reactos/base/system/smss/smutil.c

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/*
* PROJECT: ReactOS Windows-Compatible Session Manager
* LICENSE: BSD 2-Clause License
* FILE: base/system/smss/smss.c
* PURPOSE: Main SMSS Code
* PROGRAMMERS: Alex Ionescu
*/
/* INCLUDES *******************************************************************/
#include "smss.h"
#include <ndk/sefuncs.h>
#define NDEBUG
#include <debug.h>
/* GLOBALS ********************************************************************/
//
// Taken from an ASSERT
//
#define VALUE_BUFFER_SIZE (sizeof(KEY_VALUE_PARTIAL_INFORMATION) + 512)
typedef struct _SMP_PRIVILEGE_STATE
{
HANDLE TokenHandle;
PTOKEN_PRIVILEGES OldPrivileges;
PTOKEN_PRIVILEGES NewPrivileges;
UCHAR OldBuffer[1024];
TOKEN_PRIVILEGES NewBuffer;
} SMP_PRIVILEGE_STATE, *PSMP_PRIVILEGE_STATE;
UNICODE_STRING SmpDebugKeyword, SmpASyncKeyword, SmpAutoChkKeyword;
/* FUNCTIONS ******************************************************************/
NTSTATUS
NTAPI
SmpAcquirePrivilege(IN ULONG Privilege,
OUT PVOID *PrivilegeState)
{
PSMP_PRIVILEGE_STATE State;
ULONG Size;
NTSTATUS Status;
/* Assume failure */
*PrivilegeState = NULL;
/* Acquire the state structure to hold everything we need */
State = RtlAllocateHeap(SmpHeap,
0,
sizeof(SMP_PRIVILEGE_STATE) +
sizeof(TOKEN_PRIVILEGES) +
sizeof(LUID_AND_ATTRIBUTES));
if (!State) return STATUS_NO_MEMORY;
/* Open our token */
Status = NtOpenProcessToken(NtCurrentProcess(),
TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY,
&State->TokenHandle);
if (!NT_SUCCESS(Status))
{
/* Fail */
RtlFreeHeap(SmpHeap, 0, State);
return Status;
}
/* Set one privilege in the enabled state */
State->NewPrivileges = &State->NewBuffer;
State->OldPrivileges = (PTOKEN_PRIVILEGES)&State->OldBuffer;
State->NewPrivileges->PrivilegeCount = 1;
State->NewPrivileges->Privileges[0].Luid = RtlConvertUlongToLuid(Privilege);
State->NewPrivileges->Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
/* Adjust the privileges in the token */
Size = sizeof(State->OldBuffer);
Status = NtAdjustPrivilegesToken(State->TokenHandle,
FALSE,
State->NewPrivileges,
Size,
State->OldPrivileges,
&Size);
if (Status == STATUS_BUFFER_TOO_SMALL)
{
/* Our static buffer is not big enough, allocate a bigger one */
State->OldPrivileges = RtlAllocateHeap(SmpHeap, 0, Size);
if (!State->OldPrivileges)
{
/* Out of memory, fail */
Status = STATUS_NO_MEMORY;
goto Quickie;
}
/* Now try again */
Status = NtAdjustPrivilegesToken(State->TokenHandle,
FALSE,
State->NewPrivileges,
Size,
State->OldPrivileges,
&Size);
}
/* Normalize failure code and check for success */
if (Status == STATUS_NOT_ALL_ASSIGNED) Status = STATUS_PRIVILEGE_NOT_HELD;
if (NT_SUCCESS(Status))
{
/* We got the privilege, return */
*PrivilegeState = State;
return STATUS_SUCCESS;
}
Quickie:
/* Check if we used a dynamic buffer */
if (State->OldPrivileges != (PTOKEN_PRIVILEGES)&State->OldBuffer)
{
/* Free it */
RtlFreeHeap(SmpHeap, 0, State->OldPrivileges);
}
/* Close the token handle and free the state structure */
NtClose(State->TokenHandle);
RtlFreeHeap(SmpHeap, 0, State);
return Status;
}
VOID
NTAPI
SmpReleasePrivilege(IN PVOID PrivState)
{
PSMP_PRIVILEGE_STATE State = (PSMP_PRIVILEGE_STATE)PrivState;
/* Adjust the privileges in the token */
NtAdjustPrivilegesToken(State->TokenHandle,
FALSE,
State->OldPrivileges,
0,
NULL,
NULL);
/* Check if we used a dynamic buffer */
if (State->OldPrivileges != (PTOKEN_PRIVILEGES)&State->OldBuffer)
{
/* Free it */
RtlFreeHeap(SmpHeap, 0, State->OldPrivileges);
}
/* Close the token handle and free the state structure */
NtClose(State->TokenHandle);
RtlFreeHeap(SmpHeap, 0, State);
}
NTSTATUS
NTAPI
SmpParseToken(IN PUNICODE_STRING Input,
IN BOOLEAN SecondPass,
OUT PUNICODE_STRING Token)
{
PWCHAR p, pp;
ULONG Length, TokenLength, InputLength;
/* Initialize to NULL to start with */
RtlInitUnicodeString(Token, NULL);
/* Save the input length */
InputLength = Input->Length;
/* If the input string is empty, just return */
if (InputLength == 0) return STATUS_SUCCESS;
/* Parse the buffer until the first character */
p = Input->Buffer;
Length = 0;
while (Length < InputLength)
{
if (*p > L' ' ) break;
++p;
Length += sizeof(WCHAR);
}
/* Are we being called for argument pick-up? */
if (SecondPass)
{
/* Then assume everything else is an argument */
TokenLength = InputLength - Length * sizeof(WCHAR);
pp = (PWSTR)((ULONG_PTR)p + TokenLength);
}
else
{
/* No -- so loop until the next space */
pp = p;
while (Length < InputLength)
{
if (*pp <= L' ' ) break;
++pp;
Length += sizeof(WCHAR);
}
/* Now compute how long this token is, and loop until the next char */
TokenLength = (ULONG_PTR)pp - (ULONG_PTR)p;
while (Length < InputLength)
{
if (*pp > L' ' ) break;
++pp;
Length += sizeof(WCHAR);
}
}
/* Did we find a token? */
if (TokenLength)
{
/* Allocate a buffer for it */
Token->Buffer = RtlAllocateHeap(SmpHeap,
SmBaseTag,
TokenLength + sizeof(UNICODE_NULL));
if (!Token->Buffer) return STATUS_NO_MEMORY;
/* Fill in the unicode string to hold it */
Token->MaximumLength = (USHORT)(TokenLength + sizeof(UNICODE_NULL));
Token->Length = (USHORT)TokenLength;
RtlCopyMemory(Token->Buffer, p, TokenLength);
Token->Buffer[TokenLength / sizeof(WCHAR)] = UNICODE_NULL;
}
/* Modify the input string with the position of where the next token begins */
Input->Length -= (USHORT)((ULONG_PTR)pp - (ULONG_PTR)Input->Buffer);
Input->Buffer = pp;
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
SmpParseCommandLine(IN PUNICODE_STRING CommandLine,
OUT PULONG Flags,
OUT PUNICODE_STRING FileName,
OUT PUNICODE_STRING Directory,
OUT PUNICODE_STRING Arguments)
{
ULONG Length;
UNICODE_STRING EnvString, PathString, CmdLineCopy, Token;
WCHAR PathBuffer[MAX_PATH];
PWCHAR FilePart;
NTSTATUS Status;
UNICODE_STRING FullPathString;
/* Initialize output arguments to NULL */
RtlInitUnicodeString(FileName, NULL);
RtlInitUnicodeString(Arguments, NULL);
if (Directory) RtlInitUnicodeString(Directory, NULL);
/* Check if we haven't yet built a full default path or system root yet */
if (!SmpSystemRoot.Length)
{
/* Initialize it based on shared user data string */
RtlInitUnicodeString(&SmpSystemRoot, SharedUserData->NtSystemRoot);
/* Allocate an empty string for the path */
Length = SmpDefaultLibPath.MaximumLength + SmpSystemRoot.MaximumLength +
sizeof(L"\\system32;");
RtlInitEmptyUnicodeString(&FullPathString,
RtlAllocateHeap(SmpHeap, SmBaseTag, Length),
(USHORT)Length);
if (FullPathString.Buffer)
{
/* Append the root, system32;, and then the current library path */
RtlAppendUnicodeStringToString(&FullPathString, &SmpSystemRoot);
RtlAppendUnicodeToString(&FullPathString, L"\\system32;");
RtlAppendUnicodeStringToString(&FullPathString, &SmpDefaultLibPath);
RtlFreeHeap(SmpHeap, 0, SmpDefaultLibPath.Buffer);
SmpDefaultLibPath = FullPathString;
}
}
/* Consume the command line */
CmdLineCopy = *CommandLine;
while (TRUE)
{
/* Parse the first token and check for modifiers/specifiers */
Status = SmpParseToken(&CmdLineCopy, FALSE, &Token);
if (!(NT_SUCCESS(Status)) || !(Token.Buffer)) return STATUS_UNSUCCESSFUL;
if (!Flags) break;
/* Debug requested? */
if (RtlEqualUnicodeString(&Token, &SmpDebugKeyword, TRUE))
{
/* Convert into a flag */
*Flags |= SMP_DEBUG_FLAG;
}
else if (RtlEqualUnicodeString(&Token, &SmpASyncKeyword, TRUE))
{
/* Asynch requested, convert into a flag */
*Flags |= SMP_ASYNC_FLAG;
}
else if (RtlEqualUnicodeString(&Token, &SmpAutoChkKeyword, TRUE))
{
/* Autochk requested, convert into a flag */
*Flags |= SMP_AUTOCHK_FLAG;
}
else
{
/* No specifier found, keep going */
break;
}
/* Get rid of this token and get the next */
RtlFreeHeap(SmpHeap, 0, Token.Buffer);
}
/* Initialize a string to hold the current path */
RtlInitUnicodeString(&EnvString, L"Path");
Length = PAGE_SIZE;
RtlInitEmptyUnicodeString(&PathString,
RtlAllocateHeap(SmpHeap, SmBaseTag, Length),
(USHORT)Length);
if (!PathString.Buffer)
{
/* Fail if we have no memory for this */
RtlFreeHeap(SmpHeap, 0, Token.Buffer);
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Query the path from the environment */
Status = RtlQueryEnvironmentVariable_U(SmpDefaultEnvironment,
&EnvString,
&PathString);
if (Status == STATUS_BUFFER_TOO_SMALL)
{
/* Our buffer was too small, free it */
RtlFreeHeap(SmpHeap, 0, PathString.Buffer);
/* And allocate one big enough */
Length = PathString.Length + sizeof(UNICODE_NULL);
RtlInitEmptyUnicodeString(&PathString,
RtlAllocateHeap(SmpHeap, SmBaseTag, Length),
(USHORT)Length);
if (!PathString.Buffer)
{
/* Fail if we have no memory for this */
RtlFreeHeap(SmpHeap, 0, Token.Buffer);
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Now try again, this should work */
Status = RtlQueryEnvironmentVariable_U(SmpDefaultEnvironment,
&EnvString,
&PathString);
}
if (!NT_SUCCESS(Status))
{
/* Another failure means that the kernel hasn't passed the path correctly */
DPRINT1("SMSS: %wZ environment variable not defined.\n", &EnvString);
Status = STATUS_OBJECT_NAME_NOT_FOUND;
}
else
{
/* Check if the caller expects any flags out of here */
if (Flags)
{
/* We can return the image not found flag -- so does the image exist */
if (!(RtlDosSearchPath_U(PathString.Buffer,
Token.Buffer,
L".exe",
sizeof(PathBuffer),
PathBuffer,
&FilePart)) &&
!(RtlDosSearchPath_U(SmpDefaultLibPath.Buffer,
Token.Buffer,
L".exe",
sizeof(PathBuffer),
PathBuffer,
&FilePart)))
{
/* It doesn't, let the caller know about it and exit */
*Flags |= SMP_INVALID_PATH;
*FileName = Token;
RtlFreeHeap(SmpHeap, 0, PathString.Buffer);
return STATUS_SUCCESS;
}
}
else
{
/* Caller doesn't want flags, probably wants the image itself */
wcscpy(PathBuffer, Token.Buffer);
}
}
/* Free tokens and such, all that's left is to convert the image name */
RtlFreeHeap(SmpHeap, 0, Token.Buffer);
RtlFreeHeap(SmpHeap, 0, PathString.Buffer);
if (!NT_SUCCESS(Status)) return Status;
/* Convert it and bail out if this failed */
if (!RtlDosPathNameToNtPathName_U(PathBuffer, FileName, NULL, NULL))
{
DPRINT1("SMSS: Unable to translate %ws into an NT File Name\n",
&PathBuffer);
Status = STATUS_OBJECT_PATH_INVALID;
}
if (!NT_SUCCESS(Status)) return Status;
/* Finally, check if the caller also wanted the directory */
if (Directory)
{
/* Is the file a relative name with no directory? */
if (FilePart <= PathBuffer)
{
/* Clear it */
RtlInitUnicodeString(Directory, NULL);
}
else
{
/* There is a directory, and a filename -- separate those two */
*--FilePart = UNICODE_NULL;
RtlCreateUnicodeString(Directory, PathBuffer);
}
}
/* We are done -- move on to the second pass to get the arguments */
return SmpParseToken(&CmdLineCopy, TRUE, Arguments);
}
BOOLEAN
NTAPI
SmpQueryRegistrySosOption(VOID)
{
NTSTATUS Status;
UNICODE_STRING KeyName, ValueName;
OBJECT_ATTRIBUTES ObjectAttributes;
HANDLE KeyHandle;
WCHAR ValueBuffer[VALUE_BUFFER_SIZE];
PKEY_VALUE_PARTIAL_INFORMATION PartialInfo = (PVOID)ValueBuffer;
ULONG Length;
/* Open the key */
RtlInitUnicodeString(&KeyName,
L"\\Registry\\Machine\\System\\CurrentControlSet\\Control");
InitializeObjectAttributes(&ObjectAttributes,
&KeyName,
OBJ_CASE_INSENSITIVE,
NULL,
NULL);
Status = NtOpenKey(&KeyHandle, KEY_READ, &ObjectAttributes);
if (!NT_SUCCESS(Status))
{
DPRINT1("SMSS: can't open control key: 0x%x\n", Status);
return FALSE;
}
/* Query the value */
RtlInitUnicodeString(&ValueName, L"SystemStartOptions");
Status = NtQueryValueKey(KeyHandle,
&ValueName,
KeyValuePartialInformation,
PartialInfo,
sizeof(ValueBuffer),
&Length);
ASSERT(Length < VALUE_BUFFER_SIZE);
NtClose(KeyHandle);
if (!NT_SUCCESS(Status))
{
DPRINT1("SMSS: can't query value key: 0x%x\n", Status);
return FALSE;
}
/* Check if it's set to SOS or sos */
if (!(wcsstr((PWCHAR)PartialInfo->Data, L"SOS")) ||
(wcsstr((PWCHAR)PartialInfo->Data, L"sos")))
{
/* It's not set, return FALSE */
return FALSE;
}
/* It's set, return TRUE */
return TRUE;
}
BOOLEAN
NTAPI
SmpSaveAndClearBootStatusData(OUT PBOOLEAN BootOkay,
OUT PBOOLEAN ShutdownOkay)
{
NTSTATUS Status;
BOOLEAN Value = TRUE;
PVOID BootStatusDataHandle;
/* Assume failure */
*BootOkay = FALSE;
*ShutdownOkay = FALSE;
/* Lock the BSD and fail if we couldn't */
Status = RtlLockBootStatusData(&BootStatusDataHandle);
if (!NT_SUCCESS(Status)) return FALSE;
/* Read the old settings */
RtlGetSetBootStatusData(BootStatusDataHandle,
TRUE,
RtlBsdItemBootGood,
BootOkay,
sizeof(BOOLEAN),
NULL);
RtlGetSetBootStatusData(BootStatusDataHandle,
TRUE,
RtlBsdItemBootShutdown,
ShutdownOkay,
sizeof(BOOLEAN),
NULL);
/* Set new ones indicating we got at least this far */
RtlGetSetBootStatusData(BootStatusDataHandle,
FALSE,
RtlBsdItemBootGood,
&Value,
sizeof(Value),
NULL);
RtlGetSetBootStatusData(BootStatusDataHandle,
FALSE,
RtlBsdItemBootShutdown,
&Value,
sizeof(Value),
NULL);
/* Unlock the BSD and return */
RtlUnlockBootStatusData(BootStatusDataHandle);
return TRUE;
}
VOID
NTAPI
SmpRestoreBootStatusData(IN BOOLEAN BootOkay,
IN BOOLEAN ShutdownOkay)
{
NTSTATUS Status;
PVOID BootState;
/* Lock the BSD */
Status = RtlLockBootStatusData(&BootState);
if (NT_SUCCESS(Status))
{
/* Write the bootokay and bootshudown values */
RtlGetSetBootStatusData(BootState,
FALSE,
RtlBsdItemBootGood,
&BootOkay,
sizeof(BootOkay),
NULL);
RtlGetSetBootStatusData(BootState,
FALSE,
RtlBsdItemBootShutdown,
&ShutdownOkay,
sizeof(ShutdownOkay),
NULL);
/* Unlock the BSD and return */
RtlUnlockBootStatusData(BootState);
}
}