664 lines
16 KiB
C
664 lines
16 KiB
C
|
/*
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||
|
|
* Mapping of UID/GIDs to name and vice versa.
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*
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* Copyright (c) 2002, 2003 The Regents of the University of
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* Michigan. All rights reserved.
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*
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||
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* Marius Aamodt Eriksen <marius@umich.edu>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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|
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* notice, this list of conditions and the following disclaimer in the
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|
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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|
*/
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#include <linux/module.h>
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#include <linux/seq_file.h>
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||
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|
#include <linux/sched.h>
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||
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|
#include <linux/slab.h>
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||
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|
#include <linux/sunrpc/svc_xprt.h>
|
||
|
|
#include <net/net_namespace.h>
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||
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|
#include "idmap.h"
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||
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|
#include "nfsd.h"
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||
|
|
#include "netns.h"
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||
|
|
|
||
|
|
/*
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||
|
|
* Turn off idmapping when using AUTH_SYS.
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||
|
|
*/
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||
|
|
static bool nfs4_disable_idmapping = true;
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||
|
|
module_param(nfs4_disable_idmapping, bool, 0644);
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||
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|
MODULE_PARM_DESC(nfs4_disable_idmapping,
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||
|
|
"Turn off server's NFSv4 idmapping when using 'sec=sys'");
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|
|
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||
|
|
/*
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||
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|
* Cache entry
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|
|
*/
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|
|
||
|
|
/*
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||
|
|
* XXX we know that IDMAP_NAMESZ < PAGE_SIZE, but it's ugly to rely on
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|
|
* that.
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|
*/
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|
|
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struct ent {
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||
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|
struct cache_head h;
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||
|
|
int type; /* User / Group */
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||
|
|
u32 id;
|
||
|
|
char name[IDMAP_NAMESZ];
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||
|
|
char authname[IDMAP_NAMESZ];
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||
|
|
};
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|
|
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||
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|
/* Common entry handling */
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||
|
|
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||
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|
#define ENT_HASHBITS 8
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||
|
|
#define ENT_HASHMAX (1 << ENT_HASHBITS)
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|
|
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||
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|
static void
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||
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|
ent_init(struct cache_head *cnew, struct cache_head *citm)
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||
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|
{
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||
|
|
struct ent *new = container_of(cnew, struct ent, h);
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||
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|
struct ent *itm = container_of(citm, struct ent, h);
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new->id = itm->id;
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new->type = itm->type;
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strlcpy(new->name, itm->name, sizeof(new->name));
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strlcpy(new->authname, itm->authname, sizeof(new->name));
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|
}
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|
|
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|
static void
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||
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|
ent_put(struct kref *ref)
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||
|
|
{
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||
|
|
struct ent *map = container_of(ref, struct ent, h.ref);
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||
|
|
kfree(map);
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|
}
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|
|
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|
static struct cache_head *
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|
ent_alloc(void)
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|
{
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|
struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL);
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|
if (e)
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|
return &e->h;
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|
|
else
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|
return NULL;
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||
|
|
}
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|
|
|
||
|
|
/*
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||
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|
* ID -> Name cache
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|
*/
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|
|
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static uint32_t
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||
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|
idtoname_hash(struct ent *ent)
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|
|
{
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|
uint32_t hash;
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|
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hash = hash_str(ent->authname, ENT_HASHBITS);
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hash = hash_long(hash ^ ent->id, ENT_HASHBITS);
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|
|
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|
|
/* Flip LSB for user/group */
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|
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if (ent->type == IDMAP_TYPE_GROUP)
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hash ^= 1;
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return hash;
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|
}
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|
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static void
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|
idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
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|
int *blen)
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|
{
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|
struct ent *ent = container_of(ch, struct ent, h);
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|
char idstr[11];
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|
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|
qword_add(bpp, blen, ent->authname);
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snprintf(idstr, sizeof(idstr), "%u", ent->id);
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qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
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qword_add(bpp, blen, idstr);
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(*bpp)[-1] = '\n';
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||
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|
}
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||
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|
static int
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||
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|
idtoname_match(struct cache_head *ca, struct cache_head *cb)
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||
|
|
{
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||
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|
struct ent *a = container_of(ca, struct ent, h);
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||
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|
struct ent *b = container_of(cb, struct ent, h);
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||
|
|
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||
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|
return (a->id == b->id && a->type == b->type &&
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||
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|
strcmp(a->authname, b->authname) == 0);
|
||
|
|
}
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||
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|
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||
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|
static int
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||
|
|
idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
|
||
|
|
{
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||
|
|
struct ent *ent;
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||
|
|
|
||
|
|
if (h == NULL) {
|
||
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|
seq_puts(m, "#domain type id [name]\n");
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||
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|
return 0;
|
||
|
|
}
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||
|
|
ent = container_of(h, struct ent, h);
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||
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|
seq_printf(m, "%s %s %u", ent->authname,
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||
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|
ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
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||
|
|
ent->id);
|
||
|
|
if (test_bit(CACHE_VALID, &h->flags))
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||
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|
seq_printf(m, " %s", ent->name);
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||
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|
seq_printf(m, "\n");
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||
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|
return 0;
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||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
warn_no_idmapd(struct cache_detail *detail, int has_died)
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||
|
|
{
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|
printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n",
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|
has_died ? "died" : "not been started");
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||
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|
}
|
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|
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static int idtoname_parse(struct cache_detail *, char *, int);
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|
static struct ent *idtoname_lookup(struct cache_detail *, struct ent *);
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static struct ent *idtoname_update(struct cache_detail *, struct ent *,
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|
struct ent *);
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||
|
|
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static struct cache_detail idtoname_cache_template = {
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.owner = THIS_MODULE,
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.hash_size = ENT_HASHMAX,
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||
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.name = "nfs4.idtoname",
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||
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.cache_put = ent_put,
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||
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.cache_request = idtoname_request,
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||
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.cache_parse = idtoname_parse,
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|
|
.cache_show = idtoname_show,
|
||
|
|
.warn_no_listener = warn_no_idmapd,
|
||
|
|
.match = idtoname_match,
|
||
|
|
.init = ent_init,
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||
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|
.update = ent_init,
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|
.alloc = ent_alloc,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int
|
||
|
|
idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
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||
|
|
{
|
||
|
|
struct ent ent, *res;
|
||
|
|
char *buf1, *bp;
|
||
|
|
int len;
|
||
|
|
int error = -EINVAL;
|
||
|
|
|
||
|
|
if (buf[buflen - 1] != '\n')
|
||
|
|
return (-EINVAL);
|
||
|
|
buf[buflen - 1]= '\0';
|
||
|
|
|
||
|
|
buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
||
|
|
if (buf1 == NULL)
|
||
|
|
return (-ENOMEM);
|
||
|
|
|
||
|
|
memset(&ent, 0, sizeof(ent));
|
||
|
|
|
||
|
|
/* Authentication name */
|
||
|
|
len = qword_get(&buf, buf1, PAGE_SIZE);
|
||
|
|
if (len <= 0 || len >= IDMAP_NAMESZ)
|
||
|
|
goto out;
|
||
|
|
memcpy(ent.authname, buf1, sizeof(ent.authname));
|
||
|
|
|
||
|
|
/* Type */
|
||
|
|
if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
|
||
|
|
goto out;
|
||
|
|
ent.type = strcmp(buf1, "user") == 0 ?
|
||
|
|
IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
|
||
|
|
|
||
|
|
/* ID */
|
||
|
|
if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
|
||
|
|
goto out;
|
||
|
|
ent.id = simple_strtoul(buf1, &bp, 10);
|
||
|
|
if (bp == buf1)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
/* expiry */
|
||
|
|
ent.h.expiry_time = get_expiry(&buf);
|
||
|
|
if (ent.h.expiry_time == 0)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
error = -ENOMEM;
|
||
|
|
res = idtoname_lookup(cd, &ent);
|
||
|
|
if (!res)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
/* Name */
|
||
|
|
error = -EINVAL;
|
||
|
|
len = qword_get(&buf, buf1, PAGE_SIZE);
|
||
|
|
if (len < 0 || len >= IDMAP_NAMESZ)
|
||
|
|
goto out;
|
||
|
|
if (len == 0)
|
||
|
|
set_bit(CACHE_NEGATIVE, &ent.h.flags);
|
||
|
|
else
|
||
|
|
memcpy(ent.name, buf1, sizeof(ent.name));
|
||
|
|
error = -ENOMEM;
|
||
|
|
res = idtoname_update(cd, &ent, res);
|
||
|
|
if (res == NULL)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
cache_put(&res->h, cd);
|
||
|
|
error = 0;
|
||
|
|
out:
|
||
|
|
kfree(buf1);
|
||
|
|
return error;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct ent *
|
||
|
|
idtoname_lookup(struct cache_detail *cd, struct ent *item)
|
||
|
|
{
|
||
|
|
struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
|
||
|
|
idtoname_hash(item));
|
||
|
|
if (ch)
|
||
|
|
return container_of(ch, struct ent, h);
|
||
|
|
else
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct ent *
|
||
|
|
idtoname_update(struct cache_detail *cd, struct ent *new, struct ent *old)
|
||
|
|
{
|
||
|
|
struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
|
||
|
|
idtoname_hash(new));
|
||
|
|
if (ch)
|
||
|
|
return container_of(ch, struct ent, h);
|
||
|
|
else
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Name -> ID cache
|
||
|
|
*/
|
||
|
|
|
||
|
|
static inline int
|
||
|
|
nametoid_hash(struct ent *ent)
|
||
|
|
{
|
||
|
|
return hash_str(ent->name, ENT_HASHBITS);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
|
||
|
|
int *blen)
|
||
|
|
{
|
||
|
|
struct ent *ent = container_of(ch, struct ent, h);
|
||
|
|
|
||
|
|
qword_add(bpp, blen, ent->authname);
|
||
|
|
qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
|
||
|
|
qword_add(bpp, blen, ent->name);
|
||
|
|
|
||
|
|
(*bpp)[-1] = '\n';
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
nametoid_match(struct cache_head *ca, struct cache_head *cb)
|
||
|
|
{
|
||
|
|
struct ent *a = container_of(ca, struct ent, h);
|
||
|
|
struct ent *b = container_of(cb, struct ent, h);
|
||
|
|
|
||
|
|
return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
|
||
|
|
strcmp(a->authname, b->authname) == 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
|
||
|
|
{
|
||
|
|
struct ent *ent;
|
||
|
|
|
||
|
|
if (h == NULL) {
|
||
|
|
seq_puts(m, "#domain type name [id]\n");
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
ent = container_of(h, struct ent, h);
|
||
|
|
seq_printf(m, "%s %s %s", ent->authname,
|
||
|
|
ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
|
||
|
|
ent->name);
|
||
|
|
if (test_bit(CACHE_VALID, &h->flags))
|
||
|
|
seq_printf(m, " %u", ent->id);
|
||
|
|
seq_printf(m, "\n");
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct ent *nametoid_lookup(struct cache_detail *, struct ent *);
|
||
|
|
static struct ent *nametoid_update(struct cache_detail *, struct ent *,
|
||
|
|
struct ent *);
|
||
|
|
static int nametoid_parse(struct cache_detail *, char *, int);
|
||
|
|
|
||
|
|
static struct cache_detail nametoid_cache_template = {
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.hash_size = ENT_HASHMAX,
|
||
|
|
.name = "nfs4.nametoid",
|
||
|
|
.cache_put = ent_put,
|
||
|
|
.cache_request = nametoid_request,
|
||
|
|
.cache_parse = nametoid_parse,
|
||
|
|
.cache_show = nametoid_show,
|
||
|
|
.warn_no_listener = warn_no_idmapd,
|
||
|
|
.match = nametoid_match,
|
||
|
|
.init = ent_init,
|
||
|
|
.update = ent_init,
|
||
|
|
.alloc = ent_alloc,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int
|
||
|
|
nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
|
||
|
|
{
|
||
|
|
struct ent ent, *res;
|
||
|
|
char *buf1;
|
||
|
|
int len, error = -EINVAL;
|
||
|
|
|
||
|
|
if (buf[buflen - 1] != '\n')
|
||
|
|
return (-EINVAL);
|
||
|
|
buf[buflen - 1]= '\0';
|
||
|
|
|
||
|
|
buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
||
|
|
if (buf1 == NULL)
|
||
|
|
return (-ENOMEM);
|
||
|
|
|
||
|
|
memset(&ent, 0, sizeof(ent));
|
||
|
|
|
||
|
|
/* Authentication name */
|
||
|
|
len = qword_get(&buf, buf1, PAGE_SIZE);
|
||
|
|
if (len <= 0 || len >= IDMAP_NAMESZ)
|
||
|
|
goto out;
|
||
|
|
memcpy(ent.authname, buf1, sizeof(ent.authname));
|
||
|
|
|
||
|
|
/* Type */
|
||
|
|
if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
|
||
|
|
goto out;
|
||
|
|
ent.type = strcmp(buf1, "user") == 0 ?
|
||
|
|
IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
|
||
|
|
|
||
|
|
/* Name */
|
||
|
|
len = qword_get(&buf, buf1, PAGE_SIZE);
|
||
|
|
if (len <= 0 || len >= IDMAP_NAMESZ)
|
||
|
|
goto out;
|
||
|
|
memcpy(ent.name, buf1, sizeof(ent.name));
|
||
|
|
|
||
|
|
/* expiry */
|
||
|
|
ent.h.expiry_time = get_expiry(&buf);
|
||
|
|
if (ent.h.expiry_time == 0)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
/* ID */
|
||
|
|
error = get_int(&buf, &ent.id);
|
||
|
|
if (error == -EINVAL)
|
||
|
|
goto out;
|
||
|
|
if (error == -ENOENT)
|
||
|
|
set_bit(CACHE_NEGATIVE, &ent.h.flags);
|
||
|
|
|
||
|
|
error = -ENOMEM;
|
||
|
|
res = nametoid_lookup(cd, &ent);
|
||
|
|
if (res == NULL)
|
||
|
|
goto out;
|
||
|
|
res = nametoid_update(cd, &ent, res);
|
||
|
|
if (res == NULL)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
cache_put(&res->h, cd);
|
||
|
|
error = 0;
|
||
|
|
out:
|
||
|
|
kfree(buf1);
|
||
|
|
return (error);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static struct ent *
|
||
|
|
nametoid_lookup(struct cache_detail *cd, struct ent *item)
|
||
|
|
{
|
||
|
|
struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
|
||
|
|
nametoid_hash(item));
|
||
|
|
if (ch)
|
||
|
|
return container_of(ch, struct ent, h);
|
||
|
|
else
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct ent *
|
||
|
|
nametoid_update(struct cache_detail *cd, struct ent *new, struct ent *old)
|
||
|
|
{
|
||
|
|
struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
|
||
|
|
nametoid_hash(new));
|
||
|
|
if (ch)
|
||
|
|
return container_of(ch, struct ent, h);
|
||
|
|
else
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Exported API
|
||
|
|
*/
|
||
|
|
|
||
|
|
int
|
||
|
|
nfsd_idmap_init(struct net *net)
|
||
|
|
{
|
||
|
|
int rv;
|
||
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
||
|
|
|
||
|
|
nn->idtoname_cache = cache_create_net(&idtoname_cache_template, net);
|
||
|
|
if (IS_ERR(nn->idtoname_cache))
|
||
|
|
return PTR_ERR(nn->idtoname_cache);
|
||
|
|
rv = cache_register_net(nn->idtoname_cache, net);
|
||
|
|
if (rv)
|
||
|
|
goto destroy_idtoname_cache;
|
||
|
|
nn->nametoid_cache = cache_create_net(&nametoid_cache_template, net);
|
||
|
|
if (IS_ERR(nn->nametoid_cache)) {
|
||
|
|
rv = PTR_ERR(nn->nametoid_cache);
|
||
|
|
goto unregister_idtoname_cache;
|
||
|
|
}
|
||
|
|
rv = cache_register_net(nn->nametoid_cache, net);
|
||
|
|
if (rv)
|
||
|
|
goto destroy_nametoid_cache;
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
destroy_nametoid_cache:
|
||
|
|
cache_destroy_net(nn->nametoid_cache, net);
|
||
|
|
unregister_idtoname_cache:
|
||
|
|
cache_unregister_net(nn->idtoname_cache, net);
|
||
|
|
destroy_idtoname_cache:
|
||
|
|
cache_destroy_net(nn->idtoname_cache, net);
|
||
|
|
return rv;
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
nfsd_idmap_shutdown(struct net *net)
|
||
|
|
{
|
||
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
||
|
|
|
||
|
|
cache_unregister_net(nn->idtoname_cache, net);
|
||
|
|
cache_unregister_net(nn->nametoid_cache, net);
|
||
|
|
cache_destroy_net(nn->idtoname_cache, net);
|
||
|
|
cache_destroy_net(nn->nametoid_cache, net);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
idmap_lookup(struct svc_rqst *rqstp,
|
||
|
|
struct ent *(*lookup_fn)(struct cache_detail *, struct ent *),
|
||
|
|
struct ent *key, struct cache_detail *detail, struct ent **item)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
*item = lookup_fn(detail, key);
|
||
|
|
if (!*item)
|
||
|
|
return -ENOMEM;
|
||
|
|
retry:
|
||
|
|
ret = cache_check(detail, &(*item)->h, &rqstp->rq_chandle);
|
||
|
|
|
||
|
|
if (ret == -ETIMEDOUT) {
|
||
|
|
struct ent *prev_item = *item;
|
||
|
|
*item = lookup_fn(detail, key);
|
||
|
|
if (*item != prev_item)
|
||
|
|
goto retry;
|
||
|
|
cache_put(&(*item)->h, detail);
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static char *
|
||
|
|
rqst_authname(struct svc_rqst *rqstp)
|
||
|
|
{
|
||
|
|
struct auth_domain *clp;
|
||
|
|
|
||
|
|
clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client;
|
||
|
|
return clp->name;
|
||
|
|
}
|
||
|
|
|
||
|
|
static __be32
|
||
|
|
idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen,
|
||
|
|
u32 *id)
|
||
|
|
{
|
||
|
|
struct ent *item, key = {
|
||
|
|
.type = type,
|
||
|
|
};
|
||
|
|
int ret;
|
||
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
||
|
|
|
||
|
|
if (namelen + 1 > sizeof(key.name))
|
||
|
|
return nfserr_badowner;
|
||
|
|
memcpy(key.name, name, namelen);
|
||
|
|
key.name[namelen] = '\0';
|
||
|
|
strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
|
||
|
|
ret = idmap_lookup(rqstp, nametoid_lookup, &key, nn->nametoid_cache, &item);
|
||
|
|
if (ret == -ENOENT)
|
||
|
|
return nfserr_badowner;
|
||
|
|
if (ret)
|
||
|
|
return nfserrno(ret);
|
||
|
|
*id = item->id;
|
||
|
|
cache_put(&item->h, nn->nametoid_cache);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static __be32 encode_ascii_id(struct xdr_stream *xdr, u32 id)
|
||
|
|
{
|
||
|
|
char buf[11];
|
||
|
|
int len;
|
||
|
|
__be32 *p;
|
||
|
|
|
||
|
|
len = sprintf(buf, "%u", id);
|
||
|
|
p = xdr_reserve_space(xdr, len + 4);
|
||
|
|
if (!p)
|
||
|
|
return nfserr_resource;
|
||
|
|
p = xdr_encode_opaque(p, buf, len);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static __be32 idmap_id_to_name(struct xdr_stream *xdr,
|
||
|
|
struct svc_rqst *rqstp, int type, u32 id)
|
||
|
|
{
|
||
|
|
struct ent *item, key = {
|
||
|
|
.id = id,
|
||
|
|
.type = type,
|
||
|
|
};
|
||
|
|
__be32 *p;
|
||
|
|
int ret;
|
||
|
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
|
||
|
|
|
||
|
|
strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
|
||
|
|
ret = idmap_lookup(rqstp, idtoname_lookup, &key, nn->idtoname_cache, &item);
|
||
|
|
if (ret == -ENOENT)
|
||
|
|
return encode_ascii_id(xdr, id);
|
||
|
|
if (ret)
|
||
|
|
return nfserrno(ret);
|
||
|
|
ret = strlen(item->name);
|
||
|
|
WARN_ON_ONCE(ret > IDMAP_NAMESZ);
|
||
|
|
p = xdr_reserve_space(xdr, ret + 4);
|
||
|
|
if (!p)
|
||
|
|
return nfserr_resource;
|
||
|
|
p = xdr_encode_opaque(p, item->name, ret);
|
||
|
|
cache_put(&item->h, nn->idtoname_cache);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static bool
|
||
|
|
numeric_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
char buf[11];
|
||
|
|
|
||
|
|
if (namelen + 1 > sizeof(buf))
|
||
|
|
/* too long to represent a 32-bit id: */
|
||
|
|
return false;
|
||
|
|
/* Just to make sure it's null-terminated: */
|
||
|
|
memcpy(buf, name, namelen);
|
||
|
|
buf[namelen] = '\0';
|
||
|
|
ret = kstrtouint(buf, 10, id);
|
||
|
|
return ret == 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static __be32
|
||
|
|
do_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id)
|
||
|
|
{
|
||
|
|
if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
|
||
|
|
if (numeric_name_to_id(rqstp, type, name, namelen, id))
|
||
|
|
return 0;
|
||
|
|
/*
|
||
|
|
* otherwise, fall through and try idmapping, for
|
||
|
|
* backwards compatibility with clients sending names:
|
||
|
|
*/
|
||
|
|
return idmap_name_to_id(rqstp, type, name, namelen, id);
|
||
|
|
}
|
||
|
|
|
||
|
|
static __be32 encode_name_from_id(struct xdr_stream *xdr,
|
||
|
|
struct svc_rqst *rqstp, int type, u32 id)
|
||
|
|
{
|
||
|
|
if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
|
||
|
|
return encode_ascii_id(xdr, id);
|
||
|
|
return idmap_id_to_name(xdr, rqstp, type, id);
|
||
|
|
}
|
||
|
|
|
||
|
|
__be32
|
||
|
|
nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen,
|
||
|
|
kuid_t *uid)
|
||
|
|
{
|
||
|
|
__be32 status;
|
||
|
|
u32 id = -1;
|
||
|
|
status = do_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, &id);
|
||
|
|
*uid = make_kuid(&init_user_ns, id);
|
||
|
|
if (!uid_valid(*uid))
|
||
|
|
status = nfserr_badowner;
|
||
|
|
return status;
|
||
|
|
}
|
||
|
|
|
||
|
|
__be32
|
||
|
|
nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen,
|
||
|
|
kgid_t *gid)
|
||
|
|
{
|
||
|
|
__be32 status;
|
||
|
|
u32 id = -1;
|
||
|
|
status = do_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, &id);
|
||
|
|
*gid = make_kgid(&init_user_ns, id);
|
||
|
|
if (!gid_valid(*gid))
|
||
|
|
status = nfserr_badowner;
|
||
|
|
return status;
|
||
|
|
}
|
||
|
|
|
||
|
|
__be32 nfsd4_encode_user(struct xdr_stream *xdr, struct svc_rqst *rqstp,
|
||
|
|
kuid_t uid)
|
||
|
|
{
|
||
|
|
u32 id = from_kuid(&init_user_ns, uid);
|
||
|
|
return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_USER, id);
|
||
|
|
}
|
||
|
|
|
||
|
|
__be32 nfsd4_encode_group(struct xdr_stream *xdr, struct svc_rqst *rqstp,
|
||
|
|
kgid_t gid)
|
||
|
|
{
|
||
|
|
u32 id = from_kgid(&init_user_ns, gid);
|
||
|
|
return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_GROUP, id);
|
||
|
|
}
|