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, 2015, Trustees of Indiana University
  24  *
  25  * Copyright (c) 2014, Intel Corporation.
  26  *
  27  * Author: Jeremy Filizetti <jfilizet@iu.edu>
  28  * Author: Andrew Korty <ajk@iu.edu>
  29  */
  30
  31 #define DEBUG_SUBSYSTEM S_SEC
  32 #include <linux/init.h>
  33 #include <linux/module.h>
  34 #include <linux/slab.h>
  35 #include <linux/crypto.h>
  36 #include <linux/mutex.h>
  37
  38 #include <obd.h>
  39 #include <obd_class.h>
  40 #include <obd_support.h>
  41
  42 #include "gss_err.h"
  43 #include "gss_internal.h"
  44 #include "gss_api.h"
  45 #include "gss_asn1.h"
  46
  47 struct null_ctx {
  48         __u64 nc_token;
  49 };
  50
  51 static
  52 __u32 gss_import_sec_context_null(rawobj_t *inbuf, struct gss_ctx *gss_context)
  53 {
  54         struct null_ctx *null_context;
  55
  56         if (inbuf == NULL || inbuf->data == NULL ||
  57             inbuf->len != sizeof(*null_context)) {
  58                 CDEBUG(D_SEC, "Invalid input buffer for null context\n");
  59                 return GSS_S_FAILURE;
  60         }
  61
  62         OBD_ALLOC_PTR(null_context);
  63         if (null_context == NULL)
  64                 return GSS_S_FAILURE;
  65
  66         memcpy(&null_context->nc_token, inbuf->data, inbuf->len);
  67
  68         gss_context->internal_ctx_id = null_context;
  69         CDEBUG(D_SEC, "successfully imported null context\n");
  70
  71         return GSS_S_COMPLETE;
  72 }
  73
  74 static
  75 __u32 gss_copy_reverse_context_null(struct gss_ctx *gss_context_old,
  76                                     struct gss_ctx *gss_context_new)
  77 {
  78         struct null_ctx *null_context_old;
  79         struct null_ctx *null_context_new;
  80
  81         OBD_ALLOC_PTR(null_context_new);
  82         if (null_context_new == NULL)
  83                 return GSS_S_FAILURE;
  84
  85         null_context_old = gss_context_old->internal_ctx_id;
  86         memcpy(null_context_new, null_context_old, sizeof(*null_context_new));
  87         gss_context_new->internal_ctx_id = null_context_new;
  88         CDEBUG(D_SEC, "successfully copied reverse null context\n");
  89
  90         return GSS_S_COMPLETE;
  91 }
  92
  93 static
  94 __u32 gss_inquire_context_null(struct gss_ctx *gss_context,
  95                                time64_t *endtime)
  96 {
  97         /* quick timeout for testing purposes */
  98         *endtime = ktime_get_real_seconds() + 60;
  99         return GSS_S_COMPLETE;
 100 }
 101
 102 static
 103 __u32 gss_wrap_null(struct gss_ctx *gss_context, rawobj_t *gss_header,
 104                     rawobj_t *message, int message_buffer_length,
 105                     rawobj_t *token)
 106 {
 107         return GSS_S_COMPLETE;
 108 }
 109
 110 static
 111 __u32 gss_unwrap_null(struct gss_ctx *gss_context, rawobj_t *gss_header,
 112                       rawobj_t *token, rawobj_t *message)
 113 {
 114         return GSS_S_COMPLETE;
 115 }
 116
 117 static
 118 __u32 gss_prep_bulk_null(struct gss_ctx *gss_context,
 119                          struct ptlrpc_bulk_desc *desc)
 120 {
 121         return GSS_S_COMPLETE;
 122 }
 123
 124 static
 125 __u32 gss_wrap_bulk_null(struct gss_ctx *gss_context,
 126                          struct ptlrpc_bulk_desc *desc, rawobj_t *token,
 127                          int adj_nob)
 128 {
 129         return GSS_S_COMPLETE;
 130 }
 131
 132 static
 133 __u32 gss_unwrap_bulk_null(struct gss_ctx *gss_context,
 134                            struct ptlrpc_bulk_desc *desc,
 135                            rawobj_t *token, int adj_nob)
 136 {
 137         return GSS_S_COMPLETE;
 138 }
 139
 140 static
 141 void gss_delete_sec_context_null(void *internal_context)
 142 {
 143         struct null_ctx *null_context = internal_context;
 144
 145         OBD_FREE_PTR(null_context);
 146 }
 147
 148 int gss_display_null(struct gss_ctx *gss_context, char *buf, int bufsize)
 149 {
 150         return snprintf(buf, bufsize, "null");
 151 }
 152
 153 static
 154 __u32 gss_get_mic_null(struct gss_ctx *gss_context, int message_count,
 155                        rawobj_t *messages, int iov_count, lnet_kiov_t *iovs,
 156                        rawobj_t *token)
 157 {
 158         return GSS_S_COMPLETE;
 159 }
 160
 161 static
 162 __u32 gss_verify_mic_null(struct gss_ctx *gss_context, int message_count,
 163                           rawobj_t *messages, int iov_count, lnet_kiov_t *iovs,
 164                           rawobj_t *token)
 165 {
 166         return GSS_S_COMPLETE;
 167 }
 168
 169 static struct gss_api_ops gss_null_ops = {
 170         .gss_import_sec_context     = gss_import_sec_context_null,
 171         .gss_copy_reverse_context   = gss_copy_reverse_context_null,
 172         .gss_inquire_context        = gss_inquire_context_null,
 173         .gss_get_mic                = gss_get_mic_null,
 174         .gss_verify_mic             = gss_verify_mic_null,
 175         .gss_wrap                   = gss_wrap_null,
 176         .gss_unwrap                 = gss_unwrap_null,
 177         .gss_prep_bulk              = gss_prep_bulk_null,
 178         .gss_wrap_bulk              = gss_wrap_bulk_null,
 179         .gss_unwrap_bulk            = gss_unwrap_bulk_null,
 180         .gss_delete_sec_context     = gss_delete_sec_context_null,
 181         .gss_display                = gss_display_null,
 182 };
 183
 184 static struct subflavor_desc gss_null_sfs[] = {
 185         {
 186                 .sf_subflavor   = SPTLRPC_SUBFLVR_GSSNULL,
 187                 .sf_qop         = 0,
 188                 .sf_service     = SPTLRPC_SVC_NULL,
 189                 .sf_name        = "gssnull"
 190         },
 191 };
 192
 193 static struct gss_api_mech gss_null_mech = {
 194         /* .gm_owner uses default NULL value for THIS_MODULE */
 195         .gm_name        = "gssnull",
 196         .gm_oid         = (rawobj_t) {
 197                 12,
 198                 "\053\006\001\004\001\311\146\215\126\001\000\000"
 199         },
 200         .gm_ops         = &gss_null_ops,
 201         .gm_sf_num      = 1,
 202         .gm_sfs         = gss_null_sfs,
 203 };
 204
 205 int __init init_null_module(void)
 206 {
 207         int status;
 208
 209         status = lgss_mech_register(&gss_null_mech);
 210         if (status)
 211                 CERROR("Failed to register null gss mechanism!\n");
 212
 213         return status;
 214 }
 215
 216 void cleanup_null_module(void)
 217 {
 218         lgss_mech_unregister(&gss_null_mech);
 219 }