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/*
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
* Copyright (C) 2007 The Regents of the University of California.
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
* UCRL-CODE-235197
*
* This file is part of the SPL, Solaris Porting Layer.
*
* The SPL is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* The SPL is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
*
* Solaris Porting Layer (SPL) Credential Implementation.
*/
#include <sys/cred.h>
static int
cr_groups_search(const struct group_info *group_info, kgid_t grp)
{
unsigned int left, right, mid;
int cmp;
if (!group_info)
return (0);
left = 0;
right = group_info->ngroups;
while (left < right) {
mid = (left + right) / 2;
cmp = KGID_TO_SGID(grp) -
KGID_TO_SGID(GROUP_AT(group_info, mid));
if (cmp > 0)
left = mid + 1;
else if (cmp < 0)
right = mid;
else
return (1);
}
return (0);
}
/* Hold a reference on the credential */
void
crhold(cred_t *cr)
{
(void) get_cred((const cred_t *)cr);
}
/* Free a reference on the credential */
void
crfree(cred_t *cr)
{
put_cred((const cred_t *)cr);
}
/* Return the number of supplemental groups */
int
crgetngroups(const cred_t *cr)
{
struct group_info *gi;
int rc;
gi = cr->group_info;
rc = gi->ngroups;
#ifndef HAVE_GROUP_INFO_GID
/*
* For Linux <= 4.8,
* crgetgroups will only returns gi->blocks[0], which contains only
* the first NGROUPS_PER_BLOCK groups.
*/
if (rc > NGROUPS_PER_BLOCK) {
WARN_ON_ONCE(1);
rc = NGROUPS_PER_BLOCK;
}
#endif
return (rc);
}
/*
* Return an array of supplemental gids. The returned address is safe
* to use as long as the caller has taken a reference with crhold().
*
* Linux 4.9 API change, group_info changed from 2d array via ->blocks to 1d
* array via ->gid.
*/
gid_t *
crgetgroups(const cred_t *cr)
{
struct group_info *gi;
gid_t *gids = NULL;
gi = cr->group_info;
#ifdef HAVE_GROUP_INFO_GID
gids = KGIDP_TO_SGIDP(gi->gid);
#else
if (gi->nblocks > 0)
gids = KGIDP_TO_SGIDP(gi->blocks[0]);
#endif
return (gids);
}
/* Check if the passed gid is available in supplied credential. */
int
groupmember(gid_t gid, const cred_t *cr)
{
struct group_info *gi;
int rc;
gi = cr->group_info;
rc = cr_groups_search(gi, SGID_TO_KGID(gid));
return (rc);
}
/* Return the effective user id */
uid_t
crgetuid(const cred_t *cr)
{
return (KUID_TO_SUID(cr->fsuid));
}
/* Return the real user id */
uid_t
crgetruid(const cred_t *cr)
{
return (KUID_TO_SUID(cr->uid));
}
/* Return the effective group id */
gid_t
crgetgid(const cred_t *cr)
{
return (KGID_TO_SGID(cr->fsgid));
}
EXPORT_SYMBOL(crhold);
EXPORT_SYMBOL(crfree);
EXPORT_SYMBOL(crgetuid);
EXPORT_SYMBOL(crgetruid);
EXPORT_SYMBOL(crgetgid);
EXPORT_SYMBOL(crgetngroups);
EXPORT_SYMBOL(crgetgroups);
EXPORT_SYMBOL(groupmember);
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