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Diffstat (limited to 'fs/nfsd/nfs4idmap.c')
-rw-r--r--fs/nfsd/nfs4idmap.c240
1 files changed, 161 insertions, 79 deletions
diff --git a/fs/nfsd/nfs4idmap.c b/fs/nfsd/nfs4idmap.c
index 94096273cd6..a0ab0a847d6 100644
--- a/fs/nfsd/nfs4idmap.c
+++ b/fs/nfsd/nfs4idmap.c
@@ -36,9 +36,19 @@
#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
@@ -55,7 +65,7 @@
struct ent {
struct cache_head h;
int type; /* User / Group */
- uid_t id;
+ u32 id;
char name[IDMAP_NAMESZ];
char authname[IDMAP_NAMESZ];
};
@@ -99,8 +109,6 @@ ent_alloc(void)
* ID -> Name cache
*/
-static struct cache_head *idtoname_table[ENT_HASHMAX];
-
static uint32_t
idtoname_hash(struct ent *ent)
{
@@ -132,12 +140,6 @@ idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
}
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);
@@ -175,16 +177,16 @@ warn_no_idmapd(struct cache_detail *detail, int has_died)
static int idtoname_parse(struct cache_detail *, char *, int);
-static struct ent *idtoname_lookup(struct ent *);
-static struct ent *idtoname_update(struct ent *, struct ent *);
+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 = {
+static struct cache_detail idtoname_cache_template = {
.owner = THIS_MODULE,
.hash_size = ENT_HASHMAX,
- .hash_table = idtoname_table,
.name = "nfs4.idtoname",
.cache_put = ent_put,
- .cache_upcall = idtoname_upcall,
+ .cache_request = idtoname_request,
.cache_parse = idtoname_parse,
.cache_show = idtoname_show,
.warn_no_listener = warn_no_idmapd,
@@ -236,7 +238,7 @@ idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
goto out;
error = -ENOMEM;
- res = idtoname_lookup(&ent);
+ res = idtoname_lookup(cd, &ent);
if (!res)
goto out;
@@ -252,11 +254,11 @@ idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
else
memcpy(ent.name, buf1, sizeof(ent.name));
error = -ENOMEM;
- res = idtoname_update(&ent, res);
+ res = idtoname_update(cd, &ent, res);
if (res == NULL)
goto out;
- cache_put(&res->h, &idtoname_cache);
+ cache_put(&res->h, cd);
error = 0;
out:
@@ -267,10 +269,9 @@ out:
static struct ent *
-idtoname_lookup(struct ent *item)
+idtoname_lookup(struct cache_detail *cd, struct ent *item)
{
- struct cache_head *ch = sunrpc_cache_lookup(&idtoname_cache,
- &item->h,
+ struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
idtoname_hash(item));
if (ch)
return container_of(ch, struct ent, h);
@@ -279,10 +280,9 @@ idtoname_lookup(struct ent *item)
}
static struct ent *
-idtoname_update(struct ent *new, struct ent *old)
+idtoname_update(struct cache_detail *cd, struct ent *new, struct ent *old)
{
- struct cache_head *ch = sunrpc_cache_update(&idtoname_cache,
- &new->h, &old->h,
+ struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
idtoname_hash(new));
if (ch)
return container_of(ch, struct ent, h);
@@ -295,8 +295,6 @@ idtoname_update(struct ent *new, struct ent *old)
* Name -> ID cache
*/
-static struct cache_head *nametoid_table[ENT_HASHMAX];
-
static inline int
nametoid_hash(struct ent *ent)
{
@@ -317,12 +315,6 @@ nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
}
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);
@@ -351,17 +343,17 @@ nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
return 0;
}
-static struct ent *nametoid_lookup(struct ent *);
-static struct ent *nametoid_update(struct ent *, struct ent *);
+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 = {
+static struct cache_detail nametoid_cache_template = {
.owner = THIS_MODULE,
.hash_size = ENT_HASHMAX,
- .hash_table = nametoid_table,
.name = "nfs4.nametoid",
.cache_put = ent_put,
- .cache_upcall = nametoid_upcall,
+ .cache_request = nametoid_request,
.cache_parse = nametoid_parse,
.cache_show = nametoid_show,
.warn_no_listener = warn_no_idmapd,
@@ -418,14 +410,14 @@ nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
set_bit(CACHE_NEGATIVE, &ent.h.flags);
error = -ENOMEM;
- res = nametoid_lookup(&ent);
+ res = nametoid_lookup(cd, &ent);
if (res == NULL)
goto out;
- res = nametoid_update(&ent, res);
+ res = nametoid_update(cd, &ent, res);
if (res == NULL)
goto out;
- cache_put(&res->h, &nametoid_cache);
+ cache_put(&res->h, cd);
error = 0;
out:
kfree(buf1);
@@ -435,10 +427,9 @@ out:
static struct ent *
-nametoid_lookup(struct ent *item)
+nametoid_lookup(struct cache_detail *cd, struct ent *item)
{
- struct cache_head *ch = sunrpc_cache_lookup(&nametoid_cache,
- &item->h,
+ struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
nametoid_hash(item));
if (ch)
return container_of(ch, struct ent, h);
@@ -447,10 +438,9 @@ nametoid_lookup(struct ent *item)
}
static struct ent *
-nametoid_update(struct ent *new, struct ent *old)
+nametoid_update(struct cache_detail *cd, struct ent *new, struct ent *old)
{
- struct cache_head *ch = sunrpc_cache_update(&nametoid_cache,
- &new->h, &old->h,
+ struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
nametoid_hash(new));
if (ch)
return container_of(ch, struct ent, h);
@@ -463,34 +453,55 @@ nametoid_update(struct ent *new, struct ent *old)
*/
int
-nfsd_idmap_init(void)
+nfsd_idmap_init(struct net *net)
{
int rv;
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- rv = cache_register_net(&idtoname_cache, &init_net);
+ 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)
- return rv;
- rv = cache_register_net(&nametoid_cache, &init_net);
+ 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)
- cache_unregister_net(&idtoname_cache, &init_net);
+ 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(void)
+nfsd_idmap_shutdown(struct net *net)
{
- cache_unregister_net(&idtoname_cache, &init_net);
- cache_unregister_net(&nametoid_cache, &init_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 ent *), struct ent *key,
- struct cache_detail *detail, struct ent **item)
+ struct ent *(*lookup_fn)(struct cache_detail *, struct ent *),
+ struct ent *key, struct cache_detail *detail, struct ent **item)
{
int ret;
- *item = lookup_fn(key);
+ *item = lookup_fn(detail, key);
if (!*item)
return -ENOMEM;
retry:
@@ -498,7 +509,7 @@ idmap_lookup(struct svc_rqst *rqstp,
if (ret == -ETIMEDOUT) {
struct ent *prev_item = *item;
- *item = lookup_fn(key);
+ *item = lookup_fn(detail, key);
if (*item != prev_item)
goto retry;
cache_put(&(*item)->h, detail);
@@ -517,72 +528,143 @@ rqst_authname(struct svc_rqst *rqstp)
static __be32
idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen,
- uid_t *id)
+ 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, &nametoid_cache, &item);
+ 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, &nametoid_cache);
+ 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)
+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, &idtoname_cache, &item);
+ ret = idmap_lookup(rqstp, idtoname_lookup, &key, nn->idtoname_cache, &item);
if (ret == -ENOENT)
- return sprintf(name, "%u", id);
+ return encode_ascii_id(xdr, id);
if (ret)
- return ret;
+ return nfserrno(ret);
ret = strlen(item->name);
- BUG_ON(ret > IDMAP_NAMESZ);
- memcpy(name, item->name, ret);
- cache_put(&item->h, &idtoname_cache);
- return ret;
+ 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,
- __u32 *id)
+ kuid_t *uid)
{
- return idmap_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, id);
+ __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,
- __u32 *id)
+ kgid_t *gid)
{
- return idmap_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, id);
+ __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;
}
-int
-nfsd_map_uid_to_name(struct svc_rqst *rqstp, __u32 id, char *name)
+__be32 nfsd4_encode_user(struct xdr_stream *xdr, struct svc_rqst *rqstp,
+ kuid_t uid)
{
- return idmap_id_to_name(rqstp, IDMAP_TYPE_USER, id, name);
+ u32 id = from_kuid(&init_user_ns, uid);
+ return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_USER, id);
}
-int
-nfsd_map_gid_to_name(struct svc_rqst *rqstp, __u32 id, char *name)
+__be32 nfsd4_encode_group(struct xdr_stream *xdr, struct svc_rqst *rqstp,
+ kgid_t gid)
{
- return idmap_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name);
+ u32 id = from_kgid(&init_user_ns, gid);
+ return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_GROUP, id);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 12:06:57 +0000