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Commit b0b0c0a2 authored by Kevin Coffman's avatar Kevin Coffman Committed by J. Bruce Fields
Browse files

nfsd: add proc file listing kernel's gss_krb5 enctypes 



Add a new proc file which lists the encryption types supported
by the kernel's gss_krb5 code.

Newer MIT Kerberos libraries support the assertion of acceptor
subkeys.  This enctype information allows user-land (svcgssd)
to request that the Kerberos libraries limit the encryption
types that it uses when generating the subkeys.

Signed-off-by: default avatarKevin Coffman <kwc@citi.umich.edu>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 540c8cb6

fs/nfsd/nfsctl.c

+30 −1
Original line number Diff line number Diff line
@@ -12,13 +12,14 @@ 
#include <linux/nfsd/syscall.h>

#include <linux/lockd/lockd.h>

#include <linux/sunrpc/clnt.h>

#include <linux/sunrpc/gss_api.h>



#include "idmap.h"

#include "nfsd.h"

#include "cache.h"



/*

 *	We have a single directory with 9 nodes in it.

 *	We have a single directory with several nodes in it.

 */

enum {

	NFSD_Root = 1,
@@ -42,6 +43,7 @@ enum { 
	NFSD_Versions,

	NFSD_Ports,

	NFSD_MaxBlkSize,

	NFSD_SupportedEnctypes,

	/*

	 * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]

	 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
@@ -187,6 +189,32 @@ static struct file_operations export_features_operations = { 
	.release	= single_release,

};



static int supported_enctypes_show(struct seq_file *m, void *v)

{

	struct gss_api_mech *k5mech;



	k5mech = gss_mech_get_by_name("krb5");

	if (k5mech == NULL)

		goto out;

	if (k5mech->gm_upcall_enctypes != NULL)

		seq_printf(m, k5mech->gm_upcall_enctypes);

	gss_mech_put(k5mech);

out:

	return 0;

}



static int supported_enctypes_open(struct inode *inode, struct file *file)

{

	return single_open(file, supported_enctypes_show, NULL);

}



static struct file_operations supported_enctypes_ops = {

	.open		= supported_enctypes_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release	= single_release,

};



extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);

extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
@@ -1397,6 +1425,7 @@ static int nfsd_fill_super(struct super_block * sb, void * data, int silent) 
		[NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},

		[NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},

		[NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},

		[NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},

#ifdef CONFIG_NFSD_V4

		[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},

		[NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},