151 lines
4.8 KiB
C
151 lines
4.8 KiB
C
/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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* This file performs some of the things login(1) normally does. We cannot
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* easily use something like login -p -h host -f user, because there are
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* several different logins around, and it is hard to determined what kind of
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* login the current system has. Also, we want to be able to execute commands
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* on a tty.
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*
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* Copyright (c) 1999 Theo de Raadt. All rights reserved.
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* Copyright (c) 1999 Markus Friedl. 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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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RCSID("$OpenBSD: login.c,v 1.15 2000/09/07 20:27:52 deraadt Exp $");
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RCSID("$FreeBSD$");
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#ifdef __FreeBSD__
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#include <libutil.h>
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#else
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#include <util.h>
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#endif /* __FreeBSD__ */
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#include <utmp.h>
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#include "ssh.h"
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/*
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* Returns the time when the user last logged in. Returns 0 if the
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* information is not available. This must be called before record_login.
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* The host the user logged in from will be returned in buf.
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*/
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/*
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* Returns the time when the user last logged in (or 0 if no previous login
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* is found). The name of the host used last time is returned in buf.
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*/
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unsigned long
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get_last_login_time(uid_t uid, const char *logname,
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char *buf, unsigned int bufsize)
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{
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struct lastlog ll;
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char *lastlog;
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int fd;
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lastlog = _PATH_LASTLOG;
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buf[0] = '\0';
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fd = open(lastlog, O_RDONLY);
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if (fd < 0)
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return 0;
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lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
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if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
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close(fd);
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return 0;
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}
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close(fd);
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if (bufsize > sizeof(ll.ll_host) + 1)
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bufsize = sizeof(ll.ll_host) + 1;
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strncpy(buf, ll.ll_host, bufsize - 1);
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buf[bufsize - 1] = 0;
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return ll.ll_time;
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}
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/*
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* Records that the user has logged in. I these parts of operating systems
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* were more standardized.
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*/
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void
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record_login(pid_t pid, const char *ttyname, const char *user, uid_t uid,
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const char *host, struct sockaddr * addr)
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{
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int fd;
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struct lastlog ll;
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char *lastlog;
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struct utmp u;
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const char *utmp, *wtmp;
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/* Construct an utmp/wtmp entry. */
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memset(&u, 0, sizeof(u));
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strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line));
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u.ut_time = time(NULL);
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strncpy(u.ut_name, user, sizeof(u.ut_name));
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realhostname_sa(u.ut_host, sizeof(u.ut_host), addr, addr->sa_len);
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/* Figure out the file names. */
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utmp = _PATH_UTMP;
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wtmp = _PATH_WTMP;
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login(&u);
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lastlog = _PATH_LASTLOG;
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/* Update lastlog unless actually recording a logout. */
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if (strcmp(user, "") != 0) {
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/*
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* It is safer to bzero the lastlog structure first because
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* some systems might have some extra fields in it (e.g. SGI)
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*/
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memset(&ll, 0, sizeof(ll));
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/* Update lastlog. */
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ll.ll_time = time(NULL);
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strncpy(ll.ll_line, ttyname + 5, sizeof(ll.ll_line));
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strncpy(ll.ll_host, host, sizeof(ll.ll_host));
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fd = open(lastlog, O_RDWR);
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if (fd >= 0) {
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lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
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if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
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log("Could not write %.100s: %.100s", lastlog, strerror(errno));
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close(fd);
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}
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}
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}
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/* Records that the user has logged out. */
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void
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record_logout(pid_t pid, const char *ttyname)
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{
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const char *line = ttyname + 5; /* /dev/ttyq8 -> ttyq8 */
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if (logout(line))
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logwtmp(line, "", "");
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}
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