knfsd: nfsd4: secinfo handling without secinfo= option

We could return some sort of error in the case where someone asks for secinfo
on an export without the secinfo= option set--that'd be no worse than what
we've been doing.  But it's not really correct.  So, hack up an approximate
secinfo response in that case--it may not be complete, but it'll tell the
client at least one acceptable security flavor.

Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 864498f..b3d55c6 100644 (file)
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -57,6 +57,7 @@
 #include <linux/nfs4.h>
 #include <linux/nfs4_acl.h>
 #include <linux/sunrpc/gss_api.h>
+#include <linux/sunrpc/svcauth_gss.h>
 
 #define NFSDDBG_FACILITY               NFSDDBG_XDR
 
@@ -2454,15 +2455,38 @@ nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, int nfserr,
 {
        int i = 0;
        struct svc_export *exp = secinfo->si_exp;
+       u32 nflavs;
+       struct exp_flavor_info *flavs;
+       struct exp_flavor_info def_flavs[2];
        ENCODE_HEAD;
 
        if (nfserr)
                goto out;
+       if (exp->ex_nflavors) {
+               flavs = exp->ex_flavors;
+               nflavs = exp->ex_nflavors;
+       } else { /* Handling of some defaults in absence of real secinfo: */
+               flavs = def_flavs;
+               if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
+                       nflavs = 2;
+                       flavs[0].pseudoflavor = RPC_AUTH_UNIX;
+                       flavs[1].pseudoflavor = RPC_AUTH_NULL;
+               } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
+                       nflavs = 1;
+                       flavs[0].pseudoflavor
+                                       = svcauth_gss_flavor(exp->ex_client);
+               } else {
+                       nflavs = 1;
+                       flavs[0].pseudoflavor
+                                       = exp->ex_client->flavour->flavour;
+               }
+       }
+
        RESERVE_SPACE(4);
-       WRITE32(exp->ex_nflavors);
+       WRITE32(nflavs);
        ADJUST_ARGS();
-       for (i = 0; i < exp->ex_nflavors; i++) {
-               u32 flav = exp->ex_flavors[i].pseudoflavor;
+       for (i = 0; i < nflavs; i++) {
+               u32 flav = flavs[i].pseudoflavor;
                struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
 
                if (gm) {

diff --git a/include/linux/sunrpc/svcauth_gss.h b/include/linux/sunrpc/svcauth_gss.h
index 5a5db16..417a1de 100644 (file)
--- a/include/linux/sunrpc/svcauth_gss.h
+++ b/include/linux/sunrpc/svcauth_gss.h
@@ -22,6 +22,7 @@
 int gss_svc_init(void);
 void gss_svc_shutdown(void);
 int svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name);
+u32 svcauth_gss_flavor(struct auth_domain *dom);
 
 #endif /* __KERNEL__ */
 #endif /* _LINUX_SUNRPC_SVCAUTH_GSS_H */

diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c
index e4b3de0..4906975 100644 (file)
--- a/net/sunrpc/auth_gss/svcauth_gss.c
+++ b/net/sunrpc/auth_gss/svcauth_gss.c
@@ -743,6 +743,15 @@ find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
 
 static struct auth_ops svcauthops_gss;
 
+u32 svcauth_gss_flavor(struct auth_domain *dom)
+{
+       struct gss_domain *gd = container_of(dom, struct gss_domain, h);
+
+       return gd->pseudoflavor;
+}
+
+EXPORT_SYMBOL(svcauth_gss_flavor);
+
 int
 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
 {