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Subject[PATCH 011 of 20] knfsd: nfsd4: return nfserr_wrongsec

From: andros@citi.umich.edu <andros@citi.umich.edu>

Make the first actual use of the secinfo information by using it to
return nfserr_wrongsec when an export is found that doesn't allow the
flavor used on this request.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Andy Adamson <andros@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>

### Diffstat output
./fs/nfsd/export.c | 26 ++++++++++++++++++++++++++
./fs/nfsd/nfsfh.c | 6 ++++++
./fs/nfsd/nfssvc.c | 10 ++++++++++
./fs/nfsd/vfs.c | 4 ++++
./include/linux/nfsd/export.h | 1 +
./include/linux/nfsd/nfsd.h | 1 +
6 files changed, 48 insertions(+)

diff .prev/fs/nfsd/export.c ./fs/nfsd/export.c
--- .prev/fs/nfsd/export.c 2007-07-10 11:37:38.000000000 +1000
+++ ./fs/nfsd/export.c 2007-07-10 11:39:34.000000000 +1000
@@ -1228,6 +1228,28 @@ exp_find(struct auth_domain *clp, int fs
return exp;
}

+__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
+{
+ struct exp_flavor_info *f;
+ struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
+
+ /* legacy gss-only clients are always OK: */
+ if (exp->ex_client == rqstp->rq_gssclient)
+ return 0;
+ /* ip-address based client; check sec= export option: */
+ for (f = exp->ex_flavors; f < end; f++) {
+ if (f->pseudoflavor == rqstp->rq_flavor)
+ return 0;
+ }
+ /* defaults in absence of sec= options: */
+ if (exp->ex_nflavors == 0) {
+ if (rqstp->rq_flavor == RPC_AUTH_NULL ||
+ rqstp->rq_flavor == RPC_AUTH_UNIX)
+ return 0;
+ }
+ return nfserr_wrongsec;
+}
+
/*
* Uses rq_client and rq_gssclient to find an export; uses rq_client (an
* auth_unix client) if it's available and has secinfo information;
@@ -1340,6 +1362,10 @@ exp_pseudoroot(struct svc_rqst *rqstp, s
if (IS_ERR(exp))
return nfserrno(PTR_ERR(exp));
rv = fh_compose(fhp, exp, exp->ex_dentry, NULL);
+ if (rv)
+ goto out;
+ rv = check_nfsd_access(exp, rqstp);
+out:
exp_put(exp);
return rv;
}
diff .prev/fs/nfsd/nfsfh.c ./fs/nfsd/nfsfh.c
--- .prev/fs/nfsd/nfsfh.c 2007-07-10 11:35:37.000000000 +1000
+++ ./fs/nfsd/nfsfh.c 2007-07-10 11:39:34.000000000 +1000
@@ -20,6 +20,7 @@

#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/svcauth_gss.h>
#include <linux/nfsd/nfsd.h>

#define NFSDDBG_FACILITY NFSDDBG_FH
@@ -248,6 +249,11 @@ fh_verify(struct svc_rqst *rqstp, struct
if (error)
goto out;

+ /* Check security flavor */
+ error = check_nfsd_access(exp, rqstp);
+ if (error)
+ goto out;
+
/* Finally, check access permissions. */
error = nfsd_permission(exp, dentry, access);

diff .prev/fs/nfsd/nfssvc.c ./fs/nfsd/nfssvc.c
--- .prev/fs/nfsd/nfssvc.c 2007-07-10 11:19:56.000000000 +1000
+++ ./fs/nfsd/nfssvc.c 2007-07-10 11:39:34.000000000 +1000
@@ -494,6 +494,15 @@ out:
module_put_and_exit(0);
}

+static __be32 map_new_errors(u32 vers, __be32 nfserr)
+{
+ if (nfserr == nfserr_jukebox && vers == 2)
+ return nfserr_dropit;
+ if (nfserr == nfserr_wrongsec && vers < 4)
+ return nfserr_acces;
+ return nfserr;
+}
+
int
nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
{
@@ -536,6 +545,7 @@ nfsd_dispatch(struct svc_rqst *rqstp, __

/* Now call the procedure handler, and encode NFS status. */
nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
+ nfserr = map_new_errors(rqstp->rq_vers, nfserr);
if (nfserr == nfserr_jukebox && rqstp->rq_vers == 2)
nfserr = nfserr_dropit;
if (nfserr == nfserr_dropit) {
diff .prev/fs/nfsd/vfs.c ./fs/nfsd/vfs.c
--- .prev/fs/nfsd/vfs.c 2007-07-10 11:38:15.000000000 +1000
+++ ./fs/nfsd/vfs.c 2007-07-10 11:39:34.000000000 +1000
@@ -240,6 +240,9 @@ nfsd_lookup(struct svc_rqst *rqstp, stru
err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry);
if (err)
return err;
+ err = check_nfsd_access(exp, rqstp);
+ if (err)
+ goto out;
/*
* Note: we compose the file handle now, but as the
* dentry may be negative, it may need to be updated.
@@ -247,6 +250,7 @@ nfsd_lookup(struct svc_rqst *rqstp, stru
err = fh_compose(resfh, exp, dentry, fhp);
if (!err && !dentry->d_inode)
err = nfserr_noent;
+out:
dput(dentry);
exp_put(exp);
return err;
diff .prev/include/linux/nfsd/export.h ./include/linux/nfsd/export.h
--- .prev/include/linux/nfsd/export.h 2007-07-10 11:34:22.000000000 +1000
+++ ./include/linux/nfsd/export.h 2007-07-10 11:39:34.000000000 +1000
@@ -116,6 +116,7 @@ struct svc_expkey {
#define EX_NOHIDE(exp) ((exp)->ex_flags & NFSEXP_NOHIDE)
#define EX_WGATHER(exp) ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)

+__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);

/*
* Function declarations
diff .prev/include/linux/nfsd/nfsd.h ./include/linux/nfsd/nfsd.h
--- .prev/include/linux/nfsd/nfsd.h 2007-07-10 11:19:56.000000000 +1000
+++ ./include/linux/nfsd/nfsd.h 2007-07-10 11:39:34.000000000 +1000
@@ -236,6 +236,7 @@ void nfsd_lockd_shutdown(void);
#define nfserr_badname __constant_htonl(NFSERR_BADNAME)
#define nfserr_cb_path_down __constant_htonl(NFSERR_CB_PATH_DOWN)
#define nfserr_locked __constant_htonl(NFSERR_LOCKED)
+#define nfserr_wrongsec __constant_htonl(NFSERR_WRONGSEC)
#define nfserr_replay_me __constant_htonl(NFSERR_REPLAY_ME)

/* error codes for internal use */
-
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