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libc/libc/unistd/: Add stubs for setreuid(), and setregid(). NuttX does not currently support effective user/group IDs, but these stubs will support linkage of applications that expect these POSIX standard interfaces.

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This commit is contained in:
Gregory Nutt 2019-09-03 11:35:31 -06:00
parent a2bf7057f6
commit 38ada48454
4 changed files with 184 additions and 0 deletions
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3
include/unistd.h
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@ -380,6 +380,9 @@ uid_t geteuid(void);
int setegid(gid_t gid);
gid_t getegid(void);
int setreuid(uid_t ruid, uid_t euid);
int setregid(gid_t rgid, gid_t egid);
#undef EXTERN
#if defined(__cplusplus)
}

1
libs/libc/unistd/Make.defs
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@ -39,6 +39,7 @@ 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_seteuid.c lib_setegid.c lib_geteuid.c lib_getegid.c
CSRCS += lib_setreuid.c lib_setregid.c
ifneq ($(CONFIG_SCHED_USER_IDENTITY),y)
CSRCS += lib_setuid.c lib_setgid.c lib_getuid.c lib_getgid.c

90
libs/libc/unistd/lib_setregid.c Normal file
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@ -0,0 +1,90 @@
/****************************************************************************
* libs/libc/unistd/lib_setregid.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: setregid
*
* Description:
* The setregid() function sets the real group ID and/or the effective group
* ID of the calling task group to rgid and/or egid.
*
* Input Parameters:
* rgid - Real group identity to set. The special value (gid_t)-1
* indicates that the real group ID should not be changed.
* rgid - Effective group identity to set. The special value (gid_t)-1
* indicates that the effective group ID should not be changed.
*
* Returned Value:
* Zero if successful and -1 in case of failure, in which case errno is set
* appropriately.
*
****************************************************************************/
int setregid(gid_t rgid, gid_t egid)
{
int ret = OK;
if (rgid != (gid_t)-1)
{
/* Set the real group ID. CAREFUL: This exploits non-standard behavior
* of setgid(): setgid() should set the real, effective, and saved
* group ID. Here we depend on it setting only the real group ID.
*/
ret = setgid(rgid);
}
if (ret >= 0 && egid != (gid_t)-1)
{
/* Set the effective group ID */
ret = setegid(egid);
}
return ret;
}

90
libs/libc/unistd/lib_setreuid.c Normal file
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@ -0,0 +1,90 @@
/****************************************************************************
* libs/libc/unistd/lib_setreuid.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: setreuid
*
* Description:
* The setreuid() function sets the real user ID and/or the effective user
* ID of the calling task group to ruid and/or euid.
*
* Input Parameters:
* ruid - Real user identity to set. The special value (uid_t)-1
* indicates that the real user ID should not be changed.
* ruid - Effective user identity to set. The special value (uid_t)-1
* indicates that the effective user ID should not be changed.
*
* Returned Value:
* Zero if successful and -1 in case of failure, in which case errno is set
* appropriately.
*
****************************************************************************/
int setreuid(uid_t ruid, uid_t euid)
{
int ret = OK;
if (ruid != (uid_t)-1)
{
/* Set the real user ID. CAREFUL: This exploits non-standard behavior
* of setuid(): setuid() should set the real, effective, and saved
* user ID. Here we depend on it setting only the real user ID.
*/
ret = setuid(ruid);
}
if (ret >= 0 && euid != (uid_t)-1)
{
/* Set the effective user ID */
ret = seteuid(euid);
}
return ret;
}