[Bug 201073] [nfsclient] RPCSEC_GSS principal includes inappropriate directory path

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201073

            Bug ID: 201073
           Summary: [nfsclient] RPCSEC_GSS principal includes
                    inappropriate directory path
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: masato at itc.naist.jp

NFS client requests invalid principal name for RPCSEC_GSS security.
The man page mount_nfs(8) explains that default principal name is
nfs@<server-fqdn>, but NFS client uses nfs@<rhost>:<path> which includes
inappropriate directory path.

Workaround:
Explicitly use principal option for mount_nfs command.

Fix:
===================================================================
--- sys/fs/nfsclient/nfs_clvfsops.c    (revision 284717)
+++ sys/fs/nfsclient/nfs_clvfsops.c    (working copy)
@@ -774,7 +774,7 @@
     struct thread *td;
     char hst[MNAMELEN];
     u_char nfh[NFSX_FHMAX], krbname[100], dirpath[100], srvkrbname[100];
-    char *opt, *name, *secname;
+    char *opt, *name, *secname, *cp;
     int nametimeo = NFS_DEFAULT_NAMETIMEO;
     int negnametimeo = NFS_DEFAULT_NEGNAMETIMEO;
     int minvers = 0;
@@ -1153,8 +1153,13 @@

     if (vfs_getopt(mp->mnt_optnew, "principal", (void **)&name, NULL) == 0)
         strlcpy(srvkrbname, name, sizeof (srvkrbname));
-    else
+    else {
         snprintf(srvkrbname, sizeof (srvkrbname), "nfs@%s", hst);
+        cp = strchr(srvkrbname, ':');
+        if (cp != NULL) {
+            *cp = '\0';
+        }
+    }
     srvkrbnamelen = strlen(srvkrbname);

     if (vfs_getopt(mp->mnt_optnew, "gssname", (void **)&name, NULL) == 0)

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