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/*-------------------------------------------------------------------------
*
* security.c
* Microsoft Windows Win32 Security Support Functions
*
* Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/port/win32/security.c,v 1.4 2004/08/29 05:06:46 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
/*
* Returns nonzero if the current user has administrative privileges,
* or zero if not.
*
* Note: this cannot use ereport() because it's called too early during
* startup.
*/
int
pgwin32_is_admin(void)
{
HANDLE AccessToken;
char *InfoBuffer = NULL;
PTOKEN_GROUPS Groups;
DWORD InfoBufferSize;
PSID AdministratorsSid;
PSID PowerUsersSid;
SID_IDENTIFIER_AUTHORITY NtAuthority = {SECURITY_NT_AUTHORITY};
UINT x;
BOOL success;
if (!OpenProcessToken(GetCurrentProcess(), TOKEN_READ, &AccessToken))
{
write_stderr("failed to open process token: %d\n",
(int) GetLastError());
exit(1);
}
if (GetTokenInformation(AccessToken, TokenGroups, NULL, 0, &InfoBufferSize))
{
write_stderr("failed to get token information - got zero size!\n");
exit(1);
}
if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
{
write_stderr("failed to get token information: %d\n",
(int) GetLastError());
exit(1);
}
InfoBuffer = malloc(InfoBufferSize);
if (!InfoBuffer)
{
write_stderr("failed to allocate %i bytes for token information!\n",
(int) InfoBufferSize);
exit(1);
}
Groups = (PTOKEN_GROUPS) InfoBuffer;
if (!GetTokenInformation(AccessToken, TokenGroups, InfoBuffer,
InfoBufferSize, &InfoBufferSize))
{
write_stderr("failed to get token information: %d\n",
(int) GetLastError());
exit(1);
}
CloseHandle(AccessToken);
if (!AllocateAndInitializeSid(&NtAuthority, 2,
SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0,
0, &AdministratorsSid))
{
write_stderr("failed to get SID for Administrators group: %d\n",
(int) GetLastError());
exit(1);
}
if (!AllocateAndInitializeSid(&NtAuthority, 2,
SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_POWER_USERS, 0, 0, 0, 0, 0,
0, &PowerUsersSid))
{
write_stderr("failed to get SID for PowerUsers group: %d\n",
(int) GetLastError());
exit(1);
}
success = FALSE;
for (x = 0; x < Groups->GroupCount; x++)
{
if (EqualSid(AdministratorsSid, Groups->Groups[x].Sid) ||
EqualSid(PowerUsersSid, Groups->Groups[x].Sid))
{
success = TRUE;
break;
}
}
free(InfoBuffer);
FreeSid(AdministratorsSid);
FreeSid(PowerUsersSid);
return success;
}
/*
* We consider ourselves running as a service if one of the following is
* true:
*
* 1) We are running as Local System (only used by services)
* 2) Our token contains SECURITY_SERVICE_RID (automatically added to the
* process token by the SCM when starting a service)
*
* Return values:
* 0 = Not service
* 1 = Service
* -1 = Error
*
* Note: we can't report errors via either ereport (we're called too early)
* or write_stderr (because that calls this). We are therefore reduced to
* writing directly on stderr, which sucks, but we have few alternatives.
*/
int
pgwin32_is_service(void)
{
static int _is_service = -1;
HANDLE AccessToken;
UCHAR InfoBuffer[1024];
PTOKEN_GROUPS Groups = (PTOKEN_GROUPS) InfoBuffer;
PTOKEN_USER User = (PTOKEN_USER) InfoBuffer;
DWORD InfoBufferSize;
PSID ServiceSid;
PSID LocalSystemSid;
SID_IDENTIFIER_AUTHORITY NtAuthority = {SECURITY_NT_AUTHORITY};
UINT x;
/* Only check the first time */
if (_is_service != -1)
return _is_service;
if (!OpenProcessToken(GetCurrentProcess(), TOKEN_READ, &AccessToken))
{
fprintf(stderr, "failed to open process token: %d\n",
(int) GetLastError());
return -1;
}
/* First check for local system */
if (!GetTokenInformation(AccessToken, TokenUser, InfoBuffer, 1024, &InfoBufferSize))
{
fprintf(stderr, "failed to get token information: %d\n",
(int) GetLastError());
return -1;
}
if (!AllocateAndInitializeSid(&NtAuthority, 1,
SECURITY_LOCAL_SYSTEM_RID, 0, 0, 0, 0, 0, 0, 0,
&LocalSystemSid))
{
fprintf(stderr, "failed to get SID for local system account\n");
CloseHandle(AccessToken);
return -1;
}
if (EqualSid(LocalSystemSid, User->User.Sid))
{
FreeSid(LocalSystemSid);
CloseHandle(AccessToken);
_is_service = 1;
return _is_service;
}
FreeSid(LocalSystemSid);
/* Now check for group SID */
if (!GetTokenInformation(AccessToken, TokenGroups, InfoBuffer, 1024, &InfoBufferSize))
{
fprintf(stderr, "failed to get token information: %d\n",
(int) GetLastError());
return -1;
}
if (!AllocateAndInitializeSid(&NtAuthority, 1,
SECURITY_SERVICE_RID, 0, 0, 0, 0, 0, 0, 0,
&ServiceSid))
{
fprintf(stderr, "failed to get SID for service group\n");
CloseHandle(AccessToken);
return -1;
}
_is_service = 0;
for (x = 0; x < Groups->GroupCount; x++)
{
if (EqualSid(ServiceSid, Groups->Groups[x].Sid))
{
_is_service = 1;
break;
}
}
FreeSid(ServiceSid);
CloseHandle(AccessToken);
return _is_service;
}
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