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Linux Cubed Series 7: Sunsite
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Linux Cubed Series 7 - Sunsite Vol 1.iso
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sudo-1.000
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sudo-1
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sudo-1.2
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sudo.c
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C/C++ Source or Header
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1993-12-05
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/*
* sudo version 1.1 allows users to execute commands as root
* Copyright (C) 1991 The Root Group, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 1, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* If you make modifications to the source, we would be happy to have
* them to include in future releases. Feel free to send them to:
* Jeff Nieusma nieusma@rootgroup.com
* 3959 Arbol CT (303) 447-8093
* Boulder, CO 80301-1752
*
**************************************************************************
*
* sudo.c
*
* This is the main() routine for sudo
*
* sudo is a program to allow users to execute commands
* as root. The commands are defined in a global network-
* wide file and can be distributed.
*
* sudo has been hacked far and wide. Too many people to
* know about. It's about time to come up with a secure
* version that will work well in a network.
*
* This most recent version is done by:
*
* Jeff Nieusma <nieusma@rootgroup.com>
* Dave Hieb <davehieb@rootgroup.com>
*/
#define MAIN
#include <stdio.h>
#include <string.h>
#include <strings.h>
#ifdef LINUX
#include <sys/types.h>
#endif /* LINUX */
#include <pwd.h>
#include <netdb.h>
#include <sys/param.h>
#include "sudo.h"
extern char *malloc();
int Argc;
char **Argv;
char *host;
char *user;
char *cmnd;
#ifdef MULTIMAX
unsigned short uid;
#else
uid_t uid;
#endif
/********************************************************************
*
* main ()
*
* the driving force behind sudo...
*/
main(argc, argv)
int argc; char **argv;
{
static void usage();
int rtn;
Argv=argv;
Argc=argc;
/* if nothing is passed, we don't need to do anything... */
if ( argc < 2 ) usage();
/* close all file descriptors to make sure we have a nice
* clean slate from which to work.
*/
for ( rtn = getdtablesize() - 1 ; rtn > 3; rtn -- )
(void)close(rtn);
load_globals(); /* load the user host cmnd and uid variables */
if ( setuid(0) ) {
perror("setuid(0)");
exit(1);
}
rtn=validate();
#ifdef LINUX
if ( setreuid(uid) ) {
#else
if ( setruid(uid) ) {
#endif
perror("setruid(uid)");
exit(1);
}
switch ( rtn ) {
case VALIDATE_OK:
check_user();
log_error( ALL_SYSTEMS_GO );
if ( setuid(0) ) {
perror("setuid(0)");
exit(1);
}
execv(cmnd, &Argv[1]);
break;
case VALIDATE_NO_USER:
case VALIDATE_NOT_OK:
case VALIDATE_ERROR:
default:
log_error ( rtn );
if ( setuid ( uid ) ) {
perror("setuid(uid)");
exit(1);
}
inform_user ( rtn );
exit (1);
break;
}
}
/**********************************************************************
*
* load_globals()
*
* This function primes the important global variables:
* user, host, cmnd, uid
*/
void load_globals()
{
struct passwd *pw_ent;
struct hostent *h_ent;
char path[MAXPATHLEN+1];
char *p;
if ( (user=malloc(9)) == NULL ) {
perror ("malloc");
exit (1);
}
if ( (host=malloc(MAXHOSTNAMELEN+1)) == NULL ) {
perror ("malloc");
exit (1);
}
uid = getuid(); /* we need to tuck this away for safe keeping */
/* loading the cmnd global variable from argv[1] */
strncpy(path, Argv[1], MAXPATHLEN)[MAXPATHLEN] = 0;
cmnd = find_path ( path ); /* get the absolute path */
if ( cmnd == NULL ) {
fprintf ( stderr, "%s: %s: command not found\n", Argv[0], Argv[1] );
exit (1);
}
cmnd = strdup ( cmnd );
#ifdef NO_ROOT_SUDO
if ( uid == 0 ) {
fprintf(stderr, "You are already root, you don\'t need to use sudo.\n");
exit (1);
}
#endif
/* loading the user global variable from the passwd file */
if ( (pw_ent = getpwuid( uid )) == NULL ) {
sprintf ( user, "%u", uid );
log_error( GLOBAL_NO_PW_ENT );
inform_user ( GLOBAL_NO_PW_ENT );
exit (1);
}
strncpy ( user, pw_ent -> pw_name, 8 ) [8] = '\0';
/* loading the host global variable from gethostname() & gethostbyname() */
if (( gethostname ( host, MAXHOSTNAMELEN ))) {
strcpy ( host, "amnesiac" );
log_error ( GLOBAL_NO_HOSTNAME );
inform_user ( GLOBAL_NO_HOSTNAME );
}
else {
if ( ( h_ent = gethostbyname ( host) ) == NULL )
log_error ( GLOBAL_HOST_UNREGISTERED );
else
strcpy ( host, h_ent -> h_name );
/* We don't want to return the fully quallified name all the time... */
#ifndef FQDN
if ( (p = index ( host, '.' )) ) *p='\0';
#endif
}
}
/**********************************************************************
*
* usage()
*
* this function just gives you instructions and exits
*/
static void usage()
{
fprintf( stderr, "usage: %s command\n", *Argv);
exit (1);
}