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BUG#: 6037
TITLE: PEP 286 Privilege Separation
DESCRIPTION: Implement privilege separation for the CIM Server.  This allows the CIM Server to run without privilege, using a separate small process to perform privileged operations as necessary.

/*
//%2006////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
// Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
// Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation, The Open Group.
// Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; Symantec Corporation; The Open Group.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
// ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
// "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//%/////////////////////////////////////////////////////////////////////////////
*/
#include <sys/types.h>
#include <pwd.h>
#include "User.h"
#include "Log.h"
#include "Strlcpy.h"

#define PWD_BUFF_SIZE 4096

/*
**==============================================================================
**
** GetUserInfo()
**
**     Lookup the given user's uid and gid.
**
**==============================================================================
*/

int GetUserInfo(const char* user, int* uid, int* gid)
{
    struct passwd pwd;
    char buffer[PWD_BUFF_SIZE];
    struct passwd* ptr = 0;

    if (getpwnam_r(user, &pwd, buffer, PWD_BUFF_SIZE, &ptr) != 0 || !ptr)
    {
        Log(LL_TRACE, "getpwnam_r(%s, ...) failed", user);
        return -1;
    }

    *uid = ptr->pw_uid;
    *gid = ptr->pw_gid;

    return 0;
}

/*
**==============================================================================
**
** GetUserName()
**
**     Lookup the user name for the specified user ID.
**
**==============================================================================
*/

int GetUserName(int uid, char username[EXECUTOR_BUFFER_SIZE])
{
    struct passwd pwd;
    char buffer[PWD_BUFF_SIZE];
    struct passwd* ptr = 0;

    if (getpwuid_r(uid, &pwd, buffer, PWD_BUFF_SIZE, &ptr) != 0 || !ptr)
    {
        Log(LL_TRACE, "getpwuid_r(%d, ...) failed", uid);
        username[0] = '\0';
        return -1;
    }

    Strlcpy(username, ptr->pw_name, EXECUTOR_BUFFER_SIZE);
    return 0;
}