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libs/libc/unistd: Stubs for setuid and setgid. Added stubbed implementations of setuid and setgid. These functions are essentially stubs pretending that NuttX supported users and groups and that the only configured user and group in the system were both 'root' with a uid and a gid of 0, respectively. The intent is not to provide meaningful new features, but to ease porting of foreign source code to NuttX.

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This commit is contained in:
Michael Jung 2019-08-06 07:17:23 -06:00 committed by Gregory Nutt
parent a12f80fb90
commit e8af615578
5 changed files with 171 additions and 2 deletions
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4
include/errno.h
View file

@ -45,6 +45,7 @@
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* How can we access the errno variable? */
#if !defined(CONFIG_BUILD_PROTECTED) && !defined(CONFIG_BUILD_KERNEL)
@ -87,7 +88,8 @@
# else
/* User libraries for the kernel. Only indirect access from user
* libraries */
* libraries
*/
# undef __DIRECT_ERRNO_ACCESS
# endif

5
include/unistd.h
View file

@ -368,6 +368,11 @@ int sethostname(FAR const char *name, size_t size);
long sysconf(int name);
/* User and group identity management */
int setuid(uid_t uid);
int setgid(gid_t gid);
#undef EXTERN
#if defined(__cplusplus)
}

2
libs/libc/unistd/Make.defs
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@ -37,7 +37,7 @@
CSRCS += lib_access.c lib_daemon.c lib_swab.c lib_sysconf.c
CSRCS += lib_getopt.c lib_getoptargp.c lib_getoptindp.c lib_getoptoptp.c
CSRCS += lib_sleep.c lib_usleep.c
CSRCS += lib_sleep.c lib_usleep.c lib_setuid.c lib_setgid.c
ifneq ($(CONFIG_DISABLE_ENVIRON),y)
CSRCS += lib_chdir.c lib_getcwd.c

81
libs/libc/unistd/lib_setgid.c Normal file
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@ -0,0 +1,81 @@
/****************************************************************************
* libs/libc/unistd/lib_setgid.c
*
* Copyright (C) 2019 Gregory Nutt. All rights reserved.
* Author: Michael Jung <mijung@gmx.net>
*
* 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 NuttX 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 THE COPYRIGHT HOLDERS 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 THE
* COPYRIGHT OWNER 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <unistd.h>
#include <errno.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: setgid
*
* Description:
* The setgid() function sets the real group ID, effective group ID, and
* the saved set-group-ID of the calling process to gid, given appropriate
* privileges.
*
* Input Parameters:
* uid - User identity to set the various process' user ID attributes to.
*
* Returned Value:
* Zero if successful and -1 in case of failure, in which case errno is set
* appropriately.
*
****************************************************************************/
int setgid(gid_t gid)
{
/* NuttX only supports the group identity 'root' with a gid value of 0. */
if (gid == 0)
{
return 0;
}
/* All other gid values are considered invalid and not supported by the
* implementation.
*/
set_errno(EINVAL);
return -1;
}

81
libs/libc/unistd/lib_setuid.c Normal file
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@ -0,0 +1,81 @@
/****************************************************************************
* libs/libc/unistd/lib_setuid.c
*
* Copyright (C) 2019 Gregory Nutt. All rights reserved.
* Author: Michael Jung <mijung@gmx.net>
*
* 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 NuttX 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 THE COPYRIGHT HOLDERS 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 THE
* COPYRIGHT OWNER 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <unistd.h>
#include <errno.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: setuid
*
* Description:
* The setuid() function sets the real user ID, effective user ID, and the
* saved set-user-ID of the calling process to uid, given appropriate
* privileges.
*
* Input Parameters:
* uid - User identity to set the various process' user ID attributes to.
*
* Returned Value:
* Zero if successful and -1 in case of failure, in which case errno is set
* appropriately.
*
****************************************************************************/
int setuid(uid_t uid)
{
/* NuttX only supports the user identity 'root' with a uid value of 0. */
if (uid == 0)
{
return 0;
}
/* All other uid values are considered invalid and not supported by the
* implementation.
*/
set_errno(EINVAL);
return -1;
}