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79caa5fad4
When converting kuids to AUTH_UNIX creds, etc we will want to use the same user namespace as the process that created the rpc client. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
542 lines
12 KiB
C
542 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* In-kernel MOUNT protocol client
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*
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* Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/uio.h>
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#include <linux/net.h>
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#include <linux/in.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/nfs_fs.h>
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#include "internal.h"
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#define NFSDBG_FACILITY NFSDBG_MOUNT
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/*
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* Defined by RFC 1094, section A.3; and RFC 1813, section 5.1.4
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*/
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#define MNTPATHLEN (1024)
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/*
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* XDR data type sizes
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*/
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#define encode_dirpath_sz (1 + XDR_QUADLEN(MNTPATHLEN))
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#define MNT_status_sz (1)
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#define MNT_fhs_status_sz (1)
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#define MNT_fhandle_sz XDR_QUADLEN(NFS2_FHSIZE)
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#define MNT_fhandle3_sz (1 + XDR_QUADLEN(NFS3_FHSIZE))
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#define MNT_authflav3_sz (1 + NFS_MAX_SECFLAVORS)
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/*
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* XDR argument and result sizes
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*/
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#define MNT_enc_dirpath_sz encode_dirpath_sz
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#define MNT_dec_mountres_sz (MNT_status_sz + MNT_fhandle_sz)
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#define MNT_dec_mountres3_sz (MNT_status_sz + MNT_fhandle_sz + \
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MNT_authflav3_sz)
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/*
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* Defined by RFC 1094, section A.5
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*/
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enum {
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MOUNTPROC_NULL = 0,
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MOUNTPROC_MNT = 1,
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MOUNTPROC_DUMP = 2,
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MOUNTPROC_UMNT = 3,
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MOUNTPROC_UMNTALL = 4,
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MOUNTPROC_EXPORT = 5,
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};
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/*
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* Defined by RFC 1813, section 5.2
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*/
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enum {
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MOUNTPROC3_NULL = 0,
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MOUNTPROC3_MNT = 1,
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MOUNTPROC3_DUMP = 2,
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MOUNTPROC3_UMNT = 3,
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MOUNTPROC3_UMNTALL = 4,
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MOUNTPROC3_EXPORT = 5,
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};
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static const struct rpc_program mnt_program;
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/*
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* Defined by OpenGroup XNFS Version 3W, chapter 8
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*/
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enum mountstat {
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MNT_OK = 0,
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MNT_EPERM = 1,
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MNT_ENOENT = 2,
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MNT_EACCES = 13,
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MNT_EINVAL = 22,
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};
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static struct {
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u32 status;
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int errno;
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} mnt_errtbl[] = {
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{ .status = MNT_OK, .errno = 0, },
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{ .status = MNT_EPERM, .errno = -EPERM, },
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{ .status = MNT_ENOENT, .errno = -ENOENT, },
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{ .status = MNT_EACCES, .errno = -EACCES, },
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{ .status = MNT_EINVAL, .errno = -EINVAL, },
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};
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/*
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* Defined by RFC 1813, section 5.1.5
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*/
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enum mountstat3 {
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MNT3_OK = 0, /* no error */
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MNT3ERR_PERM = 1, /* Not owner */
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MNT3ERR_NOENT = 2, /* No such file or directory */
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MNT3ERR_IO = 5, /* I/O error */
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MNT3ERR_ACCES = 13, /* Permission denied */
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MNT3ERR_NOTDIR = 20, /* Not a directory */
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MNT3ERR_INVAL = 22, /* Invalid argument */
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MNT3ERR_NAMETOOLONG = 63, /* Filename too long */
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MNT3ERR_NOTSUPP = 10004, /* Operation not supported */
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MNT3ERR_SERVERFAULT = 10006, /* A failure on the server */
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};
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static struct {
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u32 status;
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int errno;
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} mnt3_errtbl[] = {
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{ .status = MNT3_OK, .errno = 0, },
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{ .status = MNT3ERR_PERM, .errno = -EPERM, },
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{ .status = MNT3ERR_NOENT, .errno = -ENOENT, },
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{ .status = MNT3ERR_IO, .errno = -EIO, },
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{ .status = MNT3ERR_ACCES, .errno = -EACCES, },
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{ .status = MNT3ERR_NOTDIR, .errno = -ENOTDIR, },
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{ .status = MNT3ERR_INVAL, .errno = -EINVAL, },
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{ .status = MNT3ERR_NAMETOOLONG, .errno = -ENAMETOOLONG, },
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{ .status = MNT3ERR_NOTSUPP, .errno = -ENOTSUPP, },
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{ .status = MNT3ERR_SERVERFAULT, .errno = -EREMOTEIO, },
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};
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struct mountres {
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int errno;
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struct nfs_fh *fh;
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unsigned int *auth_count;
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rpc_authflavor_t *auth_flavors;
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};
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struct mnt_fhstatus {
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u32 status;
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struct nfs_fh *fh;
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};
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/**
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* nfs_mount - Obtain an NFS file handle for the given host and path
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* @info: pointer to mount request arguments
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*
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* Uses default timeout parameters specified by underlying transport. On
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* successful return, the auth_flavs list and auth_flav_len will be populated
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* with the list from the server or a faked-up list if the server didn't
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* provide one.
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*/
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int nfs_mount(struct nfs_mount_request *info)
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{
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struct mountres result = {
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.fh = info->fh,
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.auth_count = info->auth_flav_len,
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.auth_flavors = info->auth_flavs,
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};
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struct rpc_message msg = {
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.rpc_argp = info->dirpath,
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.rpc_resp = &result,
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};
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struct rpc_create_args args = {
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.net = info->net,
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.protocol = info->protocol,
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.address = info->sap,
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.addrsize = info->salen,
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.servername = info->hostname,
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.program = &mnt_program,
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.version = info->version,
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.authflavor = RPC_AUTH_UNIX,
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.cred = current_cred(),
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};
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struct rpc_clnt *mnt_clnt;
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int status;
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dprintk("NFS: sending MNT request for %s:%s\n",
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(info->hostname ? info->hostname : "server"),
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info->dirpath);
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if (strlen(info->dirpath) > MNTPATHLEN)
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return -ENAMETOOLONG;
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if (info->noresvport)
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args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
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mnt_clnt = rpc_create(&args);
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if (IS_ERR(mnt_clnt))
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goto out_clnt_err;
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if (info->version == NFS_MNT3_VERSION)
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msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
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else
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msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT];
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status = rpc_call_sync(mnt_clnt, &msg, RPC_TASK_SOFT|RPC_TASK_TIMEOUT);
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rpc_shutdown_client(mnt_clnt);
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if (status < 0)
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goto out_call_err;
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if (result.errno != 0)
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goto out_mnt_err;
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dprintk("NFS: MNT request succeeded\n");
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status = 0;
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/*
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* If the server didn't provide a flavor list, allow the
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* client to try any flavor.
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*/
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if (info->version != NFS_MNT3_VERSION || *info->auth_flav_len == 0) {
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dprintk("NFS: Faking up auth_flavs list\n");
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info->auth_flavs[0] = RPC_AUTH_NULL;
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*info->auth_flav_len = 1;
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}
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out:
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return status;
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out_clnt_err:
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status = PTR_ERR(mnt_clnt);
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dprintk("NFS: failed to create MNT RPC client, status=%d\n", status);
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goto out;
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out_call_err:
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dprintk("NFS: MNT request failed, status=%d\n", status);
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goto out;
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out_mnt_err:
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dprintk("NFS: MNT server returned result %d\n", result.errno);
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status = result.errno;
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goto out;
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}
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/**
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* nfs_umount - Notify a server that we have unmounted this export
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* @info: pointer to umount request arguments
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*
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* MOUNTPROC_UMNT is advisory, so we set a short timeout, and always
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* use UDP.
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*/
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void nfs_umount(const struct nfs_mount_request *info)
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{
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static const struct rpc_timeout nfs_umnt_timeout = {
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.to_initval = 1 * HZ,
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.to_maxval = 3 * HZ,
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.to_retries = 2,
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};
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struct rpc_create_args args = {
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.net = info->net,
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.protocol = IPPROTO_UDP,
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.address = info->sap,
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.addrsize = info->salen,
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.timeout = &nfs_umnt_timeout,
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.servername = info->hostname,
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.program = &mnt_program,
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.version = info->version,
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.authflavor = RPC_AUTH_UNIX,
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.flags = RPC_CLNT_CREATE_NOPING,
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.cred = current_cred(),
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};
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struct rpc_message msg = {
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.rpc_argp = info->dirpath,
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};
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struct rpc_clnt *clnt;
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int status;
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if (strlen(info->dirpath) > MNTPATHLEN)
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return;
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if (info->noresvport)
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args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
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clnt = rpc_create(&args);
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if (IS_ERR(clnt))
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goto out_clnt_err;
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dprintk("NFS: sending UMNT request for %s:%s\n",
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(info->hostname ? info->hostname : "server"), info->dirpath);
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if (info->version == NFS_MNT3_VERSION)
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msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC3_UMNT];
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else
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msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC_UMNT];
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status = rpc_call_sync(clnt, &msg, 0);
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rpc_shutdown_client(clnt);
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if (unlikely(status < 0))
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goto out_call_err;
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return;
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out_clnt_err:
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dprintk("NFS: failed to create UMNT RPC client, status=%ld\n",
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PTR_ERR(clnt));
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return;
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out_call_err:
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dprintk("NFS: UMNT request failed, status=%d\n", status);
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}
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/*
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* XDR encode/decode functions for MOUNT
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*/
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static void encode_mntdirpath(struct xdr_stream *xdr, const char *pathname)
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{
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const u32 pathname_len = strlen(pathname);
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__be32 *p;
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p = xdr_reserve_space(xdr, 4 + pathname_len);
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xdr_encode_opaque(p, pathname, pathname_len);
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}
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static void mnt_xdr_enc_dirpath(struct rpc_rqst *req, struct xdr_stream *xdr,
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const void *dirpath)
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{
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encode_mntdirpath(xdr, dirpath);
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}
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/*
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* RFC 1094: "A non-zero status indicates some sort of error. In this
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* case, the status is a UNIX error number." This can be problematic
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* if the server and client use different errno values for the same
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* error.
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*
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* However, the OpenGroup XNFS spec provides a simple mapping that is
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* independent of local errno values on the server and the client.
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*/
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static int decode_status(struct xdr_stream *xdr, struct mountres *res)
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{
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unsigned int i;
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u32 status;
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__be32 *p;
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p = xdr_inline_decode(xdr, 4);
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if (unlikely(p == NULL))
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return -EIO;
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status = be32_to_cpup(p);
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for (i = 0; i < ARRAY_SIZE(mnt_errtbl); i++) {
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if (mnt_errtbl[i].status == status) {
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res->errno = mnt_errtbl[i].errno;
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return 0;
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}
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}
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dprintk("NFS: unrecognized MNT status code: %u\n", status);
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res->errno = -EACCES;
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return 0;
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}
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static int decode_fhandle(struct xdr_stream *xdr, struct mountres *res)
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{
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struct nfs_fh *fh = res->fh;
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__be32 *p;
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p = xdr_inline_decode(xdr, NFS2_FHSIZE);
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if (unlikely(p == NULL))
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return -EIO;
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fh->size = NFS2_FHSIZE;
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memcpy(fh->data, p, NFS2_FHSIZE);
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return 0;
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}
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static int mnt_xdr_dec_mountres(struct rpc_rqst *req,
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struct xdr_stream *xdr,
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void *data)
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{
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struct mountres *res = data;
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int status;
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status = decode_status(xdr, res);
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if (unlikely(status != 0 || res->errno != 0))
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return status;
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return decode_fhandle(xdr, res);
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}
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static int decode_fhs_status(struct xdr_stream *xdr, struct mountres *res)
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{
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unsigned int i;
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u32 status;
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__be32 *p;
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p = xdr_inline_decode(xdr, 4);
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if (unlikely(p == NULL))
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return -EIO;
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status = be32_to_cpup(p);
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for (i = 0; i < ARRAY_SIZE(mnt3_errtbl); i++) {
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if (mnt3_errtbl[i].status == status) {
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res->errno = mnt3_errtbl[i].errno;
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return 0;
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}
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}
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dprintk("NFS: unrecognized MNT3 status code: %u\n", status);
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res->errno = -EACCES;
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return 0;
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}
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static int decode_fhandle3(struct xdr_stream *xdr, struct mountres *res)
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{
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struct nfs_fh *fh = res->fh;
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u32 size;
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__be32 *p;
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p = xdr_inline_decode(xdr, 4);
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if (unlikely(p == NULL))
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return -EIO;
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size = be32_to_cpup(p);
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if (size > NFS3_FHSIZE || size == 0)
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return -EIO;
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p = xdr_inline_decode(xdr, size);
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if (unlikely(p == NULL))
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return -EIO;
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fh->size = size;
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memcpy(fh->data, p, size);
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return 0;
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}
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static int decode_auth_flavors(struct xdr_stream *xdr, struct mountres *res)
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{
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rpc_authflavor_t *flavors = res->auth_flavors;
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unsigned int *count = res->auth_count;
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u32 entries, i;
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__be32 *p;
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if (*count == 0)
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return 0;
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p = xdr_inline_decode(xdr, 4);
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if (unlikely(p == NULL))
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return -EIO;
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entries = be32_to_cpup(p);
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dprintk("NFS: received %u auth flavors\n", entries);
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if (entries > NFS_MAX_SECFLAVORS)
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entries = NFS_MAX_SECFLAVORS;
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p = xdr_inline_decode(xdr, 4 * entries);
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if (unlikely(p == NULL))
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return -EIO;
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if (entries > *count)
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entries = *count;
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for (i = 0; i < entries; i++) {
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flavors[i] = be32_to_cpup(p++);
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dprintk("NFS: auth flavor[%u]: %d\n", i, flavors[i]);
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}
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*count = i;
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return 0;
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}
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static int mnt_xdr_dec_mountres3(struct rpc_rqst *req,
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struct xdr_stream *xdr,
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void *data)
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{
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struct mountres *res = data;
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int status;
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status = decode_fhs_status(xdr, res);
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if (unlikely(status != 0 || res->errno != 0))
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return status;
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status = decode_fhandle3(xdr, res);
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if (unlikely(status != 0)) {
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res->errno = -EBADHANDLE;
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return 0;
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}
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return decode_auth_flavors(xdr, res);
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}
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static const struct rpc_procinfo mnt_procedures[] = {
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[MOUNTPROC_MNT] = {
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.p_proc = MOUNTPROC_MNT,
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.p_encode = mnt_xdr_enc_dirpath,
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.p_decode = mnt_xdr_dec_mountres,
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.p_arglen = MNT_enc_dirpath_sz,
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.p_replen = MNT_dec_mountres_sz,
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.p_statidx = MOUNTPROC_MNT,
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.p_name = "MOUNT",
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},
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[MOUNTPROC_UMNT] = {
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.p_proc = MOUNTPROC_UMNT,
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.p_encode = mnt_xdr_enc_dirpath,
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.p_arglen = MNT_enc_dirpath_sz,
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.p_statidx = MOUNTPROC_UMNT,
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.p_name = "UMOUNT",
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},
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};
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static const struct rpc_procinfo mnt3_procedures[] = {
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[MOUNTPROC3_MNT] = {
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.p_proc = MOUNTPROC3_MNT,
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.p_encode = mnt_xdr_enc_dirpath,
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.p_decode = mnt_xdr_dec_mountres3,
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.p_arglen = MNT_enc_dirpath_sz,
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.p_replen = MNT_dec_mountres3_sz,
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.p_statidx = MOUNTPROC3_MNT,
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.p_name = "MOUNT",
|
|
},
|
|
[MOUNTPROC3_UMNT] = {
|
|
.p_proc = MOUNTPROC3_UMNT,
|
|
.p_encode = mnt_xdr_enc_dirpath,
|
|
.p_arglen = MNT_enc_dirpath_sz,
|
|
.p_statidx = MOUNTPROC3_UMNT,
|
|
.p_name = "UMOUNT",
|
|
},
|
|
};
|
|
|
|
static unsigned int mnt_counts[ARRAY_SIZE(mnt_procedures)];
|
|
static const struct rpc_version mnt_version1 = {
|
|
.number = 1,
|
|
.nrprocs = ARRAY_SIZE(mnt_procedures),
|
|
.procs = mnt_procedures,
|
|
.counts = mnt_counts,
|
|
};
|
|
|
|
static unsigned int mnt3_counts[ARRAY_SIZE(mnt3_procedures)];
|
|
static const struct rpc_version mnt_version3 = {
|
|
.number = 3,
|
|
.nrprocs = ARRAY_SIZE(mnt3_procedures),
|
|
.procs = mnt3_procedures,
|
|
.counts = mnt3_counts,
|
|
};
|
|
|
|
static const struct rpc_version *mnt_version[] = {
|
|
NULL,
|
|
&mnt_version1,
|
|
NULL,
|
|
&mnt_version3,
|
|
};
|
|
|
|
static struct rpc_stat mnt_stats;
|
|
|
|
static const struct rpc_program mnt_program = {
|
|
.name = "mount",
|
|
.number = NFS_MNT_PROGRAM,
|
|
.nrvers = ARRAY_SIZE(mnt_version),
|
|
.version = mnt_version,
|
|
.stats = &mnt_stats,
|
|
};
|