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security.c
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security.c
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/*-------------------------------------------------------------------------
*
* security.c
* Microsoft Windows Win32 Security Support Functions
*
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/backend/port/win32/security.c
*
*-------------------------------------------------------------------------
*/
#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)
{
PSID AdministratorsSid;
PSID PowerUsersSid;
SID_IDENTIFIER_AUTHORITY NtAuthority = {SECURITY_NT_AUTHORITY};
BOOL IsAdministrators;
BOOL IsPowerUsers;
if (!AllocateAndInitializeSid(&NtAuthority, 2,
SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0,
0, &AdministratorsSid))
{
write_stderr("could not get SID for Administrators group: error code %lu\n",
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("could not get SID for PowerUsers group: error code %lu\n",
GetLastError());
exit(1);
}
if (!CheckTokenMembership(NULL, AdministratorsSid, &IsAdministrators) ||
!CheckTokenMembership(NULL, PowerUsersSid, &IsPowerUsers))
{
write_stderr("could not check access token membership: error code %lu\n",
GetLastError());
exit(1);
}
FreeSid(AdministratorsSid);
FreeSid(PowerUsersSid);
if (IsAdministrators || IsPowerUsers)
return 1;
else
return 0;
}
/*
* We consider ourselves running as a service if one of the following is
* true:
*
* 1) We are running as LocalSystem (only used by services)
* 2) Our token contains SECURITY_SERVICE_RID (automatically added to the
* process token by the SCM when starting a service)
*
* The check for LocalSystem is needed, because surprisingly, if a service
* is running as LocalSystem, it does not have SECURITY_SERVICE_RID in its
* process token.
*
* 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;
BOOL IsMember;
PSID ServiceSid;
PSID LocalSystemSid;
SID_IDENTIFIER_AUTHORITY NtAuthority = {SECURITY_NT_AUTHORITY};
/* Only check the first time */
if (_is_service != -1)
return _is_service;
/* First check for LocalSystem */
if (!AllocateAndInitializeSid(&NtAuthority, 1,
SECURITY_LOCAL_SYSTEM_RID, 0, 0, 0, 0, 0, 0, 0,
&LocalSystemSid))
{
fprintf(stderr, "could not get SID for local system account\n");
return -1;
}
if (!CheckTokenMembership(NULL, LocalSystemSid, &IsMember))
{
fprintf(stderr, "could not check access token membership: error code %lu\n",
GetLastError());
FreeSid(LocalSystemSid);
return -1;
}
FreeSid(LocalSystemSid);
if (IsMember)
{
_is_service = 1;
return _is_service;
}
/* Check for service group membership */
if (!AllocateAndInitializeSid(&NtAuthority, 1,
SECURITY_SERVICE_RID, 0, 0, 0, 0, 0, 0, 0,
&ServiceSid))
{
fprintf(stderr, "could not get SID for service group: error code %lu\n",
GetLastError());
return -1;
}
if (!CheckTokenMembership(NULL, ServiceSid, &IsMember))
{
fprintf(stderr, "could not check access token membership: error code %lu\n",
GetLastError());
FreeSid(ServiceSid);
return -1;
}
FreeSid(ServiceSid);
if (IsMember)
_is_service = 1;
else
_is_service = 0;
return _is_service;
}