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dll: fuse: FileSecurity option

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This commit is contained in:
Bill Zissimopoulos
2021-01-25 16:54:59 -08:00
parent c5b850be35
commit 9d5efe5f98
7 changed files with 257 additions and 10 deletions
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100
src/shared/ku/posix.c
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@ -41,6 +41,10 @@ FSP_API VOID FspDeleteSid(PSID Sid, NTSTATUS (*CreateFunc)());
FSP_API NTSTATUS FspPosixMapPermissionsToSecurityDescriptor(
UINT32 Uid, UINT32 Gid, UINT32 Mode,
PSECURITY_DESCRIPTOR *PSecurityDescriptor);
FSP_API NTSTATUS FspPosixMergePermissionsToSecurityDescriptor(
UINT32 Uid, UINT32 Gid, UINT32 Mode,
PSECURITY_DESCRIPTOR ExistingSecurityDescriptor,
PSECURITY_DESCRIPTOR *PSecurityDescriptor);
FSP_API NTSTATUS FspPosixMapSecurityDescriptorToPermissions(
PSECURITY_DESCRIPTOR SecurityDescriptor,
PUINT32 PUid, PUINT32 PGid, PUINT32 PMode);
@ -59,6 +63,7 @@ FSP_API VOID FspPosixDecodeWindowsPath(PWSTR WindowsPath, ULONG Size);
#pragma alloc_text(PAGE, FspPosixCreateSid)
#pragma alloc_text(PAGE, FspDeleteSid)
#pragma alloc_text(PAGE, FspPosixMapPermissionsToSecurityDescriptor)
#pragma alloc_text(PAGE, FspPosixMergePermissionsToSecurityDescriptor)
#pragma alloc_text(PAGE, FspPosixMapSecurityDescriptorToPermissions)
#pragma alloc_text(PAGE, FspPosixMapWindowsToPosixPathEx)
#pragma alloc_text(PAGE, FspPosixMapPosixToWindowsPathEx)
@ -898,6 +903,101 @@ lasterror:
goto exit;
}
FSP_API NTSTATUS FspPosixMergePermissionsToSecurityDescriptor(
UINT32 Uid, UINT32 Gid, UINT32 Mode,
PSECURITY_DESCRIPTOR ExistingSecurityDescriptor,
PSECURITY_DESCRIPTOR *PSecurityDescriptor)
{
FSP_KU_CODE;
if (0 == ExistingSecurityDescriptor)
return FspPosixMapPermissionsToSecurityDescriptor(Uid, Gid, Mode, PSecurityDescriptor);
PSID ExistingOwnerSid = 0, ExistingGroupSid = 0;
BOOL Defaulted, ExistingDaclPresent;
PACL ExistingAcl = 0;
PSID OwnerSid = 0, GroupSid = 0;
SECURITY_DESCRIPTOR SecurityDescriptor;
PSECURITY_DESCRIPTOR RelativeSecurityDescriptor = 0;
ULONG Size;
NTSTATUS Result;
*PSecurityDescriptor = 0;
if (!GetSecurityDescriptorOwner(ExistingSecurityDescriptor, &ExistingOwnerSid, &Defaulted))
goto lasterror;
if (!GetSecurityDescriptorGroup(ExistingSecurityDescriptor, &ExistingGroupSid, &Defaulted))
goto lasterror;
if (!GetSecurityDescriptorDacl(ExistingSecurityDescriptor, &ExistingDaclPresent, &ExistingAcl, &Defaulted))
goto lasterror;
if (0 == ExistingOwnerSid)
{
Result = FspPosixMapUidToSid(Uid, &OwnerSid);
if (!NT_SUCCESS(Result))
goto exit;
ExistingOwnerSid = OwnerSid;
}
if (0 == ExistingGroupSid)
{
Result = FspPosixMapUidToSid(Gid, &GroupSid);
if (!NT_SUCCESS(Result))
goto exit;
ExistingGroupSid = GroupSid;
}
if (!InitializeSecurityDescriptor(&SecurityDescriptor, SECURITY_DESCRIPTOR_REVISION))
goto lasterror;
if (!SetSecurityDescriptorOwner(&SecurityDescriptor, ExistingOwnerSid, FALSE))
goto lasterror;
if (!SetSecurityDescriptorGroup(&SecurityDescriptor, ExistingGroupSid, FALSE))
goto lasterror;
if (0 != ExistingAcl)
{
if (!SetSecurityDescriptorControl(&SecurityDescriptor, SE_DACL_PROTECTED, SE_DACL_PROTECTED))
goto lasterror;
if (!SetSecurityDescriptorDacl(&SecurityDescriptor, TRUE, ExistingAcl, FALSE))
goto lasterror;
}
Size = 0;
if (!MakeSelfRelativeSD(&SecurityDescriptor, 0, &Size) &&
ERROR_INSUFFICIENT_BUFFER != GetLastError())
goto lasterror;
RelativeSecurityDescriptor = MemAlloc(Size);
if (0 == RelativeSecurityDescriptor)
{
Result = STATUS_INSUFFICIENT_RESOURCES;
goto exit;
}
if (!MakeSelfRelativeSD(&SecurityDescriptor, RelativeSecurityDescriptor, &Size))
goto lasterror;
*PSecurityDescriptor = RelativeSecurityDescriptor;
Result = STATUS_SUCCESS;
exit:
if (!NT_SUCCESS(Result))
MemFree(RelativeSecurityDescriptor);
if (0 != GroupSid)
FspDeleteSid(GroupSid, FspPosixMapUidToSid);
if (0 != OwnerSid)
FspDeleteSid(OwnerSid, FspPosixMapUidToSid);
return Result;
lasterror:
Result = FspNtStatusFromWin32(GetLastError());
goto exit;
}
static inline ACCESS_MASK FspPosixCanonicalizeAccessMask(ACCESS_MASK AccessMask)
{
PGENERIC_MAPPING Mapping = FspGetFileGenericMapping();