lustre/ptlrpc/gss/gss_bulk.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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2014, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/ptlrpc/gss/gss_bulk.c
  37  *
  38  * Author: Eric Mei <eric.mei@sun.com>
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_SEC
  42 #include <linux/init.h>
  43 #include <linux/module.h>
  44 #include <linux/slab.h>
  45 #include <linux/dcache.h>
  46 #include <linux/fs.h>
  47 #include <linux/mutex.h>
  48 #include <linux/crypto.h>
  49
  50 #include <obd.h>
  51 #include <obd_class.h>
  52 #include <obd_support.h>
  53 #include <lustre/lustre_idl.h>
  54 #include <lustre_net.h>
  55 #include <lustre_import.h>
  56 #include <lustre_sec.h>
  57
  58 #include "gss_err.h"
  59 #include "gss_internal.h"
  60 #include "gss_api.h"
  61
  62 int gss_cli_ctx_wrap_bulk(struct ptlrpc_cli_ctx *ctx,
  63                           struct ptlrpc_request *req,
  64                           struct ptlrpc_bulk_desc *desc)
  65 {
  66         struct gss_cli_ctx              *gctx;
  67         struct lustre_msg               *msg;
  68         struct ptlrpc_bulk_sec_desc     *bsd;
  69         rawobj_t                         token;
  70         __u32                            maj;
  71         int                              offset;
  72         int                              rc;
  73         ENTRY;
  74
  75         LASSERT(req->rq_pack_bulk);
  76         LASSERT(req->rq_bulk_read || req->rq_bulk_write);
  77
  78         gctx = container_of(ctx, struct gss_cli_ctx, gc_base);
  79         LASSERT(gctx->gc_mechctx);
  80
  81         switch (SPTLRPC_FLVR_SVC(req->rq_flvr.sf_rpc)) {
  82         case SPTLRPC_SVC_NULL:
  83                 LASSERT(req->rq_reqbuf->lm_bufcount >= 3);
  84                 msg = req->rq_reqbuf;
  85                 offset = msg->lm_bufcount - 1;
  86                 break;
  87         case SPTLRPC_SVC_AUTH:
  88         case SPTLRPC_SVC_INTG:
  89                 LASSERT(req->rq_reqbuf->lm_bufcount >= 4);
  90                 msg = req->rq_reqbuf;
  91                 offset = msg->lm_bufcount - 2;
  92                 break;
  93         case SPTLRPC_SVC_PRIV:
  94                 LASSERT(req->rq_clrbuf->lm_bufcount >= 2);
  95                 msg = req->rq_clrbuf;
  96                 offset = msg->lm_bufcount - 1;
  97                 break;
  98         default:
  99                 LBUG();
 100         }
 101
 102         bsd = lustre_msg_buf(msg, offset, sizeof(*bsd));
 103         bsd->bsd_version = 0;
 104         bsd->bsd_flags = 0;
 105         bsd->bsd_type = SPTLRPC_BULK_DEFAULT;
 106         bsd->bsd_svc = SPTLRPC_FLVR_BULK_SVC(req->rq_flvr.sf_rpc);
 107
 108         if (bsd->bsd_svc == SPTLRPC_BULK_SVC_NULL)
 109                 RETURN(0);
 110
 111         LASSERT(bsd->bsd_svc == SPTLRPC_BULK_SVC_INTG ||
 112                 bsd->bsd_svc == SPTLRPC_BULK_SVC_PRIV);
 113
 114         if (req->rq_bulk_read) {
 115                 /*
 116                  * bulk read: prepare receiving pages only for privacy mode.
 117                  */
 118                 if (bsd->bsd_svc == SPTLRPC_BULK_SVC_PRIV)
 119                         return gss_cli_prep_bulk(req, desc);
 120         } else {
 121                 /*
 122                  * bulk write: sign or encrypt bulk pages.
 123                  */
 124                 bsd->bsd_nob = desc->bd_nob;
 125
 126                 if (bsd->bsd_svc == SPTLRPC_BULK_SVC_INTG) {
 127                         /* integrity mode */
 128                         token.data = bsd->bsd_data;
 129                         token.len = lustre_msg_buflen(msg, offset) -
 130                                     sizeof(*bsd);
 131
 132                         maj = lgss_get_mic(gctx->gc_mechctx, 0, NULL,
 133                                            desc->bd_iov_count, desc->bd_iov,
 134                                            &token);
 135                         if (maj != GSS_S_COMPLETE) {
 136                                 CWARN("failed to sign bulk data: %x\n", maj);
 137                                 RETURN(-EACCES);
 138                         }
 139                 } else {
 140                         /* privacy mode */
 141                         if (desc->bd_iov_count == 0)
 142                                 RETURN(0);
 143
 144                         rc = sptlrpc_enc_pool_get_pages(desc);
 145                         if (rc) {
 146                                 CERROR("bulk write: failed to allocate "
 147                                        "encryption pages: %d\n", rc);
 148                                 RETURN(rc);
 149                         }
 150
 151                         token.data = bsd->bsd_data;
 152                         token.len = lustre_msg_buflen(msg, offset) -
 153                                     sizeof(*bsd);
 154
 155                         maj = lgss_wrap_bulk(gctx->gc_mechctx, desc, &token, 0);
 156                         if (maj != GSS_S_COMPLETE) {
 157                                 CWARN("fail to encrypt bulk data: %x\n", maj);
 158                                 RETURN(-EACCES);
 159                         }
 160                 }
 161         }
 162
 163         RETURN(0);
 164 }
 165
 166 int gss_cli_ctx_unwrap_bulk(struct ptlrpc_cli_ctx *ctx,
 167                             struct ptlrpc_request *req,
 168                             struct ptlrpc_bulk_desc *desc)
 169 {
 170         struct gss_cli_ctx              *gctx;
 171         struct lustre_msg               *rmsg, *vmsg;
 172         struct ptlrpc_bulk_sec_desc     *bsdr, *bsdv;
 173         rawobj_t                         token;
 174         __u32                            maj;
 175         int                              roff, voff;
 176         ENTRY;
 177
 178         LASSERT(req->rq_pack_bulk);
 179         LASSERT(req->rq_bulk_read || req->rq_bulk_write);
 180
 181         switch (SPTLRPC_FLVR_SVC(req->rq_flvr.sf_rpc)) {
 182         case SPTLRPC_SVC_NULL:
 183                 vmsg = req->rq_repdata;
 184                 LASSERT(vmsg != NULL && vmsg->lm_bufcount >= 3);
 185                 voff = vmsg->lm_bufcount - 1;
 186
 187                 rmsg = req->rq_reqbuf;
 188                 LASSERT(rmsg != NULL && rmsg->lm_bufcount >= 3);
 189                 roff = rmsg->lm_bufcount - 1; /* last segment */
 190                 break;
 191         case SPTLRPC_SVC_AUTH:
 192         case SPTLRPC_SVC_INTG:
 193                 vmsg = req->rq_repdata;
 194                 LASSERT(vmsg != NULL && vmsg->lm_bufcount >= 4);
 195                 voff = vmsg->lm_bufcount - 2;
 196
 197                 rmsg = req->rq_reqbuf;
 198                 LASSERT(rmsg != NULL && rmsg->lm_bufcount >= 4);
 199                 roff = rmsg->lm_bufcount - 2; /* second last segment */
 200                 break;
 201         case SPTLRPC_SVC_PRIV:
 202                 vmsg = req->rq_repdata;
 203                 LASSERT(vmsg != NULL && vmsg->lm_bufcount >= 2);
 204                 voff = vmsg->lm_bufcount - 1;
 205
 206                 rmsg = req->rq_clrbuf;
 207                 LASSERT(rmsg != NULL && rmsg->lm_bufcount >= 2);
 208                 roff = rmsg->lm_bufcount - 1; /* last segment */
 209                 break;
 210         default:
 211                 LBUG();
 212         }
 213
 214         bsdr = lustre_msg_buf(rmsg, roff, sizeof(*bsdr));
 215         bsdv = lustre_msg_buf(vmsg, voff, sizeof(*bsdv));
 216         LASSERT(bsdr && bsdv);
 217
 218         if (bsdr->bsd_version != bsdv->bsd_version ||
 219             bsdr->bsd_type != bsdv->bsd_type ||
 220             bsdr->bsd_svc != bsdv->bsd_svc) {
 221                 CERROR("bulk security descriptor mismatch: "
 222                        "(%u,%u,%u) != (%u,%u,%u)\n",
 223                        bsdr->bsd_version, bsdr->bsd_type, bsdr->bsd_svc,
 224                        bsdv->bsd_version, bsdv->bsd_type, bsdv->bsd_svc);
 225                 RETURN(-EPROTO);
 226         }
 227
 228         LASSERT(bsdv->bsd_svc == SPTLRPC_BULK_SVC_NULL ||
 229                 bsdv->bsd_svc == SPTLRPC_BULK_SVC_INTG ||
 230                 bsdv->bsd_svc == SPTLRPC_BULK_SVC_PRIV);
 231
 232         /*
 233          * in privacy mode if return success, make sure bd_nob_transferred
 234          * is the actual size of the clear text, otherwise upper layer
 235          * may be surprised.
 236          */
 237         if (req->rq_bulk_write) {
 238                 if (bsdv->bsd_flags & BSD_FL_ERR) {
 239                         CERROR("server reported bulk i/o failure\n");
 240                         RETURN(-EIO);
 241                 }
 242
 243                 if (bsdv->bsd_svc == SPTLRPC_BULK_SVC_PRIV)
 244                         desc->bd_nob_transferred = desc->bd_nob;
 245         } else {
 246                 /*
 247                  * bulk read, upon return success, bd_nob_transferred is
 248                  * the size of plain text actually received.
 249                  */
 250                 gctx = container_of(ctx, struct gss_cli_ctx, gc_base);
 251                 LASSERT(gctx->gc_mechctx);
 252
 253                 if (bsdv->bsd_svc == SPTLRPC_BULK_SVC_INTG) {
 254                         int i, nob;
 255
 256                         /* fix the actual data size */
 257                         for (i = 0, nob = 0; i < desc->bd_iov_count; i++) {
 258                                 if (desc->bd_iov[i].kiov_len + nob >
 259                                     desc->bd_nob_transferred) {
 260                                         desc->bd_iov[i].kiov_len =
 261                                                 desc->bd_nob_transferred - nob;
 262                                 }
 263                                 nob += desc->bd_iov[i].kiov_len;
 264                         }
 265
 266                         token.data = bsdv->bsd_data;
 267                         token.len = lustre_msg_buflen(vmsg, voff) -
 268                                     sizeof(*bsdv);
 269
 270                         maj = lgss_verify_mic(gctx->gc_mechctx, 0, NULL,
 271                                               desc->bd_iov_count, desc->bd_iov,
 272                                               &token);
 273                         if (maj != GSS_S_COMPLETE) {
 274                                 CERROR("failed to verify bulk read: %x\n", maj);
 275                                 RETURN(-EACCES);
 276                         }
 277                 } else if (bsdv->bsd_svc == SPTLRPC_BULK_SVC_PRIV) {
 278                         desc->bd_nob = bsdv->bsd_nob;
 279                         if (desc->bd_nob == 0)
 280                                 RETURN(0);
 281
 282                         token.data = bsdv->bsd_data;
 283                         token.len = lustre_msg_buflen(vmsg, voff) -
 284                                     sizeof(*bsdr);
 285
 286                         maj = lgss_unwrap_bulk(gctx->gc_mechctx, desc,
 287                                                &token, 1);
 288                         if (maj != GSS_S_COMPLETE) {
 289                                 CERROR("failed to decrypt bulk read: %x\n",
 290                                        maj);
 291                                 RETURN(-EACCES);
 292                         }
 293
 294                         desc->bd_nob_transferred = desc->bd_nob;
 295                 }
 296         }
 297
 298         RETURN(0);
 299 }
 300
 301 static int gss_prep_bulk(struct ptlrpc_bulk_desc *desc,
 302                          struct gss_ctx *mechctx)
 303 {
 304         int     rc;
 305
 306         if (desc->bd_iov_count == 0)
 307                 return 0;
 308
 309         rc = sptlrpc_enc_pool_get_pages(desc);
 310         if (rc)
 311                 return rc;
 312
 313         if (lgss_prep_bulk(mechctx, desc) != GSS_S_COMPLETE)
 314                 return -EACCES;
 315
 316         return 0;
 317 }
 318
 319 int gss_cli_prep_bulk(struct ptlrpc_request *req,
 320                       struct ptlrpc_bulk_desc *desc)
 321 {
 322         int             rc;
 323         ENTRY;
 324
 325         LASSERT(req->rq_cli_ctx);
 326         LASSERT(req->rq_pack_bulk);
 327         LASSERT(req->rq_bulk_read);
 328
 329         if (SPTLRPC_FLVR_BULK_SVC(req->rq_flvr.sf_rpc) != SPTLRPC_BULK_SVC_PRIV)
 330                 RETURN(0);
 331
 332         rc = gss_prep_bulk(desc, ctx2gctx(req->rq_cli_ctx)->gc_mechctx);
 333         if (rc)
 334                 CERROR("bulk read: failed to prepare encryption "
 335                        "pages: %d\n", rc);
 336
 337         RETURN(rc);
 338 }
 339
 340 int gss_svc_prep_bulk(struct ptlrpc_request *req,
 341                       struct ptlrpc_bulk_desc *desc)
 342 {
 343         struct gss_svc_reqctx        *grctx;
 344         struct ptlrpc_bulk_sec_desc  *bsd;
 345         int                           rc;
 346         ENTRY;
 347
 348         LASSERT(req->rq_svc_ctx);
 349         LASSERT(req->rq_pack_bulk);
 350         LASSERT(req->rq_bulk_write);
 351
 352         grctx = gss_svc_ctx2reqctx(req->rq_svc_ctx);
 353         LASSERT(grctx->src_reqbsd);
 354         LASSERT(grctx->src_repbsd);
 355         LASSERT(grctx->src_ctx);
 356         LASSERT(grctx->src_ctx->gsc_mechctx);
 357
 358         bsd = grctx->src_reqbsd;
 359         if (bsd->bsd_svc != SPTLRPC_BULK_SVC_PRIV)
 360                 RETURN(0);
 361
 362         rc = gss_prep_bulk(desc, grctx->src_ctx->gsc_mechctx);
 363         if (rc)
 364                 CERROR("bulk write: failed to prepare encryption "
 365                        "pages: %d\n", rc);
 366
 367         RETURN(rc);
 368 }
 369
 370 int gss_svc_unwrap_bulk(struct ptlrpc_request *req,
 371                         struct ptlrpc_bulk_desc *desc)
 372 {
 373         struct gss_svc_reqctx        *grctx;
 374         struct ptlrpc_bulk_sec_desc  *bsdr, *bsdv;
 375         rawobj_t                      token;
 376         __u32                         maj;
 377         ENTRY;
 378
 379         LASSERT(req->rq_svc_ctx);
 380         LASSERT(req->rq_pack_bulk);
 381         LASSERT(req->rq_bulk_write);
 382
 383         grctx = gss_svc_ctx2reqctx(req->rq_svc_ctx);
 384
 385         LASSERT(grctx->src_reqbsd);
 386         LASSERT(grctx->src_repbsd);
 387         LASSERT(grctx->src_ctx);
 388         LASSERT(grctx->src_ctx->gsc_mechctx);
 389
 390         bsdr = grctx->src_reqbsd;
 391         bsdv = grctx->src_repbsd;
 392
 393         /* bsdr has been sanity checked during unpacking */
 394         bsdv->bsd_version = 0;
 395         bsdv->bsd_type = SPTLRPC_BULK_DEFAULT;
 396         bsdv->bsd_svc = bsdr->bsd_svc;
 397         bsdv->bsd_flags = 0;
 398
 399         switch (bsdv->bsd_svc) {
 400         case SPTLRPC_BULK_SVC_INTG:
 401                 token.data = bsdr->bsd_data;
 402                 token.len = grctx->src_reqbsd_size - sizeof(*bsdr);
 403
 404                 maj = lgss_verify_mic(grctx->src_ctx->gsc_mechctx, 0, NULL,
 405                                       desc->bd_iov_count, desc->bd_iov, &token);
 406                 if (maj != GSS_S_COMPLETE) {
 407                         bsdv->bsd_flags |= BSD_FL_ERR;
 408                         CERROR("failed to verify bulk signature: %x\n", maj);
 409                         RETURN(-EACCES);
 410                 }
 411                 break;
 412         case SPTLRPC_BULK_SVC_PRIV:
 413                 if (bsdr->bsd_nob != desc->bd_nob) {
 414                         bsdv->bsd_flags |= BSD_FL_ERR;
 415                         CERROR("prepared nob %d doesn't match the actual "
 416                                "nob %d\n", desc->bd_nob, bsdr->bsd_nob);
 417                         RETURN(-EPROTO);
 418                 }
 419
 420                 if (desc->bd_iov_count == 0) {
 421                         LASSERT(desc->bd_nob == 0);
 422                         break;
 423                 }
 424
 425                 token.data = bsdr->bsd_data;
 426                 token.len = grctx->src_reqbsd_size - sizeof(*bsdr);
 427
 428                 maj = lgss_unwrap_bulk(grctx->src_ctx->gsc_mechctx,
 429                                        desc, &token, 0);
 430                 if (maj != GSS_S_COMPLETE) {
 431                         bsdv->bsd_flags |= BSD_FL_ERR;
 432                         CERROR("failed decrypt bulk data: %x\n", maj);
 433                         RETURN(-EACCES);
 434                 }
 435                 break;
 436         }
 437
 438         RETURN(0);
 439 }
 440
 441 int gss_svc_wrap_bulk(struct ptlrpc_request *req,
 442                       struct ptlrpc_bulk_desc *desc)
 443 {
 444         struct gss_svc_reqctx        *grctx;
 445         struct ptlrpc_bulk_sec_desc  *bsdr, *bsdv;
 446         rawobj_t                      token;
 447         __u32                         maj;
 448         int                           rc;
 449         ENTRY;
 450
 451         LASSERT(req->rq_svc_ctx);
 452         LASSERT(req->rq_pack_bulk);
 453         LASSERT(req->rq_bulk_read);
 454
 455         grctx = gss_svc_ctx2reqctx(req->rq_svc_ctx);
 456
 457         LASSERT(grctx->src_reqbsd);
 458         LASSERT(grctx->src_repbsd);
 459         LASSERT(grctx->src_ctx);
 460         LASSERT(grctx->src_ctx->gsc_mechctx);
 461
 462         bsdr = grctx->src_reqbsd;
 463         bsdv = grctx->src_repbsd;
 464
 465         /* bsdr has been sanity checked during unpacking */
 466         bsdv->bsd_version = 0;
 467         bsdv->bsd_type = SPTLRPC_BULK_DEFAULT;
 468         bsdv->bsd_svc = bsdr->bsd_svc;
 469         bsdv->bsd_flags = 0;
 470
 471         switch (bsdv->bsd_svc) {
 472         case SPTLRPC_BULK_SVC_INTG:
 473                 token.data = bsdv->bsd_data;
 474                 token.len = grctx->src_repbsd_size - sizeof(*bsdv);
 475
 476                 maj = lgss_get_mic(grctx->src_ctx->gsc_mechctx, 0, NULL,
 477                                    desc->bd_iov_count, desc->bd_iov, &token);
 478                 if (maj != GSS_S_COMPLETE) {
 479                         bsdv->bsd_flags |= BSD_FL_ERR;
 480                         CERROR("failed to sign bulk data: %x\n", maj);
 481                         RETURN(-EACCES);
 482                 }
 483                 break;
 484         case SPTLRPC_BULK_SVC_PRIV:
 485                 bsdv->bsd_nob = desc->bd_nob;
 486
 487                 if (desc->bd_iov_count == 0) {
 488                         LASSERT(desc->bd_nob == 0);
 489                         break;
 490                 }
 491
 492                 rc = sptlrpc_enc_pool_get_pages(desc);
 493                 if (rc) {
 494                         bsdv->bsd_flags |= BSD_FL_ERR;
 495                         CERROR("bulk read: failed to allocate encryption "
 496                                "pages: %d\n", rc);
 497                         RETURN(rc);
 498                 }
 499
 500                 token.data = bsdv->bsd_data;
 501                 token.len = grctx->src_repbsd_size - sizeof(*bsdv);
 502
 503                 maj = lgss_wrap_bulk(grctx->src_ctx->gsc_mechctx,
 504                                      desc, &token, 1);
 505                 if (maj != GSS_S_COMPLETE) {
 506                         bsdv->bsd_flags |= BSD_FL_ERR;
 507                         CERROR("failed to encrypt bulk data: %x\n", maj);
 508                         RETURN(-EACCES);
 509                 }
 510                 break;
 511         }
 512
 513         RETURN(0);
 514 }