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-rw-r--r--loginutils/Config.in7
-rw-r--r--loginutils/su.c154
2 files changed, 50 insertions, 111 deletions
diff --git a/loginutils/Config.in b/loginutils/Config.in
index 3bbb6d90c..e920d5fc3 100644
--- a/loginutils/Config.in
+++ b/loginutils/Config.in
@@ -142,6 +142,13 @@ config CONFIG_SU
Note that Busybox binary must be setuid root for this applet to
work properly.
+config CONFIG_SU_SYSLOG
+ bool "Support for syslog in su"
+ default y
+ depends on CONFIG_SU
+ help
+ Enables support for syslog in su.
+
config CONFIG_SULOGIN
bool "sulogin"
default n
diff --git a/loginutils/su.c b/loginutils/su.c
index 1273831ff..bd3e7c566 100644
--- a/loginutils/su.c
+++ b/loginutils/su.c
@@ -1,86 +1,31 @@
/* vi: set sw=4 ts=4: */
/*
- Licensed under the GPL v2, see the file LICENSE in this tarball.
-*/
+ * Mini su implementation for busybox
+ *
+ * Licensed under the GPL v2, see the file LICENSE in this tarball.
+ */
-#include <fcntl.h>
+#include "busybox.h"
#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
#include <syslog.h>
-#include <termios.h>
-#include <unistd.h>
-#include <utmp.h>
#include <sys/resource.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <ctype.h>
#include <time.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_FAILURE
-
-
-#if defined( SYSLOG_SUCCESS ) || defined( SYSLOG_FAILURE )
-/* Log the fact that someone has run su */
-
-# if defined( SYSLOG_SUCCESS ) && defined( SYSLOG_FAILURE )
-static void log_su (const char *successful, const char *old_user,
- const char *tty)
-{
- 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 )
{
unsigned long flags;
char *opt_shell = 0;
char *opt_command = 0;
- char *opt_username = DEFAULT_USER;
+ char *opt_username = "root";
char **opt_args = 0;
struct passwd *pw;
uid_t cur_uid = getuid();
-
-#if defined( SYSLOG_SUCCESS ) || defined( SYSLOG_FAILURE )
const char *tty;
- const char *old_user;
-#endif
+ char *old_user;
- flags = bb_getopt_ulflags(argc, argv, "mplc:s:",
- &opt_command, &opt_shell);
-#define SU_OPT_m (3)
-#define SU_OPT_p (3)
+ flags = bb_getopt_ulflags(argc, argv, "mplc:s:", &opt_command, &opt_shell);
+#define SU_OPT_mp (3)
#define SU_OPT_l (4)
if (optind < argc && argv[optind][0] == '-' && argv[optind][1] == 0) {
@@ -89,73 +34,60 @@ int su_main ( int argc, char **argv )
}
/* get user if specified */
- 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 : "" );
+ if (optind < argc) opt_username = argv [optind++];
+
+ if (optind < argc) opt_args = argv + optind;
+
+ if (ENABLE_SU_SYSLOG) {
+ /* The utmp entry (via getlogin) is probably the best way to identify
+ the user, especially if someone su's from a su-shell.
+ But getlogin can fail -- usually due to lack of utmp entry.
+ in this case resort to getpwuid. */
+ old_user = bb_xstrdup(USE_FEATURE_UTMP(getlogin() ? : ) (pw = getpwuid(cur_uid)) ? pw->pw_name : "");
+ tty = ttyname(2) ? : "none";
+ openlog(bb_applet_name, 0, LOG_AUTH);
}
- tty = ttyname ( 2 );
- if(!tty)
- tty = "none";
- openlog ( bb_applet_name, 0, LOG_AUTH );
-#endif
-
- pw = getpwnam ( opt_username );
- if ( !pw )
- bb_error_msg_and_die ( "user %s does not exist", opt_username );
+ pw = getpwnam(opt_username);
+ if (!pw) bb_error_msg_and_die("Unknown id: %s", 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;
+ 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 );
+ if ((cur_uid == 0) || correct_password(pw)) {
+ if (ENABLE_SU_SYSLOG)
+ syslog(LOG_NOTICE, "+ %s %s:%s", tty, old_user, opt_username);
} else {
- log_su_failure (pw->pw_uid, old_user, tty );
- bb_error_msg_and_die ( "incorrect password" );
+ if (ENABLE_SU_SYSLOG)
+ syslog(LOG_NOTICE, "- %s %s:%s", tty, old_user, opt_username);
+ bb_error_msg_and_die("incorrect password");
}
-#if defined( SYSLOG_SUCCESS ) || defined( SYSLOG_FAILURE )
- closelog();
-#endif
+ if (ENABLE_FEATURE_CLEAN_UP && ENABLE_SU_SYSLOG) {
+ closelog();
+ free(old_user);
+ }
- if ( !opt_shell && (flags & SU_OPT_p))
- opt_shell = getenv ( "SHELL" );
+ if (!opt_shell && (flags & SU_OPT_mp)) opt_shell = getenv("SHELL");
- if ( opt_shell && cur_uid && 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
shell. */
- fputs ( "using restricted shell\n", stderr );
+ bb_error_msg("using restricted shell");
opt_shell = 0;
}
- if ( !opt_shell )
- opt_shell = pw->pw_shell;
+ if (!opt_shell) opt_shell = pw->pw_shell;
+
+ change_identity(pw);
+ setup_environment(opt_shell, flags & SU_OPT_l, !(flags & SU_OPT_mp), pw);
+ USE_SELINUX(set_current_security_context(NULL);)
- change_identity ( pw );
- setup_environment(opt_shell, flags & SU_OPT_l, !(flags & SU_OPT_p), pw);
-#if ENABLE_SELINUX
- set_current_security_context(NULL);
-#endif
+ /* Returns only on error */
run_shell(opt_shell, flags & SU_OPT_l, opt_command, (const char**)opt_args);
return EXIT_FAILURE;