225 lines
7.1 KiB
C
225 lines
7.1 KiB
C
/* $NetBSD: sshlogin.c,v 1.14 2004/11/11 22:08:39 christos Exp $ */
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/*
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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: sshlogin.c,v 1.5 2002/08/29 15:57:25 stevesk Exp $");
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__RCSID("$NetBSD: sshlogin.c,v 1.14 2004/11/11 22:08:39 christos Exp $");
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#include <util.h>
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#ifdef SUPPORT_UTMP
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#include <utmp.h>
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#endif
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#ifdef SUPPORT_UTMPX
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#include <utmpx.h>
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#endif
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#include "sshlogin.h"
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#include "log.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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u_long
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get_last_login_time(uid_t uid, const char *logname,
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char *buf, u_int bufsize)
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{
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#ifdef SUPPORT_UTMPX
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struct lastlogx llx, *llxp;
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#endif
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#ifdef SUPPORT_UTMP
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struct lastlog ll;
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int fd;
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#endif
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buf[0] = '\0';
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#ifdef SUPPORT_UTMPX
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if ((llxp = getlastlogx(_PATH_LASTLOGX, uid, &llx)) != NULL) {
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if (bufsize > sizeof(llxp->ll_host) + 1)
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bufsize = sizeof(llxp->ll_host) + 1;
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strncpy(buf, llxp->ll_host, bufsize - 1);
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buf[bufsize - 1] = 0;
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return llxp->ll_tv.tv_sec;
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}
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#endif
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#ifdef SUPPORT_UTMP
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fd = open(_PATH_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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#else
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return 0;
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#endif
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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, socklen_t addrlen)
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{
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#if defined(SUPPORT_UTMP) || defined(SUPPORT_UTMPX)
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int fd;
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#endif
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struct timeval tv;
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#ifdef SUPPORT_UTMP
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struct utmp u;
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struct lastlog ll;
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#endif
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#ifdef SUPPORT_UTMPX
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struct utmpx ux, *uxp = &ux;
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struct lastlogx llx;
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#endif
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(void)gettimeofday(&tv, NULL);
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/*
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* XXX: why do we need to handle logout cases here?
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* Isn't the function below taking care of this?
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*/
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#ifdef SUPPORT_UTMP
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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_t)tv.tv_sec;
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strncpy(u.ut_name, user, sizeof(u.ut_name));
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strncpy(u.ut_host, host, sizeof(u.ut_host));
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login(&u);
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/* Update lastlog unless actually recording a logout. */
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if (*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(_PATH_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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logit("Could not write %.100s: %.100s",
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_PATH_LASTLOG, strerror(errno));
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close(fd);
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}
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}
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#endif
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#ifdef SUPPORT_UTMPX
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/* Construct an utmpx/wtmpx entry. */
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memset(&ux, 0, sizeof(ux));
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strncpy(ux.ut_line, ttyname + 5, sizeof(ux.ut_line));
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if (*user) {
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ux.ut_pid = pid;
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ux.ut_type = USER_PROCESS;
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ux.ut_tv = tv;
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strncpy(ux.ut_name, user, sizeof(ux.ut_name));
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strncpy(ux.ut_host, host, sizeof(ux.ut_host));
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/* XXX: need ut_id, use last 4 char of ttyname */
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if (strlen(ttyname) > sizeof(ux.ut_id)) {
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strncpy(ux.ut_id,
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ttyname + strlen(ttyname) - sizeof(ux.ut_id),
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sizeof(ux.ut_id));
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} else
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strncpy(ux.ut_id, ttyname, sizeof(ux.ut_id));
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/* XXX: It would be better if we had sockaddr_storage here */
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if (addrlen > sizeof(ux.ut_ss))
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addrlen = sizeof(ux.ut_ss);
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(void)memcpy(&ux.ut_ss, addr, addrlen);
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if (pututxline(&ux) == NULL)
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logit("could not add utmpx line: %.100s",
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strerror(errno));
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/* Update lastlog. */
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(void)gettimeofday(&llx.ll_tv, NULL);
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strncpy(llx.ll_line, ttyname + 5, sizeof(llx.ll_line));
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strncpy(llx.ll_host, host, sizeof(llx.ll_host));
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(void)memcpy(&llx.ll_ss, addr, addrlen);
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if (updlastlogx(_PATH_LASTLOGX, uid, &llx) == -1)
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logit("Could not update %.100s: %.100s",
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_PATH_LASTLOGX, strerror(errno));
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} else {
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if ((uxp = getutxline(&ux)) == NULL)
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logit("could not find utmpx line for %.100s",
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ttyname);
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uxp->ut_type = DEAD_PROCESS;
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uxp->ut_tv = tv;
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/* XXX: we don't record exit info yet */
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if (pututxline(&ux) == NULL)
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logit("could not replace utmpx line: %.100s",
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strerror(errno));
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}
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endutxent();
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updwtmpx(_PATH_WTMPX, uxp);
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#endif
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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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#if defined(SUPPORT_UTMP) || defined(SUPPORT_UTMPX)
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const char *line = ttyname + 5; /* /dev/ttyq8 -> ttyq8 */
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#endif
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#ifdef SUPPORT_UTMP
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if (logout(line))
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logwtmp(line, "", "");
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#endif
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#ifdef SUPPORT_UTMPX
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/* XXX: no exit info yet */
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if (logoutx(line, 0, DEAD_PROCESS))
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logwtmpx(line, "", "", 0, DEAD_PROCESS);
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#endif
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}
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