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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 *
109 lines
3.2 KiB
C++
109 lines
3.2 KiB
C++
/*
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* Copyright (c) 2020, Sergey Bugaev <bugaevc@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/StringView.h>
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#include <LibCore/ArgsParser.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 <unistd.h>
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int main(int argc, char** argv)
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{
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int flags = -1;
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uid_t chroot_user = 0;
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gid_t chroot_group = 0;
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const char* path = nullptr;
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const char* program = "/bin/Shell";
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const char* userspec = "0:0";
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Core::ArgsParser args_parser;
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args_parser.set_general_help(
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"Run a program in a chroot sandbox. During execution, the program "
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"sees the given path as '/', and cannot access files outside of it.");
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args_parser.add_positional_argument(path, "New root directory", "path");
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args_parser.add_positional_argument(program, "Program to run", "program", Core::ArgsParser::Required::No);
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Core::ArgsParser::Option userspec_option {
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true,
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"The uid:gid to use",
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"userspec",
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'u',
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"userpec",
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[&userspec](const char* s) {
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Vector<StringView> parts = StringView(s).split_view(':', true);
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if (parts.size() != 2)
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return false;
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userspec = s;
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return true;
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}
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};
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args_parser.add_option(move(userspec_option));
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Core::ArgsParser::Option mount_options {
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true,
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"Mount options",
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"options",
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'o',
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"options",
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[&flags](const char* s) {
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flags = 0;
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Vector<StringView> parts = StringView(s).split_view(',');
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for (auto& part : parts) {
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if (part == "defaults")
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continue;
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else if (part == "nodev")
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flags |= MS_NODEV;
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else if (part == "noexec")
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flags |= MS_NOEXEC;
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else if (part == "nosuid")
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flags |= MS_NOSUID;
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else if (part == "ro")
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flags |= MS_RDONLY;
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else if (part == "remount")
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flags |= MS_REMOUNT;
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else if (part == "bind")
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fprintf(stderr, "Ignoring -o bind, as it doesn't make sense for chroot\n");
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else
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return false;
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}
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return true;
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}
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};
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args_parser.add_option(move(mount_options));
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args_parser.parse(argc, argv);
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if (chroot_with_mount_flags(path, flags) < 0) {
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perror("chroot");
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return 1;
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}
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if (chdir("/") < 0) {
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perror("chdir(/)");
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return 1;
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}
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// Failed parsing will silently fail open (uid=0; gid=0);
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// 0:0 is also the default when no --userspec argument is provided.
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auto parts = String(userspec).split(':', true);
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chroot_user = (uid_t)strtol(parts[0].characters(), nullptr, 10);
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chroot_group = (uid_t)strtol(parts[1].characters(), nullptr, 10);
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if (setresgid(chroot_group, chroot_group, chroot_group)) {
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perror("setgid");
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return 1;
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}
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if (setresuid(chroot_user, chroot_user, chroot_user)) {
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perror("setuid");
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return 1;
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}
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execl(program, program, nullptr);
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perror("execl");
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return 1;
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}
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