82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
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/*-
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* Copyright (c) 2009 Ed Schouten <ed@FreeBSD.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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* 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
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 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
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <pwd.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <ulog.h>
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/*
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* This setuid helper utility writes user login records to disk.
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* Unprivileged processes are not capable of writing records to utmp,
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* wtmp and lastlog, but we do want to allow this for pseudo-terminals.
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* Because a file descriptor to a pseudo-terminal master device can only
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* be obtained by processes using the pseudo-terminal, we expect such a
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* descriptor on stdin.
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*
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* It uses the real user ID of the calling process to determine the
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* username. It does allow users to log arbitrary hostnames.
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*/
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int
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main(int argc, char *argv[])
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{
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const char *line;
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/* Device line name. */
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if ((line = ptsname(STDIN_FILENO)) == NULL)
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return (EX_USAGE);
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if ((argc == 2 || argc == 3) && strcmp(argv[1], "login") == 0) {
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struct passwd *pwd;
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const char *host = NULL;
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/* Username. */
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pwd = getpwuid(getuid());
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if (pwd == NULL)
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return (EX_OSERR);
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/* Hostname. */
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if (argc == 3)
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host = argv[2];
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if (ulog_login(line, pwd->pw_name, host) != 0)
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return (EX_OSFILE);
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return (EX_OK);
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} else if (argc == 2 && strcmp(argv[1], "logout") == 0) {
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if (ulog_logout(line) != 0)
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return (EX_OSFILE);
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return (EX_OK);
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}
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return (EX_USAGE);
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}
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