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windows-nt/Source/XPSP1/NT/termsrv/admtools/c2config/c2funcs/password.c

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/*++
Copyright (c) 1994 Microsoft Corporation
Module Name:
password.c
Abstract:
functions to display & set the password policy for this workstation
Author:
Bob Watson (a-robw)
Revision History:
23 Dec 94
--*/
#include <nt.h>
#include <ntrtl.h>
#include <nturtl.h>
#include <ntsam.h>
#include <windows.h>
#include <tchar.h>
#include <stdlib.h>
#include <stdio.h>
#include <c2dll.h>
#include <c2inc.h>
#include <c2utils.h>
#include "c2funcs.h"
#include "c2funres.h"
// define action codes here. They are only meaningful in the
// context of this module.
#define AC_PW_LENGTH_NOCHANGE 0
#define AC_PW_LENGTH_UPDATE 1
#define SECURE C2DLL_C2
static
LONG
GetWorkstationMinPasswordLength (
)
{
SAM_HANDLE hsamObject;
SAM_HANDLE hsamDomain;
PSID psidDomain;
SAM_ENUMERATE_HANDLE hSamEnum;
PSAM_RID_ENUMERATION pRidEnum;
PVOID pvEnumBuffer;
ULONG ulEnumCount;
LONG lRetPwLen = -1; // init to error value
NTSTATUS ntstat;
PDOMAIN_PASSWORD_INFORMATION pdpiData;
SET_WAIT_CURSOR;
// connect to SAM on this machine
ntstat = SamConnect((PUNICODE_STRING)NULL, &hsamObject,
SAM_SERVER_ALL_ACCESS, (POBJECT_ATTRIBUTES)NULL);
if (ntstat == STATUS_SUCCESS) {
// Ask SAM for the domains on this server.
hSamEnum = 0;
ntstat = SamEnumerateDomainsInSamServer(
hsamObject,
&hSamEnum,
&pvEnumBuffer,
1024,
&ulEnumCount);
if ((ntstat == STATUS_SUCCESS) || (ntstat == STATUS_MORE_ENTRIES)) {
// look up only the first entry
pRidEnum = (PSAM_RID_ENUMERATION) pvEnumBuffer;
// get SID of domain
ntstat = SamLookupDomainInSamServer (
hsamObject,
&pRidEnum->Name,
&psidDomain);
if (ntstat == STATUS_SUCCESS) {
// open handle to this domain
ntstat = SamOpenDomain (
hsamObject,
DOMAIN_EXECUTE,
psidDomain,
&hsamDomain);
if (ntstat == STATUS_SUCCESS) {
// get password policy for this domain
pdpiData = NULL;
ntstat = SamQueryInformationDomain (
hsamDomain,
DomainPasswordInformation,
(PVOID *)&pdpiData);
if (ntstat == STATUS_SUCCESS) {
// evaluate password length here
lRetPwLen = (LONG)pdpiData->MinPasswordLength;
ntstat = SamFreeMemory (pdpiData);
}
// close handle
SamCloseHandle (hsamDomain);
}
}
SamFreeMemory(pvEnumBuffer);
}
SamCloseHandle (hsamObject);
} else {
lRetPwLen = -1;
}
SetLastError (RtlNtStatusToDosError(ntstat));
SET_ARROW_CURSOR;
return lRetPwLen;
}
static
BOOL
SetWorkstationMinPasswordLength (
LONG lMinLength
)
{
SAM_HANDLE hsamObject;
SAM_HANDLE hsamDomain;
PSID psidDomain;
SAM_ENUMERATE_HANDLE hSamEnum;
PSAM_RID_ENUMERATION pRidEnum;
PVOID pvEnumBuffer;
ULONG ulEnumCount;
BOOL bReturn = FALSE; // assume error until everything works
NTSTATUS ntstat;
PDOMAIN_PASSWORD_INFORMATION pdpiData;
SET_WAIT_CURSOR;
// connect to SAM on this machine
if (EnableSecurityPriv()) {
ntstat = SamConnect((PUNICODE_STRING)NULL, &hsamObject,
STANDARD_RIGHTS_WRITE | SAM_SERVER_ALL_ACCESS,
(POBJECT_ATTRIBUTES)NULL);
if (ntstat == STATUS_SUCCESS) {
// Ask SAM for the domains on this server.
hSamEnum = 0;
ntstat = SamEnumerateDomainsInSamServer(
hsamObject,
&hSamEnum,
&pvEnumBuffer,
1024,
&ulEnumCount);
if ((ntstat == STATUS_SUCCESS) || (ntstat == STATUS_MORE_ENTRIES)) {
// look up only the first entry
pRidEnum = (PSAM_RID_ENUMERATION) pvEnumBuffer;
// get SID of domain
ntstat = SamLookupDomainInSamServer (
hsamObject,
&pRidEnum->Name,
&psidDomain);
if (ntstat == STATUS_SUCCESS) {
// open handle to this domain
ntstat = SamOpenDomain (
hsamObject,
STANDARD_RIGHTS_WRITE |
DOMAIN_READ_PASSWORD_PARAMETERS |
DOMAIN_LIST_ACCOUNTS |
DOMAIN_LOOKUP |
DOMAIN_WRITE_PASSWORD_PARAMS,
psidDomain,
&hsamDomain);
if (ntstat == STATUS_SUCCESS) {
// get password policy for this domain
pdpiData = NULL;
ntstat = SamQueryInformationDomain (
hsamDomain,
DomainPasswordInformation,
(PVOID *)&pdpiData);
if (ntstat == STATUS_SUCCESS) {
// evaluate password length here
lMinLength &= 0x000000FF; // make it reallly short
pdpiData->MinPasswordLength = (USHORT)lMinLength;
ntstat = SamSetInformationDomain (
hsamDomain,
DomainPasswordInformation,
(PVOID)pdpiData);
if (ntstat == STATUS_SUCCESS) {
bReturn = TRUE;
}
ntstat = SamFreeMemory (pdpiData);
}
// close handle
SamCloseHandle (hsamDomain);
}
}
SamFreeMemory(pvEnumBuffer);
}
SamCloseHandle (hsamObject);
}
SetLastError (RtlNtStatusToDosError(ntstat));
}
SET_ARROW_CURSOR;
return bReturn;
}
BOOL CALLBACK
C2PasswordLengthDlgProc(
IN HWND hDlg, // window handle of the dialog box
IN UINT message, // type of message
IN WPARAM wParam,
IN LPARAM lParam
)
/*++
Routine Description:
Window procedure for Password Length Dialog Box
Arguments:
Standard DlgProc arguments
ReturnValue:
TRUE the message was handled by this routine
FALSE DefDialogProc should handle the message
--*/
{
static PLONG plNewLength; // save address of caller's data block
DWORD dwLogSetting = 0;
int nButton;
int nState;
LONG lPasswordLength;
TCHAR szPasswordLength[4];
switch (message) {
case WM_INITDIALOG:
// save the pointer to the new value
plNewLength = (PLONG)lParam;
// set the correct radio button
lPasswordLength = GetWorkstationMinPasswordLength();
if (lPasswordLength > 0) {
nButton = IDC_MIN_PASSWORD_LENGTH;
EnableWindow (GetDlgItem(hDlg, IDC_PASSWORD_LENGTH_EDIT), TRUE);
_stprintf (szPasswordLength, TEXT("%2d"), lPasswordLength);
SetDlgItemText (hDlg, IDC_PASSWORD_LENGTH_EDIT, szPasswordLength);
} else {
nButton = IDC_ALLOW_BLANK_PASSWORD;
EnableWindow (GetDlgItem(hDlg, IDC_PASSWORD_LENGTH_EDIT), FALSE);
}
CheckRadioButton (hDlg,
IDC_ALLOW_BLANK_PASSWORD,
IDC_MIN_PASSWORD_LENGTH,
nButton);
// set text limits on edit boxes
SendDlgItemMessage (hDlg, IDC_PASSWORD_LENGTH_EDIT, EM_LIMITTEXT,
(WPARAM)2, 0);
SetFocus (GetDlgItem (hDlg, IDOK)); // set focus to OK Button
return FALSE; // we don't want Windows to set the focus
case WM_COMMAND:
switch (LOWORD(wParam)){
case IDOK:
if (HIWORD(wParam) == BN_CLICKED) {
if (IsDlgButtonChecked (hDlg, IDC_ALLOW_BLANK_PASSWORD) == CHECKED) {
*plNewLength = 0;
EndDialog (hDlg, (int)LOWORD(wParam));
} else {
GetDlgItemText (hDlg, IDC_PASSWORD_LENGTH_EDIT,
szPasswordLength, 4);
lPasswordLength = _tcstol(szPasswordLength, NULL, 10);
// make sure it's a valid length
if ((lPasswordLength > 0) && (lPasswordLength <= 14)) {
*plNewLength = lPasswordLength;
// then there's text so exit
EndDialog (hDlg, (int)LOWORD(wParam));
} else {
// an incorrect entry is in the edit box so display message
MessageBeep (MB_ICONASTERISK);
DisplayDllMessageBox (hDlg,
IDS_PASSWORD_INVALID_LEN,
IDS_PASSWORD_CAPTION,
MBOK_INFO);
SetFocus (GetDlgItem (hDlg, IDC_PASSWORD_LENGTH_EDIT));
}
}
return TRUE;
} else {
return FALSE;
}
case IDCANCEL:
if (HIWORD(wParam) == BN_CLICKED) {
// exit and return button that caused exit
EndDialog (hDlg, (int)LOWORD(wParam));
return TRUE;
} else {
return FALSE;
}
case IDC_C2:
if (HIWORD(wParam) == BN_CLICKED) {
nState = ENABLED;
CheckRadioButton (hDlg,
IDC_ALLOW_BLANK_PASSWORD,
IDC_MIN_PASSWORD_LENGTH,
IDC_MIN_PASSWORD_LENGTH);
// en/disable edit windows
EnableWindow (GetDlgItem(hDlg,
IDC_PASSWORD_LENGTH_EDIT), TRUE);
// if there is no text in both of the edit fields
// then display information message
lPasswordLength = SendDlgItemMessage (hDlg, IDC_PASSWORD_LENGTH_EDIT,
WM_GETTEXTLENGTH, 0, 0);
if (lPasswordLength == 0) {
// no value so use 6 for starters
SetDlgItemText (hDlg, IDC_PASSWORD_LENGTH_EDIT,
TEXT("6"));
SetFocus (GetDlgItem (hDlg, IDC_PASSWORD_LENGTH_EDIT));
}
return TRUE;
} else {
return FALSE;
}
case IDC_ALLOW_BLANK_PASSWORD:
case IDC_MIN_PASSWORD_LENGTH:
// check correct button
CheckRadioButton (hDlg,
IDC_ALLOW_BLANK_PASSWORD,
IDC_MIN_PASSWORD_LENGTH,
LOWORD(wParam));
// enable or disable the edit window
if (LOWORD(wParam) == IDC_MIN_PASSWORD_LENGTH) {
nState = ENABLED;
} else {
nState = DISABLED;
}
EnableWindow (GetDlgItem(hDlg,
IDC_PASSWORD_LENGTH_EDIT), nState);
return TRUE;
case IDC_HELP:
PostMessage (GetParent(hDlg), UM_SHOW_CONTEXT_HELP, 0, 0);
return TRUE;
default:
return FALSE;
}
default:
return (FALSE); // Didn't process the message
}
}
LONG
C2QueryPasswordLength (
IN LPARAM lParam
)
/*++
Routine Description:
Function called to find out the current state of this configuration
item. This function reads the current state of the item and
sets the C2 Compliance flag and the Status string to reflect
the current value of the configuration item.
Arguments:
Pointer to the Dll data block passed as an LPARAM.
ReturnValue:
ERROR_SUCCESS if the function succeeds otherwise a
WIN32 error is returned if an error occurs
--*/
{
PC2DLL_DATA pC2Data;
LONG lPasswordLength;
if (lParam != 0) {
pC2Data = (PC2DLL_DATA)lParam;
lPasswordLength = GetWorkstationMinPasswordLength();
if (lPasswordLength > 0) {
pC2Data->lC2Compliance = SECURE;
_stprintf (pC2Data->szStatusName,
GetStringResource (GetDllInstance(), IDS_PASSWORD_NOT_BLANK),
lPasswordLength);
} else if (lPasswordLength == 0) {
pC2Data->lC2Compliance = C2DLL_NOT_SECURE;
_stprintf (pC2Data->szStatusName,
GetStringResource (GetDllInstance(), IDS_PASSWORD_CAN_BE_BLANK));
} else {
pC2Data->lC2Compliance = C2DLL_NOT_SECURE;
_stprintf (pC2Data->szStatusName,
GetStringResource (GetDllInstance(), IDS_UNABLE_READ));
}
} else {
return ERROR_BAD_ARGUMENTS;
}
return ERROR_SUCCESS;
}
LONG
C2SetPasswordLength (
IN LPARAM lParam
)
/*++
Routine Description:
Function called to change the current state of this configuration
item based on an action code passed in the DLL data block. If
this function successfully sets the state of the configuration
item, then the C2 Compliance flag and the Status string to reflect
the new value of the configuration item.
Arguments:
Pointer to the Dll data block passed as an LPARAM.
ReturnValue:
ERROR_SUCCESS if the function succeeds otherwise a
WIN32 error is returned if an error occurs
--*/
{
PC2DLL_DATA pC2Data;
LONG lPasswordLength = 0;
if (lParam != 0) {
pC2Data = (PC2DLL_DATA)lParam;
if (pC2Data->lActionCode == AC_PW_LENGTH_UPDATE) {
if (SetWorkstationMinPasswordLength (pC2Data->lActionValue)) {
lPasswordLength = pC2Data->lActionValue;
if (lPasswordLength > 0) {
pC2Data->lC2Compliance = SECURE;
_stprintf (pC2Data->szStatusName,
GetStringResource (GetDllInstance(), IDS_PASSWORD_NOT_BLANK),
lPasswordLength);
} else {
pC2Data->lC2Compliance = C2DLL_NOT_SECURE;
_stprintf (pC2Data->szStatusName,
GetStringResource (GetDllInstance(), IDS_PASSWORD_CAN_BE_BLANK));
}
} else {
DisplayDllMessageBox (
pC2Data->hWnd,
IDS_PASSWORD_ERROR_NO_SET,
IDS_PASSWORD_CAPTION,
MBOK_EXCLAIM);
}
pC2Data->lActionCode = 0;
pC2Data->lActionValue = 0;
}
} else {
return ERROR_BAD_ARGUMENTS;
}
return ERROR_SUCCESS;
}
LONG
C2DisplayPasswordLength (
IN LPARAM lParam
)
/*++
Routine Description:
Function called to display more information on the configuration
item and provide the user with the option to change the current
setting (if appropriate). If the User "OK's" out of the UI,
then the action code field in the DLL data block is set to the
appropriate (and configuration item-specific) action code so the
"Set" function can be called to perform the desired action. If
the user Cancels out of the UI, then the Action code field is
set to 0 (no action) and no action is performed.
Arguments:
Pointer to the Dll data block passed as an LPARAM.
ReturnValue:
ERROR_SUCCESS if the function succeeds otherwise a
WIN32 error is returned if an error occurs
--*/
{
PC2DLL_DATA pC2Data;
LONG lNewValue = 0;
if (lParam != 0) {
pC2Data = (PC2DLL_DATA)lParam;
if (DialogBoxParam (
GetDllInstance(),
MAKEINTRESOURCE (IDD_PASSWORD_LENGTH),
pC2Data->hWnd,
C2PasswordLengthDlgProc,
(LPARAM)&lNewValue) == IDOK) {
pC2Data->lActionValue = lNewValue;
pC2Data->lActionCode = AC_PW_LENGTH_UPDATE;
} else {
// no action
pC2Data->lActionCode = AC_PW_LENGTH_NOCHANGE;
}
} else {
return ERROR_BAD_ARGUMENTS;
}
return ERROR_SUCCESS;
}


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