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fac1e8e4ef
Otherwise we break backwards compatibility when v4 becomes a modules. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
823 lines
20 KiB
C
823 lines
20 KiB
C
/*
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* fs/nfs/idmap.c
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*
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* UID and GID to name mapping for clients.
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*
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* Copyright (c) 2002 The Regents of the University of Michigan.
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* All rights reserved.
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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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* notice, this list of conditions and the following disclaimer in the
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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/types.h>
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#include <linux/parser.h>
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#include <linux/fs.h>
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#include <linux/nfs_idmap.h>
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#include <net/net_namespace.h>
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#include <linux/sunrpc/rpc_pipe_fs.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_fs_sb.h>
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#include <linux/key.h>
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#include <linux/keyctl.h>
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#include <linux/key-type.h>
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#include <keys/user-type.h>
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#include <linux/module.h>
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#include "internal.h"
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#include "netns.h"
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#define NFS_UINT_MAXLEN 11
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static const struct cred *id_resolver_cache;
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static struct key_type key_type_id_resolver_legacy;
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struct idmap {
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struct rpc_pipe *idmap_pipe;
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struct key_construction *idmap_key_cons;
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struct mutex idmap_mutex;
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};
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/**
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* nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields
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* @fattr: fully initialised struct nfs_fattr
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* @owner_name: owner name string cache
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* @group_name: group name string cache
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*/
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void nfs_fattr_init_names(struct nfs_fattr *fattr,
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struct nfs4_string *owner_name,
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struct nfs4_string *group_name)
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{
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fattr->owner_name = owner_name;
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fattr->group_name = group_name;
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}
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static void nfs_fattr_free_owner_name(struct nfs_fattr *fattr)
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{
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fattr->valid &= ~NFS_ATTR_FATTR_OWNER_NAME;
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kfree(fattr->owner_name->data);
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}
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static void nfs_fattr_free_group_name(struct nfs_fattr *fattr)
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{
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fattr->valid &= ~NFS_ATTR_FATTR_GROUP_NAME;
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kfree(fattr->group_name->data);
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}
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static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr)
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{
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struct nfs4_string *owner = fattr->owner_name;
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__u32 uid;
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if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME))
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return false;
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if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) {
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fattr->uid = uid;
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fattr->valid |= NFS_ATTR_FATTR_OWNER;
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}
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return true;
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}
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static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr)
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{
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struct nfs4_string *group = fattr->group_name;
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__u32 gid;
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if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME))
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return false;
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if (nfs_map_group_to_gid(server, group->data, group->len, &gid) == 0) {
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fattr->gid = gid;
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fattr->valid |= NFS_ATTR_FATTR_GROUP;
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}
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return true;
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}
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/**
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* nfs_fattr_free_names - free up the NFSv4 owner and group strings
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* @fattr: a fully initialised nfs_fattr structure
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*/
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void nfs_fattr_free_names(struct nfs_fattr *fattr)
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{
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if (fattr->valid & NFS_ATTR_FATTR_OWNER_NAME)
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nfs_fattr_free_owner_name(fattr);
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if (fattr->valid & NFS_ATTR_FATTR_GROUP_NAME)
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nfs_fattr_free_group_name(fattr);
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}
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/**
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* nfs_fattr_map_and_free_names - map owner/group strings into uid/gid and free
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* @server: pointer to the filesystem nfs_server structure
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* @fattr: a fully initialised nfs_fattr structure
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*
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* This helper maps the cached NFSv4 owner/group strings in fattr into
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* their numeric uid/gid equivalents, and then frees the cached strings.
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*/
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void nfs_fattr_map_and_free_names(struct nfs_server *server, struct nfs_fattr *fattr)
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{
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if (nfs_fattr_map_owner_name(server, fattr))
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nfs_fattr_free_owner_name(fattr);
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if (nfs_fattr_map_group_name(server, fattr))
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nfs_fattr_free_group_name(fattr);
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}
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static int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res)
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{
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unsigned long val;
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char buf[16];
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if (memchr(name, '@', namelen) != NULL || namelen >= sizeof(buf))
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return 0;
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memcpy(buf, name, namelen);
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buf[namelen] = '\0';
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if (strict_strtoul(buf, 0, &val) != 0)
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return 0;
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*res = val;
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return 1;
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}
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static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen)
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{
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return snprintf(buf, buflen, "%u", id);
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}
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static struct key_type key_type_id_resolver = {
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.name = "id_resolver",
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.instantiate = user_instantiate,
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.match = user_match,
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.revoke = user_revoke,
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.destroy = user_destroy,
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.describe = user_describe,
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.read = user_read,
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};
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static int nfs_idmap_init_keyring(void)
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{
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struct cred *cred;
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struct key *keyring;
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int ret = 0;
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printk(KERN_NOTICE "NFS: Registering the %s key type\n",
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key_type_id_resolver.name);
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cred = prepare_kernel_cred(NULL);
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if (!cred)
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return -ENOMEM;
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keyring = key_alloc(&key_type_keyring, ".id_resolver", 0, 0, cred,
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(KEY_POS_ALL & ~KEY_POS_SETATTR) |
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KEY_USR_VIEW | KEY_USR_READ,
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KEY_ALLOC_NOT_IN_QUOTA);
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if (IS_ERR(keyring)) {
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ret = PTR_ERR(keyring);
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goto failed_put_cred;
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}
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ret = key_instantiate_and_link(keyring, NULL, 0, NULL, NULL);
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if (ret < 0)
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goto failed_put_key;
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ret = register_key_type(&key_type_id_resolver);
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if (ret < 0)
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goto failed_put_key;
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ret = register_key_type(&key_type_id_resolver_legacy);
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if (ret < 0)
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goto failed_reg_legacy;
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set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags);
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cred->thread_keyring = keyring;
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cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING;
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id_resolver_cache = cred;
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return 0;
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failed_reg_legacy:
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unregister_key_type(&key_type_id_resolver);
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failed_put_key:
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key_put(keyring);
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failed_put_cred:
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put_cred(cred);
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return ret;
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}
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static void nfs_idmap_quit_keyring(void)
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{
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key_revoke(id_resolver_cache->thread_keyring);
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unregister_key_type(&key_type_id_resolver);
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unregister_key_type(&key_type_id_resolver_legacy);
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put_cred(id_resolver_cache);
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}
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/*
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* Assemble the description to pass to request_key()
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* This function will allocate a new string and update dest to point
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* at it. The caller is responsible for freeing dest.
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*
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* On error 0 is returned. Otherwise, the length of dest is returned.
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*/
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static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen,
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const char *type, size_t typelen, char **desc)
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{
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char *cp;
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size_t desclen = typelen + namelen + 2;
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*desc = kmalloc(desclen, GFP_KERNEL);
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if (!*desc)
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return -ENOMEM;
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cp = *desc;
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memcpy(cp, type, typelen);
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cp += typelen;
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*cp++ = ':';
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memcpy(cp, name, namelen);
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cp += namelen;
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*cp = '\0';
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return desclen;
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}
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static ssize_t nfs_idmap_request_key(struct key_type *key_type,
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const char *name, size_t namelen,
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const char *type, void *data,
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size_t data_size, struct idmap *idmap)
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{
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const struct cred *saved_cred;
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struct key *rkey;
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char *desc;
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struct user_key_payload *payload;
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ssize_t ret;
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ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc);
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if (ret <= 0)
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goto out;
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saved_cred = override_creds(id_resolver_cache);
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if (idmap)
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rkey = request_key_with_auxdata(key_type, desc, "", 0, idmap);
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else
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rkey = request_key(&key_type_id_resolver, desc, "");
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revert_creds(saved_cred);
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kfree(desc);
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if (IS_ERR(rkey)) {
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ret = PTR_ERR(rkey);
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goto out;
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}
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rcu_read_lock();
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rkey->perm |= KEY_USR_VIEW;
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ret = key_validate(rkey);
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if (ret < 0)
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goto out_up;
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payload = rcu_dereference(rkey->payload.data);
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if (IS_ERR_OR_NULL(payload)) {
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ret = PTR_ERR(payload);
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goto out_up;
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}
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ret = payload->datalen;
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if (ret > 0 && ret <= data_size)
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memcpy(data, payload->data, ret);
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else
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ret = -EINVAL;
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out_up:
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rcu_read_unlock();
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key_put(rkey);
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out:
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return ret;
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}
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static ssize_t nfs_idmap_get_key(const char *name, size_t namelen,
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const char *type, void *data,
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size_t data_size, struct idmap *idmap)
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{
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ssize_t ret = nfs_idmap_request_key(&key_type_id_resolver,
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name, namelen, type, data,
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data_size, NULL);
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if (ret < 0) {
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mutex_lock(&idmap->idmap_mutex);
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ret = nfs_idmap_request_key(&key_type_id_resolver_legacy,
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name, namelen, type, data,
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data_size, idmap);
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mutex_unlock(&idmap->idmap_mutex);
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}
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return ret;
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}
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/* ID -> Name */
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static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf,
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size_t buflen, struct idmap *idmap)
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{
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char id_str[NFS_UINT_MAXLEN];
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int id_len;
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ssize_t ret;
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id_len = snprintf(id_str, sizeof(id_str), "%u", id);
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ret = nfs_idmap_get_key(id_str, id_len, type, buf, buflen, idmap);
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if (ret < 0)
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return -EINVAL;
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return ret;
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}
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/* Name -> ID */
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static int nfs_idmap_lookup_id(const char *name, size_t namelen, const char *type,
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__u32 *id, struct idmap *idmap)
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{
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char id_str[NFS_UINT_MAXLEN];
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long id_long;
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ssize_t data_size;
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int ret = 0;
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data_size = nfs_idmap_get_key(name, namelen, type, id_str, NFS_UINT_MAXLEN, idmap);
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if (data_size <= 0) {
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ret = -EINVAL;
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} else {
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ret = strict_strtol(id_str, 10, &id_long);
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*id = (__u32)id_long;
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}
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return ret;
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}
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/* idmap classic begins here */
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enum {
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Opt_find_uid, Opt_find_gid, Opt_find_user, Opt_find_group, Opt_find_err
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};
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static const match_table_t nfs_idmap_tokens = {
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{ Opt_find_uid, "uid:%s" },
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{ Opt_find_gid, "gid:%s" },
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{ Opt_find_user, "user:%s" },
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{ Opt_find_group, "group:%s" },
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{ Opt_find_err, NULL }
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};
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|
|
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static int nfs_idmap_legacy_upcall(struct key_construction *, const char *, void *);
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static ssize_t idmap_pipe_downcall(struct file *, const char __user *,
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size_t);
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static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *);
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|
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static const struct rpc_pipe_ops idmap_upcall_ops = {
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.upcall = rpc_pipe_generic_upcall,
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.downcall = idmap_pipe_downcall,
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.destroy_msg = idmap_pipe_destroy_msg,
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};
|
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|
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static struct key_type key_type_id_resolver_legacy = {
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.name = "id_legacy",
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.instantiate = user_instantiate,
|
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.match = user_match,
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.revoke = user_revoke,
|
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.destroy = user_destroy,
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.describe = user_describe,
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.read = user_read,
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.request_key = nfs_idmap_legacy_upcall,
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};
|
|
|
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static void __nfs_idmap_unregister(struct rpc_pipe *pipe)
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{
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if (pipe->dentry)
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rpc_unlink(pipe->dentry);
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}
|
|
|
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static int __nfs_idmap_register(struct dentry *dir,
|
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struct idmap *idmap,
|
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struct rpc_pipe *pipe)
|
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{
|
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struct dentry *dentry;
|
|
|
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dentry = rpc_mkpipe_dentry(dir, "idmap", idmap, pipe);
|
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if (IS_ERR(dentry))
|
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return PTR_ERR(dentry);
|
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pipe->dentry = dentry;
|
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return 0;
|
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}
|
|
|
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static void nfs_idmap_unregister(struct nfs_client *clp,
|
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struct rpc_pipe *pipe)
|
|
{
|
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struct net *net = clp->cl_net;
|
|
struct super_block *pipefs_sb;
|
|
|
|
pipefs_sb = rpc_get_sb_net(net);
|
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if (pipefs_sb) {
|
|
__nfs_idmap_unregister(pipe);
|
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rpc_put_sb_net(net);
|
|
}
|
|
}
|
|
|
|
static int nfs_idmap_register(struct nfs_client *clp,
|
|
struct idmap *idmap,
|
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struct rpc_pipe *pipe)
|
|
{
|
|
struct net *net = clp->cl_net;
|
|
struct super_block *pipefs_sb;
|
|
int err = 0;
|
|
|
|
pipefs_sb = rpc_get_sb_net(net);
|
|
if (pipefs_sb) {
|
|
if (clp->cl_rpcclient->cl_dentry)
|
|
err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry,
|
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idmap, pipe);
|
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rpc_put_sb_net(net);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int
|
|
nfs_idmap_new(struct nfs_client *clp)
|
|
{
|
|
struct idmap *idmap;
|
|
struct rpc_pipe *pipe;
|
|
int error;
|
|
|
|
BUG_ON(clp->cl_idmap != NULL);
|
|
|
|
idmap = kzalloc(sizeof(*idmap), GFP_KERNEL);
|
|
if (idmap == NULL)
|
|
return -ENOMEM;
|
|
|
|
pipe = rpc_mkpipe_data(&idmap_upcall_ops, 0);
|
|
if (IS_ERR(pipe)) {
|
|
error = PTR_ERR(pipe);
|
|
kfree(idmap);
|
|
return error;
|
|
}
|
|
error = nfs_idmap_register(clp, idmap, pipe);
|
|
if (error) {
|
|
rpc_destroy_pipe_data(pipe);
|
|
kfree(idmap);
|
|
return error;
|
|
}
|
|
idmap->idmap_pipe = pipe;
|
|
mutex_init(&idmap->idmap_mutex);
|
|
|
|
clp->cl_idmap = idmap;
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
nfs_idmap_delete(struct nfs_client *clp)
|
|
{
|
|
struct idmap *idmap = clp->cl_idmap;
|
|
|
|
if (!idmap)
|
|
return;
|
|
nfs_idmap_unregister(clp, idmap->idmap_pipe);
|
|
rpc_destroy_pipe_data(idmap->idmap_pipe);
|
|
clp->cl_idmap = NULL;
|
|
kfree(idmap);
|
|
}
|
|
|
|
static int __rpc_pipefs_event(struct nfs_client *clp, unsigned long event,
|
|
struct super_block *sb)
|
|
{
|
|
int err = 0;
|
|
|
|
switch (event) {
|
|
case RPC_PIPEFS_MOUNT:
|
|
BUG_ON(clp->cl_rpcclient->cl_dentry == NULL);
|
|
err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry,
|
|
clp->cl_idmap,
|
|
clp->cl_idmap->idmap_pipe);
|
|
break;
|
|
case RPC_PIPEFS_UMOUNT:
|
|
if (clp->cl_idmap->idmap_pipe) {
|
|
struct dentry *parent;
|
|
|
|
parent = clp->cl_idmap->idmap_pipe->dentry->d_parent;
|
|
__nfs_idmap_unregister(clp->cl_idmap->idmap_pipe);
|
|
/*
|
|
* Note: This is a dirty hack. SUNRPC hook has been
|
|
* called already but simple_rmdir() call for the
|
|
* directory returned with error because of idmap pipe
|
|
* inside. Thus now we have to remove this directory
|
|
* here.
|
|
*/
|
|
if (rpc_rmdir(parent))
|
|
printk(KERN_ERR "NFS: %s: failed to remove "
|
|
"clnt dir!\n", __func__);
|
|
}
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "NFS: %s: unknown event: %ld\n", __func__,
|
|
event);
|
|
return -ENOTSUPP;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static struct nfs_client *nfs_get_client_for_event(struct net *net, int event)
|
|
{
|
|
struct nfs_net *nn = net_generic(net, nfs_net_id);
|
|
struct dentry *cl_dentry;
|
|
struct nfs_client *clp;
|
|
int err;
|
|
|
|
restart:
|
|
spin_lock(&nn->nfs_client_lock);
|
|
list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
|
|
/* Wait for initialisation to finish */
|
|
if (clp->cl_cons_state == NFS_CS_INITING) {
|
|
atomic_inc(&clp->cl_count);
|
|
spin_unlock(&nn->nfs_client_lock);
|
|
err = nfs_wait_client_init_complete(clp);
|
|
nfs_put_client(clp);
|
|
if (err)
|
|
return NULL;
|
|
goto restart;
|
|
}
|
|
/* Skip nfs_clients that failed to initialise */
|
|
if (clp->cl_cons_state < 0)
|
|
continue;
|
|
smp_rmb();
|
|
if (clp->rpc_ops != &nfs_v4_clientops)
|
|
continue;
|
|
cl_dentry = clp->cl_idmap->idmap_pipe->dentry;
|
|
if (((event == RPC_PIPEFS_MOUNT) && cl_dentry) ||
|
|
((event == RPC_PIPEFS_UMOUNT) && !cl_dentry))
|
|
continue;
|
|
atomic_inc(&clp->cl_count);
|
|
spin_unlock(&nn->nfs_client_lock);
|
|
return clp;
|
|
}
|
|
spin_unlock(&nn->nfs_client_lock);
|
|
return NULL;
|
|
}
|
|
|
|
static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
|
|
void *ptr)
|
|
{
|
|
struct super_block *sb = ptr;
|
|
struct nfs_client *clp;
|
|
int error = 0;
|
|
|
|
if (!try_module_get(THIS_MODULE))
|
|
return 0;
|
|
|
|
while ((clp = nfs_get_client_for_event(sb->s_fs_info, event))) {
|
|
error = __rpc_pipefs_event(clp, event, sb);
|
|
nfs_put_client(clp);
|
|
if (error)
|
|
break;
|
|
}
|
|
module_put(THIS_MODULE);
|
|
return error;
|
|
}
|
|
|
|
#define PIPEFS_NFS_PRIO 1
|
|
|
|
static struct notifier_block nfs_idmap_block = {
|
|
.notifier_call = rpc_pipefs_event,
|
|
.priority = SUNRPC_PIPEFS_NFS_PRIO,
|
|
};
|
|
|
|
int nfs_idmap_init(void)
|
|
{
|
|
int ret;
|
|
ret = nfs_idmap_init_keyring();
|
|
if (ret != 0)
|
|
goto out;
|
|
ret = rpc_pipefs_notifier_register(&nfs_idmap_block);
|
|
if (ret != 0)
|
|
nfs_idmap_quit_keyring();
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
void nfs_idmap_quit(void)
|
|
{
|
|
rpc_pipefs_notifier_unregister(&nfs_idmap_block);
|
|
nfs_idmap_quit_keyring();
|
|
}
|
|
|
|
static int nfs_idmap_prepare_message(char *desc, struct idmap_msg *im,
|
|
struct rpc_pipe_msg *msg)
|
|
{
|
|
substring_t substr;
|
|
int token, ret;
|
|
|
|
memset(im, 0, sizeof(*im));
|
|
memset(msg, 0, sizeof(*msg));
|
|
|
|
im->im_type = IDMAP_TYPE_GROUP;
|
|
token = match_token(desc, nfs_idmap_tokens, &substr);
|
|
|
|
switch (token) {
|
|
case Opt_find_uid:
|
|
im->im_type = IDMAP_TYPE_USER;
|
|
case Opt_find_gid:
|
|
im->im_conv = IDMAP_CONV_NAMETOID;
|
|
ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ);
|
|
break;
|
|
|
|
case Opt_find_user:
|
|
im->im_type = IDMAP_TYPE_USER;
|
|
case Opt_find_group:
|
|
im->im_conv = IDMAP_CONV_IDTONAME;
|
|
ret = match_int(&substr, &im->im_id);
|
|
break;
|
|
|
|
default:
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
msg->data = im;
|
|
msg->len = sizeof(struct idmap_msg);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int nfs_idmap_legacy_upcall(struct key_construction *cons,
|
|
const char *op,
|
|
void *aux)
|
|
{
|
|
struct rpc_pipe_msg *msg;
|
|
struct idmap_msg *im;
|
|
struct idmap *idmap = (struct idmap *)aux;
|
|
struct key *key = cons->key;
|
|
int ret = -ENOMEM;
|
|
|
|
/* msg and im are freed in idmap_pipe_destroy_msg */
|
|
msg = kmalloc(sizeof(*msg), GFP_KERNEL);
|
|
if (!msg)
|
|
goto out0;
|
|
|
|
im = kmalloc(sizeof(*im), GFP_KERNEL);
|
|
if (!im)
|
|
goto out1;
|
|
|
|
ret = nfs_idmap_prepare_message(key->description, im, msg);
|
|
if (ret < 0)
|
|
goto out2;
|
|
|
|
BUG_ON(idmap->idmap_key_cons != NULL);
|
|
idmap->idmap_key_cons = cons;
|
|
|
|
ret = rpc_queue_upcall(idmap->idmap_pipe, msg);
|
|
if (ret < 0)
|
|
goto out2;
|
|
|
|
return ret;
|
|
|
|
out2:
|
|
kfree(im);
|
|
out1:
|
|
kfree(msg);
|
|
out0:
|
|
complete_request_key(cons, ret);
|
|
return ret;
|
|
}
|
|
|
|
static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data)
|
|
{
|
|
return key_instantiate_and_link(key, data, strlen(data) + 1,
|
|
id_resolver_cache->thread_keyring,
|
|
authkey);
|
|
}
|
|
|
|
static int nfs_idmap_read_message(struct idmap_msg *im, struct key *key, struct key *authkey)
|
|
{
|
|
char id_str[NFS_UINT_MAXLEN];
|
|
int ret = -EINVAL;
|
|
|
|
switch (im->im_conv) {
|
|
case IDMAP_CONV_NAMETOID:
|
|
sprintf(id_str, "%d", im->im_id);
|
|
ret = nfs_idmap_instantiate(key, authkey, id_str);
|
|
break;
|
|
case IDMAP_CONV_IDTONAME:
|
|
ret = nfs_idmap_instantiate(key, authkey, im->im_name);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t
|
|
idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
|
|
{
|
|
struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode);
|
|
struct idmap *idmap = (struct idmap *)rpci->private;
|
|
struct key_construction *cons;
|
|
struct idmap_msg im;
|
|
size_t namelen_in;
|
|
int ret;
|
|
|
|
/* If instantiation is successful, anyone waiting for key construction
|
|
* will have been woken up and someone else may now have used
|
|
* idmap_key_cons - so after this point we may no longer touch it.
|
|
*/
|
|
cons = ACCESS_ONCE(idmap->idmap_key_cons);
|
|
idmap->idmap_key_cons = NULL;
|
|
|
|
if (mlen != sizeof(im)) {
|
|
ret = -ENOSPC;
|
|
goto out;
|
|
}
|
|
|
|
if (copy_from_user(&im, src, mlen) != 0) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
if (!(im.im_status & IDMAP_STATUS_SUCCESS)) {
|
|
ret = mlen;
|
|
complete_request_key(cons, -ENOKEY);
|
|
goto out_incomplete;
|
|
}
|
|
|
|
namelen_in = strnlen(im.im_name, IDMAP_NAMESZ);
|
|
if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
ret = nfs_idmap_read_message(&im, cons->key, cons->authkey);
|
|
if (ret >= 0) {
|
|
key_set_timeout(cons->key, nfs_idmap_cache_timeout);
|
|
ret = mlen;
|
|
}
|
|
|
|
out:
|
|
complete_request_key(cons, ret);
|
|
out_incomplete:
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg)
|
|
{
|
|
/* Free memory allocated in nfs_idmap_legacy_upcall() */
|
|
kfree(msg->data);
|
|
kfree(msg);
|
|
}
|
|
|
|
int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid)
|
|
{
|
|
struct idmap *idmap = server->nfs_client->cl_idmap;
|
|
|
|
if (nfs_map_string_to_numeric(name, namelen, uid))
|
|
return 0;
|
|
return nfs_idmap_lookup_id(name, namelen, "uid", uid, idmap);
|
|
}
|
|
|
|
int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *gid)
|
|
{
|
|
struct idmap *idmap = server->nfs_client->cl_idmap;
|
|
|
|
if (nfs_map_string_to_numeric(name, namelen, gid))
|
|
return 0;
|
|
return nfs_idmap_lookup_id(name, namelen, "gid", gid, idmap);
|
|
}
|
|
|
|
int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen)
|
|
{
|
|
struct idmap *idmap = server->nfs_client->cl_idmap;
|
|
int ret = -EINVAL;
|
|
|
|
if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
|
|
ret = nfs_idmap_lookup_name(uid, "user", buf, buflen, idmap);
|
|
if (ret < 0)
|
|
ret = nfs_map_numeric_to_string(uid, buf, buflen);
|
|
return ret;
|
|
}
|
|
int nfs_map_gid_to_group(const struct nfs_server *server, __u32 gid, char *buf, size_t buflen)
|
|
{
|
|
struct idmap *idmap = server->nfs_client->cl_idmap;
|
|
int ret = -EINVAL;
|
|
|
|
if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
|
|
ret = nfs_idmap_lookup_name(gid, "group", buf, buflen, idmap);
|
|
if (ret < 0)
|
|
ret = nfs_map_numeric_to_string(gid, buf, buflen);
|
|
return ret;
|
|
}
|