forked from mia/Aegisub
Completely remove the usage of POSIX functions from Acs. I've discovered the hard way that most things POSIX on Windows is a complete disaster.
With this we're now using native functions and all unit tests pass. The code used in Check() is still a proof of concept and will probably be rewritten as issues are exposed. Originally committed to SVN as r4354.
This commit is contained in:
Amar Takhar
parent
69ae630488
commit
25497cf87d
1 changed files with 87 additions and 41 deletions
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@ -19,25 +19,14 @@
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/// @ingroup libaegisub windows
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#ifndef LAGI_PRE
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#include <sys/stat.h>
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#include <io.h>
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#include <errno.h>
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#include <windows.h>
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#include <iostream>
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#include <fstream>
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#endif
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#ifndef R_OK
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#define R_OK 04
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#endif
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#ifndef W_OK
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#define W_OK 02
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#endif
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#pragma warning(disable: 4996)
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#include "libaegisub/util.h"
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#include "libaegisub/util_win.h"
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namespace agi {
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namespace acs {
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@ -61,24 +50,43 @@ void CheckDirWrite(const std::string &dir) {
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Check(dir, acs::DirWrite);
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}
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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(const std::string &file, acs::Type type) {
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struct stat file_stat;
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int file_status;
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std::wstring wfile;
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wfile.assign(file.begin(), file.end());
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file_status = stat(file.c_str(), &file_stat);
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SECURITY_DESCRIPTOR* sd;
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DWORD len = 0;
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SECURITY_INFORMATION info = OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION;
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HANDLE client_token;
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PRIVILEGE_SET priv_set;
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DWORD priv_set_size = sizeof(PRIVILEGE_SET);
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BOOL access_ok;
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GENERIC_MAPPING generic_mapping;
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DWORD access_check;
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DWORD access;
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DWORD file_attr;
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if (file_status != 0) {
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switch (errno) {
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case ENOENT:
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file_attr = GetFileAttributes(wfile.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 AcsNotFound("File or path not found.");
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break;
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case EACCES:
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throw AcsAccess("Access Denied to file, path or path component.");
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case ERROR_ACCESS_DENIED:
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throw AcsAccess("Access denied to file or path component");
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break;
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case EIO:
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default:
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throw AcsFatal("Fatal I/O error occurred.");
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break;
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}
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@ -86,33 +94,71 @@ void Check(const std::string &file, acs::Type type) {
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switch (type) {
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case FileRead:
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case FileWrite:
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if ((file_stat.st_mode & S_IFREG) == 0)
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case FileWrite: {
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if ((file_attr & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)
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throw AcsNotAFile("Not a file.");
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break;
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}
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case DirRead:
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case DirWrite:
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if ((file_stat.st_mode & S_IFDIR) == 0)
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case DirWrite: {
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if ((file_attr & FILE_ATTRIBUTE_DIRECTORY) != FILE_ATTRIBUTE_DIRECTORY)
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throw AcsNotADirectory("Not a directory.");
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break;
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}
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}
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GetFileSecurity(wfile.c_str(), info, NULL, 0, &len);
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if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
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std::cout << "GetFileSecurity: fatal: " << util::ErrorString(GetLastError()) << std::endl;
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}
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sd = (SECURITY_DESCRIPTOR *)malloc(len);
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if (sd == NULL) {
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std::cout << "GetFileSecurity: insufficient memory" << std::endl;
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} else {
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if (!GetFileSecurity(wfile.c_str(), info, sd, len, &len)) {
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std::cout << "GetFileSecurity failed: " << util::ErrorString(GetLastError()) << std::endl;
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free(sd);
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}
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}
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ImpersonateSelf(SecurityImpersonation);
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if (!OpenThreadToken(GetCurrentThread(), TOKEN_ALL_ACCESS, TRUE, &client_token)) {
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std::cout << "OpenThreadToken failed: " << util::ErrorString(GetLastError()) << std::endl;
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}
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switch (type) {
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case DirRead:
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case FileRead:
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file_status = access(file.c_str(), R_OK);
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if (file_status != 0)
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case FileRead: {
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access_check = FILE_READ_DATA;
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MapGenericMask(&access_check, &generic_mapping);
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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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std::cout << "AccessCheck failed: " << util::ErrorString(GetLastError()) << std::endl;
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}
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free(sd);
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if (!access)
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throw AcsRead("File or directory is not readable.");
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break;
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}
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case DirWrite:
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case FileWrite:
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file_status = access(file.c_str(), W_OK);
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if (file_status != 0)
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case FileWrite: {
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access_check = FILE_APPEND_DATA | FILE_WRITE_DATA;
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MapGenericMask(&access_check, &generic_mapping);
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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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std::cout << "AccessCheck failed: " << util::ErrorString(GetLastError()) << std::endl;
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}
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free(sd);
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if (!access)
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throw AcsWrite("File or directory is not writable.");
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break;
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}
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default: {
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std::cout << "Warning: type not handled" << std::endl;
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free(sd);
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}
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}
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}
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} // namespace Access
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} // namespace agi
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