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authorJ. Bruce Fields <bfields@citi.umich.edu>2008-08-07 21:00:20 +0400
committerJ. Bruce Fields <bfields@citi.umich.edu>2008-09-30 01:56:56 +0400
commit04716e6621ff4abb422d64ba7b48718f52716a3e (patch)
tree742e2e7b6d4c7cf3a39f504000a49e57fe0b538b /fs/nfsd/nfsproc.c
parent5dd248f6f1ffe1f691fd66749e2a3dc8f8eb7b5e (diff)
downloadlinux-04716e6621ff4abb422d64ba7b48718f52716a3e.tar.xz
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/nfsproc.c')
-rw-r--r--fs/nfsd/nfsproc.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c
index 0766f95d236a..5cffeca7acef 100644
--- a/fs/nfsd/nfsproc.c
+++ b/fs/nfsd/nfsproc.c
@@ -65,7 +65,8 @@ nfsd_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle *argp,
dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
fh_copy(&resp->fh, &argp->fh);
- nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
+ nfserr = fh_verify(rqstp, &resp->fh, 0,
+ NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
return nfsd_return_attrs(nfserr, resp);
}
@@ -521,7 +522,8 @@ nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle *argp,
dprintk("nfsd: STATFS %s\n", SVCFH_fmt(&argp->fh));
- nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats);
+ nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
+ NFSD_MAY_BYPASS_GSS_ON_ROOT);
fh_put(&argp->fh);
return nfserr;
}