150 lines
3.6 KiB
C
150 lines
3.6 KiB
C
/*
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*
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* login.c
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*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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*
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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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*
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* Created: Fri Mar 24 14:51:08 1995 ylo
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*
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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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*/
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#include "includes.h"
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RCSID("$Id: login.c,v 1.7 1999/12/20 22:51:36 damien Exp $");
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#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
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# include <utmpx.h>
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#endif
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#ifdef HAVE_UTMP_H
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# include <utmp.h>
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#endif
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#include "ssh.h"
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#ifdef HAVE_UTIL_H
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# include <util.h>
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#endif
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#ifdef HAVE_LASTLOG_H
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# include <lastlog.h>
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#endif
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#ifdef HAVE_LOGIN_H
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# include <login.h>
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#endif
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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(int pid, const char *ttyname, const char *user, uid_t uid,
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const char *host, struct sockaddr_in * 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_STR 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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#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
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u.ut_tv.tv_sec = time(NULL);
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strncpy(u.ut_user, user, sizeof(u.ut_name));
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#else
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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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#endif
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#if defined(HAVE_HOST_IN_UTMP) || defined(HAVE_HOST_IN_UTMPX)
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strncpy(u.ut_host, host, sizeof(u.ut_host));
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#endif
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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(int pid, const char *ttyname)
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{
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#ifdef HAVE_LIBUTIL_LOGIN
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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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#else /* HAVE_LIBUTIL_LOGIN */
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record_login(pid, ttyname, "", -1, "", NULL);
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#endif /* HAVE_LIBUTIL_LOGIN */
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}
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