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/*-------------------------------------------------------------------------
*
* win32security.c
* Microsoft Windows Win32 Security Support Functions
*
* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/port/win32security.c
*
*-------------------------------------------------------------------------
*/
#ifndef FRONTEND
#include "postgres.h"
#else
#include "postgres_fe.h"
#endif
static void log_error(const char *fmt,...) pg_attribute_printf(1, 2);
/*
* Utility wrapper for frontend and backend when reporting an error
* message.
*/
static void
log_error(const char *fmt,...)
{
va_list ap;
va_start(ap, fmt);
#ifndef FRONTEND
write_stderr(fmt, ap);
#else
fprintf(stderr, fmt, ap);
#endif
va_end(ap);
}
/*
* 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))
{
log_error(_("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))
{
log_error(_("could not get SID for PowerUsers group: error code %lu\n"),
GetLastError());
exit(1);
}
if (!CheckTokenMembership(NULL, AdministratorsSid, &IsAdministrators) ||
!CheckTokenMembership(NULL, PowerUsersSid, &IsPowerUsers))
{
log_error(_("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) Standard error is not valid (always the case for services, and pg_ctl
* running as a service "passes" that down to postgres,
* c.f. CreateRestrictedProcess())
* 2) We are running as LocalSystem (only used by services)
* 3) 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
* in the backend) 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};
HANDLE stderr_handle;
/* Only check the first time */
if (_is_service != -1)
return _is_service;
/* Check if standard error is not valid */
stderr_handle = GetStdHandle(STD_ERROR_HANDLE);
if (stderr_handle != INVALID_HANDLE_VALUE && stderr_handle != NULL)
{
_is_service = 0;
return _is_service;
}
/* Check if running as 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;
}
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