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/*++
Copyright (c) 1993 Microsoft Corporation
Module Name:
ccache.c
Abstract:
This module contains the code to keep a cache of the user
credentials. The cache is used mainly for a user browsing from
winfile.
Author:
Chuck Y Chan (chuckc) 4-Dec-93
Revision History:
chuckc Created
--*/
#include <nwclient.h>
#include <nwcanon.h>
#include <nwapi.h>
//-------------------------------------------------------------------//
// //
// Local Function Prototypes //
// //
//-------------------------------------------------------------------//
DWORD
ExtractServerName(
IN LPWSTR RemoteName,
OUT LPWSTR ServerName,
IN DWORD ServerNameSize
) ;
//-------------------------------------------------------------------//
// //
// Global variables //
// //
//-------------------------------------------------------------------//
static WCHAR CachedPassword[NW_MAX_PASSWORD_LEN+1] ;
static WCHAR CachedUserName[NW_MAX_USERNAME_LEN+1] ;
static WCHAR CachedServerName[NW_MAX_SERVER_LEN+1] ;
static DWORD CachedCredentialsTime ;
static UNICODE_STRING CachedPasswordUnicodeStr ;
static UCHAR EncodeSeed = 0 ;
//-------------------------------------------------------------------//
// //
// Function Bodies //
// //
//-------------------------------------------------------------------//
DWORD
NwpCacheCredentials(
IN LPWSTR RemoteName,
IN LPWSTR UserName,
IN LPWSTR Password
)
/*++
Routine Description:
This function caches the user credentials for the particular
server.
Arguments:
RemoteName - path containg the server we are accessing. only the
server component is of interest.
UserName - user name to remember
Password - password to remember
Return Value:
NO_ERROR - Successfully cached the credentials
Win32 error code otherwise.
--*/
{
DWORD status ;
//
// various paramter checks
//
if (!RemoteName || !UserName || !Password)
{
status = ERROR_INVALID_PARAMETER ;
goto ExitPoint ;
}
if (wcslen(UserName) >= sizeof(CachedUserName)/sizeof(CachedUserName[0]))
{
status = ERROR_INVALID_PARAMETER ;
goto ExitPoint ;
}
if (wcslen(Password) >= sizeof(CachedPassword)/sizeof(CachedPassword[0]))
{
status = ERROR_INVALID_PARAMETER ;
goto ExitPoint ;
}
//
// extract the server portion of the path
//
status = ExtractServerName(
RemoteName,
CachedServerName,
sizeof(CachedServerName)/sizeof(CachedServerName[0])) ;
if (status != NO_ERROR)
{
goto ExitPoint ;
}
//
// save away the credentials
//
wcscpy(CachedUserName, UserName) ;
wcscpy(CachedPassword, Password) ;
//
// encode it since it is in page pool
//
RtlInitUnicodeString(&CachedPasswordUnicodeStr, CachedPassword) ;
RtlRunEncodeUnicodeString(&EncodeSeed, &CachedPasswordUnicodeStr) ;
//
// mark the time this happened
//
CachedCredentialsTime = GetTickCount() ;
return NO_ERROR ;
ExitPoint:
CachedServerName[0] = 0 ;
return status ;
}
BOOL
NwpRetrieveCachedCredentials(
IN LPWSTR RemoteName,
OUT LPWSTR *UserName,
OUT LPWSTR *Password
)
/*++
Routine Description:
This function retrieves the cached user credentials for the particular
server.
Arguments:
RemoteName - path containg the server we are accessing. only the
server component is of interest.
UserName - used to return user name
Password - used to return password
Return Value:
NO_ERROR - Successfully returned at least one entry.
Win32 error code otherwise.
--*/
{
DWORD status ;
DWORD CurrentTime ;
WCHAR ServerName[NW_MAX_SERVER_LEN+1] ;
*UserName = NULL ;
*Password = NULL ;
CurrentTime = GetTickCount() ;
if (!RemoteName)
{
return FALSE ;
}
//
// if too old, bag out
//
if (((CurrentTime > CachedCredentialsTime) &&
(CurrentTime - CachedCredentialsTime) > 60000) ||
((CurrentTime < CachedCredentialsTime) &&
(CurrentTime + (MAXULONG - CachedCredentialsTime)) >= 60000))
{
CachedServerName[0] = 0 ; // reset to nothing
return FALSE ;
}
status = ExtractServerName(
RemoteName,
ServerName,
sizeof(ServerName)/sizeof(ServerName[0])) ;
if (status != NO_ERROR)
{
return FALSE ;
}
//
// if dont compare, bag out
//
if (_wcsicmp(ServerName, CachedServerName) != 0)
{
return FALSE ;
}
//
// allocate memory to return data
//
if (!(*UserName = (LPWSTR) LocalAlloc(
LPTR,
(wcslen(CachedUserName)+1) * sizeof(WCHAR))))
{
return FALSE ;
}
if (!(*Password = (LPWSTR) LocalAlloc(
LPTR,
(wcslen(CachedPassword)+1) * sizeof(WCHAR))))
{
LocalFree((HLOCAL)*UserName) ;
*UserName = NULL ;
return FALSE ;
}
//
// decode the string,copy it and then reencode it
//
RtlRunDecodeUnicodeString(EncodeSeed, &CachedPasswordUnicodeStr) ;
wcscpy(*Password, CachedPassword) ;
RtlRunEncodeUnicodeString(&EncodeSeed, &CachedPasswordUnicodeStr) ;
wcscpy(*UserName, CachedUserName) ;
//
// update the tick count
//
CachedCredentialsTime = GetTickCount() ;
return TRUE ;
}
DWORD
ExtractServerName(
IN LPWSTR RemoteName,
OUT LPWSTR ServerName,
IN DWORD ServerNameSize
)
/*++
Routine Description:
This function extracts the server name out of a remote name
Arguments:
RemoteName - the input string to extract the server name from.
ServerName - the return buffer for the server string
ServerNameSize - size o f buffer in chars
Return Value:
NO_ERROR - Successfully cached the credentials
Win32 error code otherwise.
--*/
{
LPWSTR ServerStart ;
LPWSTR ServerEnd ;
//
// skip initial backslashes, then find next one delimiting the server name
//
ServerStart = RemoteName ;
while (*ServerStart == L'\\')
ServerStart++ ;
ServerEnd = wcschr(ServerStart, L'\\') ;
if (ServerEnd)
*ServerEnd = 0 ;
//
// make sure we can fit
//
if (wcslen(ServerStart) >= ServerNameSize)
{
if (ServerEnd)
*ServerEnd = L'\\' ;
return ERROR_INVALID_PARAMETER ;
}
//
// copy and restore the backslash
//
wcscpy(ServerName, ServerStart) ;
if (ServerEnd)
*ServerEnd = L'\\' ;
return NO_ERROR ;
}
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