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[DHCPCSVC] Set up a security descriptor for DHCP named pipe

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George Bișoc 2022-02-20 20:31:33 +01:00
parent d862fa6fc8
commit eccae203e0
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GPG key ID: 688C4FBE25D7DEF6
1 changed files with 252 additions and 1 deletions
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253
base/services/dhcpcsvc/dhcp/pipe.c
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@ -36,6 +36,243 @@ DWORD PipeSend( HANDLE CommPipe, COMM_DHCP_REPLY *Reply ) {
return Success ? Written : -1;
}
/**
* @brief
* Creates a security descriptor for the DHCP pipe
* service.
*
* @param[out] SecurityDescriptor
* A pointer to an allocated security descriptor
* for the DHCP pipe.
*
* @return
* ERROR_SUCCESS is returned if the function has
* successfully created the descriptor otherwise
* a Win32 error code is returned.
*
* @remarks
* Both admins and local system are given full power
* over the DHCP pipe whereas authenticated users
* and network operators can only read over this pipe.
* They can also execute it.
*/
DWORD CreateDhcpPipeSecurity( PSECURITY_DESCRIPTOR *SecurityDescriptor ) {
DWORD ErrCode;
PACL Dacl;
ULONG DaclSize, RelSDSize = 0;
PSECURITY_DESCRIPTOR AbsSD = NULL, RelSD = NULL;
PSID AuthenticatedUsersSid = NULL, NetworkOpsSid = NULL, AdminsSid = NULL, SystemSid = NULL;
static SID_IDENTIFIER_AUTHORITY NtAuthority = {SECURITY_NT_AUTHORITY};
if (!AllocateAndInitializeSid(&NtAuthority,
1,
SECURITY_AUTHENTICATED_USER_RID,
0, 0, 0, 0, 0, 0, 0,
&AuthenticatedUsersSid))
{
DPRINT1("CreateDhcpPipeSecurity(): Failed to create Authenticated Users SID (error code %d)\n", GetLastError());
return GetLastError();
}
if (!AllocateAndInitializeSid(&NtAuthority,
2,
SECURITY_BUILTIN_DOMAIN_RID,
DOMAIN_ALIAS_RID_NETWORK_CONFIGURATION_OPS,
0, 0, 0, 0, 0, 0,
&NetworkOpsSid))
{
DPRINT1("CreateDhcpPipeSecurity(): Failed to create Network Ops SID (error code %d)\n", GetLastError());
ErrCode = GetLastError();
goto Quit;
}
if (!AllocateAndInitializeSid(&NtAuthority,
2,
SECURITY_BUILTIN_DOMAIN_RID,
DOMAIN_ALIAS_RID_ADMINS,
0, 0, 0, 0, 0, 0,
&AdminsSid))
{
DPRINT1("CreateDhcpPipeSecurity(): Failed to create Admins SID (error code %d)\n", GetLastError());
ErrCode = GetLastError();
goto Quit;
}
if (!AllocateAndInitializeSid(&NtAuthority,
1,
SECURITY_LOCAL_SYSTEM_RID,
0, 0, 0, 0, 0, 0, 0,
&SystemSid))
{
DPRINT1("CreateDhcpPipeSecurity(): Failed to create Local System SID (error code %d)\n", GetLastError());
ErrCode = GetLastError();
goto Quit;
}
AbsSD = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(SECURITY_DESCRIPTOR));
if (!AbsSD)
{
DPRINT1("CreateDhcpPipeSecurity(): Failed to allocate absolute security descriptor!\n");
ErrCode = ERROR_OUTOFMEMORY;
goto Quit;
}
if (!InitializeSecurityDescriptor(AbsSD, SECURITY_DESCRIPTOR_REVISION))
{
DPRINT1("CreateDhcpPipeSecurity(): Failed to initialize absolute security descriptor (error code %d)\n", GetLastError());
ErrCode = GetLastError();
goto Quit;
}
DaclSize = sizeof(ACL) +
sizeof(ACCESS_ALLOWED_ACE) + GetLengthSid(AuthenticatedUsersSid) +
sizeof(ACCESS_ALLOWED_ACE) + GetLengthSid(NetworkOpsSid) +
sizeof(ACCESS_ALLOWED_ACE) + GetLengthSid(AdminsSid) +
sizeof(ACCESS_ALLOWED_ACE) + GetLengthSid(SystemSid);
Dacl = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, DaclSize);
if (!Dacl)
{
DPRINT1("CreateDhcpPipeSecurity(): Failed to allocate DACL!\n");
ErrCode = ERROR_OUTOFMEMORY;
goto Quit;
}
if (!InitializeAcl(Dacl, DaclSize, ACL_REVISION))
{
DPRINT1("CreateDhcpPipeSecurity(): Failed to initialize DACL (error code %d)\n", GetLastError());
ErrCode = GetLastError();
goto Quit;
}
if (!AddAccessAllowedAce(Dacl,
ACL_REVISION,
GENERIC_READ | GENERIC_EXECUTE,
AuthenticatedUsersSid))
{
DPRINT1("CreateDhcpPipeSecurity(): Failed to set up ACE for Authenticated Users SID (error code %d)\n", GetLastError());
ErrCode = GetLastError();
goto Quit;
}
if (!AddAccessAllowedAce(Dacl,
ACL_REVISION,
GENERIC_READ | GENERIC_EXECUTE,
NetworkOpsSid))
{
DPRINT1("CreateDhcpPipeSecurity(): Failed to set up ACE for Network Ops SID (error code %d)\n", GetLastError());
ErrCode = GetLastError();
goto Quit;
}
if (!AddAccessAllowedAce(Dacl,
ACL_REVISION,
GENERIC_ALL,
AdminsSid))
{
DPRINT1("CreateDhcpPipeSecurity(): Failed to set up ACE for Admins SID (error code %d)\n", GetLastError());
ErrCode = GetLastError();
goto Quit;
}
if (!AddAccessAllowedAce(Dacl,
ACL_REVISION,
GENERIC_ALL,
SystemSid))
{
DPRINT1("CreateDhcpPipeSecurity(): Failed to set up ACE for Local System SID (error code %d)\n", GetLastError());
ErrCode = GetLastError();
goto Quit;
}
if (!SetSecurityDescriptorDacl(AbsSD, TRUE, Dacl, FALSE))
{
DPRINT1("CreateDhcpPipeSecurity(): Failed to set up DACL to absolute security descriptor (error code %d)\n", GetLastError());
ErrCode = GetLastError();
goto Quit;
}
if (!SetSecurityDescriptorOwner(AbsSD, AdminsSid, FALSE))
{
DPRINT1("CreateDhcpPipeSecurity(): Failed to set up owner to absolute security descriptor (error code %d)\n", GetLastError());
ErrCode = GetLastError();
goto Quit;
}
if (!SetSecurityDescriptorGroup(AbsSD, SystemSid, FALSE))
{
DPRINT1("CreateDhcpPipeSecurity(): Failed to set up group to absolute security descriptor (error code %d)\n", GetLastError());
ErrCode = GetLastError();
goto Quit;
}
if (!MakeSelfRelativeSD(AbsSD, NULL, &RelSDSize) && GetLastError() != ERROR_INSUFFICIENT_BUFFER)
{
DPRINT1("CreateDhcpPipeSecurity(): Unexpected error code (error code %d -- must be ERROR_INSUFFICIENT_BUFFER)\n", GetLastError());
ErrCode = GetLastError();
goto Quit;
}
RelSD = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, RelSDSize);
if (RelSD == NULL)
{
DPRINT1("CreateDhcpPipeSecurity(): Failed to allocate relative SD!\n");
ErrCode = ERROR_OUTOFMEMORY;
goto Quit;
}
if (!MakeSelfRelativeSD(AbsSD, RelSD, &RelSDSize) && GetLastError() == ERROR_INSUFFICIENT_BUFFER)
{
DPRINT1("CreateDhcpPipeSecurity(): Failed to allocate relative SD, buffer too smal (expected size %lu)\n", RelSDSize);
ErrCode = ERROR_INSUFFICIENT_BUFFER;
goto Quit;
}
*SecurityDescriptor = RelSD;
ErrCode = ERROR_SUCCESS;
Quit:
if (ErrCode != ERROR_SUCCESS)
{
if (RelSD)
{
HeapFree(GetProcessHeap(), 0, RelSD);
}
}
if (AuthenticatedUsersSid)
{
FreeSid(AuthenticatedUsersSid);
}
if (NetworkOpsSid)
{
FreeSid(NetworkOpsSid);
}
if (AdminsSid)
{
FreeSid(AdminsSid);
}
if (SystemSid)
{
FreeSid(SystemSid);
}
if (Dacl)
{
HeapFree(GetProcessHeap(), 0, Dacl);
}
if (AbsSD)
{
HeapFree(GetProcessHeap(), 0, AbsSD);
}
return ErrCode;
}
DWORD WINAPI PipeThreadProc( LPVOID Parameter ) {
DWORD BytesRead;
COMM_DHCP_REQ Req;
@ -45,9 +282,22 @@ DWORD WINAPI PipeThreadProc( LPVOID Parameter ) {
HANDLE CommPipe;
OVERLAPPED Overlapped = {0};
DWORD dwError;
SECURITY_ATTRIBUTES SecurityAttributes;
PSECURITY_DESCRIPTOR DhcpPipeSD = NULL;
DPRINT("PipeThreadProc(%p)\n", Parameter);
dwError = CreateDhcpPipeSecurity(&DhcpPipeSD);
if (dwError != ERROR_SUCCESS)
{
DbgPrint("DHCP: Could not create security descriptor for pipe\n");
return FALSE;
}
SecurityAttributes.nLength = sizeof(SECURITY_ATTRIBUTES);
SecurityAttributes.lpSecurityDescriptor = DhcpPipeSD;
SecurityAttributes.bInheritHandle = FALSE;
CommPipe = CreateNamedPipeW
( DHCP_PIPE_NAME,
PIPE_ACCESS_DUPLEX | FILE_FLAG_FIRST_PIPE_INSTANCE | FILE_FLAG_OVERLAPPED,
@ -56,7 +306,8 @@ DWORD WINAPI PipeThreadProc( LPVOID Parameter ) {
COMM_PIPE_OUTPUT_BUFFER,
COMM_PIPE_INPUT_BUFFER,
COMM_PIPE_DEFAULT_TIMEOUT,
NULL );
&SecurityAttributes );
HeapFree(GetProcessHeap(), 0, DhcpPipeSD);
if (CommPipe == INVALID_HANDLE_VALUE)
{
DbgPrint("DHCP: Could not create named pipe\n");