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Diffstat (limited to 'fs/nfsd/nfs4idmap.c')
-rw-r--r--fs/nfsd/nfs4idmap.c53
1 files changed, 49 insertions, 4 deletions
diff --git a/fs/nfsd/nfs4idmap.c b/fs/nfsd/nfs4idmap.c
index 94096273cd6c..322d11ce06a4 100644
--- a/fs/nfsd/nfs4idmap.c
+++ b/fs/nfsd/nfs4idmap.c
@@ -41,6 +41,14 @@
#include "nfsd.h"
/*
+ * Turn off idmapping when using AUTH_SYS.
+ */
+static bool nfs4_disable_idmapping = true;
+module_param(nfs4_disable_idmapping, bool, 0644);
+MODULE_PARM_DESC(nfs4_disable_idmapping,
+ "Turn off server's NFSv4 idmapping when using 'sec=sys'");
+
+/*
* Cache entry
*/
@@ -561,28 +569,65 @@ idmap_id_to_name(struct svc_rqst *rqstp, int type, uid_t id, char *name)
return ret;
}
+static bool
+numeric_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, uid_t *id)
+{
+ int ret;
+ char buf[11];
+
+ if (namelen + 1 > sizeof(buf))
+ /* too long to represent a 32-bit id: */
+ return false;
+ /* Just to make sure it's null-terminated: */
+ memcpy(buf, name, namelen);
+ buf[namelen] = '\0';
+ ret = kstrtouint(name, 10, id);
+ return ret == 0;
+}
+
+static __be32
+do_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, uid_t *id)
+{
+ if (nfs4_disable_idmapping && rqstp->rq_flavor < RPC_AUTH_GSS)
+ if (numeric_name_to_id(rqstp, type, name, namelen, id))
+ return 0;
+ /*
+ * otherwise, fall through and try idmapping, for
+ * backwards compatibility with clients sending names:
+ */
+ return idmap_name_to_id(rqstp, type, name, namelen, id);
+}
+
+static int
+do_id_to_name(struct svc_rqst *rqstp, int type, uid_t id, char *name)
+{
+ if (nfs4_disable_idmapping && rqstp->rq_flavor < RPC_AUTH_GSS)
+ return sprintf(name, "%u", id);
+ return idmap_id_to_name(rqstp, type, id, name);
+}
+
__be32
nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen,
__u32 *id)
{
- return idmap_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, id);
+ return do_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, id);
}
__be32
nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen,
__u32 *id)
{
- return idmap_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, id);
+ return do_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, id);
}
int
nfsd_map_uid_to_name(struct svc_rqst *rqstp, __u32 id, char *name)
{
- return idmap_id_to_name(rqstp, IDMAP_TYPE_USER, id, name);
+ return do_id_to_name(rqstp, IDMAP_TYPE_USER, id, name);
}
int
nfsd_map_gid_to_name(struct svc_rqst *rqstp, __u32 id, char *name)
{
- return idmap_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name);
+ return do_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name);
}