NFSv4: Fix security auto-negotiation
NFSv4 security auto-negotiation has been broken since
commit 4580a92d44e2b21c2254fa5fef0f1bfb43c82318 (NFS:
Use server-recommended security flavor by default (NFSv3))
because nfs4_try_mount() will automatically select AUTH_SYS
if it sees no auth flavours.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Chuck Lever <chuck.lever@oracle.com>
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index f798925..cc80085 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -885,7 +885,7 @@
}
static int nfs4_server_common_setup(struct nfs_server *server,
- struct nfs_fh *mntfh)
+ struct nfs_fh *mntfh, bool auth_probe)
{
struct nfs_fattr *fattr;
int error;
@@ -917,7 +917,7 @@
/* Probe the root fh to retrieve its FSID and filehandle */
- error = nfs4_get_rootfh(server, mntfh);
+ error = nfs4_get_rootfh(server, mntfh, auth_probe);
if (error < 0)
goto out;
@@ -949,6 +949,7 @@
static int nfs4_init_server(struct nfs_server *server,
const struct nfs_parsed_mount_data *data)
{
+ rpc_authflavor_t pseudoflavor = RPC_AUTH_UNIX;
struct rpc_timeout timeparms;
int error;
@@ -961,13 +962,16 @@
server->flags = data->flags;
server->options = data->options;
+ if (data->auth_flavor_len >= 1)
+ pseudoflavor = data->auth_flavors[0];
+
/* Get a client record */
error = nfs4_set_client(server,
data->nfs_server.hostname,
(const struct sockaddr *)&data->nfs_server.address,
data->nfs_server.addrlen,
data->client_address,
- data->auth_flavors[0],
+ pseudoflavor,
data->nfs_server.protocol,
&timeparms,
data->minorversion,
@@ -987,7 +991,7 @@
server->port = data->nfs_server.port;
- error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
+ error = nfs_init_server_rpcclient(server, &timeparms, pseudoflavor);
error:
/* Done */
@@ -1005,6 +1009,7 @@
struct nfs_subversion *nfs_mod)
{
struct nfs_server *server;
+ bool auth_probe;
int error;
dprintk("--> nfs4_create_server()\n");
@@ -1013,12 +1018,14 @@
if (!server)
return ERR_PTR(-ENOMEM);
+ auth_probe = mount_info->parsed->auth_flavor_len < 1;
+
/* set up the general RPC client */
error = nfs4_init_server(server, mount_info->parsed);
if (error < 0)
goto error;
- error = nfs4_server_common_setup(server, mount_info->mntfh);
+ error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
if (error < 0)
goto error;
@@ -1071,7 +1078,7 @@
if (error < 0)
goto error;
- error = nfs4_server_common_setup(server, mntfh);
+ error = nfs4_server_common_setup(server, mntfh, false);
if (error < 0)
goto error;