Patch from Tito to make syslog configurable and remove #ifdefs. Further

cleanups by me.

1 files changed, 43 insertions, 111 deletions

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;