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nfsd: add proc file listing kernel's gss_krb5 enctypes

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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: Kevin Coffman <kwc@citi.umich.edu>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Kevin Coffman 2011-03-02 19:51:42 -05:00 committed by J. Bruce Fields
parent 540c8cb6a5
commit b0b0c0a26e
1 changed files with 30 additions and 1 deletions
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31
fs/nfsd/nfsctl.c
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@ -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},