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check_wtmpx.c
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check_wtmpx.c
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/*
* @(#)check_wtmpx.c 0.02 beta 2001/06/27 NsFocus Copyleft 2001-2010
*------------------------------------------------------------------------
* File : check_wtmpx.c
* Version : 0.02 beta
* Platform : SPARC/Solaris 2.6/7
* Author : NsFocus Security Team
* : http://www.nsfocus.com
* Fix : scz < mailto: scz@nsfocus.com >
* Compile : gcc -Wall -O3 -o check_wtmpx check_wtmpx.c
* : /usr/ccs/bin/strip check_wtmpx
* : /usr/ccs/bin/mcs -d check_wtmpx
* Date : 2001-06-27 11:36
*/
#if !defined(__SunOS__) && !defined(SOLARIS2)
int main () { return 0; }
#else
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/file.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <time.h>
#include <utmp.h>
#include <utmpx.h>
#include <lastlog.h>
#include <fcntl.h>
#include <unistd.h>
#define WTMP_FILENAME "/var/adm/wtmp"
#define WTMPX_FILENAME "/var/adm/wtmpx"
struct file_utmp_entry
{
char ut_user[8]; /* User login name */
char ut_id[4]; /* /etc/inittab id */
char ut_line[12]; /* device name (console, lnxx) */
int16_t ut_pid; /* process id */
int16_t ut_type; /* type of entry */
struct
{
int16_t e_termination; /* Process termination status */
int16_t e_exit; /* Process exit status */
} ut_exit; /* The exit status of a process */
uint32_t ut_time; /* time entry was made */
};
struct timeval_32
{
uint32_t tv_sec; /* seconds */
int32_t tv_usec; /* and microseconds */
};
/*
* This data structure describes the utmp *file* contents using
* fixed-width data types. It should only be used by the implementation.
*
* Applications should use the getutxent(3c) family of routines to interact
* with this database.
*/
struct file_utmpx_entry
{
char ut_user[32]; /* user login name */
char ut_id[4]; /* inittab id */
char ut_line[32]; /* device name (console, lnxx) */
uint32_t ut_pid; /* process id */
int16_t ut_type; /* type of entry */
struct
{
int16_t e_termination; /* process termination status */
int16_t e_exit; /* process exit status */
} ut_exit; /* exit status of a process */
struct timeval_32 ut_tv; /* time entry was made */
int32_t ut_session; /* session ID, user for windowing */
int32_t pad[5]; /* reserved for future use */
int16_t ut_syslen; /* significant length of ut_host */
char ut_host[257]; /* remote host name */
};
static void usage ( char * arg )
{
fprintf( stderr, " Usage: %s [-h] [-w wtmp] [-x wtmpx]\n", arg );
exit( EXIT_FAILURE );
} /* end of usage */
int main ( int argc, char * argv[] )
{
int fd_wtmp, fd_wtmpx;
char filename_wtmp[128] = WTMP_FILENAME;
char filename_wtmpx[128] = WTMPX_FILENAME;
ssize_t wtmp_bytes_read;
ssize_t wtmpx_bytes_read;
uint32_t wtmp_read_counter = 0;
uint32_t wtmpx_read_counter = 0;
int c;
struct file_utmp_entry utmp_entry;
struct file_utmpx_entry utmpx_entry;
opterr = 0; /* Don't want getopt() writing to stderr */
while ( ( c = getopt( argc, argv, "hw:x:" ) ) != EOF )
{
switch ( c )
{
case 'w':
strncpy( filename_wtmp, optarg, 128 );
filename_wtmp[127] = '\0';
break;
case 'x':
strncpy( filename_wtmpx, optarg, 128 );
filename_wtmpx[127] = '\0';
break;
case 'h':
case '?':
usage( argv[0] );
break;
} /* end of switch */
} /* end of while */
fd_wtmp = open( filename_wtmp, O_RDONLY );
if ( fd_wtmp < 0 )
{
fprintf( stderr, "Unable to open %s\n", filename_wtmp );
return( EXIT_FAILURE );
}
fd_wtmpx = open( filename_wtmpx, O_RDONLY );
if ( fd_wtmpx < 0 )
{
fprintf( stderr, "Unable to open %s\n", filename_wtmpx );
close( fd_wtmp );
return( EXIT_FAILURE );
}
while ( 1 )
{
wtmpx_bytes_read = read( fd_wtmpx, &utmpx_entry, sizeof( struct file_utmpx_entry ) );
if ( wtmpx_bytes_read > 0 )
{
if ( wtmpx_bytes_read < sizeof( struct file_utmpx_entry ) )
{
fprintf( stderr, "wtmpx entry may be corrupted\n" );
break;
}
wtmpx_read_counter++;
}
wtmp_bytes_read = read( fd_wtmp, &utmp_entry, sizeof( struct file_utmp_entry ) );
if ( wtmp_bytes_read > 0 )
{
if ( wtmp_bytes_read < sizeof( struct file_utmp_entry ) )
{
fprintf( stderr, "wtmp entry may be corrupted\n" );
break;
}
wtmp_read_counter++;
}
if ( ( wtmpx_bytes_read <= 0 ) || ( wtmp_bytes_read <= 0 ) )
{
break;
}
if ( strncmp( utmp_entry.ut_user, utmpx_entry.ut_user, 8 ) != 0 )
{
fprintf( stderr, "[ %u ] ut_user %s <-> %s\n", wtmp_read_counter,
utmp_entry.ut_user, utmpx_entry.ut_user );
break;
}
if ( memcmp( utmp_entry.ut_id, utmpx_entry.ut_id, 4 ) != 0 )
{
fprintf( stderr, "[ %u ] utmp_entry.ut_id != utmpx_entry.ut_id\n", wtmp_read_counter );
break;
}
if ( strcmp( utmp_entry.ut_line, utmpx_entry.ut_line ) != 0 )
{
fprintf( stderr, "[ %u ] ut_line %s <-> %s\n", wtmp_read_counter,
utmp_entry.ut_line, utmpx_entry.ut_line );
break;
}
if ( utmp_entry.ut_pid != utmpx_entry.ut_pid )
{
fprintf( stderr, "[ %u ] ut_pid %d <-> %d\n", wtmp_read_counter,
utmp_entry.ut_pid, utmpx_entry.ut_pid );
break;
}
if ( utmp_entry.ut_type != utmpx_entry.ut_type )
{
fprintf( stderr, "[ %u ] ut_type %d <-> %d\n", wtmp_read_counter,
utmp_entry.ut_type, utmpx_entry.ut_type );
break;
}
if ( utmp_entry.ut_time != utmpx_entry.ut_tv.tv_sec )
{
fprintf( stderr, "[ %u ] ut_time %08X <-> %08X\n", wtmp_read_counter,
utmp_entry.ut_time, utmpx_entry.ut_tv.tv_sec );
break;
}
} /* end of while */
if ( wtmpx_read_counter != wtmp_read_counter )
{
fprintf( stderr, "wtmpx or wtmp entry may be deleted\n" );
}
close( fd_wtmpx );
close( fd_wtmp );
return( EXIT_SUCCESS );
} /* end of main */
#endif