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dll: relative symbolic link resolution testing

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This commit is contained in:
Bill Zissimopoulos
2016-09-12 21:41:48 -07:00
parent c12b88286d
commit 5888e9ab05
2 changed files with 56 additions and 30 deletions
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85
src/dll/fsop.c
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@@ -1017,35 +1017,41 @@ FSP_API BOOLEAN FspFileSystemFindReparsePoint(FSP_FILE_SYSTEM *FileSystem,
PVOID Context,
PWSTR FileName, PUINT32 PReparsePointIndex)
{
WCHAR *p, *lastp;
PWSTR RemainderPath, LastPathComponent;
NTSTATUS Result;
p = FileName;
RemainderPath = FileName;
for (;;)
{
while (L'\\' == *p)
p++;
lastp = p;
while (L'\\' != *p)
while (L'\\' == *RemainderPath)
RemainderPath++;
LastPathComponent = RemainderPath;
while (L'\\' != *RemainderPath)
{
if (L'\0' == *p)
if (L'\0' == *RemainderPath)
return FALSE;
p++;
RemainderPath++;
}
*p = L'\0';
*RemainderPath = L'\0';
Result = GetReparsePointByName(FileSystem, Context, FileName, TRUE, 0, 0);
*p = L'\\';
*RemainderPath = L'\\';
if (!NT_SUCCESS(Result))
if (STATUS_NOT_A_REPARSE_POINT == Result)
/* it was not a reparse point; continue */
continue;
else if (!NT_SUCCESS(Result))
return FALSE;
else
{
if (0 != PReparsePointIndex)
*PReparsePointIndex = (ULONG)(lastp - FileName);
return TRUE;
}
/*
* Found a reparse point!
*/
if (0 != PReparsePointIndex)
*PReparsePointIndex = (ULONG)(LastPathComponent - FileName);
return TRUE;
}
return FALSE;
@@ -1102,26 +1108,43 @@ FSP_API NTSTATUS FspFileSystemResolveReparsePoints(FSP_FILE_SYSTEM *FileSystem,
if (L'.' == LastPathComponent[0])
{
if (RemainderPath == LastPathComponent + 1)
{
/* dot */
continue;
ReparseTargetPath = 0;
ReparseTargetPathLength = 0;
NewRemainderPath = LastPathComponent;
while (TargetPath < NewRemainderPath)
{
NewRemainderPath--;
if (L'\\' == *NewRemainderPath)
break;
}
goto reparse;
}
if (L'.' == LastPathComponent[1] && RemainderPath == LastPathComponent + 2)
{
/* dotdot */
RemainderPath = LastPathComponent;
while (TargetPath < RemainderPath)
ReparseTargetPath = 0;
ReparseTargetPathLength = 0;
NewRemainderPath = LastPathComponent;
while (TargetPath < NewRemainderPath)
{
RemainderPath--;
if (L'\\' != *RemainderPath)
NewRemainderPath--;
if (L'\\' != *NewRemainderPath)
break;
}
while (TargetPath < RemainderPath)
while (TargetPath < NewRemainderPath)
{
RemainderPath--;
if (L'\\' == *RemainderPath)
NewRemainderPath--;
if (L'\\' == *NewRemainderPath)
break;
}
continue;
goto reparse;
}
}
@@ -1158,20 +1181,22 @@ FSP_API NTSTATUS FspFileSystemResolveReparsePoints(FSP_FILE_SYSTEM *FileSystem,
ReparseTargetPathLength >= sizeof(WCHAR) && L'\\' == ReparseTargetPath[0])
goto reparse_data_exit;
if (0 == --MaxTries)
return STATUS_REPARSE_POINT_NOT_RESOLVED;
/* if device relative symlink replace whole path; else replace last path component */
NewRemainderPath = ReparseTargetPathLength >= sizeof(WCHAR) && L'\\' == ReparseTargetPath[0] ?
TargetPath : LastPathComponent;
reparse:
if (0 == --MaxTries)
return STATUS_REPARSE_POINT_NOT_RESOLVED;
RemainderPathSize = (lstrlenW(RemainderPath) + 1) * sizeof(WCHAR);
if (NewRemainderPath + (ReparseTargetPathLength + RemainderPathSize) / sizeof(WCHAR) >
TargetPath + *PSize / sizeof(WCHAR))
return STATUS_REPARSE_POINT_NOT_RESOLVED;
/* move remainder path to its new position */
memmove(NewRemainderPath + ReparseTargetPathLength, RemainderPath, RemainderPathSize);
memmove(NewRemainderPath + ReparseTargetPathLength / sizeof(WCHAR),
RemainderPath, RemainderPathSize);
/* copy symlink target */
memcpy(NewRemainderPath, ReparseTargetPath, ReparseTargetPathLength);