knfsd: nfsd4: parse secinfo information in exports downcall

We add a list of pseudoflavors to each export downcall, which will be used
both as a list of security flavors allowed on that export, and (in the order
given) as the list of pseudoflavors to return on secinfo calls.

This patch parses the new downcall information and adds it to the export
structure, but doesn't use it for anything yet.

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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index d4accdcb53a2563168523c504563ef2e09e5f240..fbbbcc5a2fa39bdac6aaf8499eb18068e0e3dbd2 100644 (file)
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -33,6 +33,8 @@
 #include <linux/nfsd/nfsfh.h>
 #include <linux/nfsd/syscall.h>
 #include <linux/lockd/bind.h>
+#include <linux/sunrpc/msg_prot.h>
+#include <linux/sunrpc/gss_api.h>
 
 #define NFSDDBG_FACILITY       NFSDDBG_EXPORT
 
@@ -452,8 +454,48 @@ out_free_all:
        return err;
 }
 
+static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
+{
+       int listsize, err;
+       struct exp_flavor_info *f;
+
+       err = get_int(mesg, &listsize);
+       if (err)
+               return err;
+       if (listsize < 0 || listsize > MAX_SECINFO_LIST)
+               return -EINVAL;
+
+       for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
+               err = get_int(mesg, &f->pseudoflavor);
+               if (err)
+                       return err;
+               /*
+                * Just a quick sanity check; we could also try to check
+                * whether this pseudoflavor is supported, but at worst
+                * an unsupported pseudoflavor on the export would just
+                * be a pseudoflavor that won't match the flavor of any
+                * authenticated request.  The administrator will
+                * probably discover the problem when someone fails to
+                * authenticate.
+                */
+               if (f->pseudoflavor < 0)
+                       return -EINVAL;
+               err = get_int(mesg, &f->flags);
+               if (err)
+                       return err;
+               /* Only some flags are allowed to differ between flavors: */
+               if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
+                       return -EINVAL;
+       }
+       exp->ex_nflavors = listsize;
+       return 0;
+}
+
 #else /* CONFIG_NFSD_V4 */
-static inline int fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) { return 0; }
+static inline int
+fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
+static inline int
+secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
 #endif
 
 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
@@ -477,6 +519,9 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
 
        exp.ex_uuid = NULL;
 
+       /* secinfo */
+       exp.ex_nflavors = 0;
+
        if (mesg[mlen-1] != '\n')
                return -EINVAL;
        mesg[mlen-1] = 0;
@@ -554,7 +599,9 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
                                        if (exp.ex_uuid == NULL)
                                                err = -ENOMEM;
                                }
-                       } else
+                       } else if (strcmp(buf, "secinfo") == 0)
+                               err = secinfo_parse(&mesg, buf, &exp);
+                       else
                                /* quietly ignore unknown words and anything
                                 * following. Newer user-space can try to set
                                 * new values, then see what the result was.
@@ -655,6 +702,7 @@ static void export_update(struct cache_head *cnew, struct cache_head *citem)
 {
        struct svc_export *new = container_of(cnew, struct svc_export, h);
        struct svc_export *item = container_of(citem, struct svc_export, h);
+       int i;
 
        new->ex_flags = item->ex_flags;
        new->ex_anon_uid = item->ex_anon_uid;
@@ -670,6 +718,10 @@ static void export_update(struct cache_head *cnew, struct cache_head *citem)
        item->ex_fslocs.locations_count = 0;
        new->ex_fslocs.migrated = item->ex_fslocs.migrated;
        item->ex_fslocs.migrated = 0;
+       new->ex_nflavors = item->ex_nflavors;
+       for (i = 0; i < MAX_SECINFO_LIST; i++) {
+               new->ex_flavors[i] = item->ex_flavors[i];
+       }
 }
 
 static struct cache_head *svc_export_alloc(void)

diff --git a/include/linux/nfsd/export.h b/include/linux/nfsd/export.h
index 9f62d6182d32824b3e9f8afd22b01532b98680af..736f0eafcedf56e84c8c4e13f994d00618efc1e9 100644 (file)
--- a/include/linux/nfsd/export.h
+++ b/include/linux/nfsd/export.h
@@ -42,6 +42,8 @@
 #define        NFSEXP_NOACL            0x8000  /* reserved for possible ACL related use */
 #define NFSEXP_ALLFLAGS                0xFE3F
 
+/* The flags that may vary depending on security flavor: */
+#define NFSEXP_SECINFO_FLAGS   0
 
 #ifdef __KERNEL__
 
@@ -64,6 +66,19 @@ struct nfsd4_fs_locations {
        int migrated;
 };
 
+/*
+ * We keep an array of pseudoflavors with the export, in order from most
+ * to least preferred.  For the forseeable future, we don't expect more
+ * than the eight pseudoflavors null, unix, krb5, krb5i, krb5p, skpm3,
+ * spkm3i, and spkm3p (and using all 8 at once should be rare).
+ */
+#define MAX_SECINFO_LIST       8
+
+struct exp_flavor_info {
+       u32     pseudoflavor;
+       u32     flags;
+};
+
 struct svc_export {
        struct cache_head       h;
        struct auth_domain *    ex_client;
@@ -76,6 +91,8 @@ struct svc_export {
        int                     ex_fsid;
        unsigned char *         ex_uuid; /* 16 byte fsid */
        struct nfsd4_fs_locations ex_fslocs;
+       int                     ex_nflavors;
+       struct exp_flavor_info  ex_flavors[MAX_SECINFO_LIST];
 };
 
 /* an "export key" (expkey) maps a filehandlefragement to an