mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 21:42:43 +00:00
c70f45ff44
This commit moves the length calculations out to be directly on the StringView users. This is an important step towards the goal of removing StringView(char const*), as it moves the responsibility of calculating the size of the string to the user of the StringView (which will prevent naive uses causing OOB access).
102 lines
2.7 KiB
C++
102 lines
2.7 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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* Copyright (c) 2021, Maxime Friess <M4x1me@pm.me>
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* Copyright (c) 2022, Umut İnan Erdoğan <umutinanerdogan62@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 <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 <grp.h>
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#include <pwd.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* groupname = nullptr;
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Core::ArgsParser args_parser;
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args_parser.add_positional_argument(groupname, "Group name", "group");
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args_parser.parse(arguments);
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setgrent();
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auto* g = getgrnam(groupname);
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// Check if the group exists
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if (!g) {
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warnln("group {} does not exist", groupname);
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return 6;
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}
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auto gid = g->gr_gid;
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endgrent();
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// Search if the group is the primary group of an user
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setpwent();
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struct passwd* pw;
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for (pw = getpwent(); pw; pw = getpwent()) {
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if (pw->pw_gid == gid)
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break;
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}
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// If pw is not NULL it means we ended prematurely, aka. the group was found as primary group of an user
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if (pw) {
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warnln("cannot remove the primary group of user '{}'", pw->pw_name);
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endpwent();
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return 8;
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}
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endpwent();
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// We can now safely delete the group
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// Create a temporary group file
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char temp_group[] = "/etc/group.XXXXXX";
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StringView temp_group_view { temp_group, strlen(temp_group) };
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auto unlink_temp_files = [&] {
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if (Core::System::unlink(temp_group_view).is_error())
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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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int temp_group_fd = TRY(Core::System::mkstemp(temp_group));
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FILE* temp_group_file = fdopen(temp_group_fd, "w");
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if (!temp_group_file) {
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perror("fdopen");
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return 1;
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}
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setgrent();
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for (auto* gr = getgrent(); gr; gr = getgrent()) {
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if (gr->gr_gid != gid) {
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if (putgrent(gr, temp_group_file) != 0) {
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perror("failed to put an entry in the temporary group file");
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return 1;
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}
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}
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}
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endgrent();
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if (fclose(temp_group_file)) {
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perror("fclose");
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return 1;
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}
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TRY(Core::System::chmod(temp_group_view, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH));
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TRY(Core::System::rename(temp_group_view, "/etc/group"sv));
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unlink_temp_files_guard.disarm();
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return 0;
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}
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