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88 lines
2.7 KiB
C++
88 lines
2.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Vector.h>
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#include <alloca.h>
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#include <grp.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 <unistd.h>
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extern "C" int main(int, char**);
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int main(int argc, char** argv)
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{
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uid_t uid = 0;
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gid_t gid = 0;
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struct passwd* pwd = nullptr;
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if (argc > 1) {
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pwd = getpwnam(argv[1]);
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if (!pwd) {
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fprintf(stderr, "No such user: %s\n", argv[1]);
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return 1;
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}
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uid = pwd->pw_uid;
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gid = pwd->pw_gid;
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}
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if (!pwd)
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pwd = getpwuid(0);
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if (!pwd) {
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fprintf(stderr, "No passwd entry.\n");
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return 1;
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}
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Vector<gid_t> extra_gids;
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for (auto* group = getgrent(); group; group = getgrent()) {
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for (size_t i = 0; group->gr_mem[i]; ++i) {
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if (!strcmp(pwd->pw_name, group->gr_mem[i]))
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extra_gids.append(group->gr_gid);
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}
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}
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endgrent();
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int rc = setgroups(extra_gids.size(), extra_gids.data());
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if (rc < 0) {
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perror("setgroups");
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return 1;
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}
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rc = setgid(gid);
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if (rc < 0) {
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perror("setgid");
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return 1;
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}
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rc = setuid(uid);
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if (rc < 0) {
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perror("setuid");
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return 1;
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}
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rc = execl("/bin/sh", "sh", nullptr);
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perror("execl");
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return 1;
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}
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