108 lines
3.8 KiB
C++
108 lines
3.8 KiB
C++
// Copyright (c) 2010, Amar Takhar <verm@aegisub.org>
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//
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// Permission to use, copy, modify, and distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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/// @file access.cpp
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/// @brief Windows access methods.
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/// @ingroup libaegisub windows
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#include <libaegisub/access.h>
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#include <libaegisub/format.h>
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#include <libaegisub/format_path.h>
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#include <libaegisub/fs.h>
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#include <libaegisub/log.h>
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#include <libaegisub/util.h>
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#include <boost/filesystem.hpp>
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#include <windows.h>
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namespace {
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bool check_permission(bool is_read, SECURITY_DESCRIPTOR *sd, HANDLE client_token) {
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DWORD access_check = is_read ? FILE_READ_DATA : FILE_APPEND_DATA | FILE_WRITE_DATA;
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GENERIC_MAPPING generic_mapping;
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MapGenericMask(&access_check, &generic_mapping);
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PRIVILEGE_SET priv_set;
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DWORD priv_set_size = sizeof(PRIVILEGE_SET);
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DWORD access;
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BOOL access_ok;
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if(!AccessCheck(sd, client_token, access_check, &generic_mapping, &priv_set, &priv_set_size, &access, &access_ok))
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LOG_W("acs/check") << "AccessCheck failed: " << agi::util::ErrorString(GetLastError());
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return !!access;
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}
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}
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namespace agi {
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namespace acs {
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/*
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This function is still a proof of concept, it's probably rife with bugs, below
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is a short (and incomplete) todo
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* "Basic" checks (Read/Write/File/Dir) checks for FAT32 filesystems which
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requires detecting the filesystem being used.
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*/
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void Check(fs::path const& file, acs::Type type) {
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DWORD file_attr = GetFileAttributes(file.c_str());
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if ((file_attr & INVALID_FILE_ATTRIBUTES) == INVALID_FILE_ATTRIBUTES) {
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switch (GetLastError()) {
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case ERROR_FILE_NOT_FOUND:
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case ERROR_PATH_NOT_FOUND:
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throw fs::FileNotFound(file);
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case ERROR_ACCESS_DENIED:
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throw fs::ReadDenied(file);
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default:
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throw fs::FileSystemUnknownError(agi::format("Unexpected error when getting attributes for \"%s\": %s", file, util::ErrorString(GetLastError())));
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}
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}
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switch (type) {
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case FileRead:
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case FileWrite:
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if ((file_attr & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)
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throw fs::NotAFile(file);
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break;
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case DirRead:
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case DirWrite:
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if ((file_attr & FILE_ATTRIBUTE_DIRECTORY) != FILE_ATTRIBUTE_DIRECTORY)
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throw fs::NotADirectory(file);
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break;
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}
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SECURITY_INFORMATION info = OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION;
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DWORD len = 0;
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GetFileSecurity(file.c_str(), info, nullptr, 0, &len);
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if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
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LOG_W("acs/check") << "GetFileSecurity: fatal: " << util::ErrorString(GetLastError());
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std::vector<uint8_t> sd_buff(len);
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SECURITY_DESCRIPTOR *sd = (SECURITY_DESCRIPTOR *)&sd_buff[0];
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if (!GetFileSecurity(file.c_str(), info, sd, len, &len))
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LOG_W("acs/check") << "GetFileSecurity failed: " << util::ErrorString(GetLastError());
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ImpersonateSelf(SecurityImpersonation);
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HANDLE client_token;
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if (!OpenThreadToken(GetCurrentThread(), TOKEN_ALL_ACCESS, TRUE, &client_token))
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LOG_W("acs/check") << "OpenThreadToken failed: " << util::ErrorString(GetLastError());
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if (!check_permission(true, sd, client_token))
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throw fs::ReadDenied(file);
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if ((type == DirWrite || type == FileWrite) && !check_permission(false, sd, client_token))
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throw fs::WriteDenied(file);
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}
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} // namespace Access
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} // namespace agi
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