158 lines
4.0 KiB
C
158 lines
4.0 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_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 */
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# if defined( SYSLOG_SUCCESS ) && defined( SYSLOG_FAILURE )
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static void log_su (const char *successful, const char *old_user, const char *tty)
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{
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syslog ( LOG_NOTICE, "%s%s on %s", successful, old_user, tty);
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}
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# define log_su_successful(cu, u, tty) if(!cu) log_su("", u, tty)
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# define log_su_failure(cu, u, tty) if(!cu) log_su("FAILED SU ", u, tty)
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# else
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/* partial logging */
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# if !defined( SYSLOG_SUCESS )
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# define log_su_successful(cu, u, tty)
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# define log_su_failure(cu, u, t) if(!cu) \
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syslog(LOG_NOTICE, "FAILED SU %s on %s", u, t)
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# else
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# define log_su_successful(cu, u, t) if(!cu) \
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syslog(LOG_NOTICE, "%s on %s", u, t)
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# define log_su_failure(cu, u, tty)
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# endif
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# endif
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#else
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/* logging not used */
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# define log_su_successful(cu, u, tty)
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# define log_su_failure(cu, u, tty)
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#endif
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int su_main ( int argc, char **argv )
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{
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unsigned long flags;
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int opt_preserve;
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int opt_loginshell;
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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;
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uid_t cur_uid = getuid();
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#if defined( SYSLOG_SUCCESS ) || defined( SYSLOG_FAILURE )
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const char *tty;
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const char *old_user;
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#endif
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flags = bb_getopt_ulflags(argc, argv, "mplc:s:",
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&opt_command, &opt_shell);
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opt_preserve = flags & 3;
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opt_loginshell = (flags & 4 ? 1 : 0);
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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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#if defined( SYSLOG_SUCCESS ) || defined( SYSLOG_FAILURE )
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#ifdef CONFIG_FEATURE_U_W_TMP
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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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#endif
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{
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/* getlogin can fail -- usually due to lack of utmp entry. Resort to getpwuid. */
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pw = getpwuid ( cur_uid );
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old_user = ( pw ? pw->pw_name : "" );
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}
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tty = ttyname ( 2 );
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if(!tty)
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tty = "none";
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openlog ( bb_applet_name, 0, LOG_AUTH );
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#endif
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pw = getpwnam ( opt_username );
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if ( !pw )
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bb_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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if ((( cur_uid == 0 ) || correct_password ( pw ))) {
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log_su_successful(pw->pw_uid, old_user, tty );
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} else {
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log_su_failure (pw->pw_uid, old_user, tty );
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bb_error_msg_and_die ( "incorrect password" );
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}
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#if defined( SYSLOG_SUCCESS ) || defined( SYSLOG_FAILURE )
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closelog();
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#endif
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if ( !opt_shell && opt_preserve )
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opt_shell = getenv ( "SHELL" );
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if ( opt_shell && cur_uid && restricted_shell ( pw-> pw_shell )) {
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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 = 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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#ifdef CONFIG_SELINUX
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, 0
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#endif
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);
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return EXIT_FAILURE;
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}
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