163 lines
3.8 KiB
C
163 lines
3.8 KiB
C
/* vi: set sw=4 ts=4: */
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <termios.h>
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#include <unistd.h>
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#include <utmp.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <ctype.h>
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#include <time.h>
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#include "busybox.h"
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/* The shell to run if none is given in the user's passwd entry. */
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#define DEFAULT_SHELL "/bin/sh"
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#define DEFAULT_USER "root"
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//#define SYSLOG_SUCCESS
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#define SYSLOG_FAILURE
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#if defined( SYSLOG_SUCCESS ) || defined( SYSLOG_FAILURE )
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/* Log the fact that someone has run su to the user given by PW;
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if SUCCESSFUL is nonzero, they gave the correct password, etc. */
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static void log_su ( const struct passwd *pw, int successful )
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{
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const char *old_user, *tty;
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#if !defined( SYSLOG_SUCESS )
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if ( successful )
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return;
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#endif
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#if !defined( SYSLOG_FAILURE )
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if ( !successful )
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return;
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#endif
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if ( pw-> pw_uid ) // not to root -> ignored
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return;
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/* The utmp entry (via getlogin) is probably the best way to identify
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the user, especially if someone su's from a su-shell. */
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old_user = getlogin ( );
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if ( !old_user ) {
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/* getlogin can fail -- usually due to lack of utmp entry. Resort to getpwuid. */
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struct passwd *pwd = getpwuid ( getuid ( ));
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old_user = ( pwd ? pwd-> pw_name : "" );
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}
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tty = ttyname ( 2 );
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openlog ( "su", 0, LOG_AUTH );
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syslog ( LOG_NOTICE, "%s%s on %s", successful ? "" : "FAILED SU ", old_user, tty ? tty : "none" );
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}
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#endif
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int su_main ( int argc, char **argv )
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{
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int flag;
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int opt_preserve = 0;
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int opt_loginshell = 0;
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char *opt_shell = 0;
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char *opt_command = 0;
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char *opt_username = DEFAULT_USER;
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char **opt_args = 0;
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struct passwd *pw, pw_copy;
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while (( flag = getopt ( argc, argv, "c:lmps:" )) != -1 ) {
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switch ( flag ) {
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case 'c':
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opt_command = optarg;
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break;
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case 'm':
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case 'p':
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opt_preserve = 1;
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break;
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case 's':
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opt_shell = optarg;
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break;
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case 'l':
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opt_loginshell = 1;
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break;
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default:
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show_usage ( );
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break;
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}
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}
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if (( optind < argc ) && ( argv [optind][0] == '-' ) && ( argv [optind][1] == 0 )) {
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opt_loginshell = 1;
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++optind;
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}
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/* get user if specified */
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if ( optind < argc )
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opt_username = argv [optind++];
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if ( optind < argc )
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opt_args = argv + optind;
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pw = getpwnam ( opt_username );
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if ( !pw )
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error_msg_and_die ( "user %s does not exist", opt_username );
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/* Make sure pw->pw_shell is non-NULL. It may be NULL when NEW_USER
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is a username that is retrieved via NIS (YP), but that doesn't have
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a default shell listed. */
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if ( !pw-> pw_shell || !pw->pw_shell [0] )
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pw-> pw_shell = (char *) DEFAULT_SHELL;
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/* Make a copy of the password information and point pw at the local
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copy instead. Otherwise, some systems (e.g. Linux) would clobber
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the static data through the getlogin call from log_su. */
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pw_copy = *pw;
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pw = &pw_copy;
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pw-> pw_name = xstrdup ( pw-> pw_name );
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pw-> pw_dir = xstrdup ( pw-> pw_dir );
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pw-> pw_shell = xstrdup ( pw-> pw_shell );
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if (( getuid ( ) == 0 ) || correct_password ( pw ))
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log_su ( pw, 1 );
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else {
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log_su ( pw, 0 );
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error_msg_and_die ( "incorrect password" );
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}
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if ( !opt_shell && opt_preserve )
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opt_shell = getenv ( "SHELL" );
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if ( opt_shell && getuid ( ) && restricted_shell ( pw-> pw_shell ))
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{
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/* The user being su'd to has a nonstandard shell, and so is
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probably a uucp account or has restricted access. Don't
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compromise the account by allowing access with a standard
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shell. */
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fputs ( "using restricted shell\n", stderr );
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opt_shell = 0;
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}
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if ( !opt_shell )
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opt_shell = xstrdup ( pw-> pw_shell );
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change_identity ( pw );
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setup_environment ( opt_shell, opt_loginshell, !opt_preserve, pw );
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run_shell ( opt_shell, opt_loginshell, opt_command, (const char**)opt_args );
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return EXIT_FAILURE;
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}
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