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/*
* SLiM - Simple Login Manager
* Copyright (C) 1997, 1998 Per Liden
* Copyright (C) 2004-06 Simone Rota <sip@varlock.com>
* Copyright (C) 2004-06 Johannes Winkelmann <jw@tks6.net>
* Copyright (C) 2022-23 Rob Pearce <slim@flitspace.org.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <unistd.h>
#include <cstdio>
#include <iostream>
#include <grp.h>
#include "const.h"
#include "cfg.h"
#include "log.h"
#include "util.h"
#include "switchuser.h"
using namespace std;
SwitchUser::SwitchUser(struct passwd *pw, Cfg *c, const string& display,
char** _env)
: cfg(c), Pw(pw), env(_env)
{
}
SwitchUser::~SwitchUser()
{
/* Never called */
}
void SwitchUser::Login(const char* cmd, const char* mcookie)
{
SetUserId();
SetClientAuth(mcookie);
Execute(cmd);
}
void SwitchUser::SetUserId()
{
if( (Pw == 0) ||
(initgroups(Pw->pw_name, Pw->pw_gid) != 0) ||
(setgid(Pw->pw_gid) != 0) ||
(setuid(Pw->pw_uid) != 0) ) {
logStream << APPNAME << ": could not switch user id" << endl;
exit(ERR_EXIT);
}
}
void SwitchUser::Execute(const char* cmd)
{
if ( chdir(Pw->pw_dir) < 0 )
logStream << APPNAME << ": unable to chdir() to user's home: " << strerror(errno) << endl;
logStream.closeLog();
execle(Pw->pw_shell, Pw->pw_shell, "-c", cmd, NULL, env);
/// @todo this copy-paste of App:CloseLog() should be cleaned up
if ( !logStream.openLog( cfg->getOption("logfile").c_str() ) ) {
cerr << APPNAME << ": Could not access log file: " << cfg->getOption("logfile") << endl;
exit(ERR_EXIT);
}
logStream << APPNAME << ": could not execute login command: " << strerror(errno) << endl;
}
void SwitchUser::SetClientAuth(const char* mcookie)
{
string home = string(Pw->pw_dir);
string authfile = home + "/.Xauthority";
remove(authfile.c_str());
Util::add_mcookie(mcookie, ":0", cfg->getOption("xauth_path"),
authfile);
}
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