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Each of these strings would previously rely on StringView's char const* constructor overload, which would call __builtin_strlen on the string. Since we now have operator ""sv, we can replace these with much simpler versions. This opens the door to being able to remove StringView(char const*). No functional changes.
182 lines
4.9 KiB
C++
182 lines
4.9 KiB
C++
/*
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* Copyright (c) 2020, Fei Wu <f.eiwu@yahoo.com>
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* Copyright (c) 2021, Brandon Pruitt <brapru@pm.me>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/ScopeGuard.h>
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#include <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <LibCore/Account.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/File.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <errno.h>
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#include <pwd.h>
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#include <shadow.h>
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#include <spawn.h>
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#include <stdio.h>
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#include <stdlib.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 <sys/wait.h>
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#include <unistd.h>
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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TRY(Core::System::pledge("stdio wpath rpath cpath fattr proc exec"));
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TRY(Core::System::unveil("/etc/", "rwc"));
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TRY(Core::System::unveil("/bin/rm", "x"));
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char const* username = nullptr;
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bool remove_home = false;
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Core::ArgsParser args_parser;
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args_parser.add_option(remove_home, "Remove home directory", "remove", 'r');
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args_parser.add_positional_argument(username, "Login user identity (username)", "login");
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args_parser.parse(arguments);
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auto account_or_error = Core::Account::from_name(username);
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if (account_or_error.is_error()) {
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warnln("Core::Account::from_name: {}", account_or_error.error());
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return 1;
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}
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auto& target_account = account_or_error.value();
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if (remove_home) {
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TRY(Core::System::unveil(target_account.home_directory(), "c"sv));
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} else {
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TRY(Core::System::pledge("stdio wpath rpath cpath fattr"));
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}
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TRY(Core::System::unveil(nullptr, nullptr));
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char temp_passwd[] = "/etc/passwd.XXXXXX";
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char temp_shadow[] = "/etc/shadow.XXXXXX";
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auto unlink_temp_files = [&] {
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if (unlink(temp_passwd) < 0)
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perror("unlink");
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if (unlink(temp_shadow) < 0)
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perror("unlink");
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};
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ArmedScopeGuard unlink_temp_files_guard = [&] {
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unlink_temp_files();
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};
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auto temp_passwd_fd = mkstemp(temp_passwd);
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if (temp_passwd_fd == -1) {
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perror("failed to create temporary passwd file");
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return 1;
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}
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auto temp_shadow_fd = mkstemp(temp_shadow);
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if (temp_shadow_fd == -1) {
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perror("failed to create temporary shadow file");
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return 1;
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}
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FILE* temp_passwd_file = fdopen(temp_passwd_fd, "w");
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if (!temp_passwd_file) {
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perror("fdopen");
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return 1;
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}
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FILE* temp_shadow_file = fdopen(temp_shadow_fd, "w");
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if (!temp_shadow_file) {
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perror("fdopen");
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return 1;
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}
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setpwent();
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for (auto* pw = getpwent(); pw; pw = getpwent()) {
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if (strcmp(pw->pw_name, target_account.username().characters())) {
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if (putpwent(pw, temp_passwd_file) != 0) {
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perror("failed to put an entry in the temporary passwd file");
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return 1;
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}
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}
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}
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endpwent();
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setspent();
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for (auto* spwd = getspent(); spwd; spwd = getspent()) {
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if (strcmp(spwd->sp_namp, target_account.username().characters())) {
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if (putspent(spwd, temp_shadow_file) != 0) {
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perror("failed to put an entry in the temporary shadow file");
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return 1;
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}
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}
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}
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endspent();
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if (fclose(temp_passwd_file)) {
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perror("fclose");
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return 1;
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}
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if (fclose(temp_shadow_file)) {
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perror("fclose");
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return 1;
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}
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if (chmod(temp_passwd, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) {
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perror("chmod");
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return 1;
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}
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if (chmod(temp_shadow, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) {
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perror("chmod");
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return 1;
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}
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if (rename(temp_passwd, "/etc/passwd") < 0) {
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perror("failed to rename the temporary passwd file");
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return 1;
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}
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if (rename(temp_shadow, "/etc/shadow") < 0) {
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perror("failed to rename the temporary shadow file");
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return 1;
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}
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unlink_temp_files_guard.disarm();
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if (remove_home) {
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if (access(target_account.home_directory().characters(), F_OK) == -1)
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return 0;
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String real_path = Core::File::real_path_for(target_account.home_directory());
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if (real_path == "/") {
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warnln("home directory is /, not deleted!");
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return 12;
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}
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pid_t child;
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char const* argv[] = { "rm", "-r", target_account.home_directory().characters(), nullptr };
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if ((errno = posix_spawn(&child, "/bin/rm", nullptr, nullptr, const_cast<char**>(argv), environ))) {
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perror("posix_spawn");
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return 12;
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}
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int wstatus;
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if (waitpid(child, &wstatus, 0) < 0) {
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perror("waitpid");
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return 12;
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}
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if (WEXITSTATUS(wstatus)) {
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warnln("failed to remove the home directory");
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return 12;
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}
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}
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return 0;
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}
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