![Jeff Layton](/assets/img/avatar_default.png)
...just for clarity. Signed-off-by: Jeff Layton <jeff.layton@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
690 lines
18 KiB
C
690 lines
18 KiB
C
/*
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* NFS server file handle treatment.
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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* Portions Copyright (C) 1999 G. Allen Morris III <gam3@acm.org>
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* Extensive rewrite by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999
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* ... and again Southern-Winter 2001 to support export_operations
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*/
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#include <linux/exportfs.h>
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#include <linux/sunrpc/svcauth_gss.h>
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#include "nfsd.h"
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#include "vfs.h"
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#include "auth.h"
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#define NFSDDBG_FACILITY NFSDDBG_FH
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/*
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* our acceptability function.
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* if NOSUBTREECHECK, accept anything
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* if not, require that we can walk up to exp->ex_dentry
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* doing some checks on the 'x' bits
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*/
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static int nfsd_acceptable(void *expv, struct dentry *dentry)
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{
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struct svc_export *exp = expv;
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int rv;
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struct dentry *tdentry;
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struct dentry *parent;
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if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
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return 1;
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tdentry = dget(dentry);
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while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) {
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/* make sure parents give x permission to user */
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int err;
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parent = dget_parent(tdentry);
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err = inode_permission(d_inode(parent), MAY_EXEC);
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if (err < 0) {
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dput(parent);
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break;
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}
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dput(tdentry);
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tdentry = parent;
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}
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if (tdentry != exp->ex_path.dentry)
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dprintk("nfsd_acceptable failed at %p %pd\n", tdentry, tdentry);
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rv = (tdentry == exp->ex_path.dentry);
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dput(tdentry);
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return rv;
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}
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/* Type check. The correct error return for type mismatches does not seem to be
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* generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a
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* comment in the NFSv3 spec says this is incorrect (implementation notes for
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* the write call).
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*/
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static inline __be32
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nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, umode_t requested)
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{
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mode &= S_IFMT;
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if (requested == 0) /* the caller doesn't care */
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return nfs_ok;
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if (mode == requested)
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return nfs_ok;
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/*
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* v4 has an error more specific than err_notdir which we should
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* return in preference to err_notdir:
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*/
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if (rqstp->rq_vers == 4 && mode == S_IFLNK)
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return nfserr_symlink;
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if (requested == S_IFDIR)
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return nfserr_notdir;
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if (mode == S_IFDIR)
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return nfserr_isdir;
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return nfserr_inval;
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}
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static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp,
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struct svc_export *exp)
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{
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int flags = nfsexp_flags(rqstp, exp);
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/* Check if the request originated from a secure port. */
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if (!test_bit(RQ_SECURE, &rqstp->rq_flags) && !(flags & NFSEXP_INSECURE_PORT)) {
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RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
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dprintk("nfsd: request from insecure port %s!\n",
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svc_print_addr(rqstp, buf, sizeof(buf)));
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return nfserr_perm;
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}
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/* Set user creds for this exportpoint */
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return nfserrno(nfsd_setuser(rqstp, exp));
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}
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static inline __be32 check_pseudo_root(struct svc_rqst *rqstp,
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struct dentry *dentry, struct svc_export *exp)
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{
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if (!(exp->ex_flags & NFSEXP_V4ROOT))
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return nfs_ok;
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/*
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* v2/v3 clients have no need for the V4ROOT export--they use
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* the mount protocl instead; also, further V4ROOT checks may be
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* in v4-specific code, in which case v2/v3 clients could bypass
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* them.
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*/
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if (!nfsd_v4client(rqstp))
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return nfserr_stale;
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/*
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* We're exposing only the directories and symlinks that have to be
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* traversed on the way to real exports:
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*/
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if (unlikely(!d_is_dir(dentry) &&
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!d_is_symlink(dentry)))
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return nfserr_stale;
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/*
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* A pseudoroot export gives permission to access only one
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* single directory; the kernel has to make another upcall
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* before granting access to anything else under it:
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*/
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if (unlikely(dentry != exp->ex_path.dentry))
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return nfserr_stale;
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return nfs_ok;
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}
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/*
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* Use the given filehandle to look up the corresponding export and
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* dentry. On success, the results are used to set fh_export and
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* fh_dentry.
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*/
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static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
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{
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struct knfsd_fh *fh = &fhp->fh_handle;
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struct fid *fid = NULL, sfid;
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struct svc_export *exp;
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struct dentry *dentry;
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int fileid_type;
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int data_left = fh->fh_size/4;
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__be32 error;
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error = nfserr_stale;
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if (rqstp->rq_vers > 2)
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error = nfserr_badhandle;
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if (rqstp->rq_vers == 4 && fh->fh_size == 0)
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return nfserr_nofilehandle;
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if (fh->fh_version == 1) {
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int len;
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if (--data_left < 0)
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return error;
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if (fh->fh_auth_type != 0)
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return error;
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len = key_len(fh->fh_fsid_type) / 4;
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if (len == 0)
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return error;
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if (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
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/* deprecated, convert to type 3 */
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len = key_len(FSID_ENCODE_DEV)/4;
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fh->fh_fsid_type = FSID_ENCODE_DEV;
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/*
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* struct knfsd_fh uses host-endian fields, which are
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* sometimes used to hold net-endian values. This
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* confuses sparse, so we must use __force here to
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* keep it from complaining.
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*/
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fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl((__force __be32)fh->fh_fsid[0]),
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ntohl((__force __be32)fh->fh_fsid[1])));
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fh->fh_fsid[1] = fh->fh_fsid[2];
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}
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data_left -= len;
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if (data_left < 0)
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return error;
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exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_fsid);
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fid = (struct fid *)(fh->fh_fsid + len);
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} else {
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__u32 tfh[2];
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dev_t xdev;
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ino_t xino;
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if (fh->fh_size != NFS_FHSIZE)
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return error;
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/* assume old filehandle format */
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xdev = old_decode_dev(fh->ofh_xdev);
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xino = u32_to_ino_t(fh->ofh_xino);
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mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL);
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exp = rqst_exp_find(rqstp, FSID_DEV, tfh);
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}
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error = nfserr_stale;
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if (PTR_ERR(exp) == -ENOENT)
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return error;
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if (IS_ERR(exp))
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return nfserrno(PTR_ERR(exp));
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if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
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/* Elevate privileges so that the lack of 'r' or 'x'
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* permission on some parent directory will
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* not stop exportfs_decode_fh from being able
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* to reconnect a directory into the dentry cache.
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* The same problem can affect "SUBTREECHECK" exports,
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* but as nfsd_acceptable depends on correct
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* access control settings being in effect, we cannot
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* fix that case easily.
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*/
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struct cred *new = prepare_creds();
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if (!new) {
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error = nfserrno(-ENOMEM);
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goto out;
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}
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new->cap_effective =
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cap_raise_nfsd_set(new->cap_effective,
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new->cap_permitted);
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put_cred(override_creds(new));
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put_cred(new);
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} else {
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error = nfsd_setuser_and_check_port(rqstp, exp);
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if (error)
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goto out;
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}
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/*
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* Look up the dentry using the NFS file handle.
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*/
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error = nfserr_stale;
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if (rqstp->rq_vers > 2)
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error = nfserr_badhandle;
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if (fh->fh_version != 1) {
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sfid.i32.ino = fh->ofh_ino;
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sfid.i32.gen = fh->ofh_generation;
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sfid.i32.parent_ino = fh->ofh_dirino;
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fid = &sfid;
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data_left = 3;
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if (fh->ofh_dirino == 0)
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fileid_type = FILEID_INO32_GEN;
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else
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fileid_type = FILEID_INO32_GEN_PARENT;
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} else
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fileid_type = fh->fh_fileid_type;
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if (fileid_type == FILEID_ROOT)
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dentry = dget(exp->ex_path.dentry);
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else {
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dentry = exportfs_decode_fh(exp->ex_path.mnt, fid,
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data_left, fileid_type,
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nfsd_acceptable, exp);
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}
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if (dentry == NULL)
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goto out;
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if (IS_ERR(dentry)) {
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if (PTR_ERR(dentry) != -EINVAL)
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error = nfserrno(PTR_ERR(dentry));
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goto out;
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}
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if (d_is_dir(dentry) &&
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(dentry->d_flags & DCACHE_DISCONNECTED)) {
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printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %pd2\n",
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dentry);
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}
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fhp->fh_dentry = dentry;
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fhp->fh_export = exp;
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return 0;
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out:
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exp_put(exp);
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return error;
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}
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/**
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* fh_verify - filehandle lookup and access checking
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* @rqstp: pointer to current rpc request
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* @fhp: filehandle to be verified
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* @type: expected type of object pointed to by filehandle
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* @access: type of access needed to object
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*
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* Look up a dentry from the on-the-wire filehandle, check the client's
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* access to the export, and set the current task's credentials.
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*
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* Regardless of success or failure of fh_verify(), fh_put() should be
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* called on @fhp when the caller is finished with the filehandle.
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*
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* fh_verify() may be called multiple times on a given filehandle, for
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* example, when processing an NFSv4 compound. The first call will look
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* up a dentry using the on-the-wire filehandle. Subsequent calls will
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* skip the lookup and just perform the other checks and possibly change
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* the current task's credentials.
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*
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* @type specifies the type of object expected using one of the S_IF*
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* constants defined in include/linux/stat.h. The caller may use zero
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* to indicate that it doesn't care, or a negative integer to indicate
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* that it expects something not of the given type.
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*
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* @access is formed from the NFSD_MAY_* constants defined in
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* include/linux/nfsd/nfsd.h.
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*/
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__be32
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fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access)
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{
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struct svc_export *exp;
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struct dentry *dentry;
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__be32 error;
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dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
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if (!fhp->fh_dentry) {
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error = nfsd_set_fh_dentry(rqstp, fhp);
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if (error)
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goto out;
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}
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dentry = fhp->fh_dentry;
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exp = fhp->fh_export;
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/*
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* We still have to do all these permission checks, even when
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* fh_dentry is already set:
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* - fh_verify may be called multiple times with different
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* "access" arguments (e.g. nfsd_proc_create calls
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* fh_verify(...,NFSD_MAY_EXEC) first, then later (in
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* nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE).
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* - in the NFSv4 case, the filehandle may have been filled
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* in by fh_compose, and given a dentry, but further
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* compound operations performed with that filehandle
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* still need permissions checks. In the worst case, a
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* mountpoint crossing may have changed the export
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* options, and we may now need to use a different uid
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* (for example, if different id-squashing options are in
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* effect on the new filesystem).
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*/
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error = check_pseudo_root(rqstp, dentry, exp);
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if (error)
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goto out;
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error = nfsd_setuser_and_check_port(rqstp, exp);
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if (error)
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goto out;
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error = nfsd_mode_check(rqstp, d_inode(dentry)->i_mode, type);
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if (error)
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goto out;
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/*
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* pseudoflavor restrictions are not enforced on NLM,
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* which clients virtually always use auth_sys for,
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* even while using RPCSEC_GSS for NFS.
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*/
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if (access & NFSD_MAY_LOCK || access & NFSD_MAY_BYPASS_GSS)
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goto skip_pseudoflavor_check;
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/*
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* Clients may expect to be able to use auth_sys during mount,
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* even if they use gss for everything else; see section 2.3.2
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* of rfc 2623.
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*/
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if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT
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&& exp->ex_path.dentry == dentry)
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goto skip_pseudoflavor_check;
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error = check_nfsd_access(exp, rqstp);
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if (error)
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goto out;
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skip_pseudoflavor_check:
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/* Finally, check access permissions. */
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error = nfsd_permission(rqstp, exp, dentry, access);
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if (error) {
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dprintk("fh_verify: %pd2 permission failure, "
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"acc=%x, error=%d\n",
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dentry,
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access, ntohl(error));
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}
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out:
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if (error == nfserr_stale)
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nfsdstats.fh_stale++;
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return error;
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}
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/*
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* Compose a file handle for an NFS reply.
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*
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* Note that when first composed, the dentry may not yet have
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* an inode. In this case a call to fh_update should be made
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* before the fh goes out on the wire ...
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*/
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static void _fh_update(struct svc_fh *fhp, struct svc_export *exp,
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struct dentry *dentry)
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{
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if (dentry != exp->ex_path.dentry) {
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struct fid *fid = (struct fid *)
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(fhp->fh_handle.fh_fsid + fhp->fh_handle.fh_size/4 - 1);
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int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4;
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int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK);
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fhp->fh_handle.fh_fileid_type =
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exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck);
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fhp->fh_handle.fh_size += maxsize * 4;
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} else {
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fhp->fh_handle.fh_fileid_type = FILEID_ROOT;
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}
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}
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/*
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* for composing old style file handles
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*/
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static inline void _fh_update_old(struct dentry *dentry,
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struct svc_export *exp,
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struct knfsd_fh *fh)
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{
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fh->ofh_ino = ino_t_to_u32(d_inode(dentry)->i_ino);
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fh->ofh_generation = d_inode(dentry)->i_generation;
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if (d_is_dir(dentry) ||
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(exp->ex_flags & NFSEXP_NOSUBTREECHECK))
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fh->ofh_dirino = 0;
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}
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static bool is_root_export(struct svc_export *exp)
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{
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return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root;
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}
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static struct super_block *exp_sb(struct svc_export *exp)
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{
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return d_inode(exp->ex_path.dentry)->i_sb;
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}
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static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp)
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{
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switch (fsid_type) {
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case FSID_DEV:
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if (!old_valid_dev(exp_sb(exp)->s_dev))
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return 0;
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/* FALL THROUGH */
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case FSID_MAJOR_MINOR:
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case FSID_ENCODE_DEV:
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return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV;
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case FSID_NUM:
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return exp->ex_flags & NFSEXP_FSID;
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case FSID_UUID8:
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case FSID_UUID16:
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if (!is_root_export(exp))
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return 0;
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/* fall through */
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case FSID_UUID4_INUM:
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case FSID_UUID16_INUM:
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return exp->ex_uuid != NULL;
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}
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return 1;
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}
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static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh)
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{
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u8 version;
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u8 fsid_type;
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retry:
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version = 1;
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if (ref_fh && ref_fh->fh_export == exp) {
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version = ref_fh->fh_handle.fh_version;
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fsid_type = ref_fh->fh_handle.fh_fsid_type;
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ref_fh = NULL;
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switch (version) {
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case 0xca:
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fsid_type = FSID_DEV;
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break;
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case 1:
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break;
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default:
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goto retry;
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}
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/*
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* As the fsid -> filesystem mapping was guided by
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* user-space, there is no guarantee that the filesystem
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* actually supports that fsid type. If it doesn't we
|
|
* loop around again without ref_fh set.
|
|
*/
|
|
if (!fsid_type_ok_for_exp(fsid_type, exp))
|
|
goto retry;
|
|
} else if (exp->ex_flags & NFSEXP_FSID) {
|
|
fsid_type = FSID_NUM;
|
|
} else if (exp->ex_uuid) {
|
|
if (fhp->fh_maxsize >= 64) {
|
|
if (is_root_export(exp))
|
|
fsid_type = FSID_UUID16;
|
|
else
|
|
fsid_type = FSID_UUID16_INUM;
|
|
} else {
|
|
if (is_root_export(exp))
|
|
fsid_type = FSID_UUID8;
|
|
else
|
|
fsid_type = FSID_UUID4_INUM;
|
|
}
|
|
} else if (!old_valid_dev(exp_sb(exp)->s_dev))
|
|
/* for newer device numbers, we must use a newer fsid format */
|
|
fsid_type = FSID_ENCODE_DEV;
|
|
else
|
|
fsid_type = FSID_DEV;
|
|
fhp->fh_handle.fh_version = version;
|
|
if (version)
|
|
fhp->fh_handle.fh_fsid_type = fsid_type;
|
|
}
|
|
|
|
__be32
|
|
fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
|
|
struct svc_fh *ref_fh)
|
|
{
|
|
/* ref_fh is a reference file handle.
|
|
* if it is non-null and for the same filesystem, then we should compose
|
|
* a filehandle which is of the same version, where possible.
|
|
* Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
|
|
* Then create a 32byte filehandle using nfs_fhbase_old
|
|
*
|
|
*/
|
|
|
|
struct inode * inode = d_inode(dentry);
|
|
dev_t ex_dev = exp_sb(exp)->s_dev;
|
|
|
|
dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %pd2, ino=%ld)\n",
|
|
MAJOR(ex_dev), MINOR(ex_dev),
|
|
(long) d_inode(exp->ex_path.dentry)->i_ino,
|
|
dentry,
|
|
(inode ? inode->i_ino : 0));
|
|
|
|
/* Choose filehandle version and fsid type based on
|
|
* the reference filehandle (if it is in the same export)
|
|
* or the export options.
|
|
*/
|
|
set_version_and_fsid_type(fhp, exp, ref_fh);
|
|
|
|
if (ref_fh == fhp)
|
|
fh_put(ref_fh);
|
|
|
|
if (fhp->fh_locked || fhp->fh_dentry) {
|
|
printk(KERN_ERR "fh_compose: fh %pd2 not initialized!\n",
|
|
dentry);
|
|
}
|
|
if (fhp->fh_maxsize < NFS_FHSIZE)
|
|
printk(KERN_ERR "fh_compose: called with maxsize %d! %pd2\n",
|
|
fhp->fh_maxsize,
|
|
dentry);
|
|
|
|
fhp->fh_dentry = dget(dentry); /* our internal copy */
|
|
fhp->fh_export = exp_get(exp);
|
|
|
|
if (fhp->fh_handle.fh_version == 0xca) {
|
|
/* old style filehandle please */
|
|
memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
|
|
fhp->fh_handle.fh_size = NFS_FHSIZE;
|
|
fhp->fh_handle.ofh_dcookie = 0xfeebbaca;
|
|
fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev);
|
|
fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev;
|
|
fhp->fh_handle.ofh_xino =
|
|
ino_t_to_u32(d_inode(exp->ex_path.dentry)->i_ino);
|
|
fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry));
|
|
if (inode)
|
|
_fh_update_old(dentry, exp, &fhp->fh_handle);
|
|
} else {
|
|
fhp->fh_handle.fh_size =
|
|
key_len(fhp->fh_handle.fh_fsid_type) + 4;
|
|
fhp->fh_handle.fh_auth_type = 0;
|
|
|
|
mk_fsid(fhp->fh_handle.fh_fsid_type,
|
|
fhp->fh_handle.fh_fsid,
|
|
ex_dev,
|
|
d_inode(exp->ex_path.dentry)->i_ino,
|
|
exp->ex_fsid, exp->ex_uuid);
|
|
|
|
if (inode)
|
|
_fh_update(fhp, exp, dentry);
|
|
if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) {
|
|
fh_put(fhp);
|
|
return nfserr_opnotsupp;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Update file handle information after changing a dentry.
|
|
* This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create
|
|
*/
|
|
__be32
|
|
fh_update(struct svc_fh *fhp)
|
|
{
|
|
struct dentry *dentry;
|
|
|
|
if (!fhp->fh_dentry)
|
|
goto out_bad;
|
|
|
|
dentry = fhp->fh_dentry;
|
|
if (d_really_is_negative(dentry))
|
|
goto out_negative;
|
|
if (fhp->fh_handle.fh_version != 1) {
|
|
_fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle);
|
|
} else {
|
|
if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT)
|
|
return 0;
|
|
|
|
_fh_update(fhp, fhp->fh_export, dentry);
|
|
if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID)
|
|
return nfserr_opnotsupp;
|
|
}
|
|
return 0;
|
|
out_bad:
|
|
printk(KERN_ERR "fh_update: fh not verified!\n");
|
|
return nfserr_serverfault;
|
|
out_negative:
|
|
printk(KERN_ERR "fh_update: %pd2 still negative!\n",
|
|
dentry);
|
|
return nfserr_serverfault;
|
|
}
|
|
|
|
/*
|
|
* Release a file handle.
|
|
*/
|
|
void
|
|
fh_put(struct svc_fh *fhp)
|
|
{
|
|
struct dentry * dentry = fhp->fh_dentry;
|
|
struct svc_export * exp = fhp->fh_export;
|
|
if (dentry) {
|
|
fh_unlock(fhp);
|
|
fhp->fh_dentry = NULL;
|
|
dput(dentry);
|
|
fh_clear_wcc(fhp);
|
|
}
|
|
fh_drop_write(fhp);
|
|
if (exp) {
|
|
exp_put(exp);
|
|
fhp->fh_export = NULL;
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Shorthand for dprintk()'s
|
|
*/
|
|
char * SVCFH_fmt(struct svc_fh *fhp)
|
|
{
|
|
struct knfsd_fh *fh = &fhp->fh_handle;
|
|
|
|
static char buf[80];
|
|
sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x",
|
|
fh->fh_size,
|
|
fh->fh_base.fh_pad[0],
|
|
fh->fh_base.fh_pad[1],
|
|
fh->fh_base.fh_pad[2],
|
|
fh->fh_base.fh_pad[3],
|
|
fh->fh_base.fh_pad[4],
|
|
fh->fh_base.fh_pad[5]);
|
|
return buf;
|
|
}
|
|
|
|
enum fsid_source fsid_source(struct svc_fh *fhp)
|
|
{
|
|
if (fhp->fh_handle.fh_version != 1)
|
|
return FSIDSOURCE_DEV;
|
|
switch(fhp->fh_handle.fh_fsid_type) {
|
|
case FSID_DEV:
|
|
case FSID_ENCODE_DEV:
|
|
case FSID_MAJOR_MINOR:
|
|
if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV)
|
|
return FSIDSOURCE_DEV;
|
|
break;
|
|
case FSID_NUM:
|
|
if (fhp->fh_export->ex_flags & NFSEXP_FSID)
|
|
return FSIDSOURCE_FSID;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
/* either a UUID type filehandle, or the filehandle doesn't
|
|
* match the export.
|
|
*/
|
|
if (fhp->fh_export->ex_flags & NFSEXP_FSID)
|
|
return FSIDSOURCE_FSID;
|
|
if (fhp->fh_export->ex_uuid)
|
|
return FSIDSOURCE_UUID;
|
|
return FSIDSOURCE_DEV;
|
|
}
|