ce87c49167
* add puffs_cid_isequal() which can be used to test if the two caller id's refer to the same process/lwp.
304 lines
6.8 KiB
C
304 lines
6.8 KiB
C
/* $NetBSD: creds.c,v 1.13 2007/10/18 13:48:04 pooka Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2006 Antti Kantee. All Rights Reserved.
|
|
*
|
|
* Development of this software was supported by the Ulla Tuominen Foundation.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <sys/cdefs.h>
|
|
#if !defined(lint)
|
|
__RCSID("$NetBSD: creds.c,v 1.13 2007/10/18 13:48:04 pooka Exp $");
|
|
#endif /* !lint */
|
|
|
|
/*
|
|
* Interface for dealing with credits.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/param.h>
|
|
|
|
#include <errno.h>
|
|
#include <puffs.h>
|
|
#include <stdbool.h>
|
|
#include <string.h>
|
|
|
|
#include "puffs_priv.h"
|
|
|
|
#define UUCCRED(a) (a->pkcr_type == PUFFCRED_TYPE_UUC)
|
|
#define INTCRED(a) (a->pkcr_type == PUFFCRED_TYPE_INTERNAL)
|
|
|
|
int
|
|
puffs_cred_getuid(const struct puffs_cred *pcr, uid_t *ruid)
|
|
{
|
|
PUFFS_MAKEKCRED(pkcr, pcr);
|
|
|
|
if (!UUCCRED(pkcr)) {
|
|
errno = EOPNOTSUPP;
|
|
return -1;
|
|
}
|
|
*ruid = pkcr->pkcr_uuc.cr_uid;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
puffs_cred_getgid(const struct puffs_cred *pcr, gid_t *rgid)
|
|
{
|
|
PUFFS_MAKEKCRED(pkcr, pcr);
|
|
|
|
if (!UUCCRED(pkcr)) {
|
|
errno = EOPNOTSUPP;
|
|
return -1;
|
|
}
|
|
*rgid = pkcr->pkcr_uuc.cr_gid;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
puffs_cred_getgroups(const struct puffs_cred *pcr, gid_t *rgids, short *ngids)
|
|
{
|
|
PUFFS_MAKEKCRED(pkcr, pcr);
|
|
size_t ncopy;
|
|
|
|
if (!UUCCRED(pkcr)) {
|
|
errno = EOPNOTSUPP;
|
|
return -1;
|
|
}
|
|
|
|
ncopy = MIN(*ngids, NGROUPS);
|
|
(void)memcpy(rgids, pkcr->pkcr_uuc.cr_groups, sizeof(gid_t) * ncopy);
|
|
*ngids = (short)ncopy;
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool
|
|
puffs_cred_isuid(const struct puffs_cred *pcr, uid_t uid)
|
|
{
|
|
PUFFS_MAKEKCRED(pkcr, pcr);
|
|
|
|
return UUCCRED(pkcr) && pkcr->pkcr_uuc.cr_uid == uid;
|
|
}
|
|
|
|
bool
|
|
puffs_cred_hasgroup(const struct puffs_cred *pcr, gid_t gid)
|
|
{
|
|
PUFFS_MAKEKCRED(pkcr, pcr);
|
|
short i;
|
|
|
|
if (!UUCCRED(pkcr))
|
|
return false;
|
|
|
|
if (pkcr->pkcr_uuc.cr_gid == gid)
|
|
return true;
|
|
for (i = 0; i < pkcr->pkcr_uuc.cr_ngroups; i++)
|
|
if (pkcr->pkcr_uuc.cr_groups[i] == gid)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
puffs_cred_isregular(const struct puffs_cred *pcr)
|
|
{
|
|
PUFFS_MAKEKCRED(pkcr, pcr);
|
|
|
|
return UUCCRED(pkcr);
|
|
}
|
|
|
|
bool
|
|
puffs_cred_iskernel(const struct puffs_cred *pcr)
|
|
{
|
|
PUFFS_MAKEKCRED(pkcr, pcr);
|
|
|
|
return INTCRED(pkcr) && pkcr->pkcr_internal == PUFFCRED_CRED_NOCRED;
|
|
}
|
|
|
|
bool
|
|
puffs_cred_isfs(const struct puffs_cred *pcr)
|
|
{
|
|
PUFFS_MAKEKCRED(pkcr, pcr);
|
|
|
|
return INTCRED(pkcr) && pkcr->pkcr_internal == PUFFCRED_CRED_FSCRED;
|
|
}
|
|
|
|
bool
|
|
puffs_cred_isjuggernaut(const struct puffs_cred *pcr)
|
|
{
|
|
|
|
return puffs_cred_isuid(pcr, 0) || puffs_cred_iskernel(pcr)
|
|
|| puffs_cred_isfs(pcr);
|
|
}
|
|
|
|
int
|
|
puffs_cid_getpid(const struct puffs_cid *pcid, pid_t *pid)
|
|
{
|
|
PUFFS_MAKEKCID(pkcid, pcid);
|
|
|
|
if (pkcid->pkcid_type == PUFFCID_TYPE_REAL) {
|
|
*pid = pkcid->pkcid_pid;
|
|
return 0;
|
|
} else {
|
|
errno = ESRCH;
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
int
|
|
puffs_cid_getlwpid(const struct puffs_cid *pcid, lwpid_t *lid)
|
|
{
|
|
PUFFS_MAKEKCID(pkcid, pcid);
|
|
|
|
if (pkcid->pkcid_type == PUFFCID_TYPE_REAL) {
|
|
*lid = pkcid->pkcid_lwpid;
|
|
return 0;
|
|
} else {
|
|
errno = ESRCH;
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
bool
|
|
puffs_cid_isequal(const struct puffs_cid *pc1, const struct puffs_cid *pc2)
|
|
{
|
|
PUFFS_MAKEKCID(pkc1, pc1);
|
|
PUFFS_MAKEKCID(pkc2, pc2);
|
|
|
|
if (pkc1->pkcid_type != PUFFCID_TYPE_REAL
|
|
|| pkc2->pkcid_type != PUFFCID_TYPE_REAL)
|
|
return false;
|
|
|
|
if (pkc1->pkcid_lwpid == pkc1->pkcid_lwpid
|
|
&& pkc2->pkcid_pid == pkc2->pkcid_pid)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Generic routine for checking file access rights. Modeled after
|
|
* vaccess() in the kernel.
|
|
*/
|
|
int
|
|
puffs_access(enum vtype type, mode_t file_mode, uid_t uid, gid_t gid,
|
|
mode_t acc_mode, const struct puffs_cred *pcr)
|
|
{
|
|
mode_t mask;
|
|
|
|
/* megapower */
|
|
if (puffs_cred_iskernel(pcr) || puffs_cred_isfs(pcr))
|
|
return 0;
|
|
|
|
/* superuser, allow all except exec if *ALL* exec bits are unset */
|
|
if (puffs_cred_isuid(pcr, 0)) {
|
|
if ((acc_mode & PUFFS_VEXEC) && type != VDIR &&
|
|
(file_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0)
|
|
return EACCES;
|
|
return 0;
|
|
}
|
|
|
|
mask = 0;
|
|
/* owner */
|
|
if (puffs_cred_isuid(pcr, uid)) {
|
|
if (acc_mode & PUFFS_VEXEC)
|
|
mask |= S_IXUSR;
|
|
if (acc_mode & PUFFS_VREAD)
|
|
mask |= S_IRUSR;
|
|
if (acc_mode & PUFFS_VWRITE)
|
|
mask |= S_IWUSR;
|
|
/* group */
|
|
} else if (puffs_cred_hasgroup(pcr, gid)) {
|
|
if (acc_mode & PUFFS_VEXEC)
|
|
mask |= S_IXGRP;
|
|
if (acc_mode & PUFFS_VREAD)
|
|
mask |= S_IRGRP;
|
|
if (acc_mode & PUFFS_VWRITE)
|
|
mask |= S_IWGRP;
|
|
/* other */
|
|
} else {
|
|
if (acc_mode & PUFFS_VEXEC)
|
|
mask |= S_IXOTH;
|
|
if (acc_mode & PUFFS_VREAD)
|
|
mask |= S_IROTH;
|
|
if (acc_mode & PUFFS_VWRITE)
|
|
mask |= S_IWOTH;
|
|
}
|
|
|
|
if ((file_mode & mask) == mask)
|
|
return 0;
|
|
else
|
|
return EACCES;
|
|
}
|
|
|
|
int
|
|
puffs_access_chown(uid_t owner, gid_t group, uid_t newowner, gid_t newgroup,
|
|
const struct puffs_cred *pcr)
|
|
{
|
|
|
|
if (newowner == (uid_t)PUFFS_VNOVAL)
|
|
newowner = owner;
|
|
if (newgroup == (gid_t)PUFFS_VNOVAL)
|
|
newgroup = group;
|
|
|
|
if ((!puffs_cred_isuid(pcr, owner) || newowner != owner ||
|
|
((newgroup != group && !puffs_cred_hasgroup(pcr, newgroup))))
|
|
&& !puffs_cred_isjuggernaut(pcr))
|
|
return EPERM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
puffs_access_chmod(uid_t owner, gid_t group, enum vtype type, mode_t mode,
|
|
const struct puffs_cred *pcr)
|
|
{
|
|
|
|
if (!puffs_cred_isuid(pcr, owner) && !puffs_cred_isjuggernaut(pcr))
|
|
return EPERM;
|
|
|
|
if (!puffs_cred_isjuggernaut(pcr)) {
|
|
if (type != VDIR && (mode & S_ISTXT))
|
|
return EFTYPE;
|
|
if (!puffs_cred_hasgroup(pcr, group) && (mode & S_ISGID))
|
|
return EPERM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
puffs_access_times(uid_t uid, gid_t gid, mode_t mode, int va_utimes_null,
|
|
const struct puffs_cred *pcr)
|
|
{
|
|
|
|
if (!puffs_cred_isuid(pcr, uid) && !puffs_cred_isjuggernaut(pcr)
|
|
&& (va_utimes_null == 0
|
|
|| puffs_access(VNON, mode, uid, gid, PUFFS_VWRITE, pcr) != 0))
|
|
return EPERM;
|
|
|
|
return 0;
|
|
}
|