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su: move restricted_shell into su.c (the only user)

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function                                             old     new   delta
su_main                                              448     468     +20
buffer_fill_and_print                                179     196     +17
scriptreplay_main                                    205     208      +3
localcmd                                             275     277      +2
hash_find                                            233     234      +1
devmem_main                                          469     463      -6
install_main                                         724     716      -8
setusershell                                          11       -     -11
find_pair                                            187     169     -18
restricted_shell                                      49       -     -49
------------------------------------------------------------------------------
(add/remove: 0/3 grow/shrink: 5/3 up/down: 43/-92)            Total: -49 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-02-26 10:01:18 +01:00
parent fd686a262f
commit 26ffe81188
4 changed files with 18 additions and 49 deletions
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1
include/libbb.h
View File

@ -1139,7 +1139,6 @@ extern void selinux_preserve_fcontext(int fdesc) FAST_FUNC;
#define selinux_preserve_fcontext(fdesc) ((void)0)
#endif
extern void selinux_or_die(void) FAST_FUNC;
extern int restricted_shell(const char *shell) FAST_FUNC;
/* setup_environment:
* if chdir pw->pw_dir: ok: else if to_tmp == 1: goto /tmp else: goto / or die

1
libbb/Kbuild
View File

@ -84,7 +84,6 @@ lib-y += read.o
lib-y += read_key.o
lib-y += recursive_action.o
lib-y += remove_file.o
lib-y += restricted_shell.o
lib-y += run_shell.o
lib-y += safe_gethostname.o
lib-y += safe_poll.o

46
libbb/restricted_shell.c
View File

@ -1,46 +0,0 @@
/* vi: set sw=4 ts=4: */
/*
* Copyright 1989 - 1991, Julianne Frances Haugh <jockgrrl@austin.rr.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "libbb.h"
/* Return 1 if SHELL is a restricted shell (one not returned by
getusershell), else 0, meaning it is a standard shell. */
int FAST_FUNC restricted_shell(const char *shell)
{
char *line;
setusershell();
while ((line = getusershell())) {
if (*line != '#' && strcmp(line, shell) == 0)
return 0;
}
endusershell();
return 1;
}

19
loginutils/su.c
View File

@ -8,6 +8,23 @@
#include "libbb.h"
#include <syslog.h>
#if ENABLE_FEATURE_SU_CHECKS_SHELLS
/* Return 1 if SHELL is a restricted shell (one not returned by
getusershell), else 0, meaning it is a standard shell. */
static int restricted_shell(const char *shell)
{
char *line;
/*setusershell(); - getusershell does it itself*/
while ((line = getusershell()) != NULL) {
if (/* *line != '#' && */ strcmp(line, shell) == 0)
return 0;
}
endusershell();
return 1;
}
#endif
#define SU_OPT_mp (3)
#define SU_OPT_l (4)
@ -89,7 +106,7 @@ int su_main(int argc UNUSED_PARAM, char **argv)
opt_shell = getenv("SHELL");
#if ENABLE_FEATURE_SU_CHECKS_SHELLS
if (opt_shell && cur_uid && restricted_shell(pw->pw_shell)) {
if (opt_shell && cur_uid != 0 && 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