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/*
* Copyright (c) 2005, PADL Software Pty Ltd.
* All rights reserved.
*
* Portions Copyright (c) 2009 Apple Inc. All rights reserved.
*
* 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 of PADL Software 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 PADL SOFTWARE 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 PADL SOFTWARE 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 "kcm_locl.h"
krb5_error_code
kcm_access(krb5_context context,
kcm_client *client,
kcm_operation opcode,
kcm_ccache ccache)
{
int read_p = 0;
int write_p = 0;
uint16_t mask;
krb5_error_code ret;
KCM_ASSERT_VALID(ccache);
switch (opcode) {
case KCM_OP_INITIALIZE:
case KCM_OP_DESTROY:
case KCM_OP_STORE:
case KCM_OP_REMOVE_CRED:
case KCM_OP_SET_FLAGS:
case KCM_OP_CHOWN:
case KCM_OP_CHMOD:
case KCM_OP_GET_INITIAL_TICKET:
case KCM_OP_GET_TICKET:
case KCM_OP_MOVE_CACHE:
case KCM_OP_SET_DEFAULT_CACHE:
case KCM_OP_SET_KDC_OFFSET:
write_p = 1;
read_p = 0;
break;
case KCM_OP_NOOP:
case KCM_OP_GET_NAME:
case KCM_OP_RESOLVE:
case KCM_OP_GEN_NEW:
case KCM_OP_RETRIEVE:
case KCM_OP_GET_PRINCIPAL:
case KCM_OP_GET_CRED_UUID_LIST:
case KCM_OP_GET_CRED_BY_UUID:
case KCM_OP_GET_CACHE_UUID_LIST:
case KCM_OP_GET_CACHE_BY_UUID:
case KCM_OP_GET_DEFAULT_CACHE:
case KCM_OP_GET_KDC_OFFSET:
write_p = 0;
read_p = 1;
break;
default:
ret = KRB5_FCC_PERM;
goto out;
}
if (ccache->flags & KCM_FLAGS_OWNER_IS_SYSTEM) {
/* System caches cannot be reinitialized or destroyed by users */
if (opcode == KCM_OP_INITIALIZE ||
opcode == KCM_OP_DESTROY ||
opcode == KCM_OP_REMOVE_CRED ||
opcode == KCM_OP_MOVE_CACHE) {
ret = KRB5_FCC_PERM;
goto out;
}
/* Let root always read system caches */
if (CLIENT_IS_ROOT(client)) {
ret = 0;
goto out;
}
}
/* start out with "other" mask */
mask = S_IROTH|S_IWOTH;
/* root can do anything */
if (CLIENT_IS_ROOT(client)) {
if (read_p)
mask |= S_IRUSR|S_IRGRP|S_IROTH;
if (write_p)
mask |= S_IWUSR|S_IWGRP|S_IWOTH;
}
/* same session same as owner */
if (kcm_is_same_session(client, ccache->uid, ccache->session)) {
if (read_p)
mask |= S_IROTH;
if (write_p)
mask |= S_IWOTH;
}
/* owner */
if (client->uid == ccache->uid) {
if (read_p)
mask |= S_IRUSR;
if (write_p)
mask |= S_IWUSR;
}
/* group */
if (client->gid == ccache->gid) {
if (read_p)
mask |= S_IRGRP;
if (write_p)
mask |= S_IWGRP;
}
ret = (ccache->mode & mask) ? 0 : KRB5_FCC_PERM;
out:
if (ret) {
kcm_log(2, "Process %d is not permitted to call %s on cache %s",
client->pid, kcm_op2string(opcode), ccache->name);
}
return ret;
}
krb5_error_code
kcm_chmod(krb5_context context,
kcm_client *client,
kcm_ccache ccache,
uint16_t mode)
{
KCM_ASSERT_VALID(ccache);
/* System cache mode can only be set at startup */
if (ccache->flags & KCM_FLAGS_OWNER_IS_SYSTEM)
return KRB5_FCC_PERM;
if (ccache->uid != client->uid)
return KRB5_FCC_PERM;
if (ccache->gid != client->gid)
return KRB5_FCC_PERM;
HEIMDAL_MUTEX_lock(&ccache->mutex);
ccache->mode = mode;
HEIMDAL_MUTEX_unlock(&ccache->mutex);
return 0;
}
krb5_error_code
kcm_chown(krb5_context context,
kcm_client *client,
kcm_ccache ccache,
uid_t uid,
gid_t gid)
{
KCM_ASSERT_VALID(ccache);
/* System cache owner can only be set at startup */
if (ccache->flags & KCM_FLAGS_OWNER_IS_SYSTEM)
return KRB5_FCC_PERM;
if (ccache->uid != client->uid)
return KRB5_FCC_PERM;
if (ccache->gid != client->gid)
return KRB5_FCC_PERM;
HEIMDAL_MUTEX_lock(&ccache->mutex);
ccache->uid = uid;
ccache->gid = gid;
HEIMDAL_MUTEX_unlock(&ccache->mutex);
return 0;
}
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