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authorJ. Bruce Fields <bfields@citi.umich.edu>2008-08-07 13:00:20 -0400
committerJ. Bruce Fields <bfields@citi.umich.edu>2008-09-29 17:56:56 -0400
commit04716e6621ff4abb422d64ba7b48718f52716a3e (patch)
tree742e2e7b6d4c7cf3a39f504000a49e57fe0b538b /fs/nfsd/vfs.c
parent5dd248f6f1ffe1f691fd66749e2a3dc8f8eb7b5e (diff)
nfsd: permit unauthenticated stat of export root
RFC 2623 section 2.3.2 permits the server to bypass gss authentication checks for certain operations that a client may perform when mounting. In the case of a client that doesn't have some form of credentials available to it on boot, this allows it to perform the mount unattended. (Presumably real file access won't be needed until a user with credentials logs in.) Being slightly more lenient allows lots of old clients to access krb5-only exports, with the only loss being a small amount of information leaked about the root directory of the export. This affects only v2 and v3; v4 still requires authentication for all access. Thanks to Peter Staubach testing against a Solaris client, which suggesting addition of v3 getattr, to the list, and to Trond for noting that doing so exposes no additional information. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Cc: Peter Staubach <staubach@redhat.com> Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Diffstat (limited to 'fs/nfsd/vfs.c')
-rw-r--r--fs/nfsd/vfs.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 18060bed5267..1319e8027d55 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1866,9 +1866,9 @@ out:
1866 * N.B. After this call fhp needs an fh_put 1866 * N.B. After this call fhp needs an fh_put
1867 */ 1867 */
1868__be32 1868__be32
1869nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat) 1869nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access)
1870{ 1870{
1871 __be32 err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); 1871 __be32 err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access);
1872 if (!err && vfs_statfs(fhp->fh_dentry,stat)) 1872 if (!err && vfs_statfs(fhp->fh_dentry,stat))
1873 err = nfserr_io; 1873 err = nfserr_io;
1874 return err; 1874 return err;