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| author | J. Bruce Fields <bfields@redhat.com> | 2017-01-03 18:30:11 +0100 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2017-01-31 18:31:54 +0100 |
| commit | 32ddd944a056c786f6acdd95ed29e994adc613a2 (patch) | |
| tree | de1987f57f81d68f1ef68d89297d262abf43f37a /fs/nfsd | |
| parent | nfsd: constify nfsd_suppatttrs (diff) | |
| download | linux-32ddd944a056c786f6acdd95ed29e994adc613a2.tar.xz linux-32ddd944a056c786f6acdd95ed29e994adc613a2.zip | |
nfsd: opt in to labeled nfs per export
Currently turning on NFSv4.2 results in 4.2 clients suddenly seeing the
individual file labels as they're set on the server. This is not what
they've previously seen, and not appropriate in may cases. (In
particular, if clients have heterogenous security policies then one
client's labels may not even make sense to another.) Labeled NFS should
be opted in only in those cases when the administrator knows it makes
sense.
It's helpful to be able to turn 4.2 on by default, and otherwise the
protocol upgrade seems free of regressions. So, default labeled NFS to
off and provide an export flag to reenable it.
Users wanting labeled NFS support on an export will henceforth need to:
- make sure 4.2 support is enabled on client and server (as
before), and
- upgrade the server nfs-utils to a version supporting the new
"security_label" export flag.
- set that "security_label" flag on the export.
This is commit may be seen as a regression to anyone currently depending
on security labels. We believe those cases are currently rare.
Reported-by: tibbs@math.uh.edu
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
| -rw-r--r-- | fs/nfsd/export.c | 1 | ||||
| -rw-r--r-- | fs/nfsd/nfs4proc.c | 4 | ||||
| -rw-r--r-- | fs/nfsd/nfs4xdr.c | 5 |
3 files changed, 9 insertions, 1 deletions
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c index 43e109cc0ccc..e71f11b1a180 100644 --- a/fs/nfsd/export.c +++ b/fs/nfsd/export.c @@ -1102,6 +1102,7 @@ static struct flags { { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, { NFSEXP_V4ROOT, {"v4root", ""}}, { NFSEXP_PNFS, {"pnfs", ""}}, + { NFSEXP_SECURITY_LABEL, {"security_label", ""}}, { 0, {"", ""}} }; diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index 2d4eb47177d1..171f2d7ecfdd 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -95,11 +95,15 @@ check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, u32 *bmval, u32 *writable) { struct dentry *dentry = cstate->current_fh.fh_dentry; + struct svc_export *exp = cstate->current_fh.fh_export; if (!nfsd_attrs_supported(cstate->minorversion, bmval)) return nfserr_attrnotsupp; if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry))) return nfserr_attrnotsupp; + if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) && + !(exp->ex_flags & NFSEXP_SECURITY_LABEL)) + return nfserr_attrnotsupp; if (writable && !bmval_is_subset(bmval, writable)) return nfserr_inval; if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) && diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 12cc6b29e78c..3cc190755958 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -2417,8 +2417,11 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, #ifdef CONFIG_NFSD_V4_SECURITY_LABEL if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) || bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { - err = security_inode_getsecctx(d_inode(dentry), + if (exp->ex_flags & NFSEXP_SECURITY_LABEL) + err = security_inode_getsecctx(d_inode(dentry), &context, &contextlen); + else + err = -EOPNOTSUPP; contextsupport = (err == 0); if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { if (err == -EOPNOTSUPP) |