Re: [PATCH v2 5/5] NFS: Determine initial mount security

[Andy Adamson <andros@xxxxxxxxxx>]

On Jan 5, 2011, at 2:49 PM, Bryan Schumaker wrote:

> 
> When sec=<something> is not presented as a mount option,
> we should attempt to determine what security flavor the
> server is using.
> 
> Signed-off-by: Bryan Schumaker <bjschuma@xxxxxxxxxx>
> ---
> fs/nfs/nfs4proc.c                     |   33 +++++++++++++++++++++++++++++++--
> include/linux/sunrpc/gss_api.h        |    3 +++
> net/sunrpc/auth_gss/gss_mech_switch.c |   16 ++++++++++++++++
> 3 files changed, 50 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
> index 4a1d79e..19ee25d 100644
> --- a/fs/nfs/nfs4proc.c
> +++ b/fs/nfs/nfs4proc.c
> @@ -41,6 +41,7 @@
> #include <linux/string.h>
> #include <linux/slab.h>
> #include <linux/sunrpc/clnt.h>
> +#include <linux/sunrpc/gss_api.h>
> #include <linux/nfs.h>
> #include <linux/nfs4.h>
> #include <linux/nfs_fs.h>
> @@ -2171,15 +2172,43 @@ static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
> 	return err;
> }
> 
> +static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
> +				struct nfs_fsinfo *info, rpc_authflavor_t flavor)
> +{
> +	struct rpc_auth *auth;
> +	int ret;
> +
> +	auth = rpcauth_create(flavor, server->client);
> +	if (!auth) {
> +		ret = -EIO;
> +		goto out;
> +	}

Are you leaking rpc_auth's?

-->Andy

> +	ret = nfs4_lookup_root(server, fhandle, info);
> +	if (ret < 0)
> +		ret = -EAGAIN;
> +out:
> +	return ret;
> +}
> +
> /*
>  * get the file handle for the "/" directory on the server
>  */
> static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
> 			      struct nfs_fsinfo *info)
> {
> -	int status;
> +	int i, len, status = 0;
> +	rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS + 2];
> 
> -	status = nfs4_lookup_root(server, fhandle, info);
> +	flav_array[0] = RPC_AUTH_UNIX;
> +	len = gss_mech_list_pseudoflavors(&flav_array[1]);
> +	flav_array[1+len] = RPC_AUTH_NULL;
> +	len += 2;
> +
> +	for (i = 0; i < len; i++) {
> +		status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
> +		if (status == 0)
> +			break;
> +	}
> 	if (status == 0)
> 		status = nfs4_server_capabilities(server, fhandle);
> 	if (status == 0)
> diff --git a/include/linux/sunrpc/gss_api.h b/include/linux/sunrpc/gss_api.h
> index 5d8048b..332da61 100644
> --- a/include/linux/sunrpc/gss_api.h
> +++ b/include/linux/sunrpc/gss_api.h
> @@ -126,6 +126,9 @@ struct gss_api_mech *gss_mech_get_by_name(const char *);
> /* Similar, but get by pseudoflavor. */
> struct gss_api_mech *gss_mech_get_by_pseudoflavor(u32);
> 
> +/* Fill in an array with a list of supported pseudoflavors */
> +int gss_mech_list_pseudoflavors(u32 *);
> +
> /* Just increments the mechanism's reference count and returns its input: */
> struct gss_api_mech * gss_mech_get(struct gss_api_mech *);
> 
> diff --git a/net/sunrpc/auth_gss/gss_mech_switch.c b/net/sunrpc/auth_gss/gss_mech_switch.c
> index 6c844b0..e3c36a2 100644
> --- a/net/sunrpc/auth_gss/gss_mech_switch.c
> +++ b/net/sunrpc/auth_gss/gss_mech_switch.c
> @@ -215,6 +215,22 @@ gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
> 
> EXPORT_SYMBOL_GPL(gss_mech_get_by_pseudoflavor);
> 
> +int gss_mech_list_pseudoflavors(rpc_authflavor_t *array_ptr)
> +{
> +	struct gss_api_mech *pos = NULL;
> +	int i = 0;
> +
> +	spin_lock(&registered_mechs_lock);
> +	list_for_each_entry(pos, &registered_mechs, gm_list) {
> +		array_ptr[i] = pos->gm_pfs->pseudoflavor;
> +		i++;
> +	}
> +	spin_unlock(&registered_mechs_lock);
> +	return i;
> +}
> +
> +EXPORT_SYMBOL_GPL(gss_mech_list_pseudoflavors);
> +
> u32
> gss_svc_to_pseudoflavor(struct gss_api_mech *gm, u32 service)
> {
> -- 
> 1.7.3.4
> 
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