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1682f0b760
SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
129 lines
3.9 KiB
C++
129 lines
3.9 KiB
C++
/*
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* Copyright (c) 2019-2020, Jesse Buhagiar <jooster669@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/String.h>
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#include <LibCore/ArgsParser.h>
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#include <ctype.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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constexpr uid_t BASE_UID = 1000;
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constexpr gid_t USERS_GID = 100;
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constexpr const char* DEFAULT_SHELL = "/bin/Shell";
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int main(int argc, char** argv)
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{
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if (pledge("stdio wpath rpath cpath chown", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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const char* home_path = nullptr;
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int uid = 0;
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int gid = USERS_GID;
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bool create_home_dir = false;
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const char* password = "";
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const char* shell = DEFAULT_SHELL;
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const char* gecos = "";
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const char* username = nullptr;
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Core::ArgsParser args_parser;
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args_parser.add_option(home_path, "Home directory for the new user", "home-dir", 'd', "path");
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args_parser.add_option(uid, "User ID (uid) for the new user", "uid", 'u', "uid");
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args_parser.add_option(gid, "Group ID (gid) for the new user", "gid", 'g', "gid");
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args_parser.add_option(password, "Encrypted password of the new user", "password", 'p', "password");
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args_parser.add_option(create_home_dir, "Create home directory if it does not exist", "create-home", 'm');
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args_parser.add_option(shell, "Path to the default shell binary for the new user", "shell", 's', "path-to-shell");
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args_parser.add_option(gecos, "GECOS name of the new user", "gecos", 'n', "general-info");
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args_parser.add_positional_argument(username, "Login user identity (username)", "login");
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args_parser.parse(argc, argv);
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// Let's run a quick sanity check on username
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if (strpbrk(username, "\\/!@#$%^&*()~+=`:\n")) {
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fprintf(stderr, "invalid character in username, %s\n", username);
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return 1;
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}
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// Disallow names starting with _ and -
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if (username[0] == '_' || username[0] == '-' || !isalpha(username[0])) {
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fprintf(stderr, "invalid username, %s\n", username);
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return 1;
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}
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if (uid < 0) {
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fprintf(stderr, "invalid uid %d!\n", uid);
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return 3;
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}
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// First, let's sort out the uid for the user
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if (uid > 0) {
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if (getpwuid(static_cast<uid_t>(uid))) {
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fprintf(stderr, "uid %u already exists!\n", uid);
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return 4;
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}
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} else {
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for (uid = BASE_UID; getpwuid(static_cast<uid_t>(uid)); uid++) {
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}
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}
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if (gid < 0) {
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fprintf(stderr, "invalid gid %d\n", gid);
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return 3;
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}
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FILE* pwfile = fopen("/etc/passwd", "a");
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if (!pwfile) {
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perror("failed to open /etc/passwd");
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return 1;
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}
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String home;
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if (!home_path)
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home = String::formatted("/home/{}", username);
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else
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home = home_path;
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if (create_home_dir) {
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if (mkdir(home.characters(), 0700) < 0) {
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auto saved_errno = errno;
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warnln("Failed to create directory {}: {}", home, strerror(saved_errno));
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return 12;
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}
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if (chown(home.characters(), static_cast<uid_t>(uid), static_cast<gid_t>(gid)) < 0) {
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warnln("Failed to change owner of {} to {}:{}: {}", home, uid, gid, strerror(errno));
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if (rmdir(home.characters()) < 0) {
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warnln("Failed to remove directory {}: {}", home, strerror(errno));
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return 12;
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}
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return 12;
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}
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}
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struct passwd p;
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p.pw_name = const_cast<char*>(username);
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p.pw_passwd = const_cast<char*>(password);
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p.pw_dir = const_cast<char*>(home.characters());
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p.pw_uid = static_cast<uid_t>(uid);
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p.pw_gid = static_cast<gid_t>(gid);
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p.pw_shell = const_cast<char*>(shell);
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p.pw_gecos = const_cast<char*>(gecos);
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if (putpwent(&p, pwfile) < 0) {
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perror("putpwent");
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return 1;
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}
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fclose(pwfile);
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return 0;
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}
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