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/*
* Copyright (c) 2019-2020, Jesse Buhagiar <jooster669@gmail.com>
* 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/String.h>
#include <LibCore/ArgsParser.h>
#include <ctype.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
constexpr uid_t BASE_UID = 1000;
constexpr gid_t USERS_GID = 100;
constexpr const char* DEFAULT_SHELL = "/bin/Shell";
int main(int argc, char** argv)
{
const char* home_path = nullptr;
int uid = 0;
int gid = USERS_GID;
bool create_home_dir = false;
const char* password = "";
const char* shell = DEFAULT_SHELL;
const char* gecos = "";
const char* username = nullptr;
Core::ArgsParser args_parser;
args_parser.add_option(home_path, "Home directory for the new user", "home-dir", 'd', "path");
args_parser.add_option(uid, "User ID (uid) for the new user", "uid", 'u', "uid");
args_parser.add_option(gid, "Group ID (gid) for the new user", "gid", 'g', "gid");
args_parser.add_option(password, "Encrypted password of the new user", "password", 'p', "password");
args_parser.add_option(create_home_dir, "Create home directory if it does not exist", "create-home", 'm');
args_parser.add_option(shell, "Path to the default shell binary for the new user", "shell", 's', "path-to-shell");
args_parser.add_option(gecos, "GECOS name of the new user", "gecos", 'n', "general-info");
args_parser.add_positional_argument(username, "Login user identity (username)", "login");
args_parser.parse(argc, argv);
// Let's run a quick sanity check on username
if (strpbrk(username, "\\/!@#$%^&*()~+=`:\n")) {
fprintf(stderr, "invalid character in username, %s\n", username);
return 1;
}
// Disallow names starting with _ and -
if (username[0] == '_' || username[0] == '-' || !isalpha(username[0])) {
fprintf(stderr, "invalid username, %s\n", username);
return 1;
}
if (uid < 0) {
fprintf(stderr, "invalid uid %d!\n", uid);
return 3;
}
// First, let's sort out the uid for the user
if (uid > 0) {
if (getpwuid(static_cast<uid_t>(uid))) {
fprintf(stderr, "uid %u already exists!\n", uid);
return 4;
}
} else {
for (uid = BASE_UID; getpwuid(static_cast<uid_t>(uid)); uid++) {
}
}
if (gid < 0) {
fprintf(stderr, "invalid gid %d\n", gid);
return 3;
}
FILE* pwfile = fopen("/etc/passwd", "a");
if (!pwfile) {
perror("failed to open /etc/passwd");
return 1;
}
String home;
if (!home_path)
home = String::format("/home/%s", username);
else
home = home_path;
if (create_home_dir) {
if (mkdir(home.characters(), 0700) < 0) {
perror(String::format("failed to create directory %s", home.characters()).characters());
return 12;
}
if (chown(home.characters(), static_cast<uid_t>(uid), static_cast<gid_t>(gid)) < 0) {
perror(String::format("failed to chown %s to %u:%u", home.characters(), uid, gid).characters());
if (rmdir(home.characters()) < 0) {
perror(String::format("failed to rmdir %s", home.characters()).characters());
return 12;
}
return 12;
}
}
struct passwd p;
p.pw_name = const_cast<char*>(username);
p.pw_passwd = const_cast<char*>(password);
p.pw_dir = const_cast<char*>(home.characters());
p.pw_uid = static_cast<uid_t>(uid);
p.pw_gid = static_cast<gid_t>(gid);
p.pw_shell = const_cast<char*>(shell);
p.pw_gecos = const_cast<char*>(gecos);
if (putpwent(&p, pwfile) < 0) {
perror("putpwent");
return 1;
}
fclose(pwfile);
return 0;
}
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