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// distribution boxbackup-0.11rc2 (svn version: 2072)
//
// Copyright (c) 2003 - 2008
// Ben Summers and contributors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. All use of this software and associated advertising materials must
// display the following acknowledgment:
// This product includes software developed by Ben Summers.
// 4. The names of the Authors may not be used to endorse or promote
// products derived from this software without specific prior written
// permission.
//
// [Where legally impermissible the Authors do not disclaim liability for
// direct physical injury or death caused solely by defects in the software
// unless it is modified by a third party.]
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
//
//
// --------------------------------------------------------------------------
//
// File
// Name: UnixUser.cpp
// Purpose: Interface for managing the UNIX user of the current process
// Created: 21/1/04
//
// --------------------------------------------------------------------------
#include "Box.h"
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "UnixUser.h"
#include "CommonException.h"
#include "MemLeakFindOn.h"
// --------------------------------------------------------------------------
//
// Function
// Name: UnixUser::UnixUser(const char *)
// Purpose: Constructor, initialises to info of given username
// Created: 21/1/04
//
// --------------------------------------------------------------------------
UnixUser::UnixUser(const char *Username)
: mUID(0),
mGID(0),
mRevertOnDestruction(false)
{
// Get password info
struct passwd *pwd = ::getpwnam(Username);
if(pwd == 0)
{
THROW_EXCEPTION(CommonException, CouldNotLookUpUsername)
}
// Store UID and GID
mUID = pwd->pw_uid;
mGID = pwd->pw_gid;
}
// --------------------------------------------------------------------------
//
// Function
// Name: UnixUser::UnixUser(uid_t, gid_t)
// Purpose: Construct from given UNIX user ID and group ID
// Created: 15/3/04
//
// --------------------------------------------------------------------------
UnixUser::UnixUser(uid_t UID, gid_t GID)
: mUID(UID),
mGID(GID),
mRevertOnDestruction(false)
{
}
// --------------------------------------------------------------------------
//
// Function
// Name: UnixUser::~UnixUser()
// Purpose: Destructor -- reverts to previous user if the change wasn't perminant
// Created: 21/1/04
//
// --------------------------------------------------------------------------
UnixUser::~UnixUser()
{
if(mRevertOnDestruction)
{
// Revert to "real" user and group id of the process
if(::setegid(::getgid()) != 0 || ::seteuid(::getuid()) != 0)
{
THROW_EXCEPTION(CommonException, CouldNotRestoreProcessUser)
}
}
}
// --------------------------------------------------------------------------
//
// Function
// Name: UnixUser::ChangeProcessUser(bool)
// Purpose: Change the process user and group ID to the user. If Temporary == true
// the process username will be changed back when the object is destructed.
// Created: 21/1/04
//
// --------------------------------------------------------------------------
void UnixUser::ChangeProcessUser(bool Temporary)
{
if(Temporary)
{
// Change temporarily (change effective only)
if(::setegid(mGID) != 0 || ::seteuid(mUID) != 0)
{
THROW_EXCEPTION(CommonException, CouldNotChangeProcessUser)
}
// Mark for change on destruction
mRevertOnDestruction = true;
}
else
{
// Change permanently (change all UIDs and GIDs)
if(::setgid(mGID) != 0 || ::setuid(mUID) != 0)
{
THROW_EXCEPTION(CommonException, CouldNotChangeProcessUser)
}
}
}
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