lustre/ptlrpc/sec_plain.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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2015, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/ptlrpc/sec_plain.c
  33  *
  34  * Author: Eric Mei <ericm@clusterfs.com>
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_SEC
  38
  39
  40 #include <obd_support.h>
  41 #include <obd_cksum.h>
  42 #include <obd_class.h>
  43 #include <lustre_net.h>
  44 #include <lustre_sec.h>
  45
  46 #include "ptlrpc_internal.h"
  47
  48 struct plain_sec {
  49         struct ptlrpc_sec       pls_base;
  50         rwlock_t            pls_lock;
  51         struct ptlrpc_cli_ctx  *pls_ctx;
  52 };
  53
  54 static inline struct plain_sec *sec2plsec(struct ptlrpc_sec *sec)
  55 {
  56         return container_of(sec, struct plain_sec, pls_base);
  57 }
  58
  59 static struct ptlrpc_sec_policy plain_policy;
  60 static struct ptlrpc_ctx_ops    plain_ctx_ops;
  61 static struct ptlrpc_svc_ctx    plain_svc_ctx;
  62
  63 static unsigned int plain_at_offset;
  64
  65 /*
  66  * for simplicity, plain policy rpc use fixed layout.
  67  */
  68 #define PLAIN_PACK_SEGMENTS             (4)
  69
  70 #define PLAIN_PACK_HDR_OFF              (0)
  71 #define PLAIN_PACK_MSG_OFF              (1)
  72 #define PLAIN_PACK_USER_OFF             (2)
  73 #define PLAIN_PACK_BULK_OFF             (3)
  74
  75 #define PLAIN_FL_USER                   (0x01)
  76 #define PLAIN_FL_BULK                   (0x02)
  77
  78 struct plain_header {
  79         __u8            ph_ver;            /* 0 */
  80         __u8            ph_flags;
  81         __u8            ph_sp;             /* source */
  82         __u8            ph_bulk_hash_alg;  /* complete flavor desc */
  83         __u8            ph_pad[4];
  84 };
  85
  86 struct plain_bulk_token {
  87         __u8            pbt_hash[8];
  88 };
  89
  90 #define PLAIN_BSD_SIZE \
  91         (sizeof(struct ptlrpc_bulk_sec_desc) + sizeof(struct plain_bulk_token))
  92
  93 /****************************************
  94  * bulk checksum helpers                *
  95  ****************************************/
  96
  97 static int plain_unpack_bsd(struct lustre_msg *msg, int swabbed)
  98 {
  99         struct ptlrpc_bulk_sec_desc *bsd;
 100
 101         if (bulk_sec_desc_unpack(msg, PLAIN_PACK_BULK_OFF, swabbed))
 102                 return -EPROTO;
 103
 104         bsd = lustre_msg_buf(msg, PLAIN_PACK_BULK_OFF, PLAIN_BSD_SIZE);
 105         if (bsd == NULL) {
 106                 CERROR("bulk sec desc has short size %d\n",
 107                        lustre_msg_buflen(msg, PLAIN_PACK_BULK_OFF));
 108                 return -EPROTO;
 109         }
 110
 111         if (bsd->bsd_svc != SPTLRPC_BULK_SVC_NULL &&
 112             bsd->bsd_svc != SPTLRPC_BULK_SVC_INTG) {
 113                 CERROR("invalid bulk svc %u\n", bsd->bsd_svc);
 114                 return -EPROTO;
 115         }
 116
 117         return 0;
 118 }
 119
 120 static int plain_generate_bulk_csum(struct ptlrpc_bulk_desc *desc,
 121                                     __u8 hash_alg,
 122                                     struct plain_bulk_token *token)
 123 {
 124         if (hash_alg == BULK_HASH_ALG_NULL)
 125                 return 0;
 126
 127         memset(token->pbt_hash, 0, sizeof(token->pbt_hash));
 128         return sptlrpc_get_bulk_checksum(desc, hash_alg, token->pbt_hash,
 129                                          sizeof(token->pbt_hash));
 130 }
 131
 132 static int plain_verify_bulk_csum(struct ptlrpc_bulk_desc *desc,
 133                                   __u8 hash_alg,
 134                                   struct plain_bulk_token *tokenr)
 135 {
 136         struct plain_bulk_token tokenv;
 137         int                     rc;
 138
 139         if (hash_alg == BULK_HASH_ALG_NULL)
 140                 return 0;
 141
 142         memset(&tokenv.pbt_hash, 0, sizeof(tokenv.pbt_hash));
 143         rc = sptlrpc_get_bulk_checksum(desc, hash_alg, tokenv.pbt_hash,
 144                                        sizeof(tokenv.pbt_hash));
 145         if (rc)
 146                 return rc;
 147
 148         if (memcmp(tokenr->pbt_hash, tokenv.pbt_hash, sizeof(tokenr->pbt_hash)))
 149                 return -EACCES;
 150         return 0;
 151 }
 152
 153 static void corrupt_bulk_data(struct ptlrpc_bulk_desc *desc)
 154 {
 155         char           *ptr;
 156         unsigned int    off, i;
 157
 158         LASSERT(ptlrpc_is_bulk_desc_kiov(desc->bd_type));
 159
 160         for (i = 0; i < desc->bd_iov_count; i++) {
 161                 if (BD_GET_KIOV(desc, i).kiov_len == 0)
 162                         continue;
 163
 164                 ptr = kmap(BD_GET_KIOV(desc, i).kiov_page);
 165                 off = BD_GET_KIOV(desc, i).kiov_offset & ~PAGE_MASK;
 166                 ptr[off] ^= 0x1;
 167                 kunmap(BD_GET_KIOV(desc, i).kiov_page);
 168                 return;
 169         }
 170 }
 171
 172 /****************************************
 173  * cli_ctx apis                         *
 174  ****************************************/
 175
 176 static
 177 int plain_ctx_refresh(struct ptlrpc_cli_ctx *ctx)
 178 {
 179         /* should never reach here */
 180         LBUG();
 181         return 0;
 182 }
 183
 184 static
 185 int plain_ctx_validate(struct ptlrpc_cli_ctx *ctx)
 186 {
 187         return 0;
 188 }
 189
 190 static
 191 int plain_ctx_sign(struct ptlrpc_cli_ctx *ctx, struct ptlrpc_request *req)
 192 {
 193         struct lustre_msg   *msg = req->rq_reqbuf;
 194         struct plain_header *phdr;
 195         ENTRY;
 196
 197         msg->lm_secflvr = req->rq_flvr.sf_rpc;
 198
 199         phdr = lustre_msg_buf(msg, PLAIN_PACK_HDR_OFF, 0);
 200         phdr->ph_ver = 0;
 201         phdr->ph_flags = 0;
 202         phdr->ph_sp = ctx->cc_sec->ps_part;
 203         phdr->ph_bulk_hash_alg = req->rq_flvr.u_bulk.hash.hash_alg;
 204
 205         if (req->rq_pack_udesc)
 206                 phdr->ph_flags |= PLAIN_FL_USER;
 207         if (req->rq_pack_bulk)
 208                 phdr->ph_flags |= PLAIN_FL_BULK;
 209
 210         req->rq_reqdata_len = lustre_msg_size_v2(msg->lm_bufcount,
 211                                                  msg->lm_buflens);
 212         RETURN(0);
 213 }
 214
 215 static
 216 int plain_ctx_verify(struct ptlrpc_cli_ctx *ctx, struct ptlrpc_request *req)
 217 {
 218         struct lustre_msg *msg = req->rq_repdata;
 219         struct plain_header *phdr;
 220         __u32 cksum;
 221         bool swabbed;
 222
 223         ENTRY;
 224         if (msg->lm_bufcount != PLAIN_PACK_SEGMENTS) {
 225                 CERROR("unexpected reply buf count %u\n", msg->lm_bufcount);
 226                 RETURN(-EPROTO);
 227         }
 228
 229         swabbed = ptlrpc_rep_need_swab(req);
 230
 231         phdr = lustre_msg_buf(msg, PLAIN_PACK_HDR_OFF, sizeof(*phdr));
 232         if (phdr == NULL) {
 233                 CERROR("missing plain header\n");
 234                 RETURN(-EPROTO);
 235         }
 236
 237         if (phdr->ph_ver != 0) {
 238                 CERROR("Invalid header version\n");
 239                 RETURN(-EPROTO);
 240         }
 241
 242         /* expect no user desc in reply */
 243         if (phdr->ph_flags & PLAIN_FL_USER) {
 244                 CERROR("Unexpected udesc flag in reply\n");
 245                 RETURN(-EPROTO);
 246         }
 247
 248         if (phdr->ph_bulk_hash_alg != req->rq_flvr.u_bulk.hash.hash_alg) {
 249                 CERROR("reply bulk flavor %u != %u\n", phdr->ph_bulk_hash_alg,
 250                        req->rq_flvr.u_bulk.hash.hash_alg);
 251                 RETURN(-EPROTO);
 252         }
 253
 254         if (unlikely(req->rq_early)) {
 255                 unsigned int hsize = 4;
 256
 257                 cfs_crypto_hash_digest(CFS_HASH_ALG_CRC32,
 258                                 lustre_msg_buf(msg, PLAIN_PACK_MSG_OFF, 0),
 259                                 lustre_msg_buflen(msg, PLAIN_PACK_MSG_OFF),
 260                                 NULL, 0, (unsigned char *)&cksum, &hsize);
 261                 if (cksum != msg->lm_cksum) {
 262                         CDEBUG(D_SEC,
 263                                "early reply checksum mismatch: %08x != %08x\n",
 264                                cpu_to_le32(cksum), msg->lm_cksum);
 265                         RETURN(-EINVAL);
 266                 }
 267         } else {
 268                 /* whether we sent with bulk or not, we expect the same
 269                  * in reply, except for early reply */
 270                 if (!req->rq_early &&
 271                     !equi(req->rq_pack_bulk == 1,
 272                           phdr->ph_flags & PLAIN_FL_BULK)) {
 273                         CERROR("%s bulk checksum in reply\n",
 274                                req->rq_pack_bulk ? "Missing" : "Unexpected");
 275                         RETURN(-EPROTO);
 276                 }
 277
 278                 if (phdr->ph_flags & PLAIN_FL_BULK) {
 279                         if (plain_unpack_bsd(msg, swabbed))
 280                                 RETURN(-EPROTO);
 281                 }
 282         }
 283
 284         req->rq_repmsg = lustre_msg_buf(msg, PLAIN_PACK_MSG_OFF, 0);
 285         req->rq_replen = lustre_msg_buflen(msg, PLAIN_PACK_MSG_OFF);
 286         RETURN(0);
 287 }
 288
 289 static
 290 int plain_cli_wrap_bulk(struct ptlrpc_cli_ctx *ctx,
 291                         struct ptlrpc_request *req,
 292                         struct ptlrpc_bulk_desc *desc)
 293 {
 294         struct ptlrpc_bulk_sec_desc *bsd;
 295         struct plain_bulk_token     *token;
 296         int                          rc;
 297
 298         LASSERT(req->rq_pack_bulk);
 299         LASSERT(req->rq_reqbuf->lm_bufcount == PLAIN_PACK_SEGMENTS);
 300
 301         bsd = lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_BULK_OFF, 0);
 302         token = (struct plain_bulk_token *) bsd->bsd_data;
 303
 304         bsd->bsd_version = 0;
 305         bsd->bsd_flags = 0;
 306         bsd->bsd_type = SPTLRPC_BULK_DEFAULT;
 307         bsd->bsd_svc = SPTLRPC_FLVR_BULK_SVC(req->rq_flvr.sf_rpc);
 308
 309         if (bsd->bsd_svc == SPTLRPC_BULK_SVC_NULL)
 310                 RETURN(0);
 311
 312         if (req->rq_bulk_read)
 313                 RETURN(0);
 314
 315         rc = plain_generate_bulk_csum(desc, req->rq_flvr.u_bulk.hash.hash_alg,
 316                                       token);
 317         if (rc) {
 318                 CERROR("bulk write: failed to compute checksum: %d\n", rc);
 319         } else {
 320                 /*
 321                  * for sending we only compute the wrong checksum instead
 322                  * of corrupting the data so it is still correct on a redo
 323                  */
 324                 if (OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_SEND) &&
 325                     req->rq_flvr.u_bulk.hash.hash_alg != BULK_HASH_ALG_NULL)
 326                         token->pbt_hash[0] ^= 0x1;
 327         }
 328
 329         return rc;
 330 }
 331
 332 static
 333 int plain_cli_unwrap_bulk(struct ptlrpc_cli_ctx *ctx,
 334                           struct ptlrpc_request *req,
 335                           struct ptlrpc_bulk_desc *desc)
 336 {
 337         struct ptlrpc_bulk_sec_desc *bsdv;
 338         struct plain_bulk_token     *tokenv;
 339         int                          rc;
 340         int                          i, nob;
 341
 342         LASSERT(ptlrpc_is_bulk_desc_kiov(desc->bd_type));
 343         LASSERT(req->rq_pack_bulk);
 344         LASSERT(req->rq_reqbuf->lm_bufcount == PLAIN_PACK_SEGMENTS);
 345         LASSERT(req->rq_repdata->lm_bufcount == PLAIN_PACK_SEGMENTS);
 346
 347         bsdv = lustre_msg_buf(req->rq_repdata, PLAIN_PACK_BULK_OFF, 0);
 348         tokenv = (struct plain_bulk_token *) bsdv->bsd_data;
 349
 350         if (req->rq_bulk_write) {
 351                 if (bsdv->bsd_flags & BSD_FL_ERR)
 352                         return -EIO;
 353                 return 0;
 354         }
 355
 356         /* fix the actual data size */
 357         for (i = 0, nob = 0; i < desc->bd_iov_count; i++) {
 358                 if (BD_GET_KIOV(desc, i).kiov_len +
 359                     nob > desc->bd_nob_transferred) {
 360                         BD_GET_KIOV(desc, i).kiov_len =
 361                                 desc->bd_nob_transferred - nob;
 362                 }
 363                 nob += BD_GET_KIOV(desc, i).kiov_len;
 364         }
 365
 366         rc = plain_verify_bulk_csum(desc, req->rq_flvr.u_bulk.hash.hash_alg,
 367                                     tokenv);
 368         if (rc)
 369                 CERROR("bulk read: client verify failed: %d\n", rc);
 370
 371         return rc;
 372 }
 373
 374 /****************************************
 375  * sec apis                             *
 376  ****************************************/
 377
 378 static
 379 struct ptlrpc_cli_ctx *plain_sec_install_ctx(struct plain_sec *plsec)
 380 {
 381         struct ptlrpc_cli_ctx  *ctx, *ctx_new;
 382
 383         OBD_ALLOC_PTR(ctx_new);
 384
 385         write_lock(&plsec->pls_lock);
 386
 387         ctx = plsec->pls_ctx;
 388         if (ctx) {
 389                 atomic_inc(&ctx->cc_refcount);
 390
 391                 if (ctx_new)
 392                         OBD_FREE_PTR(ctx_new);
 393         } else if (ctx_new) {
 394                 ctx = ctx_new;
 395
 396                 atomic_set(&ctx->cc_refcount, 1);       /* for cache */
 397                 ctx->cc_sec = &plsec->pls_base;
 398                 ctx->cc_ops = &plain_ctx_ops;
 399                 ctx->cc_expire = 0;
 400                 ctx->cc_flags = PTLRPC_CTX_CACHED | PTLRPC_CTX_UPTODATE;
 401                 ctx->cc_vcred.vc_uid = 0;
 402                 spin_lock_init(&ctx->cc_lock);
 403                 INIT_LIST_HEAD(&ctx->cc_req_list);
 404                 INIT_LIST_HEAD(&ctx->cc_gc_chain);
 405
 406                 plsec->pls_ctx = ctx;
 407                 atomic_inc(&plsec->pls_base.ps_nctx);
 408                 atomic_inc(&plsec->pls_base.ps_refcount);
 409
 410                 atomic_inc(&ctx->cc_refcount);  /* for caller */
 411         }
 412
 413         write_unlock(&plsec->pls_lock);
 414
 415         return ctx;
 416 }
 417
 418 static
 419 void plain_destroy_sec(struct ptlrpc_sec *sec)
 420 {
 421         struct plain_sec *plsec = sec2plsec(sec);
 422         ENTRY;
 423
 424         LASSERT(sec->ps_policy == &plain_policy);
 425         LASSERT(sec->ps_import);
 426         LASSERT(atomic_read(&sec->ps_refcount) == 0);
 427         LASSERT(atomic_read(&sec->ps_nctx) == 0);
 428         LASSERT(plsec->pls_ctx == NULL);
 429
 430         class_import_put(sec->ps_import);
 431
 432         OBD_FREE_PTR(plsec);
 433         EXIT;
 434 }
 435
 436 static
 437 void plain_kill_sec(struct ptlrpc_sec *sec)
 438 {
 439         sec->ps_dying = 1;
 440 }
 441
 442 static
 443 struct ptlrpc_sec *plain_create_sec(struct obd_import *imp,
 444                                     struct ptlrpc_svc_ctx *svc_ctx,
 445                                     struct sptlrpc_flavor *sf)
 446 {
 447         struct plain_sec       *plsec;
 448         struct ptlrpc_sec      *sec;
 449         struct ptlrpc_cli_ctx  *ctx;
 450         ENTRY;
 451
 452         LASSERT(SPTLRPC_FLVR_POLICY(sf->sf_rpc) == SPTLRPC_POLICY_PLAIN);
 453
 454         OBD_ALLOC_PTR(plsec);
 455         if (plsec == NULL)
 456                 RETURN(NULL);
 457
 458         /*
 459          * initialize plain_sec
 460          */
 461         rwlock_init(&plsec->pls_lock);
 462         plsec->pls_ctx = NULL;
 463
 464         sec = &plsec->pls_base;
 465         sec->ps_policy = &plain_policy;
 466         atomic_set(&sec->ps_refcount, 0);
 467         atomic_set(&sec->ps_nctx, 0);
 468         sec->ps_id = sptlrpc_get_next_secid();
 469         sec->ps_import = class_import_get(imp);
 470         sec->ps_flvr = *sf;
 471         spin_lock_init(&sec->ps_lock);
 472         INIT_LIST_HEAD(&sec->ps_gc_list);
 473         sec->ps_gc_interval = 0;
 474         sec->ps_gc_next = 0;
 475
 476         /* install ctx immediately if this is a reverse sec */
 477         if (svc_ctx) {
 478                 ctx = plain_sec_install_ctx(plsec);
 479                 if (ctx == NULL) {
 480                         plain_destroy_sec(sec);
 481                         RETURN(NULL);
 482                 }
 483                 sptlrpc_cli_ctx_put(ctx, 1);
 484         }
 485
 486         RETURN(sec);
 487 }
 488
 489 static
 490 struct ptlrpc_cli_ctx *plain_lookup_ctx(struct ptlrpc_sec *sec,
 491                                         struct vfs_cred *vcred,
 492                                         int create, int remove_dead)
 493 {
 494         struct plain_sec       *plsec = sec2plsec(sec);
 495         struct ptlrpc_cli_ctx  *ctx;
 496         ENTRY;
 497
 498         read_lock(&plsec->pls_lock);
 499         ctx = plsec->pls_ctx;
 500         if (ctx)
 501                 atomic_inc(&ctx->cc_refcount);
 502         read_unlock(&plsec->pls_lock);
 503
 504         if (unlikely(ctx == NULL))
 505                 ctx = plain_sec_install_ctx(plsec);
 506
 507         RETURN(ctx);
 508 }
 509
 510 static
 511 void plain_release_ctx(struct ptlrpc_sec *sec,
 512                        struct ptlrpc_cli_ctx *ctx, int sync)
 513 {
 514         LASSERT(atomic_read(&sec->ps_refcount) > 0);
 515         LASSERT(atomic_read(&sec->ps_nctx) > 0);
 516         LASSERT(atomic_read(&ctx->cc_refcount) == 0);
 517         LASSERT(ctx->cc_sec == sec);
 518
 519         OBD_FREE_PTR(ctx);
 520
 521         atomic_dec(&sec->ps_nctx);
 522         sptlrpc_sec_put(sec);
 523 }
 524
 525 static
 526 int plain_flush_ctx_cache(struct ptlrpc_sec *sec,
 527                           uid_t uid, int grace, int force)
 528 {
 529         struct plain_sec       *plsec = sec2plsec(sec);
 530         struct ptlrpc_cli_ctx  *ctx;
 531         ENTRY;
 532
 533         /* do nothing unless caller want to flush for 'all' */
 534         if (uid != -1)
 535                 RETURN(0);
 536
 537         write_lock(&plsec->pls_lock);
 538         ctx = plsec->pls_ctx;
 539         plsec->pls_ctx = NULL;
 540         write_unlock(&plsec->pls_lock);
 541
 542         if (ctx)
 543                 sptlrpc_cli_ctx_put(ctx, 1);
 544         RETURN(0);
 545 }
 546
 547 static
 548 int plain_alloc_reqbuf(struct ptlrpc_sec *sec,
 549                        struct ptlrpc_request *req,
 550                        int msgsize)
 551 {
 552         __u32 buflens[PLAIN_PACK_SEGMENTS] = { 0, };
 553         int   alloc_len;
 554         ENTRY;
 555
 556         buflens[PLAIN_PACK_HDR_OFF] = sizeof(struct plain_header);
 557         buflens[PLAIN_PACK_MSG_OFF] = msgsize;
 558
 559         if (req->rq_pack_udesc)
 560                 buflens[PLAIN_PACK_USER_OFF] = sptlrpc_current_user_desc_size();
 561
 562         if (req->rq_pack_bulk) {
 563                 LASSERT(req->rq_bulk_read || req->rq_bulk_write);
 564                 buflens[PLAIN_PACK_BULK_OFF] = PLAIN_BSD_SIZE;
 565         }
 566
 567         alloc_len = lustre_msg_size_v2(PLAIN_PACK_SEGMENTS, buflens);
 568
 569         if (!req->rq_reqbuf) {
 570                 LASSERT(!req->rq_pool);
 571
 572                 alloc_len = size_roundup_power2(alloc_len);
 573                 OBD_ALLOC_LARGE(req->rq_reqbuf, alloc_len);
 574                 if (!req->rq_reqbuf)
 575                         RETURN(-ENOMEM);
 576
 577                 req->rq_reqbuf_len = alloc_len;
 578         } else {
 579                 LASSERT(req->rq_pool);
 580                 LASSERT(req->rq_reqbuf_len >= alloc_len);
 581                 memset(req->rq_reqbuf, 0, alloc_len);
 582         }
 583
 584         lustre_init_msg_v2(req->rq_reqbuf, PLAIN_PACK_SEGMENTS, buflens, NULL);
 585         req->rq_reqmsg = lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_MSG_OFF, 0);
 586
 587         if (req->rq_pack_udesc)
 588                 sptlrpc_pack_user_desc(req->rq_reqbuf, PLAIN_PACK_USER_OFF);
 589
 590         RETURN(0);
 591 }
 592
 593 static
 594 void plain_free_reqbuf(struct ptlrpc_sec *sec,
 595                        struct ptlrpc_request *req)
 596 {
 597         ENTRY;
 598         if (!req->rq_pool) {
 599                 OBD_FREE_LARGE(req->rq_reqbuf, req->rq_reqbuf_len);
 600                 req->rq_reqbuf = NULL;
 601                 req->rq_reqbuf_len = 0;
 602         }
 603         EXIT;
 604 }
 605
 606 static
 607 int plain_alloc_repbuf(struct ptlrpc_sec *sec,
 608                        struct ptlrpc_request *req,
 609                        int msgsize)
 610 {
 611         __u32 buflens[PLAIN_PACK_SEGMENTS] = { 0, };
 612         int alloc_len;
 613         ENTRY;
 614
 615         buflens[PLAIN_PACK_HDR_OFF] = sizeof(struct plain_header);
 616         buflens[PLAIN_PACK_MSG_OFF] = msgsize;
 617
 618         if (req->rq_pack_bulk) {
 619                 LASSERT(req->rq_bulk_read || req->rq_bulk_write);
 620                 buflens[PLAIN_PACK_BULK_OFF] = PLAIN_BSD_SIZE;
 621         }
 622
 623         alloc_len = lustre_msg_size_v2(PLAIN_PACK_SEGMENTS, buflens);
 624
 625         /* add space for early reply */
 626         alloc_len += plain_at_offset;
 627
 628         alloc_len = size_roundup_power2(alloc_len);
 629
 630         OBD_ALLOC_LARGE(req->rq_repbuf, alloc_len);
 631         if (!req->rq_repbuf)
 632                 RETURN(-ENOMEM);
 633
 634         req->rq_repbuf_len = alloc_len;
 635         RETURN(0);
 636 }
 637
 638 static
 639 void plain_free_repbuf(struct ptlrpc_sec *sec,
 640                        struct ptlrpc_request *req)
 641 {
 642         ENTRY;
 643         OBD_FREE_LARGE(req->rq_repbuf, req->rq_repbuf_len);
 644         req->rq_repbuf = NULL;
 645         req->rq_repbuf_len = 0;
 646         EXIT;
 647 }
 648
 649 static
 650 int plain_enlarge_reqbuf(struct ptlrpc_sec *sec,
 651                          struct ptlrpc_request *req,
 652                          int segment, int newsize)
 653 {
 654         struct lustre_msg      *newbuf;
 655         int                     oldsize;
 656         int                     newmsg_size, newbuf_size;
 657         ENTRY;
 658
 659         LASSERT(req->rq_reqbuf);
 660         LASSERT(req->rq_reqbuf_len >= req->rq_reqlen);
 661         LASSERT(lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_MSG_OFF, 0) ==
 662                 req->rq_reqmsg);
 663
 664         /* compute new embedded msg size.  */
 665         oldsize = req->rq_reqmsg->lm_buflens[segment];
 666         req->rq_reqmsg->lm_buflens[segment] = newsize;
 667         newmsg_size = lustre_msg_size_v2(req->rq_reqmsg->lm_bufcount,
 668                                          req->rq_reqmsg->lm_buflens);
 669         req->rq_reqmsg->lm_buflens[segment] = oldsize;
 670
 671         /* compute new wrapper msg size.  */
 672         oldsize = req->rq_reqbuf->lm_buflens[PLAIN_PACK_MSG_OFF];
 673         req->rq_reqbuf->lm_buflens[PLAIN_PACK_MSG_OFF] = newmsg_size;
 674         newbuf_size = lustre_msg_size_v2(req->rq_reqbuf->lm_bufcount,
 675                                          req->rq_reqbuf->lm_buflens);
 676         req->rq_reqbuf->lm_buflens[PLAIN_PACK_MSG_OFF] = oldsize;
 677
 678         /* request from pool should always have enough buffer */
 679         LASSERT(!req->rq_pool || req->rq_reqbuf_len >= newbuf_size);
 680
 681         if (req->rq_reqbuf_len < newbuf_size) {
 682                 newbuf_size = size_roundup_power2(newbuf_size);
 683
 684                 OBD_ALLOC_LARGE(newbuf, newbuf_size);
 685                 if (newbuf == NULL)
 686                         RETURN(-ENOMEM);
 687
 688                 /* Must lock this, so that otherwise unprotected change of
 689                  * rq_reqmsg is not racing with parallel processing of
 690                  * imp_replay_list traversing threads. See LU-3333
 691                  * This is a bandaid at best, we really need to deal with this
 692                  * in request enlarging code before unpacking that's already
 693                  * there */
 694                 if (req->rq_import)
 695                         spin_lock(&req->rq_import->imp_lock);
 696
 697                 memcpy(newbuf, req->rq_reqbuf, req->rq_reqbuf_len);
 698
 699                 OBD_FREE_LARGE(req->rq_reqbuf, req->rq_reqbuf_len);
 700                 req->rq_reqbuf = newbuf;
 701                 req->rq_reqbuf_len = newbuf_size;
 702                 req->rq_reqmsg = lustre_msg_buf(req->rq_reqbuf,
 703                                                 PLAIN_PACK_MSG_OFF, 0);
 704
 705                 if (req->rq_import)
 706                         spin_unlock(&req->rq_import->imp_lock);
 707         }
 708
 709         _sptlrpc_enlarge_msg_inplace(req->rq_reqbuf, PLAIN_PACK_MSG_OFF,
 710                                      newmsg_size);
 711         _sptlrpc_enlarge_msg_inplace(req->rq_reqmsg, segment, newsize);
 712
 713         req->rq_reqlen = newmsg_size;
 714         RETURN(0);
 715 }
 716
 717 /****************************************
 718  * service apis                         *
 719  ****************************************/
 720
 721 static struct ptlrpc_svc_ctx plain_svc_ctx = {
 722         .sc_refcount    = ATOMIC_INIT(1),
 723         .sc_policy      = &plain_policy,
 724 };
 725
 726 static int plain_accept(struct ptlrpc_request *req)
 727 {
 728         struct lustre_msg *msg = req->rq_reqbuf;
 729         struct plain_header *phdr;
 730         bool swabbed;
 731
 732         ENTRY;
 733         LASSERT(SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) ==
 734                 SPTLRPC_POLICY_PLAIN);
 735
 736         if (SPTLRPC_FLVR_BASE(req->rq_flvr.sf_rpc) !=
 737             SPTLRPC_FLVR_BASE(SPTLRPC_FLVR_PLAIN) ||
 738             SPTLRPC_FLVR_BULK_TYPE(req->rq_flvr.sf_rpc) !=
 739             SPTLRPC_FLVR_BULK_TYPE(SPTLRPC_FLVR_PLAIN)) {
 740                 CERROR("Invalid rpc flavor %x\n", req->rq_flvr.sf_rpc);
 741                 RETURN(SECSVC_DROP);
 742         }
 743
 744         if (msg->lm_bufcount < PLAIN_PACK_SEGMENTS) {
 745                 CERROR("unexpected request buf count %u\n", msg->lm_bufcount);
 746                 RETURN(SECSVC_DROP);
 747         }
 748
 749         swabbed = ptlrpc_req_need_swab(req);
 750
 751         phdr = lustre_msg_buf(msg, PLAIN_PACK_HDR_OFF, sizeof(*phdr));
 752         if (phdr == NULL) {
 753                 CERROR("missing plain header\n");
 754                 RETURN(-EPROTO);
 755         }
 756
 757         if (phdr->ph_ver != 0) {
 758                 CERROR("Invalid header version\n");
 759                 RETURN(-EPROTO);
 760         }
 761
 762         if (phdr->ph_bulk_hash_alg >= BULK_HASH_ALG_MAX) {
 763                 CERROR("invalid hash algorithm: %u\n", phdr->ph_bulk_hash_alg);
 764                 RETURN(-EPROTO);
 765         }
 766
 767         req->rq_sp_from = phdr->ph_sp;
 768         req->rq_flvr.u_bulk.hash.hash_alg = phdr->ph_bulk_hash_alg;
 769
 770         if (phdr->ph_flags & PLAIN_FL_USER) {
 771                 if (sptlrpc_unpack_user_desc(msg, PLAIN_PACK_USER_OFF,
 772                                              swabbed)) {
 773                         CERROR("Mal-formed user descriptor\n");
 774                         RETURN(SECSVC_DROP);
 775                 }
 776
 777                 req->rq_pack_udesc = 1;
 778                 req->rq_user_desc = lustre_msg_buf(msg, PLAIN_PACK_USER_OFF, 0);
 779         }
 780
 781         if (phdr->ph_flags & PLAIN_FL_BULK) {
 782                 if (plain_unpack_bsd(msg, swabbed))
 783                         RETURN(SECSVC_DROP);
 784
 785                 req->rq_pack_bulk = 1;
 786         }
 787
 788         req->rq_reqmsg = lustre_msg_buf(msg, PLAIN_PACK_MSG_OFF, 0);
 789         req->rq_reqlen = msg->lm_buflens[PLAIN_PACK_MSG_OFF];
 790
 791         req->rq_svc_ctx = &plain_svc_ctx;
 792         atomic_inc(&req->rq_svc_ctx->sc_refcount);
 793
 794         RETURN(SECSVC_OK);
 795 }
 796
 797 static
 798 int plain_alloc_rs(struct ptlrpc_request *req, int msgsize)
 799 {
 800         struct ptlrpc_reply_state   *rs;
 801         __u32                        buflens[PLAIN_PACK_SEGMENTS] = { 0, };
 802         int                          rs_size = sizeof(*rs);
 803         ENTRY;
 804
 805         LASSERT(msgsize % 8 == 0);
 806
 807         buflens[PLAIN_PACK_HDR_OFF] = sizeof(struct plain_header);
 808         buflens[PLAIN_PACK_MSG_OFF] = msgsize;
 809
 810         if (req->rq_pack_bulk && (req->rq_bulk_read || req->rq_bulk_write))
 811                 buflens[PLAIN_PACK_BULK_OFF] = PLAIN_BSD_SIZE;
 812
 813         rs_size += lustre_msg_size_v2(PLAIN_PACK_SEGMENTS, buflens);
 814
 815         rs = req->rq_reply_state;
 816
 817         if (rs) {
 818                 /* pre-allocated */
 819                 LASSERT(rs->rs_size >= rs_size);
 820         } else {
 821                 OBD_ALLOC_LARGE(rs, rs_size);
 822                 if (rs == NULL)
 823                         RETURN(-ENOMEM);
 824
 825                 rs->rs_size = rs_size;
 826         }
 827
 828         rs->rs_svc_ctx = req->rq_svc_ctx;
 829         atomic_inc(&req->rq_svc_ctx->sc_refcount);
 830         rs->rs_repbuf = (struct lustre_msg *) (rs + 1);
 831         rs->rs_repbuf_len = rs_size - sizeof(*rs);
 832
 833         lustre_init_msg_v2(rs->rs_repbuf, PLAIN_PACK_SEGMENTS, buflens, NULL);
 834         rs->rs_msg = lustre_msg_buf_v2(rs->rs_repbuf, PLAIN_PACK_MSG_OFF, 0);
 835
 836         req->rq_reply_state = rs;
 837         RETURN(0);
 838 }
 839
 840 static
 841 void plain_free_rs(struct ptlrpc_reply_state *rs)
 842 {
 843         ENTRY;
 844
 845         LASSERT(atomic_read(&rs->rs_svc_ctx->sc_refcount) > 1);
 846         atomic_dec(&rs->rs_svc_ctx->sc_refcount);
 847
 848         if (!rs->rs_prealloc)
 849                 OBD_FREE_LARGE(rs, rs->rs_size);
 850         EXIT;
 851 }
 852
 853 static
 854 int plain_authorize(struct ptlrpc_request *req)
 855 {
 856         struct ptlrpc_reply_state *rs = req->rq_reply_state;
 857         struct lustre_msg_v2      *msg = rs->rs_repbuf;
 858         struct plain_header       *phdr;
 859         int                        len;
 860         ENTRY;
 861
 862         LASSERT(rs);
 863         LASSERT(msg);
 864
 865         if (req->rq_replen != msg->lm_buflens[PLAIN_PACK_MSG_OFF])
 866                 len = lustre_shrink_msg(msg, PLAIN_PACK_MSG_OFF,
 867                                         req->rq_replen, 1);
 868         else
 869                 len = lustre_msg_size_v2(msg->lm_bufcount, msg->lm_buflens);
 870
 871         msg->lm_secflvr = req->rq_flvr.sf_rpc;
 872
 873         phdr = lustre_msg_buf(msg, PLAIN_PACK_HDR_OFF, 0);
 874         phdr->ph_ver = 0;
 875         phdr->ph_flags = 0;
 876         phdr->ph_bulk_hash_alg = req->rq_flvr.u_bulk.hash.hash_alg;
 877
 878         if (req->rq_pack_bulk)
 879                 phdr->ph_flags |= PLAIN_FL_BULK;
 880
 881         rs->rs_repdata_len = len;
 882
 883         if (likely(req->rq_packed_final)) {
 884                 if (lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)
 885                         req->rq_reply_off = plain_at_offset;
 886                 else
 887                         req->rq_reply_off = 0;
 888         } else {
 889                 unsigned int hsize = 4;
 890
 891                 cfs_crypto_hash_digest(CFS_HASH_ALG_CRC32,
 892                         lustre_msg_buf(msg, PLAIN_PACK_MSG_OFF, 0),
 893                         lustre_msg_buflen(msg, PLAIN_PACK_MSG_OFF),
 894                         NULL, 0, (unsigned char *)&msg->lm_cksum, &hsize);
 895                 req->rq_reply_off = 0;
 896         }
 897
 898         RETURN(0);
 899 }
 900
 901 static
 902 int plain_svc_unwrap_bulk(struct ptlrpc_request *req,
 903                           struct ptlrpc_bulk_desc *desc)
 904 {
 905         struct ptlrpc_reply_state   *rs = req->rq_reply_state;
 906         struct ptlrpc_bulk_sec_desc *bsdr, *bsdv;
 907         struct plain_bulk_token     *tokenr;
 908         int                          rc;
 909
 910         LASSERT(req->rq_bulk_write);
 911         LASSERT(req->rq_pack_bulk);
 912
 913         bsdr = lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_BULK_OFF, 0);
 914         tokenr = (struct plain_bulk_token *) bsdr->bsd_data;
 915         bsdv = lustre_msg_buf(rs->rs_repbuf, PLAIN_PACK_BULK_OFF, 0);
 916
 917         bsdv->bsd_version = 0;
 918         bsdv->bsd_type = SPTLRPC_BULK_DEFAULT;
 919         bsdv->bsd_svc = bsdr->bsd_svc;
 920         bsdv->bsd_flags = 0;
 921
 922         if (bsdr->bsd_svc == SPTLRPC_BULK_SVC_NULL)
 923                 return 0;
 924
 925         rc = plain_verify_bulk_csum(desc, req->rq_flvr.u_bulk.hash.hash_alg,
 926                                     tokenr);
 927         if (rc) {
 928                 bsdv->bsd_flags |= BSD_FL_ERR;
 929                 CERROR("bulk write: server verify failed: %d\n", rc);
 930         }
 931
 932         return rc;
 933 }
 934
 935 static
 936 int plain_svc_wrap_bulk(struct ptlrpc_request *req,
 937                         struct ptlrpc_bulk_desc *desc)
 938 {
 939         struct ptlrpc_reply_state   *rs = req->rq_reply_state;
 940         struct ptlrpc_bulk_sec_desc *bsdr, *bsdv;
 941         struct plain_bulk_token     *tokenv;
 942         int                          rc;
 943
 944         LASSERT(req->rq_bulk_read);
 945         LASSERT(req->rq_pack_bulk);
 946
 947         bsdr = lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_BULK_OFF, 0);
 948         bsdv = lustre_msg_buf(rs->rs_repbuf, PLAIN_PACK_BULK_OFF, 0);
 949         tokenv = (struct plain_bulk_token *) bsdv->bsd_data;
 950
 951         bsdv->bsd_version = 0;
 952         bsdv->bsd_type = SPTLRPC_BULK_DEFAULT;
 953         bsdv->bsd_svc = bsdr->bsd_svc;
 954         bsdv->bsd_flags = 0;
 955
 956         if (bsdr->bsd_svc == SPTLRPC_BULK_SVC_NULL)
 957                 return 0;
 958
 959         rc = plain_generate_bulk_csum(desc, req->rq_flvr.u_bulk.hash.hash_alg,
 960                                       tokenv);
 961         if (rc) {
 962                 CERROR("bulk read: server failed to compute "
 963                        "checksum: %d\n", rc);
 964         } else {
 965                 if (OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_RECEIVE))
 966                         corrupt_bulk_data(desc);
 967         }
 968
 969         return rc;
 970 }
 971
 972 static struct ptlrpc_ctx_ops plain_ctx_ops = {
 973         .refresh                = plain_ctx_refresh,
 974         .validate               = plain_ctx_validate,
 975         .sign                   = plain_ctx_sign,
 976         .verify                 = plain_ctx_verify,
 977         .wrap_bulk              = plain_cli_wrap_bulk,
 978         .unwrap_bulk            = plain_cli_unwrap_bulk,
 979 };
 980
 981 static struct ptlrpc_sec_cops plain_sec_cops = {
 982         .create_sec             = plain_create_sec,
 983         .destroy_sec            = plain_destroy_sec,
 984         .kill_sec               = plain_kill_sec,
 985         .lookup_ctx             = plain_lookup_ctx,
 986         .release_ctx            = plain_release_ctx,
 987         .flush_ctx_cache        = plain_flush_ctx_cache,
 988         .alloc_reqbuf           = plain_alloc_reqbuf,
 989         .free_reqbuf            = plain_free_reqbuf,
 990         .alloc_repbuf           = plain_alloc_repbuf,
 991         .free_repbuf            = plain_free_repbuf,
 992         .enlarge_reqbuf         = plain_enlarge_reqbuf,
 993 };
 994
 995 static struct ptlrpc_sec_sops plain_sec_sops = {
 996         .accept                 = plain_accept,
 997         .alloc_rs               = plain_alloc_rs,
 998         .authorize              = plain_authorize,
 999         .free_rs                = plain_free_rs,
1000         .unwrap_bulk            = plain_svc_unwrap_bulk,
1001         .wrap_bulk              = plain_svc_wrap_bulk,
1002 };
1003
1004 static struct ptlrpc_sec_policy plain_policy = {
1005         .sp_owner               = THIS_MODULE,
1006         .sp_name                = "plain",
1007         .sp_policy              = SPTLRPC_POLICY_PLAIN,
1008         .sp_cops                = &plain_sec_cops,
1009         .sp_sops                = &plain_sec_sops,
1010 };
1011
1012 int sptlrpc_plain_init(void)
1013 {
1014         __u32 buflens[PLAIN_PACK_SEGMENTS] = { 0, };
1015         int rc;
1016
1017         buflens[PLAIN_PACK_MSG_OFF] = lustre_msg_early_size();
1018         plain_at_offset = lustre_msg_size_v2(PLAIN_PACK_SEGMENTS, buflens);
1019
1020         rc = sptlrpc_register_policy(&plain_policy);
1021         if (rc)
1022                 CERROR("failed to register: %d\n", rc);
1023
1024         return rc;
1025 }
1026
1027 void sptlrpc_plain_fini(void)
1028 {
1029         int rc;
1030
1031         rc = sptlrpc_unregister_policy(&plain_policy);
1032         if (rc)
1033                 CERROR("cannot unregister: %d\n", rc);
1034 }