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/*
* Copyright (c) 2020, Peter Elliott <pelliott@ualberta.ca>
* 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/Types.h>
#include <LibCore/Account.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <LibCore/GetPassword.h>
#include <string.h>
#include <unistd.h>
int main(int argc, char** argv)
{
if (geteuid() != 0) {
warnln("Not running as root :^(");
return 1;
}
if (pledge("stdio wpath rpath cpath tty id", nullptr) < 0) {
perror("pledge");
return 1;
}
if (unveil("/etc/passwd", "rwc") < 0) {
perror("unveil");
return 1;
}
if (unveil("/etc/group", "rwc") < 0) {
perror("unveil");
return 1;
}
if (unveil("/etc/shadow", "rwc") < 0) {
perror("unveil");
return 1;
}
unveil(nullptr, nullptr);
bool del = false;
bool lock = false;
bool unlock = false;
const char* username = nullptr;
auto args_parser = Core::ArgsParser();
args_parser.set_general_help("Modify an account password.");
args_parser.add_option(del, "Delete password", "delete", 'd');
args_parser.add_option(lock, "Lock password", "lock", 'l');
args_parser.add_option(unlock, "Unlock password", "unlock", 'u');
args_parser.add_positional_argument(username, "Username", "username", Core::ArgsParser::Required::No);
args_parser.parse(argc, argv);
uid_t current_uid = getuid();
auto account_or_error = (username)
? Core::Account::from_name(username, Core::Account::OpenPasswdFile::ReadWrite, Core::Account::OpenShadowFile::ReadWrite)
: Core::Account::from_uid(current_uid, Core::Account::OpenPasswdFile::ReadWrite, Core::Account::OpenShadowFile::ReadWrite);
if (account_or_error.is_error()) {
warnln("Core::Account::{}: {}", (username) ? "from_name" : "from_uid", account_or_error.error());
return 1;
}
// Drop privileges after opening all the files through the Core::Account object.
auto gid = getgid();
if (setresgid(gid, gid, gid) < 0) {
perror("setresgid");
return 1;
}
auto uid = getuid();
if (setresuid(uid, uid, uid) < 0) {
perror("setresuid");
return 1;
}
// Make sure /etc/passwd is open and ready for reading, then we can drop a bunch of pledge promises.
setpwent();
if (pledge("stdio tty", nullptr) < 0) {
perror("pledge");
return 1;
}
// target_account is the account we are changing the password of.
auto& target_account = account_or_error.value();
if (current_uid != 0 && current_uid != target_account.uid()) {
warnln("You can't modify passwd for {}", username);
return 1;
}
if (del) {
target_account.delete_password();
} else if (lock) {
target_account.set_password_enabled(false);
} else if (unlock) {
target_account.set_password_enabled(true);
} else {
auto new_password = Core::get_password("New password: ");
if (new_password.is_error()) {
warnln("{}", strerror(new_password.error()));
return 1;
}
target_account.set_password(new_password.value().characters());
}
if (!target_account.sync()) {
perror("Core::Account::Sync");
}
return 0;
}
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