lustre/ptlrpc/gss/gss_null_mech.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (C) 2013, Trustees of Indiana University
  24  *
  25  * Copyright (c) 2014, Intel Corporation.
  26  *
  27  * Author: Andrew Korty <ajk@iu.edu>
  28  */
  29
  30 #define DEBUG_SUBSYSTEM S_SEC
  31 #include <linux/init.h>
  32 #include <linux/module.h>
  33 #include <linux/slab.h>
  34 #include <linux/crypto.h>
  35 #include <linux/mutex.h>
  36
  37 #include <obd.h>
  38 #include <obd_class.h>
  39 #include <obd_support.h>
  40
  41 #include "gss_err.h"
  42 #include "gss_internal.h"
  43 #include "gss_api.h"
  44 #include "gss_asn1.h"
  45
  46 struct null_ctx {
  47 };
  48
  49 static
  50 __u32 gss_import_sec_context_null(rawobj_t *inbuf, struct gss_ctx *gss_context)
  51 {
  52         struct null_ctx *null_context;
  53
  54         if (inbuf == NULL || inbuf->data == NULL)
  55                 return GSS_S_FAILURE;
  56
  57         OBD_ALLOC_PTR(null_context);
  58         if (null_context == NULL)
  59                 return GSS_S_FAILURE;
  60
  61         gss_context->internal_ctx_id = null_context;
  62         CDEBUG(D_SEC, "successfully imported null context\n");
  63
  64         return GSS_S_COMPLETE;
  65 }
  66
  67 static
  68 __u32 gss_copy_reverse_context_null(struct gss_ctx *gss_context_old,
  69                                     struct gss_ctx *gss_context_new)
  70 {
  71         struct null_ctx *null_context_old;
  72         struct null_ctx *null_context_new;
  73
  74         OBD_ALLOC_PTR(null_context_new);
  75         if (null_context_new == NULL)
  76                 return GSS_S_FAILURE;
  77
  78         null_context_old = gss_context_old->internal_ctx_id;
  79         memcpy(null_context_new, null_context_old, sizeof(*null_context_new));
  80         gss_context_new->internal_ctx_id = null_context_new;
  81         CDEBUG(D_SEC, "successfully copied reverse null context\n");
  82
  83         return GSS_S_COMPLETE;
  84 }
  85
  86 static
  87 __u32 gss_inquire_context_null(struct gss_ctx *gss_context,
  88                                unsigned long *endtime)
  89 {
  90         *endtime = 0;
  91         return GSS_S_COMPLETE;
  92 }
  93
  94 static
  95 __u32 gss_wrap_null(struct gss_ctx *gss_context, rawobj_t *gss_header,
  96                     rawobj_t *message, int message_buffer_length,
  97                     rawobj_t *token)
  98 {
  99         return GSS_S_COMPLETE;
 100 }
 101
 102 static
 103 __u32 gss_unwrap_null(struct gss_ctx *gss_context, rawobj_t *gss_header,
 104                       rawobj_t *token, rawobj_t *message)
 105 {
 106         return GSS_S_COMPLETE;
 107 }
 108
 109 static
 110 __u32 gss_prep_bulk_null(struct gss_ctx *gss_context,
 111                          struct ptlrpc_bulk_desc *desc)
 112 {
 113         return GSS_S_COMPLETE;
 114 }
 115
 116 static
 117 __u32 gss_wrap_bulk_null(struct gss_ctx *gss_context,
 118                          struct ptlrpc_bulk_desc *desc, rawobj_t *token,
 119                          int adj_nob)
 120 {
 121         return GSS_S_COMPLETE;
 122 }
 123
 124 static
 125 __u32 gss_unwrap_bulk_null(struct gss_ctx *gss_context,
 126                            struct ptlrpc_bulk_desc *desc,
 127                            rawobj_t *token, int adj_nob)
 128 {
 129         return GSS_S_COMPLETE;
 130 }
 131
 132 static
 133 void gss_delete_sec_context_null(void *internal_context)
 134 {
 135         struct null_ctx *null_context = internal_context;
 136
 137         OBD_FREE_PTR(null_context);
 138 }
 139
 140 int gss_display_null(struct gss_ctx *gss_context, char *buf, int bufsize)
 141 {
 142         return snprintf(buf, bufsize, "null");
 143 }
 144
 145 static struct gss_api_ops gss_null_ops = {
 146         .gss_import_sec_context     = gss_import_sec_context_null,
 147         .gss_copy_reverse_context   = gss_copy_reverse_context_null,
 148         .gss_inquire_context        = gss_inquire_context_null,
 149         .gss_get_mic                = NULL,
 150         .gss_verify_mic             = NULL,
 151         .gss_wrap                   = gss_wrap_null,
 152         .gss_unwrap                 = gss_unwrap_null,
 153         .gss_prep_bulk              = gss_prep_bulk_null,
 154         .gss_wrap_bulk              = gss_wrap_bulk_null,
 155         .gss_unwrap_bulk            = gss_unwrap_bulk_null,
 156         .gss_delete_sec_context     = gss_delete_sec_context_null,
 157         .gss_display                = gss_display_null,
 158 };
 159
 160 static struct subflavor_desc gss_null_sfs[] = {
 161         {
 162                 .sf_subflavor   = SPTLRPC_SUBFLVR_GSSNULL,
 163                 .sf_qop         = 0,
 164                 .sf_service     = SPTLRPC_SVC_NULL,
 165                 .sf_name        = "gssnull"
 166         },
 167 };
 168
 169 /*
 170  * currently we leave module owner NULL
 171  */
 172 static struct gss_api_mech gss_null_mech = {
 173         .gm_owner       = NULL, /*THIS_MODULE, */
 174         .gm_name        = "gssnull",
 175         .gm_oid         = (rawobj_t) {
 176                 12,
 177                 "\053\006\001\004\001\311\146\215\126\001\000\000"
 178         },
 179         .gm_ops         = &gss_null_ops,
 180         .gm_sf_num      = 1,
 181         .gm_sfs         = gss_null_sfs,
 182 };
 183
 184 int __init init_null_module(void)
 185 {
 186         int status;
 187
 188         status = lgss_mech_register(&gss_null_mech);
 189         if (status)
 190                 CERROR("Failed to register null gss mechanism!\n");
 191
 192         return status;
 193 }
 194
 195 void cleanup_null_module(void)
 196 {
 197         lgss_mech_unregister(&gss_null_mech);
 198 }