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ulog-helper.c
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Editing: ulog-helper.c
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2009 Ed Schouten <ed@FreeBSD.org> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <pwd.h> #include <unistd.h> #include <stdlib.h> #include <string.h> #include <sysexits.h> #include <ulog.h> /* * This setuid helper utility writes user login records to disk. * Unprivileged processes are not capable of writing records to utmpx, * but we do want to allow this for pseudo-terminals. Because a file * descriptor to a pseudo-terminal master device can only be obtained by * processes using the pseudo-terminal, we expect such a descriptor on * stdin. * * It uses the real user ID of the calling process to determine the * username. It does allow users to log arbitrary hostnames. */ static const char * get_username(void) { const struct passwd *pw; const char *login; uid_t uid; /* * Attempt to determine the username corresponding to this login * session. First, validate the results of getlogin() against * the password database. If getlogin() returns invalid data, * return an arbitrary username corresponding to this uid. */ uid = getuid(); if ((login = getlogin()) != NULL && (pw = getpwnam(login)) != NULL && pw->pw_uid == uid) return (login); if ((pw = getpwuid(uid)) != NULL) return (pw->pw_name); return (NULL); } int main(int argc, char *argv[]) { const char *line, *user, *host; /* Device line name. */ if ((line = ptsname(STDIN_FILENO)) == NULL) return (EX_USAGE); if ((argc == 2 || argc == 3) && strcmp(argv[1], "login") == 0) { /* Username. */ user = get_username(); if (user == NULL) return (EX_OSERR); /* Hostname. */ host = argc == 3 ? argv[2] : NULL; ulog_login(line, user, host); return (EX_OK); } else if (argc == 2 && strcmp(argv[1], "logout") == 0) { ulog_logout(line); return (EX_OK); } return (EX_USAGE); }
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