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716154c592
Updated AUTHORS, COPYING, DISCLAIMER, and INSTALL files. Added standardized headers to all source file to clearly indicate the copyright, license, and to give credit where credit is due.
303 lines
6.3 KiB
C
303 lines
6.3 KiB
C
/*****************************************************************************\
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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* For details, see <http://github.com/behlendorf/spl/>.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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*****************************************************************************
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* Solaris Porting Layer (SPL) Credential Implementation.
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\*****************************************************************************/
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#include <sys/cred.h>
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#ifdef DEBUG_SUBSYSTEM
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#undef DEBUG_SUBSYSTEM
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#endif
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#define DEBUG_SUBSYSTEM S_CRED
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#ifdef HAVE_GROUPS_SEARCH
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/* Symbol may be exported by custom kernel patch */
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#define cr_groups_search(gi, grp) groups_search(gi, grp)
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#else
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/* Implementation from 2.6.30 kernel */
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static int
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cr_groups_search(const struct group_info *group_info, gid_t grp)
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{
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unsigned int left, right;
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if (!group_info)
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return 0;
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left = 0;
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right = group_info->ngroups;
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while (left < right) {
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unsigned int mid = (left+right)/2;
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int cmp = grp - GROUP_AT(group_info, mid);
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if (cmp > 0)
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left = mid + 1;
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else if (cmp < 0)
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right = mid;
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else
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return 1;
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}
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return 0;
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}
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#endif
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#ifdef HAVE_CRED_STRUCT
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/*
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* As of 2.6.29 a clean credential API appears in the linux kernel.
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* We attempt to layer the Solaris API on top of the linux API.
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*/
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/* Hold a reference on the credential and group info */
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void
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crhold(cred_t *cr)
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{
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(void)get_cred((const cred_t *)cr);
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(void)get_group_info(cr->group_info);
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}
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/* Free a reference on the credential and group info */
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void
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crfree(cred_t *cr)
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{
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put_group_info(cr->group_info);
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put_cred((const cred_t *)cr);
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}
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/* Return the effective user id */
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uid_t
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crgetuid(const cred_t *cr)
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{
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return cr->euid;
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}
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/* Return the real user id */
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uid_t
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crgetruid(const cred_t *cr)
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{
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return cr->uid;
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}
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/* Return the saved user id */
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uid_t
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crgetsuid(const cred_t *cr)
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{
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return cr->suid;
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}
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/* Return the effective group id */
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gid_t
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crgetgid(const cred_t *cr)
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{
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return cr->egid;
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}
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/* Return the real group id */
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gid_t
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crgetrgid(const cred_t *cr)
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{
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return cr->gid;
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}
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/* Return the saved group id */
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gid_t
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crgetsgid(const cred_t *cr)
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{
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return cr->sgid;
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}
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/* Return the number of supplemental groups */
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int
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crgetngroups(const cred_t *cr)
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{
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struct group_info *gi;
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int rc;
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gi = get_group_info(cr->group_info);
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rc = gi->ngroups;
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put_group_info(gi);
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return rc;
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}
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/*
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* Return an array of supplemental gids. The returned address is safe
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* to use as long as the caller has taken a reference with crhold().
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* The caller is responsible for releasing the reference with crfree().
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*/
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gid_t *
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crgetgroups(const cred_t *cr)
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{
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struct group_info *gi;
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gid_t *gids;
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gi = get_group_info(cr->group_info);
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gids = gi->blocks[0];
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put_group_info(gi);
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return gids;
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}
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/* Check if the passed gid is available is in supplied credential. */
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int
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groupmember(gid_t gid, const cred_t *cr)
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{
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struct group_info *gi;
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int rc;
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gi = get_group_info(cr->group_info);
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rc = cr_groups_search(cr->group_info, gid);
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put_group_info(gi);
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return rc;
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}
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#else /* HAVE_CRED_STRUCT */
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/*
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* Until very recently all credential information was embedded in
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* the linux task struct. For this reason to simulate a Solaris
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* cred_t we need to pass the entire task structure around.
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*/
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/* Hold a reference on the credential and group info */
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void crhold(cred_t *cr) { }
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/* Free a reference on the credential and group info */
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void crfree(cred_t *cr) { }
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/* Return the effective user id */
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uid_t
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crgetuid(const cred_t *cr) {
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return cr->euid;
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}
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/* Return the effective real id */
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uid_t
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crgetruid(const cred_t *cr) {
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return cr->uid;
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}
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/* Return the effective saved id */
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uid_t
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crgetsuid(const cred_t *cr) {
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return cr->suid;
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}
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/* Return the effective group id */
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gid_t
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crgetgid(const cred_t *cr) {
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return cr->egid;
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}
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/* Return the real group id */
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gid_t
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crgetrgid(const cred_t *cr) {
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return cr->gid;
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}
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/* Return the saved group id */
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gid_t
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crgetsgid(const cred_t *cr) {
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return cr->sgid;
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}
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/* Return the number of supplemental groups */
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int
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crgetngroups(const cred_t *cr)
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{
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int lock, rc;
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lock = (cr != current);
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if (lock)
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task_lock((struct task_struct *)cr);
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get_group_info(cr->group_info);
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rc = cr->group_info->ngroups;
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put_group_info(cr->group_info);
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if (lock)
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task_unlock((struct task_struct *)cr);
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return rc;
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}
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/*
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* Return an array of supplemental gids. The returned address is safe
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* to use as long as the caller has taken a reference with crhold().
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* The caller is responsible for releasing the reference with crfree().
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*/
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gid_t *
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crgetgroups(const cred_t *cr)
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{
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gid_t *gids;
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int lock;
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lock = (cr != current);
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if (lock)
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task_lock((struct task_struct *)cr);
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get_group_info(cr->group_info);
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gids = cr->group_info->blocks[0];
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put_group_info(cr->group_info);
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if (lock)
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task_unlock((struct task_struct *)cr);
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return gids;
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}
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/* Check if the passed gid is available is in supplied credential. */
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int
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groupmember(gid_t gid, const cred_t *cr)
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{
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int lock, rc;
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lock = (cr != current);
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if (lock)
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task_lock((struct task_struct *)cr);
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get_group_info(cr->group_info);
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rc = cr_groups_search(cr->group_info, gid);
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put_group_info(cr->group_info);
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if (lock)
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task_unlock((struct task_struct *)cr);
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return rc;
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}
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#endif /* HAVE_CRED_STRUCT */
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EXPORT_SYMBOL(crhold);
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EXPORT_SYMBOL(crfree);
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EXPORT_SYMBOL(crgetuid);
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EXPORT_SYMBOL(crgetruid);
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EXPORT_SYMBOL(crgetsuid);
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EXPORT_SYMBOL(crgetgid);
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EXPORT_SYMBOL(crgetrgid);
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EXPORT_SYMBOL(crgetsgid);
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EXPORT_SYMBOL(crgetngroups);
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EXPORT_SYMBOL(crgetgroups);
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EXPORT_SYMBOL(groupmember);
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