/* vi: set sw=4 ts=4: */
-
-#include "busybox.h"
+/*
+ Licensed under the GPL v2, see the file LICENSE in this tarball.
+*/
#include <fcntl.h>
#include <signal.h>
#include <utmp.h>
#include <sys/resource.h>
#include <sys/stat.h>
-#include <sys/time.h>
#include <sys/types.h>
#include <ctype.h>
#include <time.h>
-#include "pwd.h"
-#include "grp.h"
-
-#include "tinylogin.h"
-
-
+#include "busybox.h"
/* The shell to run if none is given in the user's passwd entry. */
+#ifndef DEFAULT_SHELL
#define DEFAULT_SHELL "/bin/sh"
+#endif
+
+/* Default user. */
#define DEFAULT_USER "root"
-//#define SYSLOG_SUCCESS
+/* #define SYSLOG_SUCCESS */
#define SYSLOG_FAILURE
#if defined( SYSLOG_SUCCESS ) || defined( SYSLOG_FAILURE )
-/* Log the fact that someone has run su to the user given by PW;
- if SUCCESSFUL is nonzero, they gave the correct password, etc. */
+/* Log the fact that someone has run su */
-static void log_su ( const struct passwd *pw, int successful )
+# if defined( SYSLOG_SUCCESS ) && defined( SYSLOG_FAILURE )
+static void log_su (const char *successful, const char *old_user,
+ const char *tty)
{
- const char *old_user, *tty;
-
-#if !defined( SYSLOG_SUCESS )
- if ( successful )
- return;
-#endif
-#if !defined( SYSLOG_FAILURE )
- if ( !successful )
- return;
-#endif
-
- if ( pw-> pw_uid ) // not to root -> ignored
- return;
-
- /* The utmp entry (via getlogin) is probably the best way to identify
- the user, especially if someone su's from a su-shell. */
- old_user = getlogin ( );
- if ( !old_user ) {
- /* getlogin can fail -- usually due to lack of utmp entry. Resort to getpwuid. */
- struct passwd *pwd = getpwuid ( getuid ( ));
- old_user = ( pwd ? pwd-> pw_name : "" );
- }
-
- tty = ttyname ( 2 );
-
- openlog ( "su", 0, LOG_AUTH );
- syslog ( LOG_NOTICE, "%s%s on %s", successful ? "" : "FAILED SU ", old_user, tty ? tty : "none" );
+ syslog ( LOG_NOTICE, "%s%s on %s", successful, old_user, tty);
}
+# define log_su_successful(cu, u, tty) if(!cu) log_su("", u, tty)
+# define log_su_failure(cu, u, tty) if(!cu) log_su("FAILED SU ", u, tty)
+# else
+ /* partial logging */
+# if !defined( SYSLOG_SUCESS )
+# define log_su_successful(cu, u, tty)
+# define log_su_failure(cu, u, t) if(!cu) \
+ syslog(LOG_NOTICE, "FAILED SU %s on %s", u, t)
+# else
+# define log_su_successful(cu, u, t) if(!cu) \
+ syslog(LOG_NOTICE, "%s on %s", u, t)
+# define log_su_failure(cu, u, tty)
+# endif
+# endif
+#else
+ /* logging not used */
+# define log_su_successful(cu, u, tty)
+# define log_su_failure(cu, u, tty)
#endif
-
int su_main ( int argc, char **argv )
{
- int flag;
- int opt_preserve = 0;
- int opt_loginshell = 0;
+ unsigned long flags;
+ int opt_preserve;
+ int opt_loginshell;
char *opt_shell = 0;
char *opt_command = 0;
char *opt_username = DEFAULT_USER;
char **opt_args = 0;
- struct passwd *pw, pw_copy;
-
-
- while (( flag = getopt ( argc, argv, "c:lmps:" )) != -1 ) {
- switch ( flag ) {
- case 'c':
- opt_command = optarg;
- break;
- case 'm':
- case 'p':
- opt_preserve = 1;
- break;
- case 's':
- opt_shell = optarg;
- break;
- case 'l':
- opt_loginshell = 1;
- break;
- default:
- show_usage ( );
- break;
- }
- }
+ struct passwd *pw;
+ uid_t cur_uid = getuid();
- if (( optind < argc ) && ( argv [optind][0] == '-' ) && ( argv [optind][1] == 0 )) {
+#if defined( SYSLOG_SUCCESS ) || defined( SYSLOG_FAILURE )
+ const char *tty;
+ const char *old_user;
+#endif
+
+ flags = bb_getopt_ulflags(argc, argv, "mplc:s:",
+ &opt_command, &opt_shell);
+ opt_preserve = flags & 3;
+ opt_loginshell = (flags & 4 ? 1 : 0);
+
+ if (optind < argc && argv[optind][0] == '-' && argv[optind][1] == 0) {
opt_loginshell = 1;
++optind;
}
/* get user if specified */
- if ( optind < argc )
+ if ( optind < argc )
opt_username = argv [optind++];
if ( optind < argc )
opt_args = argv + optind;
-
-
+
+#if defined( SYSLOG_SUCCESS ) || defined( SYSLOG_FAILURE )
+#ifdef CONFIG_FEATURE_UTMP
+ /* The utmp entry (via getlogin) is probably the best way to identify
+ the user, especially if someone su's from a su-shell. */
+ old_user = getlogin ( );
+ if ( !old_user )
+#endif
+ {
+ /* getlogin can fail -- usually due to lack of utmp entry.
+ Resort to getpwuid. */
+ pw = getpwuid ( cur_uid );
+ old_user = ( pw ? pw->pw_name : "" );
+ }
+ tty = ttyname ( 2 );
+ if(!tty)
+ tty = "none";
+
+ openlog ( bb_applet_name, 0, LOG_AUTH );
+#endif
+
pw = getpwnam ( opt_username );
if ( !pw )
- error_msg_and_die ( "user %s does not exist", opt_username );
-
+ bb_error_msg_and_die ( "user %s does not exist", opt_username );
+
/* Make sure pw->pw_shell is non-NULL. It may be NULL when NEW_USER
is a username that is retrieved via NIS (YP), but that doesn't have
a default shell listed. */
- if ( !pw-> pw_shell || !pw->pw_shell [0] )
- pw-> pw_shell = (char *) DEFAULT_SHELL;
-
- /* Make a copy of the password information and point pw at the local
- copy instead. Otherwise, some systems (e.g. Linux) would clobber
- the static data through the getlogin call from log_su. */
- pw_copy = *pw;
- pw = &pw_copy;
- pw-> pw_name = xstrdup ( pw-> pw_name );
- pw-> pw_dir = xstrdup ( pw-> pw_dir );
- pw-> pw_shell = xstrdup ( pw-> pw_shell );
-
- if (( getuid ( ) == 0 ) || correct_password ( pw ))
- log_su ( pw, 1 );
- else {
- log_su ( pw, 0 );
- error_msg_and_die ( "incorrect password" );
+ if ( !pw->pw_shell || !pw->pw_shell [0] )
+ pw->pw_shell = (char *) DEFAULT_SHELL;
+
+ if ((( cur_uid == 0 ) || correct_password ( pw ))) {
+ log_su_successful(pw->pw_uid, old_user, tty );
+ } else {
+ log_su_failure (pw->pw_uid, old_user, tty );
+ bb_error_msg_and_die ( "incorrect password" );
}
+#if defined( SYSLOG_SUCCESS ) || defined( SYSLOG_FAILURE )
+ closelog();
+#endif
+
if ( !opt_shell && opt_preserve )
opt_shell = getenv ( "SHELL" );
- if ( opt_shell && getuid ( ) && restricted_shell ( pw-> pw_shell ))
- {
+ if ( opt_shell && cur_uid && restricted_shell ( pw->pw_shell )) {
/* The user being su'd to has a nonstandard shell, and so is
probably a uucp account or has restricted access. Don't
compromise the account by allowing access with a standard
}
if ( !opt_shell )
- opt_shell = xstrdup ( pw-> pw_shell );
+ opt_shell = pw->pw_shell;
- change_identity ( pw );
+ change_identity ( pw );
setup_environment ( opt_shell, opt_loginshell, !opt_preserve, pw );
- run_shell ( opt_shell, opt_loginshell, opt_command, opt_args );
-
+#if ENABLE_SELINUX
+ set_current_security_context(NULL);
+#endif
+ run_shell ( opt_shell, opt_loginshell, opt_command, (const char**)opt_args);
+
return EXIT_FAILURE;
}
projects / oweals / busybox.git / blobdiff