_str(), "user.xdg.referrer.url", subdir.c_str(), subdir.size(), XATTR_CREATE) == -1)
        {
            if (errno == EEXIST)
            {
                if (::setxattr(srcPath.c_str(), "user.xdg.referrer.url", subdir.c_str(), subdir.size(), XATTR_REPLACE) == -1)
                {
                    return false;
                }
            }
        }
        
        mode_t mode { 0644 };
        struct stat s;
        if (::stat(srcPath.c_str(), &s) == 0)
        {
            mode = s.st_mode;
            mode &= ~( 0111 );
        }

        if (::chmod(srcPath.c_str(), mode) != 0)
        {
            SysPushErrorIO("BlockFile chmod failed: {}", path);
        }

        return true;
    }

    AUKN_SYM bool UnblockFile(const AuString &path)
    {
        auto srcPath = NormalizePathRet(path);
        if (srcPath.empty())
        {
            SysPushErrorMemory();
            return {};
        }

        ::removexattr(srcPath.c_str(), "user.xdg.origin.url");
        ::removexattr(srcPath.c_str(), "user.xdg.referrer.url");

        mode_t mode { 0644 };
        struct stat s;
        if (::stat(srcPath.c_str(), &s) == 0)
        {
            mode = s.st_mode;
            mode &= ~(0111);
        }

        if (::chmod(srcPath.c_str(), mode) != 0)
        {
            SysPushErrorIO("UnblockFile chmod failed: {}", path);
        }

        return AuFS::FileExists(srcPath);
    }

    AUKN_SYM bool TrustFile(const AuString &path)
    {
        struct stat s;
        mode_t mode { 0755 };

        auto srcPath = NormalizePathRet(path);
        if (srcPath.empty())
        {
            SysPushErrorMemory();
            return {};
        }

        if (::stat(srcPath.c_str(), &s) == 0)
        {
            mode = s.st_mode;
            mode |= 0111;
        }

        if (::chmod(srcPath.c_str(), mode) != 0)
        {
            SysPushErrorIO("chmod failed: {}", path);
            return false;
        }

        return true;
    }

    AUKN_SYM bool IsFileBlocked(const AuString &path)
    {
        auto srcPath = NormalizePathRet(path);
        if (srcPath.empty())
        {
            SysPushErrorMemory();
            return {};
        }

        auto length = ::getxattr(srcPath.c_str(), "user.xdg.referrer.url", nullptr, 0);
        if (length > 0)
        {
            return true;
        }

        length = ::getxattr(srcPath.c_str(), "user.xdg.origin.url", nullptr, 0);
        if (length > 0)
        {
            return true;
        }

        return false;
    }

    AUKN_SYM bool IsFileTrusted(const AuString &path)
    {
        struct stat s;
        auto srcPath = NormalizePathRet(path);
        if (srcPath.empty())
        {
            SysPushErrorMemory();
            return {};
        }

        if (::stat(srcPath.c_str(), &s) == 0)
        {
            return (s.st_mode & 0111) != 0;
        }
        else
        {
            return false;
        }
    }
}