2002-06-27 22:31:32 +00:00
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/*
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* Copyright (c) 2000 Andre Lucas. All rights reserved.
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* Portions copyright (c) 1998 Todd C. Miller
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* Portions copyright (c) 1996 Jason Downs
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* Portions copyright (c) 1996 Theo de Raadt
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Markus Friedl.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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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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/**
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** loginrec.c: platform-independent login recording and lastlog retrieval
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**/
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/*
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The new login code explained
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============================
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This code attempts to provide a common interface to login recording
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(utmp and friends) and last login time retrieval.
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Its primary means of achieving this is to use 'struct logininfo', a
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union of all the useful fields in the various different types of
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system login record structures one finds on UNIX variants.
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We depend on autoconf to define which recording methods are to be
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used, and which fields are contained in the relevant data structures
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on the local system. Many C preprocessor symbols affect which code
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gets compiled here.
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The code is designed to make it easy to modify a particular
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recording method, without affecting other methods nor requiring so
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many nested conditional compilation blocks as were commonplace in
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the old code.
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For login recording, we try to use the local system's libraries as
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these are clearly most likely to work correctly. For utmp systems
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this usually means login() and logout() or setutent() etc., probably
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in libutil, along with logwtmp() etc. On these systems, we fall back
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to writing the files directly if we have to, though this method
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requires very thorough testing so we do not corrupt local auditing
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information. These files and their access methods are very system
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specific indeed.
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For utmpx systems, the corresponding library functions are
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setutxent() etc. To the author's knowledge, all utmpx systems have
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these library functions and so no direct write is attempted. If such
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a system exists and needs support, direct analogues of the [uw]tmp
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code should suffice.
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Retrieving the time of last login ('lastlog') is in some ways even
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more problemmatic than login recording. Some systems provide a
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simple table of all users which we seek based on uid and retrieve a
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relatively standard structure. Others record the same information in
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a directory with a separate file, and others don't record the
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information separately at all. For systems in the latter category,
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we look backwards in the wtmp or wtmpx file for the last login entry
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for our user. Naturally this is slower and on busy systems could
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incur a significant performance penalty.
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Calling the new code
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--------------------
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In OpenSSH all login recording and retrieval is performed in
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login.c. Here you'll find working examples. Also, in the logintest.c
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program there are more examples.
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Internal handler calling method
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-------------------------------
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When a call is made to login_login() or login_logout(), both
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routines set a struct logininfo flag defining which action (log in,
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or log out) is to be taken. They both then call login_write(), which
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calls whichever of the many structure-specific handlers autoconf
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selects for the local system.
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The handlers themselves handle system data structure specifics. Both
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struct utmp and struct utmpx have utility functions (see
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construct_utmp*()) to try to make it simpler to add extra systems
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that introduce new features to either structure.
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While it may seem terribly wasteful to replicate so much similar
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code for each method, experience has shown that maintaining code to
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write both struct utmp and utmpx in one function, whilst maintaining
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support for all systems whether they have library support or not, is
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a difficult and time-consuming task.
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Lastlog support proceeds similarly. Functions login_get_lastlog()
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(and its OpenSSH-tuned friend login_get_lastlog_time()) call
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getlast_entry(), which tries one of three methods to find the last
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login time. It uses local system lastlog support if it can,
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otherwise it tries wtmp or wtmpx before giving up and returning 0,
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meaning "tilt".
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Maintenance
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-----------
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In many cases it's possible to tweak autoconf to select the correct
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methods for a particular platform, either by improving the detection
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code (best), or by presetting DISABLE_<method> or CONF_<method>_FILE
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symbols for the platform.
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Use logintest to check which symbols are defined before modifying
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configure.ac and loginrec.c. (You have to build logintest yourself
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with 'make logintest' as it's not built by default.)
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Otherwise, patches to the specific method(s) are very helpful!
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*/
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/**
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** TODO:
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** homegrown ttyslot()
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** test, test, test
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**
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** Platform status:
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** ----------------
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**
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** Known good:
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** Linux (Redhat 6.2, Debian)
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** Solaris
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** HP-UX 10.20 (gcc only)
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** IRIX
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** NeXT - M68k/HPPA/Sparc (4.2/3.3)
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**
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** Testing required: Please send reports!
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** NetBSD
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** HP-UX 11
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** AIX
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**
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** Platforms with known problems:
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** Some variants of Slackware Linux
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**
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**/
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#include "includes.h"
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#include "ssh.h"
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#include "xmalloc.h"
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#include "loginrec.h"
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#include "log.h"
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#include "atomicio.h"
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2002-10-29 09:43:00 +00:00
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RCSID("$Id: loginrec.c,v 1.44 2002/09/26 00:38:49 tim Exp $");
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2002-06-27 22:31:32 +00:00
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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_LIBUTIL_H
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# include <libutil.h>
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#endif
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/**
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** prototypes for helper functions in this file
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**/
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#if HAVE_UTMP_H
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void set_utmp_time(struct logininfo *li, struct utmp *ut);
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void construct_utmp(struct logininfo *li, struct utmp *ut);
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#endif
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#ifdef HAVE_UTMPX_H
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void set_utmpx_time(struct logininfo *li, struct utmpx *ut);
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void construct_utmpx(struct logininfo *li, struct utmpx *ut);
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#endif
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int utmp_write_entry(struct logininfo *li);
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int utmpx_write_entry(struct logininfo *li);
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int wtmp_write_entry(struct logininfo *li);
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int wtmpx_write_entry(struct logininfo *li);
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int lastlog_write_entry(struct logininfo *li);
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int syslogin_write_entry(struct logininfo *li);
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int getlast_entry(struct logininfo *li);
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int lastlog_get_entry(struct logininfo *li);
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int wtmp_get_entry(struct logininfo *li);
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int wtmpx_get_entry(struct logininfo *li);
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/* pick the shortest string */
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#define MIN_SIZEOF(s1,s2) ( sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2) )
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/**
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** platform-independent login functions
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**/
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/* login_login(struct logininfo *) -Record a login
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*
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* Call with a pointer to a struct logininfo initialised with
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* login_init_entry() or login_alloc_entry()
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*
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* Returns:
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* >0 if successful
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* 0 on failure (will use OpenSSH's logging facilities for diagnostics)
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*/
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int
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login_login (struct logininfo *li)
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{
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li->type = LTYPE_LOGIN;
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return login_write(li);
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}
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/* login_logout(struct logininfo *) - Record a logout
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*
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* Call as with login_login()
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*
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* Returns:
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* >0 if successful
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* 0 on failure (will use OpenSSH's logging facilities for diagnostics)
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*/
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int
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login_logout(struct logininfo *li)
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{
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li->type = LTYPE_LOGOUT;
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return login_write(li);
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}
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/* login_get_lastlog_time(int) - Retrieve the last login time
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*
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* Retrieve the last login time for the given uid. Will try to use the
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* system lastlog facilities if they are available, but will fall back
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* to looking in wtmp/wtmpx if necessary
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*
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* Returns:
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* 0 on failure, or if user has never logged in
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* Time in seconds from the epoch if successful
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*
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* Useful preprocessor symbols:
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* DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog
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* info
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* USE_LASTLOG: If set, indicates the presence of system lastlog
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* facilities. If this and DISABLE_LASTLOG are not set,
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* try to retrieve lastlog information from wtmp/wtmpx.
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*/
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unsigned int
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login_get_lastlog_time(const int uid)
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{
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struct logininfo li;
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if (login_get_lastlog(&li, uid))
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return li.tv_sec;
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else
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return 0;
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}
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/* login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry
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*
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* Retrieve a logininfo structure populated (only partially) with
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* information from the system lastlog data, or from wtmp/wtmpx if no
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* system lastlog information exists.
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*
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* Note this routine must be given a pre-allocated logininfo.
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*
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* Returns:
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* >0: A pointer to your struct logininfo if successful
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* 0 on failure (will use OpenSSH's logging facilities for diagnostics)
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*
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*/
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struct logininfo *
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login_get_lastlog(struct logininfo *li, const int uid)
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{
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struct passwd *pw;
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memset(li, '\0', sizeof(*li));
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li->uid = uid;
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/*
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* If we don't have a 'real' lastlog, we need the username to
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* reliably search wtmp(x) for the last login (see
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* wtmp_get_entry().)
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*/
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pw = getpwuid(uid);
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if (pw == NULL)
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fatal("login_get_lastlog: Cannot find account for uid %i", uid);
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/* No MIN_SIZEOF here - we absolutely *must not* truncate the
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* username */
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strlcpy(li->username, pw->pw_name, sizeof(li->username));
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if (getlast_entry(li))
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return li;
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else
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return NULL;
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}
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/* login_alloc_entry(int, char*, char*, char*) - Allocate and initialise
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* a logininfo structure
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*
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* This function creates a new struct logininfo, a data structure
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* meant to carry the information required to portably record login info.
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*
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* Returns a pointer to a newly created struct logininfo. If memory
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* allocation fails, the program halts.
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*/
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struct
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logininfo *login_alloc_entry(int pid, const char *username,
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const char *hostname, const char *line)
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{
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struct logininfo *newli;
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newli = (struct logininfo *) xmalloc (sizeof(*newli));
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(void)login_init_entry(newli, pid, username, hostname, line);
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return newli;
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}
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/* login_free_entry(struct logininfo *) - free struct memory */
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void
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login_free_entry(struct logininfo *li)
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{
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xfree(li);
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}
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/* login_init_entry(struct logininfo *, int, char*, char*, char*)
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* - initialise a struct logininfo
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*
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* Populates a new struct logininfo, a data structure meant to carry
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* the information required to portably record login info.
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*
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* Returns: 1
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*/
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int
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login_init_entry(struct logininfo *li, int pid, const char *username,
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const char *hostname, const char *line)
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{
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struct passwd *pw;
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memset(li, 0, sizeof(*li));
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li->pid = pid;
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/* set the line information */
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if (line)
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line_fullname(li->line, line, sizeof(li->line));
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if (username) {
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strlcpy(li->username, username, sizeof(li->username));
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pw = getpwnam(li->username);
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if (pw == NULL)
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fatal("login_init_entry: Cannot find user \"%s\"", li->username);
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li->uid = pw->pw_uid;
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}
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if (hostname)
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strlcpy(li->hostname, hostname, sizeof(li->hostname));
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return 1;
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}
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/* login_set_current_time(struct logininfo *) - set the current time
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*
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* Set the current time in a logininfo structure. This function is
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* meant to eliminate the need to deal with system dependencies for
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* time handling.
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*/
|
|
|
|
void
|
|
|
|
login_set_current_time(struct logininfo *li)
|
|
|
|
{
|
|
|
|
struct timeval tv;
|
|
|
|
|
|
|
|
gettimeofday(&tv, NULL);
|
|
|
|
|
|
|
|
li->tv_sec = tv.tv_sec;
|
|
|
|
li->tv_usec = tv.tv_usec;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* copy a sockaddr_* into our logininfo */
|
|
|
|
void
|
|
|
|
login_set_addr(struct logininfo *li, const struct sockaddr *sa,
|
|
|
|
const unsigned int sa_size)
|
|
|
|
{
|
|
|
|
unsigned int bufsize = sa_size;
|
|
|
|
|
|
|
|
/* make sure we don't overrun our union */
|
|
|
|
if (sizeof(li->hostaddr) < sa_size)
|
|
|
|
bufsize = sizeof(li->hostaddr);
|
|
|
|
|
|
|
|
memcpy((void *)&(li->hostaddr.sa), (const void *)sa, bufsize);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
** login_write: Call low-level recording functions based on autoconf
|
|
|
|
** results
|
|
|
|
**/
|
|
|
|
int
|
|
|
|
login_write (struct logininfo *li)
|
|
|
|
{
|
|
|
|
#ifndef HAVE_CYGWIN
|
|
|
|
if ((int)geteuid() != 0) {
|
|
|
|
log("Attempt to write login records by non-root user (aborting)");
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* set the timestamp */
|
|
|
|
login_set_current_time(li);
|
|
|
|
#ifdef USE_LOGIN
|
|
|
|
syslogin_write_entry(li);
|
|
|
|
#endif
|
|
|
|
#ifdef USE_LASTLOG
|
|
|
|
if (li->type == LTYPE_LOGIN) {
|
|
|
|
lastlog_write_entry(li);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef USE_UTMP
|
|
|
|
utmp_write_entry(li);
|
|
|
|
#endif
|
|
|
|
#ifdef USE_WTMP
|
|
|
|
wtmp_write_entry(li);
|
|
|
|
#endif
|
|
|
|
#ifdef USE_UTMPX
|
|
|
|
utmpx_write_entry(li);
|
|
|
|
#endif
|
|
|
|
#ifdef USE_WTMPX
|
|
|
|
wtmpx_write_entry(li);
|
|
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef LOGIN_NEEDS_UTMPX
|
|
|
|
int
|
|
|
|
login_utmp_only(struct logininfo *li)
|
|
|
|
{
|
|
|
|
li->type = LTYPE_LOGIN;
|
|
|
|
login_set_current_time(li);
|
|
|
|
# ifdef USE_UTMP
|
|
|
|
utmp_write_entry(li);
|
|
|
|
# endif
|
|
|
|
# ifdef USE_WTMP
|
|
|
|
wtmp_write_entry(li);
|
|
|
|
# endif
|
|
|
|
# ifdef USE_UTMPX
|
|
|
|
utmpx_write_entry(li);
|
|
|
|
# endif
|
|
|
|
# ifdef USE_WTMPX
|
|
|
|
wtmpx_write_entry(li);
|
|
|
|
# endif
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/**
|
|
|
|
** getlast_entry: Call low-level functions to retrieve the last login
|
|
|
|
** time.
|
|
|
|
**/
|
|
|
|
|
|
|
|
/* take the uid in li and return the last login time */
|
|
|
|
int
|
|
|
|
getlast_entry(struct logininfo *li)
|
|
|
|
{
|
|
|
|
#ifdef USE_LASTLOG
|
|
|
|
return(lastlog_get_entry(li));
|
|
|
|
#else /* !USE_LASTLOG */
|
|
|
|
|
|
|
|
#ifdef DISABLE_LASTLOG
|
|
|
|
/* On some systems we shouldn't even try to obtain last login
|
|
|
|
* time, e.g. AIX */
|
|
|
|
return 0;
|
|
|
|
# else /* DISABLE_LASTLOG */
|
|
|
|
/* Try to retrieve the last login time from wtmp */
|
|
|
|
# if defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP))
|
|
|
|
/* retrieve last login time from utmp */
|
|
|
|
return (wtmp_get_entry(li));
|
|
|
|
# else /* defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) */
|
|
|
|
/* If wtmp isn't available, try wtmpx */
|
|
|
|
# if defined(USE_WTMPX) && (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX))
|
|
|
|
/* retrieve last login time from utmpx */
|
|
|
|
return (wtmpx_get_entry(li));
|
|
|
|
# else
|
|
|
|
/* Give up: No means of retrieving last login time */
|
|
|
|
return 0;
|
|
|
|
# endif /* USE_WTMPX && (HAVE_TIME_IN_UTMPX || HAVE_TV_IN_UTMPX) */
|
|
|
|
# endif /* USE_WTMP && (HAVE_TIME_IN_UTMP || HAVE_TV_IN_UTMP) */
|
|
|
|
# endif /* DISABLE_LASTLOG */
|
|
|
|
#endif /* USE_LASTLOG */
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 'line' string utility functions
|
|
|
|
*
|
|
|
|
* These functions process the 'line' string into one of three forms:
|
|
|
|
*
|
|
|
|
* 1. The full filename (including '/dev')
|
|
|
|
* 2. The stripped name (excluding '/dev')
|
|
|
|
* 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00
|
|
|
|
* /dev/pts/1 -> ts/1 )
|
|
|
|
*
|
|
|
|
* Form 3 is used on some systems to identify a .tmp.? entry when
|
|
|
|
* attempting to remove it. Typically both addition and removal is
|
|
|
|
* performed by one application - say, sshd - so as long as the choice
|
|
|
|
* uniquely identifies a terminal it's ok.
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
|
|
/* line_fullname(): add the leading '/dev/' if it doesn't exist make
|
|
|
|
* sure dst has enough space, if not just copy src (ugh) */
|
|
|
|
char *
|
|
|
|
line_fullname(char *dst, const char *src, int dstsize)
|
|
|
|
{
|
|
|
|
memset(dst, '\0', dstsize);
|
|
|
|
if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) {
|
|
|
|
strlcpy(dst, src, dstsize);
|
|
|
|
} else {
|
|
|
|
strlcpy(dst, "/dev/", dstsize);
|
|
|
|
strlcat(dst, src, dstsize);
|
|
|
|
}
|
|
|
|
return dst;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* line_stripname(): strip the leading '/dev' if it exists, return dst */
|
|
|
|
char *
|
|
|
|
line_stripname(char *dst, const char *src, int dstsize)
|
|
|
|
{
|
|
|
|
memset(dst, '\0', dstsize);
|
|
|
|
if (strncmp(src, "/dev/", 5) == 0)
|
|
|
|
strlcpy(dst, src + 5, dstsize);
|
|
|
|
else
|
|
|
|
strlcpy(dst, src, dstsize);
|
|
|
|
return dst;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* line_abbrevname(): Return the abbreviated (usually four-character)
|
|
|
|
* form of the line (Just use the last <dstsize> characters of the
|
|
|
|
* full name.)
|
|
|
|
*
|
|
|
|
* NOTE: use strncpy because we do NOT necessarily want zero
|
|
|
|
* termination */
|
|
|
|
char *
|
|
|
|
line_abbrevname(char *dst, const char *src, int dstsize)
|
|
|
|
{
|
|
|
|
size_t len;
|
|
|
|
|
|
|
|
memset(dst, '\0', dstsize);
|
|
|
|
|
|
|
|
/* Always skip prefix if present */
|
|
|
|
if (strncmp(src, "/dev/", 5) == 0)
|
|
|
|
src += 5;
|
|
|
|
|
|
|
|
#ifdef WITH_ABBREV_NO_TTY
|
|
|
|
if (strncmp(src, "tty", 3) == 0)
|
|
|
|
src += 3;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
len = strlen(src);
|
|
|
|
|
|
|
|
if (len > 0) {
|
|
|
|
if (((int)len - dstsize) > 0)
|
|
|
|
src += ((int)len - dstsize);
|
|
|
|
|
|
|
|
/* note: _don't_ change this to strlcpy */
|
|
|
|
strncpy(dst, src, (size_t)dstsize);
|
|
|
|
}
|
|
|
|
|
|
|
|
return dst;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
** utmp utility functions
|
|
|
|
**
|
|
|
|
** These functions manipulate struct utmp, taking system differences
|
|
|
|
** into account.
|
|
|
|
**/
|
|
|
|
|
|
|
|
#if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN)
|
|
|
|
|
|
|
|
/* build the utmp structure */
|
|
|
|
void
|
|
|
|
set_utmp_time(struct logininfo *li, struct utmp *ut)
|
|
|
|
{
|
|
|
|
# ifdef HAVE_TV_IN_UTMP
|
|
|
|
ut->ut_tv.tv_sec = li->tv_sec;
|
|
|
|
ut->ut_tv.tv_usec = li->tv_usec;
|
|
|
|
# else
|
|
|
|
# ifdef HAVE_TIME_IN_UTMP
|
|
|
|
ut->ut_time = li->tv_sec;
|
|
|
|
# endif
|
|
|
|
# endif
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
construct_utmp(struct logininfo *li,
|
|
|
|
struct utmp *ut)
|
|
|
|
{
|
|
|
|
memset(ut, '\0', sizeof(*ut));
|
|
|
|
|
|
|
|
/* First fill out fields used for both logins and logouts */
|
|
|
|
|
|
|
|
# ifdef HAVE_ID_IN_UTMP
|
|
|
|
line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id));
|
|
|
|
# endif
|
|
|
|
|
|
|
|
# ifdef HAVE_TYPE_IN_UTMP
|
|
|
|
/* This is done here to keep utmp constants out of struct logininfo */
|
|
|
|
switch (li->type) {
|
|
|
|
case LTYPE_LOGIN:
|
|
|
|
ut->ut_type = USER_PROCESS;
|
2002-10-29 09:43:00 +00:00
|
|
|
#ifdef _UNICOS
|
2002-06-27 22:31:32 +00:00
|
|
|
cray_set_tmpdir(ut);
|
|
|
|
#endif
|
|
|
|
break;
|
|
|
|
case LTYPE_LOGOUT:
|
|
|
|
ut->ut_type = DEAD_PROCESS;
|
2002-10-29 09:43:00 +00:00
|
|
|
#ifdef _UNICOS
|
2002-06-27 22:31:32 +00:00
|
|
|
cray_retain_utmp(ut, li->pid);
|
|
|
|
#endif
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
# endif
|
|
|
|
set_utmp_time(li, ut);
|
|
|
|
|
|
|
|
line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line));
|
|
|
|
|
|
|
|
# ifdef HAVE_PID_IN_UTMP
|
|
|
|
ut->ut_pid = li->pid;
|
|
|
|
# endif
|
|
|
|
|
|
|
|
/* If we're logging out, leave all other fields blank */
|
|
|
|
if (li->type == LTYPE_LOGOUT)
|
|
|
|
return;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* These fields are only used when logging in, and are blank
|
|
|
|
* for logouts.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* Use strncpy because we don't necessarily want null termination */
|
|
|
|
strncpy(ut->ut_name, li->username, MIN_SIZEOF(ut->ut_name, li->username));
|
|
|
|
# ifdef HAVE_HOST_IN_UTMP
|
|
|
|
strncpy(ut->ut_host, li->hostname, MIN_SIZEOF(ut->ut_host, li->hostname));
|
|
|
|
# endif
|
|
|
|
# ifdef HAVE_ADDR_IN_UTMP
|
|
|
|
/* this is just a 32-bit IP address */
|
|
|
|
if (li->hostaddr.sa.sa_family == AF_INET)
|
|
|
|
ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
|
|
|
|
# endif
|
|
|
|
}
|
|
|
|
#endif /* USE_UTMP || USE_WTMP || USE_LOGIN */
|
|
|
|
|
|
|
|
/**
|
|
|
|
** utmpx utility functions
|
|
|
|
**
|
|
|
|
** These functions manipulate struct utmpx, accounting for system
|
|
|
|
** variations.
|
|
|
|
**/
|
|
|
|
|
|
|
|
#if defined(USE_UTMPX) || defined (USE_WTMPX)
|
|
|
|
/* build the utmpx structure */
|
|
|
|
void
|
|
|
|
set_utmpx_time(struct logininfo *li, struct utmpx *utx)
|
|
|
|
{
|
|
|
|
# ifdef HAVE_TV_IN_UTMPX
|
|
|
|
utx->ut_tv.tv_sec = li->tv_sec;
|
|
|
|
utx->ut_tv.tv_usec = li->tv_usec;
|
|
|
|
# else /* HAVE_TV_IN_UTMPX */
|
|
|
|
# ifdef HAVE_TIME_IN_UTMPX
|
|
|
|
utx->ut_time = li->tv_sec;
|
|
|
|
# endif /* HAVE_TIME_IN_UTMPX */
|
|
|
|
# endif /* HAVE_TV_IN_UTMPX */
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
construct_utmpx(struct logininfo *li, struct utmpx *utx)
|
|
|
|
{
|
|
|
|
memset(utx, '\0', sizeof(*utx));
|
|
|
|
# ifdef HAVE_ID_IN_UTMPX
|
|
|
|
line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id));
|
|
|
|
# endif
|
|
|
|
|
|
|
|
/* this is done here to keep utmp constants out of loginrec.h */
|
|
|
|
switch (li->type) {
|
|
|
|
case LTYPE_LOGIN:
|
|
|
|
utx->ut_type = USER_PROCESS;
|
|
|
|
break;
|
|
|
|
case LTYPE_LOGOUT:
|
|
|
|
utx->ut_type = DEAD_PROCESS;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line));
|
|
|
|
set_utmpx_time(li, utx);
|
|
|
|
utx->ut_pid = li->pid;
|
|
|
|
/* strncpy(): Don't necessarily want null termination */
|
|
|
|
strncpy(utx->ut_name, li->username, MIN_SIZEOF(utx->ut_name, li->username));
|
|
|
|
|
|
|
|
if (li->type == LTYPE_LOGOUT)
|
|
|
|
return;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* These fields are only used when logging in, and are blank
|
|
|
|
* for logouts.
|
|
|
|
*/
|
|
|
|
|
|
|
|
# ifdef HAVE_HOST_IN_UTMPX
|
|
|
|
strncpy(utx->ut_host, li->hostname, MIN_SIZEOF(utx->ut_host, li->hostname));
|
|
|
|
# endif
|
|
|
|
# ifdef HAVE_ADDR_IN_UTMPX
|
|
|
|
/* this is just a 32-bit IP address */
|
|
|
|
if (li->hostaddr.sa.sa_family == AF_INET)
|
|
|
|
utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
|
|
|
|
# endif
|
|
|
|
# ifdef HAVE_SYSLEN_IN_UTMPX
|
|
|
|
/* ut_syslen is the length of the utx_host string */
|
|
|
|
utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host));
|
|
|
|
# endif
|
|
|
|
}
|
|
|
|
#endif /* USE_UTMPX || USE_WTMPX */
|
|
|
|
|
|
|
|
/**
|
|
|
|
** Low-level utmp functions
|
|
|
|
**/
|
|
|
|
|
|
|
|
/* FIXME: (ATL) utmp_write_direct needs testing */
|
|
|
|
#ifdef USE_UTMP
|
|
|
|
|
|
|
|
/* if we can, use pututline() etc. */
|
|
|
|
# if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \
|
|
|
|
defined(HAVE_PUTUTLINE)
|
|
|
|
# define UTMP_USE_LIBRARY
|
|
|
|
# endif
|
|
|
|
|
|
|
|
|
|
|
|
/* write a utmp entry with the system's help (pututline() and pals) */
|
|
|
|
# ifdef UTMP_USE_LIBRARY
|
|
|
|
static int
|
|
|
|
utmp_write_library(struct logininfo *li, struct utmp *ut)
|
|
|
|
{
|
|
|
|
setutent();
|
|
|
|
pututline(ut);
|
|
|
|
|
|
|
|
# ifdef HAVE_ENDUTENT
|
|
|
|
endutent();
|
|
|
|
# endif
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
# else /* UTMP_USE_LIBRARY */
|
|
|
|
|
|
|
|
/* write a utmp entry direct to the file */
|
|
|
|
/* This is a slightly modification of code in OpenBSD's login.c */
|
|
|
|
static int
|
|
|
|
utmp_write_direct(struct logininfo *li, struct utmp *ut)
|
|
|
|
{
|
|
|
|
struct utmp old_ut;
|
|
|
|
register int fd;
|
|
|
|
int tty;
|
|
|
|
|
|
|
|
/* FIXME: (ATL) ttyslot() needs local implementation */
|
|
|
|
|
|
|
|
#if defined(HAVE_GETTTYENT)
|
|
|
|
register struct ttyent *ty;
|
|
|
|
|
|
|
|
tty=0;
|
|
|
|
|
|
|
|
setttyent();
|
|
|
|
while ((struct ttyent *)0 != (ty = getttyent())) {
|
|
|
|
tty++;
|
|
|
|
if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line)))
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
endttyent();
|
|
|
|
|
|
|
|
if((struct ttyent *)0 == ty) {
|
|
|
|
log("utmp_write_entry: tty not found");
|
|
|
|
return(1);
|
|
|
|
}
|
|
|
|
#else /* FIXME */
|
|
|
|
|
|
|
|
tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */
|
|
|
|
|
|
|
|
#endif /* HAVE_GETTTYENT */
|
|
|
|
|
|
|
|
if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) {
|
|
|
|
(void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
|
|
|
|
/*
|
|
|
|
* Prevent luser from zero'ing out ut_host.
|
|
|
|
* If the new ut_line is empty but the old one is not
|
|
|
|
* and ut_line and ut_name match, preserve the old ut_line.
|
|
|
|
*/
|
|
|
|
if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) &&
|
|
|
|
(ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') &&
|
|
|
|
(strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) &&
|
|
|
|
(strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) {
|
|
|
|
(void)memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host));
|
|
|
|
}
|
|
|
|
|
|
|
|
(void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
|
|
|
|
if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut))
|
|
|
|
log("utmp_write_direct: error writing %s: %s",
|
|
|
|
UTMP_FILE, strerror(errno));
|
|
|
|
|
|
|
|
(void)close(fd);
|
|
|
|
return 1;
|
|
|
|
} else {
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
# endif /* UTMP_USE_LIBRARY */
|
|
|
|
|
|
|
|
static int
|
|
|
|
utmp_perform_login(struct logininfo *li)
|
|
|
|
{
|
|
|
|
struct utmp ut;
|
|
|
|
|
|
|
|
construct_utmp(li, &ut);
|
|
|
|
# ifdef UTMP_USE_LIBRARY
|
|
|
|
if (!utmp_write_library(li, &ut)) {
|
|
|
|
log("utmp_perform_login: utmp_write_library() failed");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
# else
|
|
|
|
if (!utmp_write_direct(li, &ut)) {
|
|
|
|
log("utmp_perform_login: utmp_write_direct() failed");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
# endif
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
utmp_perform_logout(struct logininfo *li)
|
|
|
|
{
|
|
|
|
struct utmp ut;
|
|
|
|
|
|
|
|
construct_utmp(li, &ut);
|
|
|
|
# ifdef UTMP_USE_LIBRARY
|
|
|
|
if (!utmp_write_library(li, &ut)) {
|
|
|
|
log("utmp_perform_logout: utmp_write_library() failed");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
# else
|
|
|
|
if (!utmp_write_direct(li, &ut)) {
|
|
|
|
log("utmp_perform_logout: utmp_write_direct() failed");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
# endif
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
utmp_write_entry(struct logininfo *li)
|
|
|
|
{
|
|
|
|
switch(li->type) {
|
|
|
|
case LTYPE_LOGIN:
|
|
|
|
return utmp_perform_login(li);
|
|
|
|
|
|
|
|
case LTYPE_LOGOUT:
|
|
|
|
return utmp_perform_logout(li);
|
|
|
|
|
|
|
|
default:
|
|
|
|
log("utmp_write_entry: invalid type field");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif /* USE_UTMP */
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
** Low-level utmpx functions
|
|
|
|
**/
|
|
|
|
|
|
|
|
/* not much point if we don't want utmpx entries */
|
|
|
|
#ifdef USE_UTMPX
|
|
|
|
|
|
|
|
/* if we have the wherewithall, use pututxline etc. */
|
|
|
|
# if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \
|
|
|
|
defined(HAVE_PUTUTXLINE)
|
|
|
|
# define UTMPX_USE_LIBRARY
|
|
|
|
# endif
|
|
|
|
|
|
|
|
|
|
|
|
/* write a utmpx entry with the system's help (pututxline() and pals) */
|
|
|
|
# ifdef UTMPX_USE_LIBRARY
|
|
|
|
static int
|
|
|
|
utmpx_write_library(struct logininfo *li, struct utmpx *utx)
|
|
|
|
{
|
|
|
|
setutxent();
|
|
|
|
pututxline(utx);
|
|
|
|
|
|
|
|
# ifdef HAVE_ENDUTXENT
|
|
|
|
endutxent();
|
|
|
|
# endif
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
# else /* UTMPX_USE_LIBRARY */
|
|
|
|
|
|
|
|
/* write a utmp entry direct to the file */
|
|
|
|
static int
|
|
|
|
utmpx_write_direct(struct logininfo *li, struct utmpx *utx)
|
|
|
|
{
|
|
|
|
log("utmpx_write_direct: not implemented!");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
# endif /* UTMPX_USE_LIBRARY */
|
|
|
|
|
|
|
|
static int
|
|
|
|
utmpx_perform_login(struct logininfo *li)
|
|
|
|
{
|
|
|
|
struct utmpx utx;
|
|
|
|
|
|
|
|
construct_utmpx(li, &utx);
|
|
|
|
# ifdef UTMPX_USE_LIBRARY
|
|
|
|
if (!utmpx_write_library(li, &utx)) {
|
|
|
|
log("utmpx_perform_login: utmp_write_library() failed");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
# else
|
|
|
|
if (!utmpx_write_direct(li, &ut)) {
|
|
|
|
log("utmpx_perform_login: utmp_write_direct() failed");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
# endif
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
utmpx_perform_logout(struct logininfo *li)
|
|
|
|
{
|
|
|
|
struct utmpx utx;
|
|
|
|
|
|
|
|
construct_utmpx(li, &utx);
|
|
|
|
# ifdef HAVE_ID_IN_UTMPX
|
|
|
|
line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id));
|
|
|
|
# endif
|
|
|
|
# ifdef HAVE_TYPE_IN_UTMPX
|
|
|
|
utx.ut_type = DEAD_PROCESS;
|
|
|
|
# endif
|
|
|
|
|
|
|
|
# ifdef UTMPX_USE_LIBRARY
|
|
|
|
utmpx_write_library(li, &utx);
|
|
|
|
# else
|
|
|
|
utmpx_write_direct(li, &utx);
|
|
|
|
# endif
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
utmpx_write_entry(struct logininfo *li)
|
|
|
|
{
|
|
|
|
switch(li->type) {
|
|
|
|
case LTYPE_LOGIN:
|
|
|
|
return utmpx_perform_login(li);
|
|
|
|
case LTYPE_LOGOUT:
|
|
|
|
return utmpx_perform_logout(li);
|
|
|
|
default:
|
|
|
|
log("utmpx_write_entry: invalid type field");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif /* USE_UTMPX */
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
** Low-level wtmp functions
|
|
|
|
**/
|
|
|
|
|
|
|
|
#ifdef USE_WTMP
|
|
|
|
|
|
|
|
/* write a wtmp entry direct to the end of the file */
|
|
|
|
/* This is a slight modification of code in OpenBSD's logwtmp.c */
|
|
|
|
static int
|
|
|
|
wtmp_write(struct logininfo *li, struct utmp *ut)
|
|
|
|
{
|
|
|
|
struct stat buf;
|
|
|
|
int fd, ret = 1;
|
|
|
|
|
|
|
|
if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
|
|
|
|
log("wtmp_write: problem writing %s: %s",
|
|
|
|
WTMP_FILE, strerror(errno));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
if (fstat(fd, &buf) == 0)
|
|
|
|
if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
|
|
|
|
ftruncate(fd, buf.st_size);
|
|
|
|
log("wtmp_write: problem writing %s: %s",
|
|
|
|
WTMP_FILE, strerror(errno));
|
|
|
|
ret = 0;
|
|
|
|
}
|
|
|
|
(void)close(fd);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
wtmp_perform_login(struct logininfo *li)
|
|
|
|
{
|
|
|
|
struct utmp ut;
|
|
|
|
|
|
|
|
construct_utmp(li, &ut);
|
|
|
|
return wtmp_write(li, &ut);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
wtmp_perform_logout(struct logininfo *li)
|
|
|
|
{
|
|
|
|
struct utmp ut;
|
|
|
|
|
|
|
|
construct_utmp(li, &ut);
|
|
|
|
return wtmp_write(li, &ut);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
wtmp_write_entry(struct logininfo *li)
|
|
|
|
{
|
|
|
|
switch(li->type) {
|
|
|
|
case LTYPE_LOGIN:
|
|
|
|
return wtmp_perform_login(li);
|
|
|
|
case LTYPE_LOGOUT:
|
|
|
|
return wtmp_perform_logout(li);
|
|
|
|
default:
|
|
|
|
log("wtmp_write_entry: invalid type field");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* Notes on fetching login data from wtmp/wtmpx
|
|
|
|
*
|
|
|
|
* Logouts are usually recorded with (amongst other things) a blank
|
|
|
|
* username on a given tty line. However, some systems (HP-UX is one)
|
|
|
|
* leave all fields set, but change the ut_type field to DEAD_PROCESS.
|
|
|
|
*
|
|
|
|
* Since we're only looking for logins here, we know that the username
|
|
|
|
* must be set correctly. On systems that leave it in, we check for
|
|
|
|
* ut_type==USER_PROCESS (indicating a login.)
|
|
|
|
*
|
|
|
|
* Portability: Some systems may set something other than USER_PROCESS
|
|
|
|
* to indicate a login process. I don't know of any as I write. Also,
|
|
|
|
* it's possible that some systems may both leave the username in
|
|
|
|
* place and not have ut_type.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* return true if this wtmp entry indicates a login */
|
|
|
|
static int
|
|
|
|
wtmp_islogin(struct logininfo *li, struct utmp *ut)
|
|
|
|
{
|
|
|
|
if (strncmp(li->username, ut->ut_name,
|
|
|
|
MIN_SIZEOF(li->username, ut->ut_name)) == 0) {
|
|
|
|
# ifdef HAVE_TYPE_IN_UTMP
|
|
|
|
if (ut->ut_type & USER_PROCESS)
|
|
|
|
return 1;
|
|
|
|
# else
|
|
|
|
return 1;
|
|
|
|
# endif
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
wtmp_get_entry(struct logininfo *li)
|
|
|
|
{
|
|
|
|
struct stat st;
|
|
|
|
struct utmp ut;
|
|
|
|
int fd, found=0;
|
|
|
|
|
|
|
|
/* Clear the time entries in our logininfo */
|
|
|
|
li->tv_sec = li->tv_usec = 0;
|
|
|
|
|
|
|
|
if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) {
|
|
|
|
log("wtmp_get_entry: problem opening %s: %s",
|
|
|
|
WTMP_FILE, strerror(errno));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
if (fstat(fd, &st) != 0) {
|
|
|
|
log("wtmp_get_entry: couldn't stat %s: %s",
|
|
|
|
WTMP_FILE, strerror(errno));
|
|
|
|
close(fd);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Seek to the start of the last struct utmp */
|
|
|
|
if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) {
|
|
|
|
/* Looks like we've got a fresh wtmp file */
|
|
|
|
close(fd);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
while (!found) {
|
|
|
|
if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) {
|
|
|
|
log("wtmp_get_entry: read of %s failed: %s",
|
|
|
|
WTMP_FILE, strerror(errno));
|
|
|
|
close (fd);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
if ( wtmp_islogin(li, &ut) ) {
|
|
|
|
found = 1;
|
|
|
|
/* We've already checked for a time in struct
|
|
|
|
* utmp, in login_getlast(). */
|
|
|
|
# ifdef HAVE_TIME_IN_UTMP
|
|
|
|
li->tv_sec = ut.ut_time;
|
|
|
|
# else
|
|
|
|
# if HAVE_TV_IN_UTMP
|
|
|
|
li->tv_sec = ut.ut_tv.tv_sec;
|
|
|
|
# endif
|
|
|
|
# endif
|
|
|
|
line_fullname(li->line, ut.ut_line,
|
|
|
|
MIN_SIZEOF(li->line, ut.ut_line));
|
|
|
|
# ifdef HAVE_HOST_IN_UTMP
|
|
|
|
strlcpy(li->hostname, ut.ut_host,
|
|
|
|
MIN_SIZEOF(li->hostname, ut.ut_host));
|
|
|
|
# endif
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
/* Seek back 2 x struct utmp */
|
|
|
|
if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) {
|
|
|
|
/* We've found the start of the file, so quit */
|
|
|
|
close (fd);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* We found an entry. Tidy up and return */
|
|
|
|
close(fd);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
# endif /* USE_WTMP */
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
** Low-level wtmpx functions
|
|
|
|
**/
|
|
|
|
|
|
|
|
#ifdef USE_WTMPX
|
|
|
|
/* write a wtmpx entry direct to the end of the file */
|
|
|
|
/* This is a slight modification of code in OpenBSD's logwtmp.c */
|
|
|
|
static int
|
|
|
|
wtmpx_write(struct logininfo *li, struct utmpx *utx)
|
|
|
|
{
|
|
|
|
struct stat buf;
|
|
|
|
int fd, ret = 1;
|
|
|
|
|
|
|
|
if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
|
|
|
|
log("wtmpx_write: problem opening %s: %s",
|
|
|
|
WTMPX_FILE, strerror(errno));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (fstat(fd, &buf) == 0)
|
|
|
|
if (atomicio(write, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
|
|
|
|
ftruncate(fd, buf.st_size);
|
|
|
|
log("wtmpx_write: problem writing %s: %s",
|
|
|
|
WTMPX_FILE, strerror(errno));
|
|
|
|
ret = 0;
|
|
|
|
}
|
|
|
|
(void)close(fd);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
wtmpx_perform_login(struct logininfo *li)
|
|
|
|
{
|
|
|
|
struct utmpx utx;
|
|
|
|
|
|
|
|
construct_utmpx(li, &utx);
|
|
|
|
return wtmpx_write(li, &utx);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
wtmpx_perform_logout(struct logininfo *li)
|
|
|
|
{
|
|
|
|
struct utmpx utx;
|
|
|
|
|
|
|
|
construct_utmpx(li, &utx);
|
|
|
|
return wtmpx_write(li, &utx);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
wtmpx_write_entry(struct logininfo *li)
|
|
|
|
{
|
|
|
|
switch(li->type) {
|
|
|
|
case LTYPE_LOGIN:
|
|
|
|
return wtmpx_perform_login(li);
|
|
|
|
case LTYPE_LOGOUT:
|
|
|
|
return wtmpx_perform_logout(li);
|
|
|
|
default:
|
|
|
|
log("wtmpx_write_entry: invalid type field");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Please see the notes above wtmp_islogin() for information about the
|
|
|
|
next two functions */
|
|
|
|
|
|
|
|
/* Return true if this wtmpx entry indicates a login */
|
|
|
|
static int
|
|
|
|
wtmpx_islogin(struct logininfo *li, struct utmpx *utx)
|
|
|
|
{
|
|
|
|
if ( strncmp(li->username, utx->ut_name,
|
|
|
|
MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) {
|
|
|
|
# ifdef HAVE_TYPE_IN_UTMPX
|
|
|
|
if (utx->ut_type == USER_PROCESS)
|
|
|
|
return 1;
|
|
|
|
# else
|
|
|
|
return 1;
|
|
|
|
# endif
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
wtmpx_get_entry(struct logininfo *li)
|
|
|
|
{
|
|
|
|
struct stat st;
|
|
|
|
struct utmpx utx;
|
|
|
|
int fd, found=0;
|
|
|
|
|
|
|
|
/* Clear the time entries */
|
|
|
|
li->tv_sec = li->tv_usec = 0;
|
|
|
|
|
|
|
|
if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) {
|
|
|
|
log("wtmpx_get_entry: problem opening %s: %s",
|
|
|
|
WTMPX_FILE, strerror(errno));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
if (fstat(fd, &st) != 0) {
|
|
|
|
log("wtmpx_get_entry: couldn't stat %s: %s",
|
2002-10-29 09:43:00 +00:00
|
|
|
WTMPX_FILE, strerror(errno));
|
2002-06-27 22:31:32 +00:00
|
|
|
close(fd);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Seek to the start of the last struct utmpx */
|
|
|
|
if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) {
|
|
|
|
/* probably a newly rotated wtmpx file */
|
|
|
|
close(fd);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
while (!found) {
|
|
|
|
if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) {
|
|
|
|
log("wtmpx_get_entry: read of %s failed: %s",
|
|
|
|
WTMPX_FILE, strerror(errno));
|
|
|
|
close (fd);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
/* Logouts are recorded as a blank username on a particular line.
|
|
|
|
* So, we just need to find the username in struct utmpx */
|
|
|
|
if ( wtmpx_islogin(li, &utx) ) {
|
2002-10-29 09:43:00 +00:00
|
|
|
found = 1;
|
2002-06-27 22:31:32 +00:00
|
|
|
# ifdef HAVE_TV_IN_UTMPX
|
|
|
|
li->tv_sec = utx.ut_tv.tv_sec;
|
|
|
|
# else
|
|
|
|
# ifdef HAVE_TIME_IN_UTMPX
|
|
|
|
li->tv_sec = utx.ut_time;
|
|
|
|
# endif
|
|
|
|
# endif
|
|
|
|
line_fullname(li->line, utx.ut_line, sizeof(li->line));
|
|
|
|
# ifdef HAVE_HOST_IN_UTMPX
|
|
|
|
strlcpy(li->hostname, utx.ut_host,
|
|
|
|
MIN_SIZEOF(li->hostname, utx.ut_host));
|
|
|
|
# endif
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) {
|
|
|
|
close (fd);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
close(fd);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
#endif /* USE_WTMPX */
|
|
|
|
|
|
|
|
/**
|
|
|
|
** Low-level libutil login() functions
|
|
|
|
**/
|
|
|
|
|
|
|
|
#ifdef USE_LOGIN
|
|
|
|
static int
|
|
|
|
syslogin_perform_login(struct logininfo *li)
|
|
|
|
{
|
|
|
|
struct utmp *ut;
|
|
|
|
|
|
|
|
if (! (ut = (struct utmp *)malloc(sizeof(*ut)))) {
|
|
|
|
log("syslogin_perform_login: couldn't malloc()");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
construct_utmp(li, ut);
|
|
|
|
login(ut);
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
syslogin_perform_logout(struct logininfo *li)
|
|
|
|
{
|
|
|
|
# ifdef HAVE_LOGOUT
|
|
|
|
char line[8];
|
|
|
|
|
|
|
|
(void)line_stripname(line, li->line, sizeof(line));
|
|
|
|
|
|
|
|
if (!logout(line)) {
|
|
|
|
log("syslogin_perform_logout: logout() returned an error");
|
|
|
|
# ifdef HAVE_LOGWTMP
|
|
|
|
} else {
|
|
|
|
logwtmp(line, "", "");
|
|
|
|
# endif
|
|
|
|
}
|
|
|
|
/* FIXME: (ATL - if the need arises) What to do if we have
|
|
|
|
* login, but no logout? what if logout but no logwtmp? All
|
|
|
|
* routines are in libutil so they should all be there,
|
|
|
|
* but... */
|
|
|
|
# endif
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
syslogin_write_entry(struct logininfo *li)
|
|
|
|
{
|
|
|
|
switch (li->type) {
|
|
|
|
case LTYPE_LOGIN:
|
|
|
|
return syslogin_perform_login(li);
|
|
|
|
case LTYPE_LOGOUT:
|
|
|
|
return syslogin_perform_logout(li);
|
|
|
|
default:
|
|
|
|
log("syslogin_write_entry: Invalid type field");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif /* USE_LOGIN */
|
|
|
|
|
|
|
|
/* end of file log-syslogin.c */
|
|
|
|
|
|
|
|
/**
|
|
|
|
** Low-level lastlog functions
|
|
|
|
**/
|
|
|
|
|
|
|
|
#ifdef USE_LASTLOG
|
|
|
|
#define LL_FILE 1
|
|
|
|
#define LL_DIR 2
|
|
|
|
#define LL_OTHER 3
|
|
|
|
|
|
|
|
static void
|
|
|
|
lastlog_construct(struct logininfo *li, struct lastlog *last)
|
|
|
|
{
|
|
|
|
/* clear the structure */
|
|
|
|
memset(last, '\0', sizeof(*last));
|
|
|
|
|
|
|
|
(void)line_stripname(last->ll_line, li->line, sizeof(last->ll_line));
|
|
|
|
strlcpy(last->ll_host, li->hostname,
|
|
|
|
MIN_SIZEOF(last->ll_host, li->hostname));
|
|
|
|
last->ll_time = li->tv_sec;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
lastlog_filetype(char *filename)
|
|
|
|
{
|
|
|
|
struct stat st;
|
|
|
|
|
|
|
|
if (stat(LASTLOG_FILE, &st) != 0) {
|
|
|
|
log("lastlog_perform_login: Couldn't stat %s: %s", LASTLOG_FILE,
|
|
|
|
strerror(errno));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
if (S_ISDIR(st.st_mode))
|
|
|
|
return LL_DIR;
|
|
|
|
else if (S_ISREG(st.st_mode))
|
|
|
|
return LL_FILE;
|
|
|
|
else
|
|
|
|
return LL_OTHER;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* open the file (using filemode) and seek to the login entry */
|
|
|
|
static int
|
|
|
|
lastlog_openseek(struct logininfo *li, int *fd, int filemode)
|
|
|
|
{
|
|
|
|
off_t offset;
|
|
|
|
int type;
|
|
|
|
char lastlog_file[1024];
|
|
|
|
|
|
|
|
type = lastlog_filetype(LASTLOG_FILE);
|
|
|
|
switch (type) {
|
|
|
|
case LL_FILE:
|
|
|
|
strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file));
|
|
|
|
break;
|
|
|
|
case LL_DIR:
|
|
|
|
snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s",
|
|
|
|
LASTLOG_FILE, li->username);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
log("lastlog_openseek: %.100s is not a file or directory!",
|
|
|
|
LASTLOG_FILE);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
*fd = open(lastlog_file, filemode);
|
|
|
|
if ( *fd < 0) {
|
|
|
|
debug("lastlog_openseek: Couldn't open %s: %s",
|
|
|
|
lastlog_file, strerror(errno));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (type == LL_FILE) {
|
|
|
|
/* find this uid's offset in the lastlog file */
|
|
|
|
offset = (off_t) ((long)li->uid * sizeof(struct lastlog));
|
|
|
|
|
|
|
|
if ( lseek(*fd, offset, SEEK_SET) != offset ) {
|
|
|
|
log("lastlog_openseek: %s->lseek(): %s",
|
|
|
|
lastlog_file, strerror(errno));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
lastlog_perform_login(struct logininfo *li)
|
|
|
|
{
|
|
|
|
struct lastlog last;
|
|
|
|
int fd;
|
|
|
|
|
|
|
|
/* create our struct lastlog */
|
|
|
|
lastlog_construct(li, &last);
|
|
|
|
|
|
|
|
if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT))
|
|
|
|
return(0);
|
|
|
|
|
|
|
|
/* write the entry */
|
|
|
|
if (atomicio(write, fd, &last, sizeof(last)) != sizeof(last)) {
|
|
|
|
close(fd);
|
|
|
|
log("lastlog_write_filemode: Error writing to %s: %s",
|
|
|
|
LASTLOG_FILE, strerror(errno));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
close(fd);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
lastlog_write_entry(struct logininfo *li)
|
|
|
|
{
|
|
|
|
switch(li->type) {
|
|
|
|
case LTYPE_LOGIN:
|
|
|
|
return lastlog_perform_login(li);
|
|
|
|
default:
|
|
|
|
log("lastlog_write_entry: Invalid type field");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
lastlog_populate_entry(struct logininfo *li, struct lastlog *last)
|
|
|
|
{
|
|
|
|
line_fullname(li->line, last->ll_line, sizeof(li->line));
|
|
|
|
strlcpy(li->hostname, last->ll_host,
|
|
|
|
MIN_SIZEOF(li->hostname, last->ll_host));
|
|
|
|
li->tv_sec = last->ll_time;
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
lastlog_get_entry(struct logininfo *li)
|
|
|
|
{
|
|
|
|
struct lastlog last;
|
|
|
|
int fd;
|
|
|
|
|
|
|
|
if (!lastlog_openseek(li, &fd, O_RDONLY))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (atomicio(read, fd, &last, sizeof(last)) != sizeof(last)) {
|
|
|
|
close(fd);
|
|
|
|
log("lastlog_get_entry: Error reading from %s: %s",
|
|
|
|
LASTLOG_FILE, strerror(errno));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
close(fd);
|
|
|
|
|
|
|
|
lastlog_populate_entry(li, &last);
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
#endif /* USE_LASTLOG */
|