Viewing: mdt_identity.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2011, 2016, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*
* Author: Lai Siyao <lsy@clusterfs.com>
* Author: Fan Yong <fanyong@clusterfs.com>
*/
#define DEBUG_SUBSYSTEM S_MDS
#include "mdt_internal.h"
static void mdt_identity_entry_init(struct upcall_cache_entry *entry,
void *unused)
{
struct md_identity *identity = &entry->u.identity;
memset(identity, 0, sizeof(*identity));
identity->mi_uc_entry = entry;
}
static void mdt_identity_entry_free(struct upcall_cache *cache,
struct upcall_cache_entry *entry)
{
struct md_identity *identity = &entry->u.identity;
if (identity->mi_nperms) {
LASSERT(identity->mi_perms);
OBD_FREE_PTR_ARRAY(identity->mi_perms, identity->mi_nperms);
identity->mi_nperms = 0;
}
}
/*
* We have to do this action async since put_group_info could cause
* thread sleeping while uc_lock hold.
*/
static void mdt_identity_entry_free_work(struct work_struct *w)
{
struct md_identity *mi = container_of(w, struct md_identity, mi_work);
struct upcall_cache_entry *entry = mi->mi_uc_entry;
put_group_info(mi->mi_ginfo);
OBD_FREE(entry, sizeof(*entry));
}
static void mdt_identity_free_delay(struct upcall_cache_entry *entry)
{
struct md_identity *mi = &entry->u.identity;
if (mi->mi_ginfo) {
INIT_WORK(&mi->mi_work, mdt_identity_entry_free_work);
schedule_work(&mi->mi_work);
} else {
OBD_FREE(entry, sizeof(*entry));
}
}
static int mdt_identity_do_upcall(struct upcall_cache *cache,
struct upcall_cache_entry *entry)
{
char keystr[16];
char *argv[] = {
[0] = cache->uc_upcall,
[1] = cache->uc_name,
[2] = keystr,
[3] = NULL
};
char *envp[] = {
[0] = "HOME=/",
[1] = "PATH=/sbin:/usr/sbin",
[2] = NULL
};
ktime_t start, end;
int rc;
ENTRY;
/* There is race condition:
* "uc_upcall" was changed just after "is_identity_get_disabled" check.
*/
down_read(&cache->uc_upcall_rwsem);
CDEBUG(D_INFO, "The upcall is: '%s'\n", cache->uc_upcall);
if (unlikely(!strcmp(cache->uc_upcall, "NONE"))) {
rc = -EREMCHG;
CERROR("%s: extended identity requested for user '%llu' called with 'NONE' upcall: rc = %d\n",
cache->uc_name, entry->ue_key, rc);
GOTO(out, rc);
}
if (unlikely(cache->uc_upcall[0] == '\0')) {
rc = -EREMCHG;
CERROR("%s: extended identity requested for user '%llu' called with empty upcall: rc = %d\n",
cache->uc_name, entry->ue_key, rc);
GOTO(out, rc);
}
argv[0] = cache->uc_upcall;
snprintf(keystr, sizeof(keystr), "%llu", entry->ue_key);
start = ktime_get();
rc = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
end = ktime_get();
if (rc < 0) {
CERROR("%s: error invoking upcall %s %s %s: rc %d; check /proc/fs/lustre/mdt/%s/identity_upcall, time %ldus: rc = %d\n",
cache->uc_name, argv[0], argv[1], argv[2], rc,
cache->uc_name, (long)ktime_us_delta(end, start), rc);
} else {
CDEBUG(D_HA, "%s: invoked upcall %s %s %s, time %ldus\n",
cache->uc_name, argv[0], argv[1], argv[2],
(long)ktime_us_delta(end, start));
rc = 0;
}
EXIT;
out:
up_read(&cache->uc_upcall_rwsem);
return rc;
}
static int mdt_identity_parse_downcall(struct upcall_cache *cache,
struct upcall_cache_entry *entry,
void *args)
{
struct md_identity *identity = &entry->u.identity;
struct identity_downcall_data *data = args;
struct group_info *ginfo = NULL;
struct md_perm *perms = NULL;
int size, i, rc = 0;
ENTRY;
LASSERT(data);
if (data->idd_ngroups > NGROUPS_MAX) {
rc = -E2BIG;
CERROR("%s: UID %u groups %u > maximum %u: rc = %d\n",
cache->uc_name, data->idd_uid, data->idd_ngroups, NGROUPS_MAX, rc);
goto out;
}
if (data->idd_ngroups > 0) {
ginfo = groups_alloc(data->idd_ngroups);
if (!ginfo) {
rc = -ENOMEM;
CERROR("%s: failed to alloc %d groups: rc = %d\n",
cache->uc_name, data->idd_ngroups, rc);
goto out;
}
lustre_groups_from_list(ginfo, data->idd_groups);
lustre_groups_sort(ginfo);
lustre_print_groups(ginfo);
}
if (data->idd_nperms) {
size = data->idd_nperms * sizeof(*perms);
OBD_ALLOC(perms, size);
if (!perms) {
rc = -ENOMEM;
CERROR("%s: failed to alloc %d permissions: rc = %d\n",
cache->uc_name, data->idd_nperms, rc);
if (ginfo)
put_group_info(ginfo);
goto out;
}
for (i = 0; i < data->idd_nperms; i++) {
lnet_nid4_to_nid(data->idd_perms[i].pdd_nid,
&perms[i].mp_nid);
perms[i].mp_perm = data->idd_perms[i].pdd_perm;
}
}
identity->mi_uid = data->idd_uid;
identity->mi_gid = data->idd_gid;
identity->mi_ginfo = ginfo;
identity->mi_nperms = data->idd_nperms;
identity->mi_perms = perms;
CDEBUG(D_OTHER, "parse mdt identity@%p: %d:%d, ngroups %u, nperms %u\n",
identity, identity->mi_uid, identity->mi_gid,
data->idd_ngroups, data->idd_nperms);
out:
RETURN(rc);
}
struct md_identity *mdt_identity_get(struct upcall_cache *cache, __u32 uid,
struct mdt_thread_info *info)
{
struct upcall_cache_entry *entry;
if (!cache)
return ERR_PTR(-ENOENT);
entry = upcall_cache_get_entry(cache, (__u64)uid,
info ? mdt_ucred(info) : NULL);
if (unlikely(!entry))
return ERR_PTR(-ENOENT);
if (IS_ERR(entry))
return ERR_CAST(entry);
return &entry->u.identity;
}
void mdt_identity_put(struct upcall_cache *cache, struct md_identity *identity)
{
if (!cache)
return;
LASSERT(identity);
upcall_cache_put_entry(cache, identity->mi_uc_entry);
}
struct upcall_cache_ops mdt_identity_upcall_cache_ops = {
.init_entry = mdt_identity_entry_init,
.free_entry = mdt_identity_entry_free,
.free_delay = mdt_identity_free_delay,
.do_upcall = mdt_identity_do_upcall,
.parse_downcall = mdt_identity_parse_downcall,
};
void mdt_flush_identity(struct upcall_cache *cache, int uid)
{
if (uid < 0)
upcall_cache_flush_idle(cache);
else
upcall_cache_flush_one(cache, (__u64)uid, NULL);
}
/*
* If there is LNET_NID_ANY in perm[i].mp_nid,
* it must be perm[0].mp_nid, and act as default perm.
*/
__u32 mdt_identity_get_perm(struct md_identity *identity, struct lnet_nid *nid)
{
struct md_perm *perm;
int i;
if (!identity)
return CFS_SETGRP_PERM;
perm = identity->mi_perms;
/* check exactly matched nid first */
for (i = identity->mi_nperms - 1; i > 0; i--) {
if (!nid_same(&perm[i].mp_nid, nid))
continue;
return perm[i].mp_perm;
}
/* check LNET_NID_ANY then */
if ((identity->mi_nperms > 0) &&
((nid_same(&perm[0].mp_nid, nid)) ||
(LNET_NID_IS_ANY(&perm[0].mp_nid))))
return perm[0].mp_perm;
/* return default last */
return CFS_SETGRP_PERM;
}
