550 lines
16 KiB
C
550 lines
16 KiB
C
/***********************************************************************
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*
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* Copyright (C) 2006 Novell, Inc. All Rights Reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; version 2.1
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* of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, Novell, Inc.
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*
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* To contact Novell about this file by physical or electronic mail,
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* you may find current contact information at www.novell.com.
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*
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* Author: Juan Carlos Luciani <jluciani@novell.com>
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*
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***********************************************************************/
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//===[ Include files ]=====================================================
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#include "internal.h"
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//===[ Type definitions ]==================================================
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//
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// Normalized Host Name Cache Entry definition
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//
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typedef struct _NormalizedHostNameCacheEntry
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{
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LIST_ENTRY listEntry;
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char *pHostName;
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char *pNormalizedHostName;
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int buffLengthRequired;
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} NormalizedHostNameCacheEntry, *PNormalizedHostNameCacheEntry;
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//===[ Function prototypes ]===============================================
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//===[ Global variables ]==================================================
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// Global synchronization mutex for the user
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static
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HANDLE hUserMutex;
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// Normalized host name cache list head
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static
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LIST_ENTRY normalizedHostNameCacheListHead;
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// Synchronization mutex for the normalized host name cache
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static
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HANDLE hNormalizedHostNameCacheMutex;
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// Authentication mechanism configuration file folder
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char mechConfigFolder[] = "\\Program Files\\Novell\\Casa\\Etc\\Auth\\Mechanisms";
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// Path separator
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char pathCharString[] = "\\";
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//++=======================================================================
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CasaStatus
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CreateUserMutex(void)
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//
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// Arguments:
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//
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// Returns:
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//
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// Abstract:
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//
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// Notes:
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//
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// L2
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//=======================================================================--
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{
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CasaStatus retStatus = CASA_STATUS_SUCCESS;
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char *pUsername = NULL;
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DWORD nameLength = 0;
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DbgTrace(1, "-CreateUserMutex- Start\n", 0);
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// Get the size of the buffer required to obtain the user name
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GetUserName(pUsername, &nameLength);
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if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
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{
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// Allocate buffer to hold the user name
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pUsername = (char*) malloc(nameLength);
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if (pUsername)
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{
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// Get the name of the user
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if (GetUserName(pUsername, &nameLength))
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{
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SECURITY_ATTRIBUTES mutexAttributes;
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char mutexName[256];
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// Now lets create a global semaphore for the
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// user and allow its handle to be inherited.
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mutexAttributes.nLength = sizeof(mutexAttributes);
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mutexAttributes.lpSecurityDescriptor = NULL;
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mutexAttributes.bInheritHandle = TRUE;
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if (sprintf(mutexName, "Global\\CASA_Auth_Mutex_%s", pUsername) != -1)
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{
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hUserMutex = CreateMutex(&mutexAttributes,
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FALSE,
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mutexName);
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if (hUserMutex == NULL)
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{
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DbgTrace(0, "-CreateUserMutex- CreteMutex failed, error = %d\n", GetLastError());
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retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
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CASA_FACILITY_AUTHTOKEN,
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CASA_STATUS_UNSUCCESSFUL);
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}
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}
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else
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{
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DbgTrace(0, "-CreateUserMutex- sprintf failed, error = %d\n", GetLastError());
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retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
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CASA_FACILITY_AUTHTOKEN,
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CASA_STATUS_UNSUCCESSFUL);
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}
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}
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else
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{
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DbgTrace(0, "-CreateUserMutex- GetUserName failed, error = %d\n", GetLastError());
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retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
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CASA_FACILITY_AUTHTOKEN,
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CASA_STATUS_UNSUCCESSFUL);
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}
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// Free the buffer allocated to hold the user name
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free(pUsername);
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}
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else
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{
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DbgTrace(0, "-CreateUserMutex- Buffer allocation error\n", 0);
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retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
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CASA_FACILITY_AUTHTOKEN,
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CASA_STATUS_INSUFFICIENT_RESOURCES);
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}
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}
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else
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{
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DbgTrace(0, "-CreateUserMutex- Un-expected GetUserName error, error = %d\n", GetLastError());
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retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
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CASA_FACILITY_AUTHTOKEN,
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CASA_STATUS_UNSUCCESSFUL);
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}
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DbgTrace(1, "-CreateUserMutex- End, retStatus\n", retStatus);
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return retStatus;
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}
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//++=======================================================================
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void
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AcquireUserMutex(void)
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//
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// Arguments:
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//
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// Returns:
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//
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// Abstract:
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//
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// Notes:
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//
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// L2
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//=======================================================================--
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{
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DbgTrace(2, "-AcquireUserMutex- Start\n", 0);
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WaitForSingleObject(hUserMutex, INFINITE);
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DbgTrace(2, "-AcquireUserMutex- End\n", 0);
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}
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//++=======================================================================
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void
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ReleaseUserMutex(void)
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//
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// Arguments:
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//
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// Returns:
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//
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// Abstract:
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//
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// Notes:
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//
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// L2
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//=======================================================================--
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{
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DbgTrace(2, "-ReleaseUserMutex- Start\n", 0);
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if (ReleaseMutex(hUserMutex) == 0)
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{
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DbgTrace(0, "-ReleaseUserMutex- ReleaseMutex failed, error = %d\n", GetLastError());
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}
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DbgTrace(2, "-ReleaseUserMutex- End\n", 0);
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}
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//++=======================================================================
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LIB_HANDLE
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OpenLibrary(
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IN char *pFileName)
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//
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// Arguments:
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//
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// Returns:
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//
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// Abstract:
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//
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// Notes:
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//
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// L2
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//=======================================================================--
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{
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LIB_HANDLE libHandle;
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DbgTrace(1, "-OpenLibrary- Start\n", 0);
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libHandle = LoadLibrary(pFileName);
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if (libHandle == NULL)
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{
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DbgTrace(0, "-OpenLibrary- Not able to load library, error = %d\n", GetLastError());
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}
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DbgTrace(1, "-OpenLibrary- End, handle = %08X\n", libHandle);
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return libHandle;
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}
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//++=======================================================================
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void
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CloseLibrary(
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IN LIB_HANDLE libHandle)
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//
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// Arguments:
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//
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// Returns:
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//
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// Abstract:
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//
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// Notes:
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//
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// L2
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//=======================================================================--
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{
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DbgTrace(1, "-CloseLibrary- Start\n", 0);
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FreeLibrary(libHandle);
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DbgTrace(1, "-CloseLibrary- End\n", 0);
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}
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//++=======================================================================
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void*
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GetFunctionPtr(
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IN LIB_HANDLE libHandle,
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IN char *pFunctionName)
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//
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// Arguments:
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//
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// Returns:
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//
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// Abstract:
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//
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// Notes:
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//
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// L2
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//=======================================================================--
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{
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void *pFuncPtr;
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DbgTrace(1, "-GetFunctionPtr- Start\n", 0);
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pFuncPtr = GetProcAddress(libHandle, pFunctionName);
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if (pFuncPtr == NULL)
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{
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DbgTrace(0, "-GetFunctionPtr- Not able to obtain func ptr, error = %d\n", GetLastError());
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}
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DbgTrace(1, "-GetFunctionPtr- End, pFuncPtr = %08X\n", pFuncPtr);
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return pFuncPtr;
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}
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//++=======================================================================
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char*
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NormalizeHostName(
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IN const char *pHostName)
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//
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// Arguments:
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//
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// Returns:
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//
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// Abstract:
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//
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// Notes:
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//
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// L2
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//=======================================================================--
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{
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char *pNormalizedName = NULL;
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LIST_ENTRY *pListEntry;
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NormalizedHostNameCacheEntry *pEntry = NULL;
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DbgTrace(1, "-NormalizeHostName- Start\n", 0);
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// Obtain our synchronization mutex
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WaitForSingleObject(hNormalizedHostNameCacheMutex, INFINITE);
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// First try to find an entry in the normalized host name cache
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// for the host name provided.
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pListEntry = normalizedHostNameCacheListHead.Flink;
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while (pListEntry != &normalizedHostNameCacheListHead)
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{
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// Get pointer to the entry
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pEntry = CONTAINING_RECORD(pListEntry, NormalizedHostNameCacheEntry, listEntry);
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// Check if the entry is for the host name
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if (strcmp(pHostName, pEntry->pHostName) == 0)
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{
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// This entry corresponds to the given host name
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break;
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}
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else
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{
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// The entry does not correspond to the given host name
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pEntry = NULL;
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}
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// Advance to the next entry
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pListEntry = pListEntry->Flink;
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}
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// Check if we found an entry in our cache for the given host name
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if (pEntry)
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{
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// Entry found, obtain the normalized name from it.
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pNormalizedName = (char*) malloc(pEntry->buffLengthRequired);
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if (pNormalizedName)
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{
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// Copy the normalized name onto the allocated buffer
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strcpy(pNormalizedName, pEntry->pNormalizedHostName);
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}
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else
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{
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DbgTrace(0, "-NormalizeHostName- Buffer allocation error\n", 0);
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}
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}
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else
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{
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// An entry was not found in our cache, create one.
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pEntry = (NormalizedHostNameCacheEntry*) malloc(sizeof(NormalizedHostNameCacheEntry));
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if (pEntry)
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{
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// Zero the entry
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memset(pEntry, 0, sizeof(*pEntry));
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// Allocate a buffer to hold the host name in the entry
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pEntry->pHostName = (char*) malloc(strlen(pHostName) + 1);
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if (pEntry->pHostName)
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{
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struct hostent *pLookupResult;
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struct sockaddr_in sockAddr = {0};
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// Copy the host name given into the allocated buffer
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strcpy(pEntry->pHostName, pHostName);
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// Now try to resolve the normalized name
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pLookupResult = gethostbyname(pHostName);
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if (pLookupResult && pLookupResult->h_addrtype == AF_INET)
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{
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char dnsHostName[NI_MAXHOST];
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// Set up a sockaddr structure
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sockAddr.sin_family = AF_INET;
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sockAddr.sin_addr.S_un.S_addr = *((int*) pLookupResult->h_addr_list[0]);
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// Now try to resolve the name using DNS
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if (getnameinfo((const struct sockaddr*) &sockAddr,
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sizeof(sockAddr),
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dnsHostName,
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sizeof(dnsHostName),
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NULL,
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0,
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NI_NAMEREQD) == 0)
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{
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// We resolved the address to a DNS name, use it as the normalized name.
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pEntry->buffLengthRequired = (int) strlen(dnsHostName) + 1;
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pEntry->pNormalizedHostName = (char*) malloc(pEntry->buffLengthRequired);
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if (pEntry->pNormalizedHostName)
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{
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// Copy the dns name
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strcpy(pEntry->pNormalizedHostName, dnsHostName);
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}
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else
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{
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DbgTrace(0, "-NormalizeHostName- Buffer allocation error\n", 0);
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}
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}
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else
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{
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DbgTrace(0, "-NormalizeHostName- getnameInfo failed, error %d\n", WSAGetLastError());
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// Not able to resolve the name in DNS, just use the host name as
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// the normalized name.
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pEntry->buffLengthRequired = (int) strlen(pHostName) + 1;
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pEntry->pNormalizedHostName = (char*) malloc(pEntry->buffLengthRequired);
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if (pEntry->pNormalizedHostName)
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{
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// Copy the host name
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strcpy(pEntry->pNormalizedHostName, pHostName);
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}
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else
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{
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DbgTrace(0, "-NormalizeHostName- Buffer allocation error\n", 0);
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}
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}
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}
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else
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{
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DbgTrace(0, "-NormalizeHostName- Name resolution failed, error = %d\n", WSAGetLastError());
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}
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}
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else
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{
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DbgTrace(0, "-NormalizeHostName- Buffer allocation error\n", 0);
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// Free the space allocated for the entry
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free(pEntry);
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}
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// Proceed based on whether or not we normalized the name
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if (pEntry->pNormalizedHostName)
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{
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// The name was normalized, save the entry in our cache.
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InsertHeadList(&normalizedHostNameCacheListHead, &pEntry->listEntry);
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// Return the normalized name present in the entry
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pNormalizedName = (char*) malloc(pEntry->buffLengthRequired);
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if (pNormalizedName)
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{
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// Copy the normalized name onto the allocated buffer
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strcpy(pNormalizedName, pEntry->pNormalizedHostName);
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}
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else
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{
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DbgTrace(0, "-NormalizeHostName- Buffer allocation error\n", 0);
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}
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}
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else
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{
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// The host name was not normalized, free allocated resources.
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if (pEntry->pHostName)
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free(pEntry->pHostName);
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free(pEntry);
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}
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}
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else
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{
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DbgTrace(0, "-NormalizeHostName- Buffer allocation error\n", 0);
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}
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}
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// Release our synchronization mutex
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if (ReleaseMutex(hNormalizedHostNameCacheMutex) == 0)
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{
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DbgTrace(0, "-NormalizeHostName- ReleaseMutex failed, error\n", 0);
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}
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DbgTrace(1, "-NormalizeHostName- End, pNormalizedName = %08X\n", pNormalizedName);
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return pNormalizedName;
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}
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//++=======================================================================
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CasaStatus
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InitializeHostNameNormalization(void)
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//
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// Arguments:
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//
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// Returns:
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//
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// Abstract:
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//
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// Notes:
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//
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// L2
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//=======================================================================--
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{
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CasaStatus retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
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CASA_FACILITY_AUTHTOKEN,
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CASA_STATUS_UNSUCCESSFUL);
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int winsockStartupResult;
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WSADATA winsockData;
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DbgTrace(1, "-InitializeHostNameNormalization- Start\n", 0);
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// Initialize winsock
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if ((winsockStartupResult = WSAStartup(MAKEWORD(2,2), &winsockData)) == 0)
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{
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// Initialize the cache list head
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InitializeListHead(&normalizedHostNameCacheListHead);
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// Create a cache mutex only applicable to the current process
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hNormalizedHostNameCacheMutex = CreateMutex(NULL,
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FALSE,
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NULL);
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if (hNormalizedHostNameCacheMutex != NULL)
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{
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retStatus = CASA_STATUS_SUCCESS;
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}
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else
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{
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DbgTrace(0, "-InitializeHostNameNormalization- CreateMutex failed, error = %d\n", GetLastError());
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}
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}
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else
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{
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DbgTrace(0, "-InitializeHostNameNormalization- WSAStartup failed, error = %d\n", winsockStartupResult);
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}
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DbgTrace(1, "-InitializeHostNameNormalization- End, retStatus = %08X\n", retStatus);
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return retStatus;
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}
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//++=======================================================================
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//++=======================================================================
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//++=======================================================================
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