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/* $OpenBSD: sshlogin.c,v 1.34 2019/06/28 13:35:04 deraadt Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
* This file performs some of the things login(1) normally does. We cannot
* easily use something like login -p -h host -f user, because there are
* several different logins around, and it is hard to determined what kind of
* login the current system has. Also, we want to be able to execute commands
* on a tty.
*
* As far as I am concerned, the code I have written for this software
* can be used freely for any purpose. Any derived versions of this
* software must be clearly marked as such, and if the derived work is
* incompatible with the protocol description in the RFC file, it must be
* called by a name other than "ssh" or "Secure Shell".
*
* Copyright (c) 1999 Theo de Raadt. All rights reserved.
* Copyright (c) 1999 Markus Friedl. 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 ``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 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 "includes.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <limits.h>
#include "sshlogin.h"
#include "ssherr.h"
#include "loginrec.h"
#include "log.h"
#include "sshbuf.h"
#include "misc.h"
#include "servconf.h"
extern struct sshbuf *loginmsg;
extern ServerOptions options;
/*
* Returns the time when the user last logged in. Returns 0 if the
* information is not available. This must be called before record_login.
* The host the user logged in from will be returned in buf.
*/
time_t
get_last_login_time(uid_t uid, const char *logname,
char *buf, size_t bufsize)
{
struct logininfo li;
login_get_lastlog(&li, uid);
strlcpy(buf, li.hostname, bufsize);
return (time_t)li.tv_sec;
}
/*
* Generate and store last login message. This must be done before
* login_login() is called and lastlog is updated.
*/
static void
store_lastlog_message(const char *user, uid_t uid)
{
#ifndef NO_SSH_LASTLOG
# ifndef CUSTOM_SYS_AUTH_GET_LASTLOGIN_MSG
char hostname[HOST_NAME_MAX+1] = "";
time_t last_login_time;
# endif
char *time_string;
int r;
if (!options.print_lastlog)
return;
# ifdef CUSTOM_SYS_AUTH_GET_LASTLOGIN_MSG
time_string = sys_auth_get_lastlogin_msg(user, uid);
if (time_string != NULL) {
if ((r = sshbuf_put(loginmsg,
time_string, strlen(time_string))) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
free(time_string);
}
# else
last_login_time = get_last_login_time(uid, user, hostname,
sizeof(hostname));
if (last_login_time != 0) {
time_string = ctime(&last_login_time);
time_string[strcspn(time_string, "\n")] = '\0';
if (strcmp(hostname, "") == 0)
r = sshbuf_putf(loginmsg, "Last login: %s\r\n",
time_string);
else
r = sshbuf_putf(loginmsg, "Last login: %s from %s\r\n",
time_string, hostname);
if (r != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
}
# endif /* CUSTOM_SYS_AUTH_GET_LASTLOGIN_MSG */
#endif /* NO_SSH_LASTLOG */
}
/*
* Records that the user has logged in. I wish these parts of operating
* systems were more standardized.
*/
void
record_login(pid_t pid, const char *tty, const char *user, uid_t uid,
const char *host, struct sockaddr *addr, socklen_t addrlen)
{
struct logininfo *li;
/* save previous login details before writing new */
store_lastlog_message(user, uid);
li = login_alloc_entry(pid, user, host, tty);
login_set_addr(li, addr, addrlen);
login_login(li);
login_free_entry(li);
}
#ifdef LOGIN_NEEDS_UTMPX
void
record_utmp_only(pid_t pid, const char *ttyname, const char *user,
const char *host, struct sockaddr *addr, socklen_t addrlen)
{
struct logininfo *li;
li = login_alloc_entry(pid, user, host, ttyname);
login_set_addr(li, addr, addrlen);
login_utmp_only(li);
login_free_entry(li);
}
#endif
/* Records that the user has logged out. */
void
record_logout(pid_t pid, const char *tty, const char *user)
{
struct logininfo *li;
li = login_alloc_entry(pid, user, NULL, tty);
login_logout(li);
login_free_entry(li);
}
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