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96 lines
2.3 KiB
96 lines
2.3 KiB
/*
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* This file is part of schlimm
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* Copyright (C) 2019-2021 Moritz Strohm <ncc1988@posteo.de>
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* and others (see the AUTHORS file).
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*
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* SLiM - Simple Login Manager
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* Copyright (C) 1997, 1998 Per Liden
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* Copyright (C) 2004-06 Simone Rota <sip@varlock.com>
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* Copyright (C) 2004-06 Johannes Winkelmann <jw@tks6.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include "SwitchUser.h"
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using namespace Schlimm;
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SwitchUser::SwitchUser(
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struct passwd *pw,
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std::shared_ptr<Config> c,
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const std::string& display,
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std::vector<std::string>& env
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)
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: cfg(c),
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Pw(pw),
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displayName(display),
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env(env)
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{
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}
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SwitchUser::~SwitchUser()
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{
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/* Never called */
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//Then why is it defined?
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}
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void SwitchUser::Login(const char* cmd, const char* mcookie)
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{
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this->SetUserId();
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this->SetClientAuth(mcookie);
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this->Execute(cmd);
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}
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void SwitchUser::SetUserId()
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{
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if ((Pw == 0) ||
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(initgroups(Pw->pw_name, Pw->pw_gid) != 0) ||
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(setgid(Pw->pw_gid) != 0) ||
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(setuid(Pw->pw_uid) != 0) ) {
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Log::log("Could not switch user id!");
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exit(ERR_EXIT);
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}
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}
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void SwitchUser::Execute(const char* cmd)
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{
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char** c_env = new char*[this->env.size() + 1];
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if (c_env == nullptr) {
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Log::log("Could not allocate memory for environment variables!");
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}
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size_t i = 0;
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for (auto envvar: this->env) {
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c_env[i] = new char[envvar.size() + 1];
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if (c_env[i] == nullptr) {
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//TODO: throw an exception
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return;
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}
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envvar.copy(c_env[i], envvar.length(), 0);
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i++;
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}
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c_env[i] = nullptr;
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chdir(Pw->pw_dir);
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int result = execle(Pw->pw_shell, Pw->pw_shell, "-c", cmd, NULL, c_env);
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if (result == -1) {
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Log::log("Could not execute login command!");
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}
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}
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void SwitchUser::SetClientAuth(const char* mcookie)
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{
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std::string home = std::string(Pw->pw_dir);
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std::string authfile = home + "/.Xauthority";
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remove(authfile.c_str());
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::Util::add_mcookie(mcookie, ":0", cfg->getOption("xauth_path"), authfile);
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}
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