lustre/ptlrpc/gss/gss_mech_switch.c

   1 /*
   2  * Modifications for Lustre
   3  *
   4  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
   5  *
   6  * Author: Eric Mei <ericm@clusterfs.com>
   7  */
   8
   9 /*
  10  *  linux/net/sunrpc/gss_mech_switch.c
  11  *
  12  *  Copyright (c) 2001 The Regents of the University of Michigan.
  13  *  All rights reserved.
  14  *
  15  *  J. Bruce Fields   <bfields@umich.edu>
  16  *
  17  *  Redistribution and use in source and binary forms, with or without
  18  *  modification, are permitted provided that the following conditions
  19  *  are met:
  20  *
  21  *  1. Redistributions of source code must retain the above copyright
  22  *     notice, this list of conditions and the following disclaimer.
  23  *  2. Redistributions in binary form must reproduce the above copyright
  24  *     notice, this list of conditions and the following disclaimer in the
  25  *     documentation and/or other materials provided with the distribution.
  26  *  3. Neither the name of the University nor the names of its
  27  *     contributors may be used to endorse or promote products derived
  28  *     from this software without specific prior written permission.
  29  *
  30  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  31  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  32  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  33  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  34  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  35  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  36  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  37  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  38  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  39  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  40  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  41  *
  42  */
  43
  44 #define DEBUG_SUBSYSTEM S_SEC
  45 #ifdef __KERNEL__
  46 #include <linux/init.h>
  47 #include <linux/module.h>
  48 #include <linux/slab.h>
  49 #include <linux/mutex.h>
  50 #else
  51 #include <liblustre.h>
  52 #endif
  53
  54 #include <obd.h>
  55 #include <obd_class.h>
  56 #include <obd_support.h>
  57 #include <lustre/lustre_idl.h>
  58 #include <lustre_net.h>
  59 #include <lustre_import.h>
  60 #include <lustre_sec.h>
  61
  62 #include "gss_err.h"
  63 #include "gss_internal.h"
  64 #include "gss_api.h"
  65
  66 static CFS_LIST_HEAD(registered_mechs);
  67 static DEFINE_SPINLOCK(registered_mechs_lock);
  68
  69 int lgss_mech_register(struct gss_api_mech *gm)
  70 {
  71         spin_lock(&registered_mechs_lock);
  72         cfs_list_add(&gm->gm_list, &registered_mechs);
  73         spin_unlock(&registered_mechs_lock);
  74         CWARN("Register %s mechanism\n", gm->gm_name);
  75         return 0;
  76 }
  77
  78 void lgss_mech_unregister(struct gss_api_mech *gm)
  79 {
  80         spin_lock(&registered_mechs_lock);
  81         cfs_list_del(&gm->gm_list);
  82         spin_unlock(&registered_mechs_lock);
  83         CWARN("Unregister %s mechanism\n", gm->gm_name);
  84 }
  85
  86
  87 struct gss_api_mech *lgss_mech_get(struct gss_api_mech *gm)
  88 {
  89         __cfs_module_get(gm->gm_owner);
  90         return gm;
  91 }
  92
  93 struct gss_api_mech *lgss_name_to_mech(char *name)
  94 {
  95         struct gss_api_mech *pos, *gm = NULL;
  96
  97         spin_lock(&registered_mechs_lock);
  98         cfs_list_for_each_entry(pos, &registered_mechs, gm_list) {
  99                 if (0 == strcmp(name, pos->gm_name)) {
 100                         if (!cfs_try_module_get(pos->gm_owner))
 101                                 continue;
 102                         gm = pos;
 103                         break;
 104                 }
 105         }
 106         spin_unlock(&registered_mechs_lock);
 107         return gm;
 108
 109 }
 110
 111 static inline
 112 int mech_supports_subflavor(struct gss_api_mech *gm, __u32 subflavor)
 113 {
 114         int i;
 115
 116         for (i = 0; i < gm->gm_sf_num; i++) {
 117                 if (gm->gm_sfs[i].sf_subflavor == subflavor)
 118                         return 1;
 119         }
 120         return 0;
 121 }
 122
 123 struct gss_api_mech *lgss_subflavor_to_mech(__u32 subflavor)
 124 {
 125         struct gss_api_mech *pos, *gm = NULL;
 126
 127         spin_lock(&registered_mechs_lock);
 128         cfs_list_for_each_entry(pos, &registered_mechs, gm_list) {
 129                 if (!cfs_try_module_get(pos->gm_owner))
 130                         continue;
 131                 if (!mech_supports_subflavor(pos, subflavor)) {
 132                         cfs_module_put(pos->gm_owner);
 133                         continue;
 134                 }
 135                 gm = pos;
 136                 break;
 137         }
 138         spin_unlock(&registered_mechs_lock);
 139         return gm;
 140 }
 141
 142 void lgss_mech_put(struct gss_api_mech *gm)
 143 {
 144         cfs_module_put(gm->gm_owner);
 145 }
 146
 147 /* The mech could probably be determined from the token instead, but it's just
 148  * as easy for now to pass it in. */
 149 __u32 lgss_import_sec_context(rawobj_t *input_token,
 150                               struct gss_api_mech *mech,
 151                               struct gss_ctx **ctx_id)
 152 {
 153         OBD_ALLOC_PTR(*ctx_id);
 154         if (*ctx_id == NULL)
 155                 return GSS_S_FAILURE;
 156
 157         (*ctx_id)->mech_type = lgss_mech_get(mech);
 158
 159         LASSERT(mech);
 160         LASSERT(mech->gm_ops);
 161         LASSERT(mech->gm_ops->gss_import_sec_context);
 162         return mech->gm_ops->gss_import_sec_context(input_token, *ctx_id);
 163 }
 164
 165 __u32 lgss_copy_reverse_context(struct gss_ctx *ctx_id,
 166                                 struct gss_ctx **ctx_id_new)
 167 {
 168         struct gss_api_mech *mech = ctx_id->mech_type;
 169         __u32                major;
 170
 171         LASSERT(mech);
 172
 173         OBD_ALLOC_PTR(*ctx_id_new);
 174         if (*ctx_id_new == NULL)
 175                 return GSS_S_FAILURE;
 176
 177         (*ctx_id_new)->mech_type = lgss_mech_get(mech);
 178
 179         LASSERT(mech);
 180         LASSERT(mech->gm_ops);
 181         LASSERT(mech->gm_ops->gss_copy_reverse_context);
 182
 183         major = mech->gm_ops->gss_copy_reverse_context(ctx_id, *ctx_id_new);
 184         if (major != GSS_S_COMPLETE) {
 185                 lgss_mech_put(mech);
 186                 OBD_FREE_PTR(*ctx_id_new);
 187                 *ctx_id_new = NULL;
 188         }
 189         return major;
 190 }
 191
 192 /*
 193  * this interface is much simplified, currently we only need endtime.
 194  */
 195 __u32 lgss_inquire_context(struct gss_ctx *context_handle,
 196                            unsigned long  *endtime)
 197 {
 198         LASSERT(context_handle);
 199         LASSERT(context_handle->mech_type);
 200         LASSERT(context_handle->mech_type->gm_ops);
 201         LASSERT(context_handle->mech_type->gm_ops->gss_inquire_context);
 202
 203         return context_handle->mech_type->gm_ops
 204                 ->gss_inquire_context(context_handle,
 205                                       endtime);
 206 }
 207
 208 /* gss_get_mic: compute a mic over message and return mic_token. */
 209 __u32 lgss_get_mic(struct gss_ctx *context_handle,
 210                    int msgcnt,
 211                    rawobj_t *msg,
 212                    int iovcnt,
 213                    lnet_kiov_t *iovs,
 214                    rawobj_t *mic_token)
 215 {
 216         LASSERT(context_handle);
 217         LASSERT(context_handle->mech_type);
 218         LASSERT(context_handle->mech_type->gm_ops);
 219         LASSERT(context_handle->mech_type->gm_ops->gss_get_mic);
 220
 221         return context_handle->mech_type->gm_ops
 222                 ->gss_get_mic(context_handle,
 223                               msgcnt,
 224                               msg,
 225                               iovcnt,
 226                               iovs,
 227                               mic_token);
 228 }
 229
 230 /* gss_verify_mic: check whether the provided mic_token verifies message. */
 231 __u32 lgss_verify_mic(struct gss_ctx *context_handle,
 232                       int msgcnt,
 233                       rawobj_t *msg,
 234                       int iovcnt,
 235                       lnet_kiov_t *iovs,
 236                       rawobj_t *mic_token)
 237 {
 238         LASSERT(context_handle);
 239         LASSERT(context_handle->mech_type);
 240         LASSERT(context_handle->mech_type->gm_ops);
 241         LASSERT(context_handle->mech_type->gm_ops->gss_verify_mic);
 242
 243         return context_handle->mech_type->gm_ops
 244                 ->gss_verify_mic(context_handle,
 245                                  msgcnt,
 246                                  msg,
 247                                  iovcnt,
 248                                  iovs,
 249                                  mic_token);
 250 }
 251
 252 __u32 lgss_wrap(struct gss_ctx *context_handle,
 253                 rawobj_t *gsshdr,
 254                 rawobj_t *msg,
 255                 int msg_buflen,
 256                 rawobj_t *out_token)
 257 {
 258         LASSERT(context_handle);
 259         LASSERT(context_handle->mech_type);
 260         LASSERT(context_handle->mech_type->gm_ops);
 261         LASSERT(context_handle->mech_type->gm_ops->gss_wrap);
 262
 263         return context_handle->mech_type->gm_ops
 264                 ->gss_wrap(context_handle, gsshdr, msg, msg_buflen, out_token);
 265 }
 266
 267 __u32 lgss_unwrap(struct gss_ctx *context_handle,
 268                   rawobj_t *gsshdr,
 269                   rawobj_t *token,
 270                   rawobj_t *out_msg)
 271 {
 272         LASSERT(context_handle);
 273         LASSERT(context_handle->mech_type);
 274         LASSERT(context_handle->mech_type->gm_ops);
 275         LASSERT(context_handle->mech_type->gm_ops->gss_unwrap);
 276
 277         return context_handle->mech_type->gm_ops
 278                 ->gss_unwrap(context_handle, gsshdr, token, out_msg);
 279 }
 280
 281
 282 __u32 lgss_prep_bulk(struct gss_ctx *context_handle,
 283                      struct ptlrpc_bulk_desc *desc)
 284 {
 285         LASSERT(context_handle);
 286         LASSERT(context_handle->mech_type);
 287         LASSERT(context_handle->mech_type->gm_ops);
 288         LASSERT(context_handle->mech_type->gm_ops->gss_prep_bulk);
 289
 290         return context_handle->mech_type->gm_ops
 291                 ->gss_prep_bulk(context_handle, desc);
 292 }
 293
 294 __u32 lgss_wrap_bulk(struct gss_ctx *context_handle,
 295                      struct ptlrpc_bulk_desc *desc,
 296                      rawobj_t *token,
 297                      int adj_nob)
 298 {
 299         LASSERT(context_handle);
 300         LASSERT(context_handle->mech_type);
 301         LASSERT(context_handle->mech_type->gm_ops);
 302         LASSERT(context_handle->mech_type->gm_ops->gss_wrap_bulk);
 303
 304         return context_handle->mech_type->gm_ops
 305                 ->gss_wrap_bulk(context_handle, desc, token, adj_nob);
 306 }
 307
 308 __u32 lgss_unwrap_bulk(struct gss_ctx *context_handle,
 309                        struct ptlrpc_bulk_desc *desc,
 310                        rawobj_t *token,
 311                        int adj_nob)
 312 {
 313         LASSERT(context_handle);
 314         LASSERT(context_handle->mech_type);
 315         LASSERT(context_handle->mech_type->gm_ops);
 316         LASSERT(context_handle->mech_type->gm_ops->gss_unwrap_bulk);
 317
 318         return context_handle->mech_type->gm_ops
 319                 ->gss_unwrap_bulk(context_handle, desc, token, adj_nob);
 320 }
 321
 322 /* gss_delete_sec_context: free all resources associated with context_handle.
 323  * Note this differs from the RFC 2744-specified prototype in that we don't
 324  * bother returning an output token, since it would never be used anyway. */
 325
 326 __u32 lgss_delete_sec_context(struct gss_ctx **context_handle)
 327 {
 328         struct gss_api_mech *mech;
 329
 330         CDEBUG(D_SEC, "deleting %p\n", *context_handle);
 331
 332         if (!*context_handle)
 333                 return(GSS_S_NO_CONTEXT);
 334
 335         mech = (*context_handle)->mech_type;
 336         if ((*context_handle)->internal_ctx_id != 0) {
 337                 LASSERT(mech);
 338                 LASSERT(mech->gm_ops);
 339                 LASSERT(mech->gm_ops->gss_delete_sec_context);
 340                 mech->gm_ops->gss_delete_sec_context(
 341                                         (*context_handle)->internal_ctx_id);
 342         }
 343         if (mech)
 344                 lgss_mech_put(mech);
 345
 346         OBD_FREE_PTR(*context_handle);
 347         *context_handle=NULL;
 348         return GSS_S_COMPLETE;
 349 }
 350
 351 int lgss_display(struct gss_ctx *ctx,
 352                  char           *buf,
 353                  int             bufsize)
 354 {
 355         LASSERT(ctx);
 356         LASSERT(ctx->mech_type);
 357         LASSERT(ctx->mech_type->gm_ops);
 358         LASSERT(ctx->mech_type->gm_ops->gss_display);
 359
 360         return ctx->mech_type->gm_ops->gss_display(ctx, buf, bufsize);
 361 }