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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
*/
#include <AK/Vector.h>
#include <LibCore/Account.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/GetPassword.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
extern "C" int main(int, char**);
int main(int argc, char** argv)
{
if (pledge("stdio rpath tty exec id", nullptr) < 0) {
perror("pledge");
return 1;
}
if (!isatty(STDIN_FILENO)) {
warnln("{}: standard in is not a terminal", argv[0]);
return 1;
}
const char* user = nullptr;
Core::ArgsParser args_parser;
args_parser.add_positional_argument(user, "User to switch to (defaults to user with UID 0)", "user", Core::ArgsParser::Required::No);
args_parser.parse(argc, argv);
if (geteuid() != 0) {
warnln("Not running as root :(");
return 1;
}
auto account_or_error = (user)
? Core::Account::from_name(user, Core::Account::OpenPasswdFile::No, Core::Account::OpenShadowFile::ReadOnly)
: Core::Account::from_uid(0, Core::Account::OpenPasswdFile::No, Core::Account::OpenShadowFile::ReadOnly);
if (account_or_error.is_error()) {
fprintf(stderr, "Core::Account::from_name: %s\n", account_or_error.error().characters());
return 1;
}
if (pledge("stdio tty exec id", nullptr) < 0) {
perror("pledge");
return 1;
}
const auto& account = account_or_error.value();
if (getuid() != 0 && account.has_password()) {
auto password = Core::get_password();
if (password.is_error()) {
warnln("{}", password.error());
return 1;
}
if (!account.authenticate(password.value().characters())) {
warnln("Incorrect or disabled password.");
return 1;
}
}
if (pledge("stdio exec id", nullptr) < 0) {
perror("pledge");
return 1;
}
if (!account.login()) {
perror("Core::Account::login");
return 1;
}
execl(account.shell().characters(), account.shell().characters(), nullptr);
perror("execl");
return 1;
}
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