[linux.git] / fs / nfsd / nfs4idmap.c

/*
 *  Mapping of UID/GIDs to name and vice versa.
 *
 *  Copyright (c) 2002, 2003 The Regents of the University of
 *  Michigan.  All rights reserved.
 *
 *  Marius Aamodt Eriksen <[email protected]>
 *
 *  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 the University 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 ``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 THE REGENTS 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 <linux/module.h>
#include <linux/seq_file.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/sunrpc/svc_xprt.h>
#include <net/net_namespace.h>
#include "idmap.h"
#include "nfsd.h"
#include "netns.h"

/*
 * Turn off idmapping when using AUTH_SYS.
 */
static bool nfs4_disable_idmapping = true;
module_param(nfs4_disable_idmapping, bool, 0644);
MODULE_PARM_DESC(nfs4_disable_idmapping,
		"Turn off server's NFSv4 idmapping when using 'sec=sys'");

/*
 * Cache entry
 */

/*
 * XXX we know that IDMAP_NAMESZ < PAGE_SIZE, but it's ugly to rely on
 * that.
 */

#define IDMAP_TYPE_USER  0
#define IDMAP_TYPE_GROUP 1

struct ent {
	struct cache_head h;
	int               type;		       /* User / Group */
	uid_t             id;
	char              name[IDMAP_NAMESZ];
	char              authname[IDMAP_NAMESZ];
};

/* Common entry handling */

#define ENT_HASHBITS          8
#define ENT_HASHMAX           (1 << ENT_HASHBITS)

static void
ent_init(struct cache_head *cnew, struct cache_head *citm)
{
	struct ent *new = container_of(cnew, struct ent, h);
	struct ent *itm = container_of(citm, struct ent, h);

	new->id = itm->id;
	new->type = itm->type;

	strlcpy(new->name, itm->name, sizeof(new->name));
	strlcpy(new->authname, itm->authname, sizeof(new->name));
}

static void
ent_put(struct kref *ref)
{
	struct ent *map = container_of(ref, struct ent, h.ref);
	kfree(map);
}

static struct cache_head *
ent_alloc(void)
{
	struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL);
	if (e)
		return &e->h;
	else
		return NULL;
}

/*
 * ID -> Name cache
 */

static uint32_t
idtoname_hash(struct ent *ent)
{
	uint32_t hash;

	hash = hash_str(ent->authname, ENT_HASHBITS);
	hash = hash_long(hash ^ ent->id, ENT_HASHBITS);

	/* Flip LSB for user/group */
	if (ent->type == IDMAP_TYPE_GROUP)
		hash ^= 1;

	return hash;
}

static void
idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
    int *blen)
{
 	struct ent *ent = container_of(ch, struct ent, h);
	char idstr[11];

	qword_add(bpp, blen, ent->authname);
	snprintf(idstr, sizeof(idstr), "%u", ent->id);
	qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
	qword_add(bpp, blen, idstr);

	(*bpp)[-1] = '\n';
}

static int
idtoname_upcall(struct cache_detail *cd, struct cache_head *ch)
{
	return sunrpc_cache_pipe_upcall(cd, ch, idtoname_request);
}

static int
idtoname_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->id == b->id && a->type == b->type &&
	    strcmp(a->authname, b->authname) == 0);
}

static int
idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
{
	struct ent *ent;

	if (h == NULL) {
		seq_puts(m, "#domain type id [name]\n");
		return 0;
	}
	ent = container_of(h, struct ent, h);
	seq_printf(m, "%s %s %u", ent->authname,
			ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
			ent->id);
	if (test_bit(CACHE_VALID, &h->flags))
		seq_printf(m, " %s", ent->name);
	seq_printf(m, "\n");
	return 0;
}

static void
warn_no_idmapd(struct cache_detail *detail, int has_died)
{
	printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n",
			has_died ? "died" : "not been started");
}


static int         idtoname_parse(struct cache_detail *, char *, int);
static struct ent *idtoname_lookup(struct cache_detail *, struct ent *);
static struct ent *idtoname_update(struct cache_detail *, struct ent *,
				   struct ent *);

static struct cache_detail idtoname_cache_template = {
	.owner		= THIS_MODULE,
	.hash_size	= ENT_HASHMAX,
	.name		= "nfs4.idtoname",
	.cache_put	= ent_put,
	.cache_upcall	= idtoname_upcall,
	.cache_parse	= idtoname_parse,
	.cache_show	= idtoname_show,
	.warn_no_listener = warn_no_idmapd,
	.match		= idtoname_match,
	.init		= ent_init,
	.update		= ent_init,
	.alloc		= ent_alloc,
};

static int
idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
{
	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 */
	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
		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)
		goto out;
	if (len == 0)
		set_bit(CACHE_NEGATIVE, &ent.h.flags);
	else if (len >= IDMAP_NAMESZ)
		goto out;
	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_upcall(struct cache_detail *cd, struct cache_head *ch)
{
	return sunrpc_cache_pipe_upcall(cd, ch, nametoid_request);
}

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_upcall	= nametoid_upcall,
	.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 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 */
	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
		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 */
	error = qword_get(&buf, buf1, PAGE_SIZE);
	if (error <= 0 || error >= 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,
		uid_t *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 int
idmap_id_to_name(struct svc_rqst *rqstp, int type, uid_t id, char *name)
{
	struct ent *item, key = {
		.id = id,
		.type = type,
	};
	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 sprintf(name, "%u", id);
	if (ret)
		return ret;
	ret = strlen(item->name);
	BUG_ON(ret > IDMAP_NAMESZ);
	memcpy(name, item->name, ret);
	cache_put(&item->h, nn->idtoname_cache);
	return ret;
}

static bool
numeric_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, uid_t *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, uid_t *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 int
do_id_to_name(struct svc_rqst *rqstp, int type, uid_t id, char *name)
{
	if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
		return sprintf(name, "%u", id);
	return idmap_id_to_name(rqstp, type, id, name);
}

__be32
nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen,
		__u32 *id)
{
	return do_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, id);
}

__be32
nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen,
		__u32 *id)
{
	return do_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, id);
}

int
nfsd_map_uid_to_name(struct svc_rqst *rqstp, __u32 id, char *name)
{
	return do_id_to_name(rqstp, IDMAP_TYPE_USER, id, name);
}

int
nfsd_map_gid_to_name(struct svc_rqst *rqstp, __u32 id, char *name)
{
	return do_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name);
}
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* Mapping of UID/GIDs to name and vice versa.
	3	*
	4	* Copyright (c) 2002, 2003 The Regents of the University of
	5	* Michigan. All rights reserved.
	6	*
	7	* Marius Aamodt Eriksen <[email protected]>
	8	*
	9	* Redistribution and use in source and binary forms, with or without
	10	* modification, are permitted provided that the following conditions
	11	* are met:
	12	*
	13	* 1. Redistributions of source code must retain the above copyright
	14	* notice, this list of conditions and the following disclaimer.
	15	* 2. Redistributions in binary form must reproduce the above copyright
	16	* notice, this list of conditions and the following disclaimer in the
	17	* documentation and/or other materials provided with the distribution.
	18	* 3. Neither the name of the University nor the names of its
	19	* contributors may be used to endorse or promote products derived
	20	* from this software without specific prior written permission.
	21	*
	22	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	25	* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	26	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	27	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	28	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	29	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	30	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	31	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	32	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	33	*/
	34
1da177e4	35	#include <linux/module.h>
1da177e4	36	#include <linux/seq_file.h>
341eb184	37	#include <linux/sched.h>
5a0e3ad6	38	#include <linux/slab.h>
c2e76ef5	39	#include <linux/sunrpc/svc_xprt.h>
f5c8593b	40	#include <net/net_namespace.h>
2ca72e17	41	#include "idmap.h"
3c726023	42	#include "nfsd.h"
c2e76ef5	43	#include "netns.h"
1da177e4	44
e9541ce8 BF	45	/*
	46	* Turn off idmapping when using AUTH_SYS.
	47	*/
	48	static bool nfs4_disable_idmapping = true;
	49	module_param(nfs4_disable_idmapping, bool, 0644);
	50	MODULE_PARM_DESC(nfs4_disable_idmapping,
	51	"Turn off server's NFSv4 idmapping when using 'sec=sys'");
	52
1da177e4 LT	53	/*
	54	* Cache entry
	55	*/
	56
	57	/*
	58	* XXX we know that IDMAP_NAMESZ < PAGE_SIZE, but it's ugly to rely on
	59	* that.
	60	*/
	61
	62	#define IDMAP_TYPE_USER 0
	63	#define IDMAP_TYPE_GROUP 1
	64
	65	struct ent {
	66	struct cache_head h;
	67	int type; /* User / Group */
	68	uid_t id;
	69	char name[IDMAP_NAMESZ];
	70	char authname[IDMAP_NAMESZ];
	71	};
	72
1da177e4 LT	73	/* Common entry handling */
	74
	75	#define ENT_HASHBITS 8
	76	#define ENT_HASHMAX (1 << ENT_HASHBITS)
1da177e4	77
f9ecc921 N	78	static void
f9ecc921 N	79	ent_init(struct cache_head cnew, struct cache_head citm)
1da177e4	80	{
f9ecc921 N	81	struct ent *new = container_of(cnew, struct ent, h);
	82	struct ent *itm = container_of(citm, struct ent, h);
	83
1da177e4 LT	84	new->id = itm->id;
	85	new->type = itm->type;
	86
	87	strlcpy(new->name, itm->name, sizeof(new->name));
	88	strlcpy(new->authname, itm->authname, sizeof(new->name));
	89	}
	90
fd39ca9a	91	static void
baab935f	92	ent_put(struct kref *ref)
1da177e4	93	{
baab935f N	94	struct ent *map = container_of(ref, struct ent, h.ref);
baab935f N	95	kfree(map);
1da177e4 LT	96	}
1da177e4 LT	97
f9ecc921 N	98	static struct cache_head *
	99	ent_alloc(void)
	100	{
	101	struct ent e = kmalloc(sizeof(e), GFP_KERNEL);
	102	if (e)
	103	return &e->h;
	104	else
	105	return NULL;
	106	}
	107
1da177e4 LT	108	/*
	109	* ID -> Name cache
	110	*/
	111
1da177e4 LT	112	static uint32_t
	113	idtoname_hash(struct ent *ent)
	114	{
	115	uint32_t hash;
	116
	117	hash = hash_str(ent->authname, ENT_HASHBITS);
	118	hash = hash_long(hash ^ ent->id, ENT_HASHBITS);
	119
	120	/* Flip LSB for user/group */
	121	if (ent->type == IDMAP_TYPE_GROUP)
	122	hash ^= 1;
	123
	124	return hash;
	125	}
	126
	127	static void
	128	idtoname_request(struct cache_detail cd, struct cache_head ch, char **bpp,
	129	int *blen)
	130	{
	131	struct ent *ent = container_of(ch, struct ent, h);
	132	char idstr[11];
	133
	134	qword_add(bpp, blen, ent->authname);
0a725fc4	135	snprintf(idstr, sizeof(idstr), "%u", ent->id);
1da177e4 LT	136	qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
	137	qword_add(bpp, blen, idstr);
	138
	139	(*bpp)[-1] = '\n';
	140	}
	141
bc74b4f5 TM	142	static int
	143	idtoname_upcall(struct cache_detail cd, struct cache_head ch)
	144	{
	145	return sunrpc_cache_pipe_upcall(cd, ch, idtoname_request);
	146	}
	147
f9ecc921 N	148	static int
f9ecc921 N	149	idtoname_match(struct cache_head ca, struct cache_head cb)
1da177e4	150	{
f9ecc921 N	151	struct ent *a = container_of(ca, struct ent, h);
	152	struct ent *b = container_of(cb, struct ent, h);
	153
1da177e4 LT	154	return (a->id == b->id && a->type == b->type &&
	155	strcmp(a->authname, b->authname) == 0);
	156	}
	157
	158	static int
	159	idtoname_show(struct seq_file m, struct cache_detail cd, struct cache_head *h)
	160	{
	161	struct ent *ent;
	162
	163	if (h == NULL) {
	164	seq_puts(m, "#domain type id [name]\n");
	165	return 0;
	166	}
	167	ent = container_of(h, struct ent, h);
0a725fc4	168	seq_printf(m, "%s %s %u", ent->authname,
1da177e4 LT	169	ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
	170	ent->id);
	171	if (test_bit(CACHE_VALID, &h->flags))
	172	seq_printf(m, " %s", ent->name);
	173	seq_printf(m, "\n");
	174	return 0;
	175	}
	176
	177	static void
2da8ca26	178	warn_no_idmapd(struct cache_detail *detail, int has_died)
1da177e4 LT	179	{
1da177e4 LT	180	printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n",
2da8ca26	181	has_died ? "died" : "not been started");
1da177e4 LT	182	}
	183
	184
	185	static int idtoname_parse(struct cache_detail , char , int);
f890edbb SK	186	static struct ent idtoname_lookup(struct cache_detail , struct ent *);
	187	static struct ent idtoname_update(struct cache_detail , struct ent *,
	188	struct ent *);
1da177e4	189
c2e76ef5	190	static struct cache_detail idtoname_cache_template = {
f35279d3	191	.owner = THIS_MODULE,
1da177e4	192	.hash_size = ENT_HASHMAX,
1da177e4 LT	193	.name = "nfs4.idtoname",
1da177e4 LT	194	.cache_put = ent_put,
bc74b4f5	195	.cache_upcall = idtoname_upcall,
1da177e4 LT	196	.cache_parse = idtoname_parse,
	197	.cache_show = idtoname_show,
	198	.warn_no_listener = warn_no_idmapd,
f9ecc921 N	199	.match = idtoname_match,
	200	.init = ent_init,
	201	.update = ent_init,
	202	.alloc = ent_alloc,
1da177e4 LT	203	};
1da177e4 LT	204
a254b246	205	static int
1da177e4 LT	206	idtoname_parse(struct cache_detail cd, char buf, int buflen)
	207	{
	208	struct ent ent, *res;
	209	char buf1, bp;
c9b6cbe5	210	int len;
1da177e4 LT	211	int error = -EINVAL;
	212
	213	if (buf[buflen - 1] != '\n')
	214	return (-EINVAL);
	215	buf[buflen - 1]= '\0';
	216
	217	buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
	218	if (buf1 == NULL)
	219	return (-ENOMEM);
	220
	221	memset(&ent, 0, sizeof(ent));
	222
	223	/* Authentication name */
	224	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
	225	goto out;
	226	memcpy(ent.authname, buf1, sizeof(ent.authname));
	227
	228	/* Type */
	229	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
	230	goto out;
	231	ent.type = strcmp(buf1, "user") == 0 ?
	232	IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
	233
	234	/* ID */
	235	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
	236	goto out;
	237	ent.id = simple_strtoul(buf1, &bp, 10);
	238	if (bp == buf1)
	239	goto out;
	240
	241	/* expiry */
	242	ent.h.expiry_time = get_expiry(&buf);
	243	if (ent.h.expiry_time == 0)
	244	goto out;
	245
f9ecc921	246	error = -ENOMEM;
f890edbb	247	res = idtoname_lookup(cd, &ent);
f9ecc921 N	248	if (!res)
	249	goto out;
	250
1da177e4	251	/* Name */
c9b6cbe5 BF	252	error = -EINVAL;
	253	len = qword_get(&buf, buf1, PAGE_SIZE);
	254	if (len < 0)
1da177e4	255	goto out;
c9b6cbe5	256	if (len == 0)
1da177e4	257	set_bit(CACHE_NEGATIVE, &ent.h.flags);
d4395e03 BF	258	else if (len >= IDMAP_NAMESZ)
	259	goto out;
	260	else
1da177e4	261	memcpy(ent.name, buf1, sizeof(ent.name));
1da177e4	262	error = -ENOMEM;
f890edbb	263	res = idtoname_update(cd, &ent, res);
f9ecc921	264	if (res == NULL)
1da177e4 LT	265	goto out;
1da177e4 LT	266
f890edbb	267	cache_put(&res->h, cd);
1da177e4 LT	268
	269	error = 0;
	270	out:
	271	kfree(buf1);
	272
	273	return error;
	274	}
	275
f9ecc921 N	276
f9ecc921 N	277	static struct ent *
f890edbb	278	idtoname_lookup(struct cache_detail cd, struct ent item)
f9ecc921	279	{
f890edbb	280	struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
f9ecc921 N	281	idtoname_hash(item));
	282	if (ch)
	283	return container_of(ch, struct ent, h);
	284	else
	285	return NULL;
	286	}
	287
	288	static struct ent *
f890edbb	289	idtoname_update(struct cache_detail cd, struct ent new, struct ent *old)
f9ecc921	290	{
f890edbb	291	struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
f9ecc921 N	292	idtoname_hash(new));
	293	if (ch)
	294	return container_of(ch, struct ent, h);
	295	else
	296	return NULL;
	297	}
	298
1da177e4 LT	299
	300	/*
	301	* Name -> ID cache
	302	*/
	303
1da177e4 LT	304	static inline int
	305	nametoid_hash(struct ent *ent)
	306	{
	307	return hash_str(ent->name, ENT_HASHBITS);
	308	}
	309
fd39ca9a	310	static void
1da177e4 LT	311	nametoid_request(struct cache_detail cd, struct cache_head ch, char **bpp,
	312	int *blen)
	313	{
	314	struct ent *ent = container_of(ch, struct ent, h);
	315
	316	qword_add(bpp, blen, ent->authname);
	317	qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
	318	qword_add(bpp, blen, ent->name);
	319
	320	(*bpp)[-1] = '\n';
	321	}
	322
bc74b4f5 TM	323	static int
	324	nametoid_upcall(struct cache_detail cd, struct cache_head ch)
	325	{
	326	return sunrpc_cache_pipe_upcall(cd, ch, nametoid_request);
	327	}
	328
f9ecc921 N	329	static int
f9ecc921 N	330	nametoid_match(struct cache_head ca, struct cache_head cb)
1da177e4	331	{
f9ecc921 N	332	struct ent *a = container_of(ca, struct ent, h);
	333	struct ent *b = container_of(cb, struct ent, h);
	334
1da177e4 LT	335	return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
	336	strcmp(a->authname, b->authname) == 0);
	337	}
	338
	339	static int
	340	nametoid_show(struct seq_file m, struct cache_detail cd, struct cache_head *h)
	341	{
	342	struct ent *ent;
	343
	344	if (h == NULL) {
	345	seq_puts(m, "#domain type name [id]\n");
	346	return 0;
	347	}
	348	ent = container_of(h, struct ent, h);
	349	seq_printf(m, "%s %s %s", ent->authname,
	350	ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
	351	ent->name);
	352	if (test_bit(CACHE_VALID, &h->flags))
0a725fc4	353	seq_printf(m, " %u", ent->id);
1da177e4 LT	354	seq_printf(m, "\n");
	355	return 0;
	356	}
	357
f890edbb SK	358	static struct ent nametoid_lookup(struct cache_detail , struct ent *);
	359	static struct ent nametoid_update(struct cache_detail , struct ent *,
	360	struct ent *);
fd39ca9a	361	static int nametoid_parse(struct cache_detail , char , int);
1da177e4	362
9e75a4de	363	static struct cache_detail nametoid_cache_template = {
f35279d3	364	.owner = THIS_MODULE,
1da177e4	365	.hash_size = ENT_HASHMAX,
1da177e4 LT	366	.name = "nfs4.nametoid",
1da177e4 LT	367	.cache_put = ent_put,
bc74b4f5	368	.cache_upcall = nametoid_upcall,
1da177e4 LT	369	.cache_parse = nametoid_parse,
	370	.cache_show = nametoid_show,
	371	.warn_no_listener = warn_no_idmapd,
f9ecc921 N	372	.match = nametoid_match,
	373	.init = ent_init,
	374	.update = ent_init,
	375	.alloc = ent_alloc,
1da177e4 LT	376	};
1da177e4 LT	377
fd39ca9a	378	static int
1da177e4 LT	379	nametoid_parse(struct cache_detail cd, char buf, int buflen)
	380	{
	381	struct ent ent, *res;
	382	char *buf1;
	383	int error = -EINVAL;
	384
	385	if (buf[buflen - 1] != '\n')
	386	return (-EINVAL);
	387	buf[buflen - 1]= '\0';
	388
	389	buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
	390	if (buf1 == NULL)
	391	return (-ENOMEM);
	392
	393	memset(&ent, 0, sizeof(ent));
	394
	395	/* Authentication name */
	396	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
	397	goto out;
	398	memcpy(ent.authname, buf1, sizeof(ent.authname));
	399
	400	/* Type */
	401	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
	402	goto out;
	403	ent.type = strcmp(buf1, "user") == 0 ?
	404	IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
	405
	406	/* Name */
	407	error = qword_get(&buf, buf1, PAGE_SIZE);
	408	if (error <= 0 \|\| error >= IDMAP_NAMESZ)
	409	goto out;
	410	memcpy(ent.name, buf1, sizeof(ent.name));
	411
	412	/* expiry */
	413	ent.h.expiry_time = get_expiry(&buf);
	414	if (ent.h.expiry_time == 0)
	415	goto out;
	416
	417	/* ID */
	418	error = get_int(&buf, &ent.id);
	419	if (error == -EINVAL)
	420	goto out;
	421	if (error == -ENOENT)
	422	set_bit(CACHE_NEGATIVE, &ent.h.flags);
	423
	424	error = -ENOMEM;
f890edbb	425	res = nametoid_lookup(cd, &ent);
f9ecc921 N	426	if (res == NULL)
f9ecc921 N	427	goto out;
f890edbb	428	res = nametoid_update(cd, &ent, res);
f9ecc921	429	if (res == NULL)
1da177e4 LT	430	goto out;
1da177e4 LT	431
f890edbb	432	cache_put(&res->h, cd);
1da177e4 LT	433	error = 0;
	434	out:
	435	kfree(buf1);
	436
	437	return (error);
	438	}
	439
f9ecc921 N	440
f9ecc921 N	441	static struct ent *
f890edbb	442	nametoid_lookup(struct cache_detail cd, struct ent item)
f9ecc921	443	{
f890edbb	444	struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
f9ecc921 N	445	nametoid_hash(item));
	446	if (ch)
	447	return container_of(ch, struct ent, h);
	448	else
	449	return NULL;
	450	}
	451
	452	static struct ent *
f890edbb	453	nametoid_update(struct cache_detail cd, struct ent new, struct ent *old)
f9ecc921	454	{
f890edbb	455	struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
f9ecc921 N	456	nametoid_hash(new));
	457	if (ch)
	458	return container_of(ch, struct ent, h);
	459	else
	460	return NULL;
	461	}
1da177e4 LT	462
	463	/*
	464	* Exported API
	465	*/
	466
dbf847ec	467	int
43ec1a20	468	nfsd_idmap_init(struct net *net)
1da177e4	469	{
dbf847ec	470	int rv;
c2e76ef5	471	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
dbf847ec	472
c2e76ef5 SK	473	nn->idtoname_cache = cache_create_net(&idtoname_cache_template, net);
	474	if (IS_ERR(nn->idtoname_cache))
	475	return PTR_ERR(nn->idtoname_cache);
	476	rv = cache_register_net(nn->idtoname_cache, net);
dbf847ec	477	if (rv)
c2e76ef5	478	goto destroy_idtoname_cache;
9e75a4de SK	479	nn->nametoid_cache = cache_create_net(&nametoid_cache_template, net);
9e75a4de SK	480	if (IS_ERR(nn->nametoid_cache)) {
92566e28	481	rv = PTR_ERR(nn->nametoid_cache);
c2e76ef5	482	goto unregister_idtoname_cache;
9e75a4de SK	483	}
	484	rv = cache_register_net(nn->nametoid_cache, net);
	485	if (rv)
	486	goto destroy_nametoid_cache;
c2e76ef5 SK	487	return 0;
c2e76ef5 SK	488
9e75a4de SK	489	destroy_nametoid_cache:
9e75a4de SK	490	cache_destroy_net(nn->nametoid_cache, net);
c2e76ef5 SK	491	unregister_idtoname_cache:
	492	cache_unregister_net(nn->idtoname_cache, net);
	493	destroy_idtoname_cache:
	494	cache_destroy_net(nn->idtoname_cache, net);
dbf847ec	495	return rv;
1da177e4 LT	496	}
	497
	498	void
43ec1a20	499	nfsd_idmap_shutdown(struct net *net)
1da177e4	500	{
c2e76ef5 SK	501	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
	502
	503	cache_unregister_net(nn->idtoname_cache, net);
9e75a4de	504	cache_unregister_net(nn->nametoid_cache, net);
c2e76ef5	505	cache_destroy_net(nn->idtoname_cache, net);
9e75a4de	506	cache_destroy_net(nn->nametoid_cache, net);
1da177e4 LT	507	}
1da177e4 LT	508
1da177e4 LT	509	static int
1da177e4 LT	510	idmap_lookup(struct svc_rqst *rqstp,
f890edbb SK	511	struct ent (lookup_fn)(struct cache_detail , struct ent ),
f890edbb SK	512	struct ent key, struct cache_detail detail, struct ent **item)
1da177e4	513	{
1da177e4 LT	514	int ret;
1da177e4 LT	515
f890edbb	516	*item = lookup_fn(detail, key);
839049a8	517	if (!*item)
1da177e4	518	return -ENOMEM;
839049a8 N	519	retry:
	520	ret = cache_check(detail, &(*item)->h, &rqstp->rq_chandle);
	521
	522	if (ret == -ETIMEDOUT) {
	523	struct ent prev_item = item;
f890edbb	524	*item = lookup_fn(detail, key);
839049a8 N	525	if (*item != prev_item)
	526	goto retry;
	527	cache_put(&(*item)->h, detail);
1da177e4	528	}
1da177e4 LT	529	return ret;
	530	}
	531
3ab4d8b1 BF	532	static char *
	533	rqst_authname(struct svc_rqst *rqstp)
	534	{
	535	struct auth_domain *clp;
	536
	537	clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client;
	538	return clp->name;
	539	}
	540
3c726023	541	static __be32
1da177e4 LT	542	idmap_name_to_id(struct svc_rqst rqstp, int type, const char name, u32 namelen,
	543	uid_t *id)
	544	{
	545	struct ent *item, key = {
	546	.type = type,
	547	};
	548	int ret;
9695c705	549	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1da177e4 LT	550
1da177e4 LT	551	if (namelen + 1 > sizeof(key.name))
3c726023	552	return nfserr_badowner;
1da177e4 LT	553	memcpy(key.name, name, namelen);
1da177e4 LT	554	key.name[namelen] = '\0';
3ab4d8b1	555	strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
9e75a4de	556	ret = idmap_lookup(rqstp, nametoid_lookup, &key, nn->nametoid_cache, &item);
1da177e4	557	if (ret == -ENOENT)
3c726023	558	return nfserr_badowner;
1da177e4	559	if (ret)
3c726023	560	return nfserrno(ret);
1da177e4	561	*id = item->id;
9e75a4de	562	cache_put(&item->h, nn->nametoid_cache);
1da177e4 LT	563	return 0;
	564	}
	565
	566	static int
	567	idmap_id_to_name(struct svc_rqst rqstp, int type, uid_t id, char name)
	568	{
	569	struct ent *item, key = {
	570	.id = id,
	571	.type = type,
	572	};
	573	int ret;
9695c705	574	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1da177e4	575
3ab4d8b1	576	strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
c2e76ef5	577	ret = idmap_lookup(rqstp, idtoname_lookup, &key, nn->idtoname_cache, &item);
1da177e4 LT	578	if (ret == -ENOENT)
	579	return sprintf(name, "%u", id);
	580	if (ret)
	581	return ret;
	582	ret = strlen(item->name);
	583	BUG_ON(ret > IDMAP_NAMESZ);
	584	memcpy(name, item->name, ret);
c2e76ef5	585	cache_put(&item->h, nn->idtoname_cache);
1da177e4 LT	586	return ret;
	587	}
	588
e9541ce8 BF	589	static bool
	590	numeric_name_to_id(struct svc_rqst rqstp, int type, const char name, u32 namelen, uid_t *id)
	591	{
	592	int ret;
	593	char buf[11];
	594
	595	if (namelen + 1 > sizeof(buf))
	596	/* too long to represent a 32-bit id: */
	597	return false;
	598	/* Just to make sure it's null-terminated: */
	599	memcpy(buf, name, namelen);
	600	buf[namelen] = '\0';
9959ba0c	601	ret = kstrtouint(buf, 10, id);
e9541ce8 BF	602	return ret == 0;
	603	}
	604
	605	static __be32
	606	do_name_to_id(struct svc_rqst rqstp, int type, const char name, u32 namelen, uid_t *id)
	607	{
d5497fc6	608	if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
e9541ce8 BF	609	if (numeric_name_to_id(rqstp, type, name, namelen, id))
	610	return 0;
	611	/*
	612	* otherwise, fall through and try idmapping, for
	613	* backwards compatibility with clients sending names:
	614	*/
	615	return idmap_name_to_id(rqstp, type, name, namelen, id);
	616	}
	617
	618	static int
	619	do_id_to_name(struct svc_rqst rqstp, int type, uid_t id, char name)
	620	{
d5497fc6	621	if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
e9541ce8 BF	622	return sprintf(name, "%u", id);
	623	return idmap_id_to_name(rqstp, type, id, name);
	624	}
	625
3c726023	626	__be32
1da177e4 LT	627	nfsd_map_name_to_uid(struct svc_rqst rqstp, const char name, size_t namelen,
	628	__u32 *id)
	629	{
e9541ce8	630	return do_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, id);
1da177e4 LT	631	}
1da177e4 LT	632
3c726023	633	__be32
1da177e4 LT	634	nfsd_map_name_to_gid(struct svc_rqst rqstp, const char name, size_t namelen,
	635	__u32 *id)
	636	{
e9541ce8	637	return do_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, id);
1da177e4 LT	638	}
	639
	640	int
	641	nfsd_map_uid_to_name(struct svc_rqst rqstp, __u32 id, char name)
	642	{
e9541ce8	643	return do_id_to_name(rqstp, IDMAP_TYPE_USER, id, name);
1da177e4 LT	644	}
	645
	646	int
	647	nfsd_map_gid_to_name(struct svc_rqst rqstp, __u32 id, char name)
	648	{
e9541ce8	649	return do_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name);
1da177e4	650	}