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2006-04-26 James Antill <james.antill@redhat.com>

Browse Source 
Ulrich Drepper  <drepper@redhat.com>

	* config.make.in: Add have-libcap.
	* configure.in: Check for libcap.
	* nscd/Makefile (selinux-LIBS): Add -lcap if possible.
	* nscd/connections.c (finish_drop_privileges): When libcap is available
	call preserve_capabilities and install_real_capabilities.
	* nscd/selinux.c: Define preserve_capabilities and
	install_real_capabilities.
	* nscd/selinux.h: Declare preserve_capabilities and
	install_real_capabilities.
This commit is contained in:
Ulrich Drepper 2006-04-26 16:29:29 +00:00
parent cf86bbe6da
commit 1f063dcadb
8 changed files with 214 additions and 4 deletions
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13
ChangeLog
View File

@ -1,3 +1,16 @@
2006-04-26 James Antill <james.antill@redhat.com>
Ulrich Drepper <drepper@redhat.com>
* config.make.in: Add have-libcap.
* configure.in: Check for libcap.
* nscd/Makefile (selinux-LIBS): Add -lcap if possible.
* nscd/connections.c (finish_drop_privileges): When libcap is available
call preserve_capabilities and install_real_capabilities.
* nscd/selinux.c: Define preserve_capabilities and
install_real_capabilities.
* nscd/selinux.h: Declare preserve_capabilities and
install_real_capabilities.
2006-04-26 Ulrich Drepper <drepper@redhat.com>
* locale/iso-4217.def: Update.

1
config.make.in
View File

@ -61,6 +61,7 @@ have-fpie = @libc_cv_fpie@
have-ssp = @libc_cv_ssp@
have-selinux = @have_selinux@
have-libaudit = @have_libaudit@
have-libcap = @have_libcap@
have-cc-with-libunwind = @libc_cv_cc_with_libunwind@
fno-unit-at-a-time = @fno_unit_at_a_time@
bind-now = @bindnow@

83
configure vendored
View File

@ -313,7 +313,7 @@ ac_includes_default="\
# include <unistd.h>
#endif"
ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS with_fp with_cvs enable_check_abi oldest_abi bindnow force_install all_warnings build build_cpu build_vendor build_os host host_cpu host_vendor host_os subdirs add_ons add_on_subdirs base_machine submachine sysnames sysdeps_add_ons INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA LN_S CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC OBJEXT BUILD_CC cross_compiling CPP CXX CXXFLAGS ac_ct_CXX AR OBJDUMP RANLIB ac_ct_RANLIB MIG AS LD PWD_P MAKE MSGFMT MAKEINFO SED AUTOCONF SYSINCLUDES CXX_SYSINCLUDES libc_cv_gcc_static_libgcc BASH libc_cv_have_bash2 KSH libc_cv_have_ksh AWK PERL INSTALL_INFO BISON VERSIONING libc_cv_asm_protected_directive libc_cv_cc_with_libunwind libc_cv_z_nodelete libc_cv_z_nodlopen libc_cv_z_initfirst libc_cv_z_relro libc_cv_Bgroup libc_cv_libgcc_s_suffix libc_cv_as_needed ASFLAGS_config libc_cv_z_combreloc libc_cv_z_execstack libc_cv_fpie fno_unit_at_a_time libc_cv_ssp libc_cv_have_initfini no_whole_archive exceptions LIBGD have_libaudit have_selinux EGREP sizeof_long_double libc_cv_gcc_unwind_find_fde uname_sysname uname_release uname_version old_glibc_headers libc_cv_slibdir libc_cv_localedir libc_cv_sysconfdir libc_cv_rootsbindir libc_cv_forced_unwind use_ldconfig ldd_rewrite_script elf xcoff static shared pic_default profile omitfp bounded static_nss nopic_initfini DEFINES mach_interface_list VERSION RELEASE LIBOBJS LTLIBOBJS'
ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS with_fp with_cvs enable_check_abi oldest_abi bindnow force_install all_warnings build build_cpu build_vendor build_os host host_cpu host_vendor host_os subdirs add_ons add_on_subdirs base_machine submachine sysnames sysdeps_add_ons INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA LN_S CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC OBJEXT BUILD_CC cross_compiling CPP CXX CXXFLAGS ac_ct_CXX AR OBJDUMP RANLIB ac_ct_RANLIB MIG AS LD PWD_P MAKE MSGFMT MAKEINFO SED AUTOCONF SYSINCLUDES CXX_SYSINCLUDES libc_cv_gcc_static_libgcc BASH libc_cv_have_bash2 KSH libc_cv_have_ksh AWK PERL INSTALL_INFO BISON VERSIONING libc_cv_asm_protected_directive libc_cv_cc_with_libunwind libc_cv_z_nodelete libc_cv_z_nodlopen libc_cv_z_initfirst libc_cv_z_relro libc_cv_Bgroup libc_cv_libgcc_s_suffix libc_cv_as_needed ASFLAGS_config libc_cv_z_combreloc libc_cv_z_execstack libc_cv_fpie fno_unit_at_a_time libc_cv_ssp libc_cv_have_initfini no_whole_archive exceptions LIBGD have_libaudit have_libcap have_selinux EGREP sizeof_long_double libc_cv_gcc_unwind_find_fde uname_sysname uname_release uname_version old_glibc_headers libc_cv_slibdir libc_cv_localedir libc_cv_sysconfdir libc_cv_rootsbindir libc_cv_forced_unwind use_ldconfig ldd_rewrite_script elf xcoff static shared pic_default profile omitfp bounded static_nss nopic_initfini DEFINES mach_interface_list VERSION RELEASE LIBOBJS LTLIBOBJS'
ac_subst_files=''
# Initialize some variables set by options.
@ -6831,6 +6831,86 @@ _ACEOF
fi
# See if we have the libcap library
echo "$as_me:$LINENO: checking for cap_init in -lcap" >&5
echo $ECHO_N "checking for cap_init in -lcap... $ECHO_C" >&6
if test "${ac_cv_lib_cap_cap_init+set}" = set; then
echo $ECHO_N "(cached) $ECHO_C" >&6
else
ac_check_lib_save_LIBS=$LIBS
LIBS="-lcap $LIBS"
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
/* Override any gcc2 internal prototype to avoid an error. */
#ifdef __cplusplus
extern "C"
#endif
/* We use char because int might match the return type of a gcc2
builtin and then its argument prototype would still apply. */
char cap_init ();
int
main ()
{
cap_init ();
;
return 0;
}
_ACEOF
rm -f conftest.$ac_objext conftest$ac_exeext
if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
(eval $ac_link) 2>conftest.er1
ac_status=$?
grep -v '^ *+' conftest.er1 >conftest.err
rm -f conftest.er1
cat conftest.err >&5
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); } &&
{ ac_try='test -z "$ac_c_werror_flag"
|| test ! -s conftest.err'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; } &&
{ ac_try='test -s conftest$ac_exeext'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; }; then
ac_cv_lib_cap_cap_init=yes
else
echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
ac_cv_lib_cap_cap_init=no
fi
rm -f conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
LIBS=$ac_check_lib_save_LIBS
fi
echo "$as_me:$LINENO: result: $ac_cv_lib_cap_cap_init" >&5
echo "${ECHO_T}$ac_cv_lib_cap_cap_init" >&6
if test $ac_cv_lib_cap_cap_init = yes; then
have_libcap=yes
else
have_libcap=no
fi
if test "x$have_libcap" = xyes; then
cat >>confdefs.h <<\_ACEOF
#define HAVE_LIBCAP 1
_ACEOF
fi
fi
@ -8423,6 +8503,7 @@ s,@no_whole_archive@,$no_whole_archive,;t t
s,@exceptions@,$exceptions,;t t
s,@LIBGD@,$LIBGD,;t t
s,@have_libaudit@,$have_libaudit,;t t
s,@have_libcap@,$have_libcap,;t t
s,@have_selinux@,$have_selinux,;t t
s,@EGREP@,$EGREP,;t t
s,@sizeof_long_double@,$sizeof_long_double,;t t

7
configure.in
View File

@ -1982,6 +1982,13 @@ if test "x$have_selinux" = xyes; then
AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
fi
AC_SUBST(have_libaudit)
# See if we have the libcap library
AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
if test "x$have_libcap" = xyes; then
AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
fi
AC_SUBST(have_libcap)
fi
AC_SUBST(have_selinux)

5
nscd/Makefile
View File

@ -55,10 +55,13 @@ all-nscd-modules := $(nscd-modules) selinux
ifeq (yes,$(have-selinux))
ifeq (yes,$(have-libaudit))
libaudit = -laudit
ifeq (yes,$(have-libcap))
libcap = -lcap
endif
endif
nscd-modules += selinux
selinux-LIBS := -lselinux $(libaudit)
selinux-LIBS := -lselinux $(libaudit) $(libcap)
# The configure.in check for libselinux and its headers did not use
# $SYSINCLUDES. The directory specified by --with-headers usually

10
nscd/connections.c
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@ -1859,6 +1859,11 @@ begin_drop_privileges (void)
static void
finish_drop_privileges (void)
{
#if defined HAVE_LIBAUDIT && defined HAVE_LIBCAP
/* We need to preserve the capabilities to connect to the audit daemon. */
cap_t new_caps = preserve_capabilities ();
#endif
if (setgroups (server_ngroups, server_groups) == -1)
{
dbg_log (_("Failed to run nscd as user '%s'"), server_user);
@ -1878,4 +1883,9 @@ finish_drop_privileges (void)
perror ("setuid");
exit (4);
}
#if defined HAVE_LIBAUDIT && defined HAVE_LIBCAP
/* Remove the temporary capabilities. */
install_real_capabilities (new_caps);
#endif
}

87
nscd/selinux.c
View File

@ -28,12 +28,13 @@
#include <stdlib.h>
#include <syslog.h>
#include <unistd.h>
#include <sys/prctl.h>
#include <selinux/av_permissions.h>
#include <selinux/avc.h>
#include <selinux/flask.h>
#include <selinux/selinux.h>
#ifdef HAVE_LIBAUDIT
#include <libaudit.h>
# include <libaudit.h>
#endif
#include "dbg_log.h"
@ -149,6 +150,90 @@ audit_init (void)
&& errno != EINVAL && errno != EPROTONOSUPPORT && errno != EAFNOSUPPORT)
dbg_log (_("Failed opening connection to the audit subsystem: %m"));
}
# ifdef HAVE_LIBCAP
static const cap_value_t new_cap_list[] =
{ CAP_AUDIT_WRITE };
# define nnew_cap_list (sizeof (new_cap_list) / sizeof (new_cap_list[0]))
static const cap_value_t tmp_cap_list[] =
{ CAP_AUDIT_WRITE, CAP_SETUID, CAP_SETGID };
# define ntmp_cap_list (sizeof (tmp_cap_list) / sizeof (tmp_cap_list[0]))
cap_t
preserve_capabilities (void)
{
if (getuid () != 0)
/* Not root, then we cannot preserve anything. */
return NULL;
if (prctl (PR_SET_KEEPCAPS, 1) == -1)
{
dbg_log (_("Failed to set keep-capabilities"));
error (EXIT_FAILURE, errno, _("prctl(KEEPCAPS) failed"));
/* NOTREACHED */
}
cap_t tmp_caps = cap_init ();
cap_t new_caps;
if (tmp_caps != NULL)
new_caps = cap_init ();
if (tmp_caps == NULL || new_caps == NULL)
{
if (tmp_caps != NULL)
free_caps (tmp_caps);
dbg_log (_("Failed to initialize drop of capabilities"));
error (EXIT_FAILURE, 0, _("cap_init failed"));
}
/* There is no reason why these should not work. */
cap_set_flag (new_caps, CAP_PERMITTED, nnew_cap_list, new_cap_list, CAP_SET);
cap_set_flag (new_caps, CAP_EFFECTIVE, nnew_cap_list, new_cap_list, CAP_SET);
cap_set_flag (tmp_caps, CAP_PERMITTED, ntmp_cap_list, tmp_cap_list, CAP_SET);
cap_set_flag (tmp_caps, CAP_EFFECTIVE, ntmp_cap_list, tmp_cap_list, CAP_SET);
int res = cap_set_proc (tmp_caps);
cap_free (tmp_caps);
if (__builtin_expect (res != 0, 0))
{
cap_free (new_caps);
dbg_log (_("Failed to drop capabilities\n"));
error (EXIT_FAILURE, 0, _("cap_set_proc failed"));
}
return new_caps;
}
void
install_real_capabilities (cap_t new_caps)
{
/* If we have no capabilities there is nothing to do here. */
if (new_caps == NULL)
return;
if (cap_set_proc (new_caps))
{
cap_free (new_caps);
dbg_log (_("Failed to drop capabilities"));
error (EXIT_FAILURE, 0, _("cap_set_proc failed"));
/* NOTREACHED */
}
cap_free (new_caps);
if (prctl (PR_SET_KEEPCAPS, 0) == -1)
{
dbg_log (_("Failed to unset keep-capabilities"));
error (EXIT_FAILURE, errno, _("prctl(KEEPCAPS) failed"));
/* NOTREACHED */
}
}
# endif /* HAVE_LIBCAP */
#endif /* HAVE_LIBAUDIT */
/* Determine if we are running on an SELinux kernel. Set selinux_enabled

12
nscd/selinux.h
View File

@ -1,5 +1,5 @@
/* Header for nscd SELinux access controls.
Copyright (C) 2004 Free Software Foundation, Inc.
Copyright (C) 2004, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Matthew Rickard <mjricka@epoch.ncsc.mil>, 2004.
@ -22,6 +22,9 @@
#define _SELINUX_H 1
#include "nscd.h"
#ifdef HAVE_LIBCAP
# include <sys/capabilities.h>
#endif
#ifdef HAVE_SELINUX
/* Global variable to tell if the kernel has SELinux support. */
@ -42,6 +45,13 @@ extern int nscd_request_avc_has_perm (int fd, request_type req);
extern void nscd_avc_cache_stats (struct avc_cache_stats *cstats);
/* Display statistics on AVC usage. */
extern void nscd_avc_print_stats (struct avc_cache_stats *cstats);
# ifdef HAVE_LIBCAP
/* Preserve capabilities to connect to connnect to the audit daemon. */
extern cap_t preserve_capabilities (void);
/* Install final capabilities. */
extern void install_real_capabilities (cap_t new_caps);
# endif
#else
# define selinux_enabled 0
# define nscd_avc_init() (void) 0