lustre/ptlrpc/gss/gss_krb5_mech.c

   1 /*
   2  * Modifications for Lustre
   3  *
   4  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
   5  *
   6  * Copyright (c) 2011, Whamcloud, Inc.
   7  *
   8  * Author: Eric Mei <ericm@clusterfs.com>
   9  */
  10
  11 /*
  12  *  linux/net/sunrpc/gss_krb5_mech.c
  13  *  linux/net/sunrpc/gss_krb5_crypto.c
  14  *  linux/net/sunrpc/gss_krb5_seal.c
  15  *  linux/net/sunrpc/gss_krb5_seqnum.c
  16  *  linux/net/sunrpc/gss_krb5_unseal.c
  17  *
  18  *  Copyright (c) 2001 The Regents of the University of Michigan.
  19  *  All rights reserved.
  20  *
  21  *  Andy Adamson <andros@umich.edu>
  22  *  J. Bruce Fields <bfields@umich.edu>
  23  *
  24  *  Redistribution and use in source and binary forms, with or without
  25  *  modification, are permitted provided that the following conditions
  26  *  are met:
  27  *
  28  *  1. Redistributions of source code must retain the above copyright
  29  *     notice, this list of conditions and the following disclaimer.
  30  *  2. Redistributions in binary form must reproduce the above copyright
  31  *     notice, this list of conditions and the following disclaimer in the
  32  *     documentation and/or other materials provided with the distribution.
  33  *  3. Neither the name of the University nor the names of its
  34  *     contributors may be used to endorse or promote products derived
  35  *     from this software without specific prior written permission.
  36  *
  37  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  38  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  39  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  40  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  41  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  42  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  43  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  44  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  45  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  46  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  47  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  48  *
  49  */
  50
  51 #define DEBUG_SUBSYSTEM S_SEC
  52 #ifdef __KERNEL__
  53 #include <linux/init.h>
  54 #include <linux/module.h>
  55 #include <linux/slab.h>
  56 #include <linux/crypto.h>
  57 #include <linux/mutex.h>
  58 #else
  59 #include <liblustre.h>
  60 #endif
  61
  62 #include <obd.h>
  63 #include <obd_class.h>
  64 #include <obd_support.h>
  65 #include <lustre/lustre_idl.h>
  66 #include <lustre_net.h>
  67 #include <lustre_import.h>
  68 #include <lustre_sec.h>
  69
  70 #include "gss_err.h"
  71 #include "gss_internal.h"
  72 #include "gss_api.h"
  73 #include "gss_asn1.h"
  74 #include "gss_krb5.h"
  75
  76 static spinlock_t krb5_seq_lock;
  77
  78 struct krb5_enctype {
  79         char           *ke_dispname;
  80         char           *ke_enc_name;            /* linux tfm name */
  81         char           *ke_hash_name;           /* linux tfm name */
  82         int             ke_enc_mode;            /* linux tfm mode */
  83         int             ke_hash_size;           /* checksum size */
  84         int             ke_conf_size;           /* confounder size */
  85         unsigned int    ke_hash_hmac:1;         /* is hmac? */
  86 };
  87
  88 /*
  89  * NOTE: for aes128-cts and aes256-cts, MIT implementation use CTS encryption.
  90  * but currently we simply CBC with padding, because linux doesn't support CTS
  91  * yet. this need to be fixed in the future.
  92  */
  93 static struct krb5_enctype enctypes[] = {
  94         [ENCTYPE_DES_CBC_RAW] = {               /* des-cbc-md5 */
  95                 "des-cbc-md5",
  96                 "cbc(des)",
  97                 "md5",
  98                 0,
  99                 16,
 100                 8,
 101                 0,
 102         },
 103         [ENCTYPE_DES3_CBC_RAW] = {              /* des3-hmac-sha1 */
 104                 "des3-hmac-sha1",
 105                 "cbc(des3_ede)",
 106                 "hmac(sha1)",
 107                 0,
 108                 20,
 109                 8,
 110                 1,
 111         },
 112         [ENCTYPE_AES128_CTS_HMAC_SHA1_96] = {   /* aes128-cts */
 113                 "aes128-cts-hmac-sha1-96",
 114                 "cbc(aes)",
 115                 "hmac(sha1)",
 116                 0,
 117                 12,
 118                 16,
 119                 1,
 120         },
 121         [ENCTYPE_AES256_CTS_HMAC_SHA1_96] = {   /* aes256-cts */
 122                 "aes256-cts-hmac-sha1-96",
 123                 "cbc(aes)",
 124                 "hmac(sha1)",
 125                 0,
 126                 12,
 127                 16,
 128                 1,
 129         },
 130         [ENCTYPE_ARCFOUR_HMAC] = {              /* arcfour-hmac-md5 */
 131                 "arcfour-hmac-md5",
 132                 "ecb(arc4)",
 133                 "hmac(md5)",
 134                 0,
 135                 16,
 136                 8,
 137                 1,
 138         },
 139 };
 140
 141 #define MAX_ENCTYPES    sizeof(enctypes)/sizeof(struct krb5_enctype)
 142
 143 static const char * enctype2str(__u32 enctype)
 144 {
 145         if (enctype < MAX_ENCTYPES && enctypes[enctype].ke_dispname)
 146                 return enctypes[enctype].ke_dispname;
 147
 148         return "unknown";
 149 }
 150
 151 static
 152 int keyblock_init(struct krb5_keyblock *kb, char *alg_name, int alg_mode)
 153 {
 154         kb->kb_tfm = ll_crypto_alloc_blkcipher(alg_name, alg_mode, 0);
 155         if (IS_ERR(kb->kb_tfm)) {
 156                 CERROR("failed to alloc tfm: %s, mode %d\n",
 157                        alg_name, alg_mode);
 158                 return -1;
 159         }
 160
 161         if (ll_crypto_blkcipher_setkey(kb->kb_tfm, kb->kb_key.data, kb->kb_key.len)) {
 162                 CERROR("failed to set %s key, len %d\n",
 163                        alg_name, kb->kb_key.len);
 164                 return -1;
 165         }
 166
 167         return 0;
 168 }
 169
 170 static
 171 int krb5_init_keys(struct krb5_ctx *kctx)
 172 {
 173         struct krb5_enctype *ke;
 174
 175         if (kctx->kc_enctype >= MAX_ENCTYPES ||
 176             enctypes[kctx->kc_enctype].ke_hash_size == 0) {
 177                 CERROR("unsupported enctype %x\n", kctx->kc_enctype);
 178                 return -1;
 179         }
 180
 181         ke = &enctypes[kctx->kc_enctype];
 182
 183         /* tfm arc4 is stateful, user should alloc-use-free by his own */
 184         if (kctx->kc_enctype != ENCTYPE_ARCFOUR_HMAC &&
 185             keyblock_init(&kctx->kc_keye, ke->ke_enc_name, ke->ke_enc_mode))
 186                 return -1;
 187
 188         /* tfm hmac is stateful, user should alloc-use-free by his own */
 189         if (ke->ke_hash_hmac == 0 &&
 190             keyblock_init(&kctx->kc_keyi, ke->ke_enc_name, ke->ke_enc_mode))
 191                 return -1;
 192         if (ke->ke_hash_hmac == 0 &&
 193             keyblock_init(&kctx->kc_keyc, ke->ke_enc_name, ke->ke_enc_mode))
 194                 return -1;
 195
 196         return 0;
 197 }
 198
 199 static
 200 void keyblock_free(struct krb5_keyblock *kb)
 201 {
 202         rawobj_free(&kb->kb_key);
 203         if (kb->kb_tfm)
 204                 ll_crypto_free_blkcipher(kb->kb_tfm);
 205 }
 206
 207 static
 208 int keyblock_dup(struct krb5_keyblock *new, struct krb5_keyblock *kb)
 209 {
 210         return rawobj_dup(&new->kb_key, &kb->kb_key);
 211 }
 212
 213 static
 214 int get_bytes(char **ptr, const char *end, void *res, int len)
 215 {
 216         char *p, *q;
 217         p = *ptr;
 218         q = p + len;
 219         if (q > end || q < p)
 220                 return -1;
 221         memcpy(res, p, len);
 222         *ptr = q;
 223         return 0;
 224 }
 225
 226 static
 227 int get_rawobj(char **ptr, const char *end, rawobj_t *res)
 228 {
 229         char   *p, *q;
 230         __u32   len;
 231
 232         p = *ptr;
 233         if (get_bytes(&p, end, &len, sizeof(len)))
 234                 return -1;
 235
 236         q = p + len;
 237         if (q > end || q < p)
 238                 return -1;
 239
 240         OBD_ALLOC_LARGE(res->data, len);
 241         if (!res->data)
 242                 return -1;
 243
 244         res->len = len;
 245         memcpy(res->data, p, len);
 246         *ptr = q;
 247         return 0;
 248 }
 249
 250 static
 251 int get_keyblock(char **ptr, const char *end,
 252                  struct krb5_keyblock *kb, __u32 keysize)
 253 {
 254         char *buf;
 255
 256         OBD_ALLOC_LARGE(buf, keysize);
 257         if (buf == NULL)
 258                 return -1;
 259
 260         if (get_bytes(ptr, end, buf, keysize)) {
 261                 OBD_FREE_LARGE(buf, keysize);
 262                 return -1;
 263         }
 264
 265         kb->kb_key.len = keysize;
 266         kb->kb_key.data = buf;
 267         return 0;
 268 }
 269
 270 static
 271 void delete_context_kerberos(struct krb5_ctx *kctx)
 272 {
 273         rawobj_free(&kctx->kc_mech_used);
 274
 275         keyblock_free(&kctx->kc_keye);
 276         keyblock_free(&kctx->kc_keyi);
 277         keyblock_free(&kctx->kc_keyc);
 278 }
 279
 280 static
 281 __u32 import_context_rfc1964(struct krb5_ctx *kctx, char *p, char *end)
 282 {
 283         unsigned int    tmp_uint, keysize;
 284
 285         /* seed_init flag */
 286         if (get_bytes(&p, end, &tmp_uint, sizeof(tmp_uint)))
 287                 goto out_err;
 288         kctx->kc_seed_init = (tmp_uint != 0);
 289
 290         /* seed */
 291         if (get_bytes(&p, end, kctx->kc_seed, sizeof(kctx->kc_seed)))
 292                 goto out_err;
 293
 294         /* sign/seal algorithm, not really used now */
 295         if (get_bytes(&p, end, &tmp_uint, sizeof(tmp_uint)) ||
 296             get_bytes(&p, end, &tmp_uint, sizeof(tmp_uint)))
 297                 goto out_err;
 298
 299         /* end time */
 300         if (get_bytes(&p, end, &kctx->kc_endtime, sizeof(kctx->kc_endtime)))
 301                 goto out_err;
 302
 303         /* seq send */
 304         if (get_bytes(&p, end, &tmp_uint, sizeof(tmp_uint)))
 305                 goto out_err;
 306         kctx->kc_seq_send = tmp_uint;
 307
 308         /* mech oid */
 309         if (get_rawobj(&p, end, &kctx->kc_mech_used))
 310                 goto out_err;
 311
 312         /* old style enc/seq keys in format:
 313          *   - enctype (u32)
 314          *   - keysize (u32)
 315          *   - keydata
 316          * we decompose them to fit into the new context
 317          */
 318
 319         /* enc key */
 320         if (get_bytes(&p, end, &kctx->kc_enctype, sizeof(kctx->kc_enctype)))
 321                 goto out_err;
 322
 323         if (get_bytes(&p, end, &keysize, sizeof(keysize)))
 324                 goto out_err;
 325
 326         if (get_keyblock(&p, end, &kctx->kc_keye, keysize))
 327                 goto out_err;
 328
 329         /* seq key */
 330         if (get_bytes(&p, end, &tmp_uint, sizeof(tmp_uint)) ||
 331             tmp_uint != kctx->kc_enctype)
 332                 goto out_err;
 333
 334         if (get_bytes(&p, end, &tmp_uint, sizeof(tmp_uint)) ||
 335             tmp_uint != keysize)
 336                 goto out_err;
 337
 338         if (get_keyblock(&p, end, &kctx->kc_keyc, keysize))
 339                 goto out_err;
 340
 341         /* old style fallback */
 342         if (keyblock_dup(&kctx->kc_keyi, &kctx->kc_keyc))
 343                 goto out_err;
 344
 345         if (p != end)
 346                 goto out_err;
 347
 348         CDEBUG(D_SEC, "succesfully imported rfc1964 context\n");
 349         return 0;
 350 out_err:
 351         return GSS_S_FAILURE;
 352 }
 353
 354 /* Flags for version 2 context flags */
 355 #define KRB5_CTX_FLAG_INITIATOR         0x00000001
 356 #define KRB5_CTX_FLAG_CFX               0x00000002
 357 #define KRB5_CTX_FLAG_ACCEPTOR_SUBKEY   0x00000004
 358
 359 static
 360 __u32 import_context_rfc4121(struct krb5_ctx *kctx, char *p, char *end)
 361 {
 362         unsigned int    tmp_uint, keysize;
 363
 364         /* end time */
 365         if (get_bytes(&p, end, &kctx->kc_endtime, sizeof(kctx->kc_endtime)))
 366                 goto out_err;
 367
 368         /* flags */
 369         if (get_bytes(&p, end, &tmp_uint, sizeof(tmp_uint)))
 370                 goto out_err;
 371
 372         if (tmp_uint & KRB5_CTX_FLAG_INITIATOR)
 373                 kctx->kc_initiate = 1;
 374         if (tmp_uint & KRB5_CTX_FLAG_CFX)
 375                 kctx->kc_cfx = 1;
 376         if (tmp_uint & KRB5_CTX_FLAG_ACCEPTOR_SUBKEY)
 377                 kctx->kc_have_acceptor_subkey = 1;
 378
 379         /* seq send */
 380         if (get_bytes(&p, end, &kctx->kc_seq_send, sizeof(kctx->kc_seq_send)))
 381                 goto out_err;
 382
 383         /* enctype */
 384         if (get_bytes(&p, end, &kctx->kc_enctype, sizeof(kctx->kc_enctype)))
 385                 goto out_err;
 386
 387         /* size of each key */
 388         if (get_bytes(&p, end, &keysize, sizeof(keysize)))
 389                 goto out_err;
 390
 391         /* number of keys - should always be 3 */
 392         if (get_bytes(&p, end, &tmp_uint, sizeof(tmp_uint)))
 393                 goto out_err;
 394
 395         if (tmp_uint != 3) {
 396                 CERROR("Invalid number of keys: %u\n", tmp_uint);
 397                 goto out_err;
 398         }
 399
 400         /* ke */
 401         if (get_keyblock(&p, end, &kctx->kc_keye, keysize))
 402                 goto out_err;
 403         /* ki */
 404         if (get_keyblock(&p, end, &kctx->kc_keyi, keysize))
 405                 goto out_err;
 406         /* ki */
 407         if (get_keyblock(&p, end, &kctx->kc_keyc, keysize))
 408                 goto out_err;
 409
 410         CDEBUG(D_SEC, "succesfully imported v2 context\n");
 411         return 0;
 412 out_err:
 413         return GSS_S_FAILURE;
 414 }
 415
 416 /*
 417  * The whole purpose here is trying to keep user level gss context parsing
 418  * from nfs-utils unchanged as possible as we can, they are not quite mature
 419  * yet, and many stuff still not clear, like heimdal etc.
 420  */
 421 static
 422 __u32 gss_import_sec_context_kerberos(rawobj_t *inbuf,
 423                                       struct gss_ctx *gctx)
 424 {
 425         struct krb5_ctx *kctx;
 426         char            *p = (char *) inbuf->data;
 427         char            *end = (char *) (inbuf->data + inbuf->len);
 428         unsigned int     tmp_uint, rc;
 429
 430         if (get_bytes(&p, end, &tmp_uint, sizeof(tmp_uint))) {
 431                 CERROR("Fail to read version\n");
 432                 return GSS_S_FAILURE;
 433         }
 434
 435         /* only support 0, 1 for the moment */
 436         if (tmp_uint > 2) {
 437                 CERROR("Invalid version %u\n", tmp_uint);
 438                 return GSS_S_FAILURE;
 439         }
 440
 441         OBD_ALLOC_PTR(kctx);
 442         if (!kctx)
 443                 return GSS_S_FAILURE;
 444
 445         if (tmp_uint == 0 || tmp_uint == 1) {
 446                 kctx->kc_initiate = tmp_uint;
 447                 rc = import_context_rfc1964(kctx, p, end);
 448         } else {
 449                 rc = import_context_rfc4121(kctx, p, end);
 450         }
 451
 452         if (rc == 0)
 453                 rc = krb5_init_keys(kctx);
 454
 455         if (rc) {
 456                 delete_context_kerberos(kctx);
 457                 OBD_FREE_PTR(kctx);
 458
 459                 return GSS_S_FAILURE;
 460         }
 461
 462         gctx->internal_ctx_id = kctx;
 463         return GSS_S_COMPLETE;
 464 }
 465
 466 static
 467 __u32 gss_copy_reverse_context_kerberos(struct gss_ctx *gctx,
 468                                         struct gss_ctx *gctx_new)
 469 {
 470         struct krb5_ctx *kctx = gctx->internal_ctx_id;
 471         struct krb5_ctx *knew;
 472
 473         OBD_ALLOC_PTR(knew);
 474         if (!knew)
 475                 return GSS_S_FAILURE;
 476
 477         knew->kc_initiate = kctx->kc_initiate ? 0 : 1;
 478         knew->kc_cfx = kctx->kc_cfx;
 479         knew->kc_seed_init = kctx->kc_seed_init;
 480         knew->kc_have_acceptor_subkey = kctx->kc_have_acceptor_subkey;
 481         knew->kc_endtime = kctx->kc_endtime;
 482
 483         memcpy(knew->kc_seed, kctx->kc_seed, sizeof(kctx->kc_seed));
 484         knew->kc_seq_send = kctx->kc_seq_recv;
 485         knew->kc_seq_recv = kctx->kc_seq_send;
 486         knew->kc_enctype = kctx->kc_enctype;
 487
 488         if (rawobj_dup(&knew->kc_mech_used, &kctx->kc_mech_used))
 489                 goto out_err;
 490
 491         if (keyblock_dup(&knew->kc_keye, &kctx->kc_keye))
 492                 goto out_err;
 493         if (keyblock_dup(&knew->kc_keyi, &kctx->kc_keyi))
 494                 goto out_err;
 495         if (keyblock_dup(&knew->kc_keyc, &kctx->kc_keyc))
 496                 goto out_err;
 497         if (krb5_init_keys(knew))
 498                 goto out_err;
 499
 500         gctx_new->internal_ctx_id = knew;
 501         CDEBUG(D_SEC, "succesfully copied reverse context\n");
 502         return GSS_S_COMPLETE;
 503
 504 out_err:
 505         delete_context_kerberos(knew);
 506         OBD_FREE_PTR(knew);
 507         return GSS_S_FAILURE;
 508 }
 509
 510 static
 511 __u32 gss_inquire_context_kerberos(struct gss_ctx *gctx,
 512                                    unsigned long  *endtime)
 513 {
 514         struct krb5_ctx *kctx = gctx->internal_ctx_id;
 515
 516         *endtime = (unsigned long) ((__u32) kctx->kc_endtime);
 517         return GSS_S_COMPLETE;
 518 }
 519
 520 static
 521 void gss_delete_sec_context_kerberos(void *internal_ctx)
 522 {
 523         struct krb5_ctx *kctx = internal_ctx;
 524
 525         delete_context_kerberos(kctx);
 526         OBD_FREE_PTR(kctx);
 527 }
 528
 529 static
 530 void buf_to_sg(struct scatterlist *sg, void *ptr, int len)
 531 {
 532         sg->page = virt_to_page(ptr);
 533         sg->offset = offset_in_page(ptr);
 534         sg->length = len;
 535 }
 536
 537 static
 538 __u32 krb5_encrypt(struct ll_crypto_cipher *tfm,
 539                    int decrypt,
 540                    void * iv,
 541                    void * in,
 542                    void * out,
 543                    int length)
 544 {
 545         struct blkcipher_desc desc;
 546         struct scatterlist    sg;
 547         __u8 local_iv[16] = {0};
 548         __u32 ret = -EINVAL;
 549
 550         LASSERT(tfm);
 551         desc.tfm  = tfm;
 552         desc.info = local_iv;
 553         desc.flags= 0;
 554
 555         if (length % ll_crypto_blkcipher_blocksize(tfm) != 0) {
 556                 CERROR("output length %d mismatch blocksize %d\n",
 557                        length, ll_crypto_blkcipher_blocksize(tfm));
 558                 goto out;
 559         }
 560
 561         if (ll_crypto_blkcipher_ivsize(tfm) > 16) {
 562                 CERROR("iv size too large %d\n", ll_crypto_blkcipher_ivsize(tfm));
 563                 goto out;
 564         }
 565
 566         if (iv)
 567                 memcpy(local_iv, iv, ll_crypto_blkcipher_ivsize(tfm));
 568
 569         memcpy(out, in, length);
 570         buf_to_sg(&sg, out, length);
 571
 572         if (decrypt)
 573                 ret = ll_crypto_blkcipher_decrypt_iv(&desc, &sg, &sg, length);
 574         else
 575                 ret = ll_crypto_blkcipher_encrypt_iv(&desc, &sg, &sg, length);
 576
 577 out:
 578         return(ret);
 579 }
 580
 581 #ifdef HAVE_ASYNC_BLOCK_CIPHER
 582
 583 static inline
 584 int krb5_digest_hmac(struct ll_crypto_hash *tfm,
 585                      rawobj_t *key,
 586                      struct krb5_header *khdr,
 587                      int msgcnt, rawobj_t *msgs,
 588                      int iovcnt, lnet_kiov_t *iovs,
 589                      rawobj_t *cksum)
 590 {
 591         struct hash_desc   desc;
 592         struct scatterlist sg[1];
 593         int                i;
 594
 595         ll_crypto_hash_setkey(tfm, key->data, key->len);
 596         desc.tfm  = tfm;
 597         desc.flags= 0;
 598
 599         ll_crypto_hash_init(&desc);
 600
 601         for (i = 0; i < msgcnt; i++) {
 602                 if (msgs[i].len == 0)
 603                         continue;
 604                 buf_to_sg(sg, (char *) msgs[i].data, msgs[i].len);
 605                 ll_crypto_hash_update(&desc, sg, msgs[i].len);
 606         }
 607
 608         for (i = 0; i < iovcnt; i++) {
 609                 if (iovs[i].kiov_len == 0)
 610                         continue;
 611                 sg[0].page = iovs[i].kiov_page;
 612                 sg[0].offset = iovs[i].kiov_offset;
 613                 sg[0].length = iovs[i].kiov_len;
 614                 ll_crypto_hash_update(&desc, sg, iovs[i].kiov_len);
 615         }
 616
 617         if (khdr) {
 618                 buf_to_sg(sg, (char *) khdr, sizeof(*khdr));
 619                 ll_crypto_hash_update(&desc, sg, sizeof(*khdr));
 620         }
 621
 622         return ll_crypto_hash_final(&desc, cksum->data);
 623 }
 624
 625 #else /* ! HAVE_ASYNC_BLOCK_CIPHER */
 626
 627 static inline
 628 int krb5_digest_hmac(struct ll_crypto_hash *tfm,
 629                      rawobj_t *key,
 630                      struct krb5_header *khdr,
 631                      int msgcnt, rawobj_t *msgs,
 632                      int iovcnt, lnet_kiov_t *iovs,
 633                      rawobj_t *cksum)
 634 {
 635         struct scatterlist sg[1];
 636         __u32              keylen = key->len, i;
 637
 638         crypto_hmac_init(tfm, key->data, &keylen);
 639
 640         for (i = 0; i < msgcnt; i++) {
 641                 if (msgs[i].len == 0)
 642                         continue;
 643                 buf_to_sg(sg, (char *) msgs[i].data, msgs[i].len);
 644                 crypto_hmac_update(tfm, sg, 1);
 645         }
 646
 647         for (i = 0; i < iovcnt; i++) {
 648                 if (iovs[i].kiov_len == 0)
 649                         continue;
 650                 sg[0].page = iovs[i].kiov_page;
 651                 sg[0].offset = iovs[i].kiov_offset;
 652                 sg[0].length = iovs[i].kiov_len;
 653                 crypto_hmac_update(tfm, sg, 1);
 654         }
 655
 656         if (khdr) {
 657                 buf_to_sg(sg, (char *) khdr, sizeof(*khdr));
 658                 crypto_hmac_update(tfm, sg, 1);
 659         }
 660
 661         crypto_hmac_final(tfm, key->data, &keylen, cksum->data);
 662         return 0;
 663 }
 664
 665 #endif /* HAVE_ASYNC_BLOCK_CIPHER */
 666
 667 static inline
 668 int krb5_digest_norm(struct ll_crypto_hash *tfm,
 669                      struct krb5_keyblock *kb,
 670                      struct krb5_header *khdr,
 671                      int msgcnt, rawobj_t *msgs,
 672                      int iovcnt, lnet_kiov_t *iovs,
 673                      rawobj_t *cksum)
 674 {
 675         struct hash_desc   desc;
 676         struct scatterlist sg[1];
 677         int                i;
 678
 679         LASSERT(kb->kb_tfm);
 680         desc.tfm  = tfm;
 681         desc.flags= 0;
 682
 683         ll_crypto_hash_init(&desc);
 684
 685         for (i = 0; i < msgcnt; i++) {
 686                 if (msgs[i].len == 0)
 687                         continue;
 688                 buf_to_sg(sg, (char *) msgs[i].data, msgs[i].len);
 689                 ll_crypto_hash_update(&desc, sg, msgs[i].len);
 690         }
 691
 692         for (i = 0; i < iovcnt; i++) {
 693                 if (iovs[i].kiov_len == 0)
 694                         continue;
 695                 sg[0].page = iovs[i].kiov_page;
 696                 sg[0].offset = iovs[i].kiov_offset;
 697                 sg[0].length = iovs[i].kiov_len;
 698                 ll_crypto_hash_update(&desc, sg, iovs[i].kiov_len);
 699         }
 700
 701         if (khdr) {
 702                 buf_to_sg(sg, (char *) khdr, sizeof(*khdr));
 703                 ll_crypto_hash_update(&desc, sg, sizeof(*khdr));
 704         }
 705
 706         ll_crypto_hash_final(&desc, cksum->data);
 707
 708         return krb5_encrypt(kb->kb_tfm, 0, NULL, cksum->data,
 709                             cksum->data, cksum->len);
 710 }
 711
 712 /*
 713  * compute (keyed/keyless) checksum against the plain text which appended
 714  * with krb5 wire token header.
 715  */
 716 static
 717 __s32 krb5_make_checksum(__u32 enctype,
 718                          struct krb5_keyblock *kb,
 719                          struct krb5_header *khdr,
 720                          int msgcnt, rawobj_t *msgs,
 721                          int iovcnt, lnet_kiov_t *iovs,
 722                          rawobj_t *cksum)
 723 {
 724         struct krb5_enctype   *ke = &enctypes[enctype];
 725         struct ll_crypto_hash *tfm;
 726         __u32                  code = GSS_S_FAILURE;
 727         int                    rc;
 728
 729         if (!(tfm = ll_crypto_alloc_hash(ke->ke_hash_name, 0, 0))) {
 730                 CERROR("failed to alloc TFM: %s\n", ke->ke_hash_name);
 731                 return GSS_S_FAILURE;
 732         }
 733
 734         cksum->len = ll_crypto_hash_digestsize(tfm);
 735         OBD_ALLOC_LARGE(cksum->data, cksum->len);
 736         if (!cksum->data) {
 737                 cksum->len = 0;
 738                 goto out_tfm;
 739         }
 740
 741         if (ke->ke_hash_hmac)
 742                 rc = krb5_digest_hmac(tfm, &kb->kb_key,
 743                                       khdr, msgcnt, msgs, iovcnt, iovs, cksum);
 744         else
 745                 rc = krb5_digest_norm(tfm, kb,
 746                                       khdr, msgcnt, msgs, iovcnt, iovs, cksum);
 747
 748         if (rc == 0)
 749                 code = GSS_S_COMPLETE;
 750 out_tfm:
 751         ll_crypto_free_hash(tfm);
 752         return code;
 753 }
 754
 755 static void fill_krb5_header(struct krb5_ctx *kctx,
 756                              struct krb5_header *khdr,
 757                              int privacy)
 758 {
 759         unsigned char acceptor_flag;
 760
 761         acceptor_flag = kctx->kc_initiate ? 0 : FLAG_SENDER_IS_ACCEPTOR;
 762
 763         if (privacy) {
 764                 khdr->kh_tok_id = cpu_to_be16(KG_TOK_WRAP_MSG);
 765                 khdr->kh_flags = acceptor_flag | FLAG_WRAP_CONFIDENTIAL;
 766                 khdr->kh_ec = cpu_to_be16(0);
 767                 khdr->kh_rrc = cpu_to_be16(0);
 768         } else {
 769                 khdr->kh_tok_id = cpu_to_be16(KG_TOK_MIC_MSG);
 770                 khdr->kh_flags = acceptor_flag;
 771                 khdr->kh_ec = cpu_to_be16(0xffff);
 772                 khdr->kh_rrc = cpu_to_be16(0xffff);
 773         }
 774
 775         khdr->kh_filler = 0xff;
 776         spin_lock(&krb5_seq_lock);
 777         khdr->kh_seq = cpu_to_be64(kctx->kc_seq_send++);
 778         spin_unlock(&krb5_seq_lock);
 779 }
 780
 781 static __u32 verify_krb5_header(struct krb5_ctx *kctx,
 782                                 struct krb5_header *khdr,
 783                                 int privacy)
 784 {
 785         unsigned char acceptor_flag;
 786         __u16         tok_id, ec_rrc;
 787
 788         acceptor_flag = kctx->kc_initiate ? FLAG_SENDER_IS_ACCEPTOR : 0;
 789
 790         if (privacy) {
 791                 tok_id = KG_TOK_WRAP_MSG;
 792                 ec_rrc = 0x0;
 793         } else {
 794                 tok_id = KG_TOK_MIC_MSG;
 795                 ec_rrc = 0xffff;
 796         }
 797
 798         /* sanity checks */
 799         if (be16_to_cpu(khdr->kh_tok_id) != tok_id) {
 800                 CERROR("bad token id\n");
 801                 return GSS_S_DEFECTIVE_TOKEN;
 802         }
 803         if ((khdr->kh_flags & FLAG_SENDER_IS_ACCEPTOR) != acceptor_flag) {
 804                 CERROR("bad direction flag\n");
 805                 return GSS_S_BAD_SIG;
 806         }
 807         if (privacy && (khdr->kh_flags & FLAG_WRAP_CONFIDENTIAL) == 0) {
 808                 CERROR("missing confidential flag\n");
 809                 return GSS_S_BAD_SIG;
 810         }
 811         if (khdr->kh_filler != 0xff) {
 812                 CERROR("bad filler\n");
 813                 return GSS_S_DEFECTIVE_TOKEN;
 814         }
 815         if (be16_to_cpu(khdr->kh_ec) != ec_rrc ||
 816             be16_to_cpu(khdr->kh_rrc) != ec_rrc) {
 817                 CERROR("bad EC or RRC\n");
 818                 return GSS_S_DEFECTIVE_TOKEN;
 819         }
 820         return GSS_S_COMPLETE;
 821 }
 822
 823 static
 824 __u32 gss_get_mic_kerberos(struct gss_ctx *gctx,
 825                            int msgcnt,
 826                            rawobj_t *msgs,
 827                            int iovcnt,
 828                            lnet_kiov_t *iovs,
 829                            rawobj_t *token)
 830 {
 831         struct krb5_ctx     *kctx = gctx->internal_ctx_id;
 832         struct krb5_enctype *ke = &enctypes[kctx->kc_enctype];
 833         struct krb5_header  *khdr;
 834         rawobj_t             cksum = RAWOBJ_EMPTY;
 835
 836         /* fill krb5 header */
 837         LASSERT(token->len >= sizeof(*khdr));
 838         khdr = (struct krb5_header *) token->data;
 839         fill_krb5_header(kctx, khdr, 0);
 840
 841         /* checksum */
 842         if (krb5_make_checksum(kctx->kc_enctype, &kctx->kc_keyc,
 843                                khdr, msgcnt, msgs, iovcnt, iovs, &cksum))
 844                 return GSS_S_FAILURE;
 845
 846         LASSERT(cksum.len >= ke->ke_hash_size);
 847         LASSERT(token->len >= sizeof(*khdr) + ke->ke_hash_size);
 848         memcpy(khdr + 1, cksum.data + cksum.len - ke->ke_hash_size,
 849                ke->ke_hash_size);
 850
 851         token->len = sizeof(*khdr) + ke->ke_hash_size;
 852         rawobj_free(&cksum);
 853         return GSS_S_COMPLETE;
 854 }
 855
 856 static
 857 __u32 gss_verify_mic_kerberos(struct gss_ctx *gctx,
 858                               int msgcnt,
 859                               rawobj_t *msgs,
 860                               int iovcnt,
 861                               lnet_kiov_t *iovs,
 862                               rawobj_t *token)
 863 {
 864         struct krb5_ctx     *kctx = gctx->internal_ctx_id;
 865         struct krb5_enctype *ke = &enctypes[kctx->kc_enctype];
 866         struct krb5_header  *khdr;
 867         rawobj_t             cksum = RAWOBJ_EMPTY;
 868         __u32                major;
 869
 870         if (token->len < sizeof(*khdr)) {
 871                 CERROR("short signature: %u\n", token->len);
 872                 return GSS_S_DEFECTIVE_TOKEN;
 873         }
 874
 875         khdr = (struct krb5_header *) token->data;
 876
 877         major = verify_krb5_header(kctx, khdr, 0);
 878         if (major != GSS_S_COMPLETE) {
 879                 CERROR("bad krb5 header\n");
 880                 return major;
 881         }
 882
 883         if (token->len < sizeof(*khdr) + ke->ke_hash_size) {
 884                 CERROR("short signature: %u, require %d\n",
 885                        token->len, (int) sizeof(*khdr) + ke->ke_hash_size);
 886                 return GSS_S_FAILURE;
 887         }
 888
 889         if (krb5_make_checksum(kctx->kc_enctype, &kctx->kc_keyc,
 890                                khdr, msgcnt, msgs, iovcnt, iovs, &cksum)) {
 891                 CERROR("failed to make checksum\n");
 892                 return GSS_S_FAILURE;
 893         }
 894
 895         LASSERT(cksum.len >= ke->ke_hash_size);
 896         if (memcmp(khdr + 1, cksum.data + cksum.len - ke->ke_hash_size,
 897                    ke->ke_hash_size)) {
 898                 CERROR("checksum mismatch\n");
 899                 rawobj_free(&cksum);
 900                 return GSS_S_BAD_SIG;
 901         }
 902
 903         rawobj_free(&cksum);
 904         return GSS_S_COMPLETE;
 905 }
 906
 907 static
 908 int add_padding(rawobj_t *msg, int msg_buflen, int blocksize)
 909 {
 910         int padding;
 911
 912         padding = (blocksize - (msg->len & (blocksize - 1))) &
 913                   (blocksize - 1);
 914         if (!padding)
 915                 return 0;
 916
 917         if (msg->len + padding > msg_buflen) {
 918                 CERROR("bufsize %u too small: datalen %u, padding %u\n",
 919                         msg_buflen, msg->len, padding);
 920                 return -EINVAL;
 921         }
 922
 923         memset(msg->data + msg->len, padding, padding);
 924         msg->len += padding;
 925         return 0;
 926 }
 927
 928 static
 929 int krb5_encrypt_rawobjs(struct ll_crypto_cipher *tfm,
 930                          int mode_ecb,
 931                          int inobj_cnt,
 932                          rawobj_t *inobjs,
 933                          rawobj_t *outobj,
 934                          int enc)
 935 {
 936         struct blkcipher_desc desc;
 937         struct scatterlist    src, dst;
 938         __u8                  local_iv[16] = {0}, *buf;
 939         __u32                 datalen = 0;
 940         int                   i, rc;
 941         ENTRY;
 942
 943         buf = outobj->data;
 944         desc.tfm  = tfm;
 945         desc.info = local_iv;
 946         desc.flags = 0;
 947
 948         for (i = 0; i < inobj_cnt; i++) {
 949                 LASSERT(buf + inobjs[i].len <= outobj->data + outobj->len);
 950
 951                 buf_to_sg(&src, inobjs[i].data, inobjs[i].len);
 952                 buf_to_sg(&dst, buf, outobj->len - datalen);
 953
 954                 if (mode_ecb) {
 955                         if (enc)
 956                                 rc = ll_crypto_blkcipher_encrypt(
 957                                         &desc, &dst, &src, src.length);
 958                         else
 959                                 rc = ll_crypto_blkcipher_decrypt(
 960                                         &desc, &dst, &src, src.length);
 961                 } else {
 962                         if (enc)
 963                                 rc = ll_crypto_blkcipher_encrypt_iv(
 964                                         &desc, &dst, &src, src.length);
 965                         else
 966                                 rc = ll_crypto_blkcipher_decrypt_iv(
 967                                         &desc, &dst, &src, src.length);
 968                 }
 969
 970                 if (rc) {
 971                         CERROR("encrypt error %d\n", rc);
 972                         RETURN(rc);
 973                 }
 974
 975                 datalen += inobjs[i].len;
 976                 buf += inobjs[i].len;
 977         }
 978
 979         outobj->len = datalen;
 980         RETURN(0);
 981 }
 982
 983 /*
 984  * if adj_nob != 0, we adjust desc->bd_nob to the actual cipher text size.
 985  */
 986 static
 987 int krb5_encrypt_bulk(struct ll_crypto_cipher *tfm,
 988                       struct krb5_header *khdr,
 989                       char *confounder,
 990                       struct ptlrpc_bulk_desc *desc,
 991                       rawobj_t *cipher,
 992                       int adj_nob)
 993 {
 994         struct blkcipher_desc   ciph_desc;
 995         __u8                    local_iv[16] = {0};
 996         struct scatterlist      src, dst;
 997         int                     blocksize, i, rc, nob = 0;
 998
 999         LASSERT(desc->bd_iov_count);
1000         LASSERT(desc->bd_enc_iov);
1001
1002         blocksize = ll_crypto_blkcipher_blocksize(tfm);
1003         LASSERT(blocksize > 1);
1004         LASSERT(cipher->len == blocksize + sizeof(*khdr));
1005
1006         ciph_desc.tfm  = tfm;
1007         ciph_desc.info = local_iv;
1008         ciph_desc.flags = 0;
1009
1010         /* encrypt confounder */
1011         buf_to_sg(&src, confounder, blocksize);
1012         buf_to_sg(&dst, cipher->data, blocksize);
1013
1014         rc = ll_crypto_blkcipher_encrypt_iv(&ciph_desc, &dst, &src, blocksize);
1015         if (rc) {
1016                 CERROR("error to encrypt confounder: %d\n", rc);
1017                 return rc;
1018         }
1019
1020         /* encrypt clear pages */
1021         for (i = 0; i < desc->bd_iov_count; i++) {
1022                 src.page = desc->bd_iov[i].kiov_page;
1023                 src.offset = desc->bd_iov[i].kiov_offset;
1024                 src.length = (desc->bd_iov[i].kiov_len + blocksize - 1) &
1025                              (~(blocksize - 1));
1026
1027                 if (adj_nob)
1028                         nob += src.length;
1029
1030                 dst.page = desc->bd_enc_iov[i].kiov_page;
1031                 dst.offset = src.offset;
1032                 dst.length = src.length;
1033
1034                 desc->bd_enc_iov[i].kiov_offset = dst.offset;
1035                 desc->bd_enc_iov[i].kiov_len = dst.length;
1036
1037                 rc = ll_crypto_blkcipher_encrypt_iv(&ciph_desc, &dst, &src,
1038                                                     src.length);
1039                 if (rc) {
1040                         CERROR("error to encrypt page: %d\n", rc);
1041                         return rc;
1042                 }
1043         }
1044
1045         /* encrypt krb5 header */
1046         buf_to_sg(&src, khdr, sizeof(*khdr));
1047         buf_to_sg(&dst, cipher->data + blocksize, sizeof(*khdr));
1048
1049         rc = ll_crypto_blkcipher_encrypt_iv(&ciph_desc,
1050                                             &dst, &src, sizeof(*khdr));
1051         if (rc) {
1052                 CERROR("error to encrypt krb5 header: %d\n", rc);
1053                 return rc;
1054         }
1055
1056         if (adj_nob)
1057                 desc->bd_nob = nob;
1058
1059         return 0;
1060 }
1061
1062 /*
1063  * desc->bd_nob_transferred is the size of cipher text received.
1064  * desc->bd_nob is the target size of plain text supposed to be.
1065  *
1066  * if adj_nob != 0, we adjust each page's kiov_len to the actual
1067  * plain text size.
1068  * - for client read: we don't know data size for each page, so
1069  *   bd_iov[]->kiov_len is set to PAGE_SIZE, but actual data received might
1070  *   be smaller, so we need to adjust it according to bd_enc_iov[]->kiov_len.
1071  *   this means we DO NOT support the situation that server send an odd size
1072  *   data in a page which is not the last one.
1073  * - for server write: we knows exactly data size for each page being expected,
1074  *   thus kiov_len is accurate already, so we should not adjust it at all.
1075  *   and bd_enc_iov[]->kiov_len should be round_up(bd_iov[]->kiov_len) which
1076  *   should have been done by prep_bulk().
1077  */
1078 static
1079 int krb5_decrypt_bulk(struct ll_crypto_cipher *tfm,
1080                       struct krb5_header *khdr,
1081                       struct ptlrpc_bulk_desc *desc,
1082                       rawobj_t *cipher,
1083                       rawobj_t *plain,
1084                       int adj_nob)
1085 {
1086         struct blkcipher_desc   ciph_desc;
1087         __u8                    local_iv[16] = {0};
1088         struct scatterlist      src, dst;
1089         int                     ct_nob = 0, pt_nob = 0;
1090         int                     blocksize, i, rc;
1091
1092         LASSERT(desc->bd_iov_count);
1093         LASSERT(desc->bd_enc_iov);
1094         LASSERT(desc->bd_nob_transferred);
1095
1096         blocksize = ll_crypto_blkcipher_blocksize(tfm);
1097         LASSERT(blocksize > 1);
1098         LASSERT(cipher->len == blocksize + sizeof(*khdr));
1099
1100         ciph_desc.tfm  = tfm;
1101         ciph_desc.info = local_iv;
1102         ciph_desc.flags = 0;
1103
1104         if (desc->bd_nob_transferred % blocksize) {
1105                 CERROR("odd transferred nob: %d\n", desc->bd_nob_transferred);
1106                 return -EPROTO;
1107         }
1108
1109         /* decrypt head (confounder) */
1110         buf_to_sg(&src, cipher->data, blocksize);
1111         buf_to_sg(&dst, plain->data, blocksize);
1112
1113         rc = ll_crypto_blkcipher_decrypt_iv(&ciph_desc, &dst, &src, blocksize);
1114         if (rc) {
1115                 CERROR("error to decrypt confounder: %d\n", rc);
1116                 return rc;
1117         }
1118
1119         for (i = 0; i < desc->bd_iov_count && ct_nob < desc->bd_nob_transferred;
1120              i++) {
1121                 if (desc->bd_enc_iov[i].kiov_offset % blocksize != 0 ||
1122                     desc->bd_enc_iov[i].kiov_len % blocksize != 0) {
1123                         CERROR("page %d: odd offset %u len %u, blocksize %d\n",
1124                                i, desc->bd_enc_iov[i].kiov_offset,
1125                                desc->bd_enc_iov[i].kiov_len, blocksize);
1126                         return -EFAULT;
1127                 }
1128
1129                 if (adj_nob) {
1130                         if (ct_nob + desc->bd_enc_iov[i].kiov_len >
1131                             desc->bd_nob_transferred)
1132                                 desc->bd_enc_iov[i].kiov_len =
1133                                         desc->bd_nob_transferred - ct_nob;
1134
1135                         desc->bd_iov[i].kiov_len = desc->bd_enc_iov[i].kiov_len;
1136                         if (pt_nob + desc->bd_enc_iov[i].kiov_len >desc->bd_nob)
1137                                 desc->bd_iov[i].kiov_len = desc->bd_nob -pt_nob;
1138                 } else {
1139                         /* this should be guaranteed by LNET */
1140                         LASSERT(ct_nob + desc->bd_enc_iov[i].kiov_len <=
1141                                 desc->bd_nob_transferred);
1142                         LASSERT(desc->bd_iov[i].kiov_len <=
1143                                 desc->bd_enc_iov[i].kiov_len);
1144                 }
1145
1146                 if (desc->bd_enc_iov[i].kiov_len == 0)
1147                         continue;
1148
1149                 src.page = desc->bd_enc_iov[i].kiov_page;
1150                 src.offset = desc->bd_enc_iov[i].kiov_offset;
1151                 src.length = desc->bd_enc_iov[i].kiov_len;
1152
1153                 dst = src;
1154                 if (desc->bd_iov[i].kiov_len % blocksize == 0)
1155                         dst.page = desc->bd_iov[i].kiov_page;
1156
1157                 rc = ll_crypto_blkcipher_decrypt_iv(&ciph_desc, &dst, &src,
1158                                                     src.length);
1159                 if (rc) {
1160                         CERROR("error to decrypt page: %d\n", rc);
1161                         return rc;
1162                 }
1163
1164                 if (desc->bd_iov[i].kiov_len % blocksize != 0) {
1165                         memcpy(cfs_page_address(desc->bd_iov[i].kiov_page) +
1166                                desc->bd_iov[i].kiov_offset,
1167                                cfs_page_address(desc->bd_enc_iov[i].kiov_page) +
1168                                desc->bd_iov[i].kiov_offset,
1169                                desc->bd_iov[i].kiov_len);
1170                 }
1171
1172                 ct_nob += desc->bd_enc_iov[i].kiov_len;
1173                 pt_nob += desc->bd_iov[i].kiov_len;
1174         }
1175
1176         if (unlikely(ct_nob != desc->bd_nob_transferred)) {
1177                 CERROR("%d cipher text transferred but only %d decrypted\n",
1178                        desc->bd_nob_transferred, ct_nob);
1179                 return -EFAULT;
1180         }
1181
1182         if (unlikely(!adj_nob && pt_nob != desc->bd_nob)) {
1183                 CERROR("%d plain text expected but only %d received\n",
1184                        desc->bd_nob, pt_nob);
1185                 return -EFAULT;
1186         }
1187
1188         /* if needed, clear up the rest unused iovs */
1189         if (adj_nob)
1190                 while (i < desc->bd_iov_count)
1191                         desc->bd_iov[i++].kiov_len = 0;
1192
1193         /* decrypt tail (krb5 header) */
1194         buf_to_sg(&src, cipher->data + blocksize, sizeof(*khdr));
1195         buf_to_sg(&dst, cipher->data + blocksize, sizeof(*khdr));
1196
1197         rc = ll_crypto_blkcipher_decrypt_iv(&ciph_desc,
1198                                             &dst, &src, sizeof(*khdr));
1199         if (rc) {
1200                 CERROR("error to decrypt tail: %d\n", rc);
1201                 return rc;
1202         }
1203
1204         if (memcmp(cipher->data + blocksize, khdr, sizeof(*khdr))) {
1205                 CERROR("krb5 header doesn't match\n");
1206                 return -EACCES;
1207         }
1208
1209         return 0;
1210 }
1211
1212 static
1213 __u32 gss_wrap_kerberos(struct gss_ctx *gctx,
1214                         rawobj_t *gsshdr,
1215                         rawobj_t *msg,
1216                         int msg_buflen,
1217                         rawobj_t *token)
1218 {
1219         struct krb5_ctx     *kctx = gctx->internal_ctx_id;
1220         struct krb5_enctype *ke = &enctypes[kctx->kc_enctype];
1221         struct krb5_header  *khdr;
1222         int                  blocksize;
1223         rawobj_t             cksum = RAWOBJ_EMPTY;
1224         rawobj_t             data_desc[3], cipher;
1225         __u8                 conf[GSS_MAX_CIPHER_BLOCK];
1226         int                  rc = 0;
1227
1228         LASSERT(ke);
1229         LASSERT(ke->ke_conf_size <= GSS_MAX_CIPHER_BLOCK);
1230         LASSERT(kctx->kc_keye.kb_tfm == NULL ||
1231                 ke->ke_conf_size >=
1232                 ll_crypto_blkcipher_blocksize(kctx->kc_keye.kb_tfm));
1233
1234         /*
1235          * final token format:
1236          * ---------------------------------------------------
1237          * | krb5 header | cipher text | checksum (16 bytes) |
1238          * ---------------------------------------------------
1239          */
1240
1241         /* fill krb5 header */
1242         LASSERT(token->len >= sizeof(*khdr));
1243         khdr = (struct krb5_header *) token->data;
1244         fill_krb5_header(kctx, khdr, 1);
1245
1246         /* generate confounder */
1247         cfs_get_random_bytes(conf, ke->ke_conf_size);
1248
1249         /* get encryption blocksize. note kc_keye might not associated with
1250          * a tfm, currently only for arcfour-hmac */
1251         if (kctx->kc_enctype == ENCTYPE_ARCFOUR_HMAC) {
1252                 LASSERT(kctx->kc_keye.kb_tfm == NULL);
1253                 blocksize = 1;
1254         } else {
1255                 LASSERT(kctx->kc_keye.kb_tfm);
1256                 blocksize = ll_crypto_blkcipher_blocksize(kctx->kc_keye.kb_tfm);
1257         }
1258         LASSERT(blocksize <= ke->ke_conf_size);
1259
1260         /* padding the message */
1261         if (add_padding(msg, msg_buflen, blocksize))
1262                 return GSS_S_FAILURE;
1263
1264         /*
1265          * clear text layout for checksum:
1266          * ------------------------------------------------------
1267          * | confounder | gss header | clear msgs | krb5 header |
1268          * ------------------------------------------------------
1269          */
1270         data_desc[0].data = conf;
1271         data_desc[0].len = ke->ke_conf_size;
1272         data_desc[1].data = gsshdr->data;
1273         data_desc[1].len = gsshdr->len;
1274         data_desc[2].data = msg->data;
1275         data_desc[2].len = msg->len;
1276
1277         /* compute checksum */
1278         if (krb5_make_checksum(kctx->kc_enctype, &kctx->kc_keyi,
1279                                khdr, 3, data_desc, 0, NULL, &cksum))
1280                 return GSS_S_FAILURE;
1281         LASSERT(cksum.len >= ke->ke_hash_size);
1282
1283         /*
1284          * clear text layout for encryption:
1285          * -----------------------------------------
1286          * | confounder | clear msgs | krb5 header |
1287          * -----------------------------------------
1288          */
1289         data_desc[0].data = conf;
1290         data_desc[0].len = ke->ke_conf_size;
1291         data_desc[1].data = msg->data;
1292         data_desc[1].len = msg->len;
1293         data_desc[2].data = (__u8 *) khdr;
1294         data_desc[2].len = sizeof(*khdr);
1295
1296         /* cipher text will be directly inplace */
1297         cipher.data = (__u8 *) (khdr + 1);
1298         cipher.len = token->len - sizeof(*khdr);
1299         LASSERT(cipher.len >= ke->ke_conf_size + msg->len + sizeof(*khdr));
1300
1301         if (kctx->kc_enctype == ENCTYPE_ARCFOUR_HMAC) {
1302                 rawobj_t                 arc4_keye;
1303                 struct ll_crypto_cipher *arc4_tfm;
1304
1305                 if (krb5_make_checksum(ENCTYPE_ARCFOUR_HMAC, &kctx->kc_keyi,
1306                                        NULL, 1, &cksum, 0, NULL, &arc4_keye)) {
1307                         CERROR("failed to obtain arc4 enc key\n");
1308                         GOTO(arc4_out, rc = -EACCES);
1309                 }
1310
1311                 arc4_tfm = ll_crypto_alloc_blkcipher("ecb(arc4)", 0, 0);
1312                 if (IS_ERR(arc4_tfm)) {
1313                         CERROR("failed to alloc tfm arc4 in ECB mode\n");
1314                         GOTO(arc4_out_key, rc = -EACCES);
1315                 }
1316
1317                 if (ll_crypto_blkcipher_setkey(arc4_tfm, arc4_keye.data,
1318                                                arc4_keye.len)) {
1319                         CERROR("failed to set arc4 key, len %d\n",
1320                                arc4_keye.len);
1321                         GOTO(arc4_out_tfm, rc = -EACCES);
1322                 }
1323
1324                 rc = krb5_encrypt_rawobjs(arc4_tfm, 1,
1325                                           3, data_desc, &cipher, 1);
1326 arc4_out_tfm:
1327                 ll_crypto_free_blkcipher(arc4_tfm);
1328 arc4_out_key:
1329                 rawobj_free(&arc4_keye);
1330 arc4_out:
1331                 do {} while(0); /* just to avoid compile warning */
1332         } else {
1333                 rc = krb5_encrypt_rawobjs(kctx->kc_keye.kb_tfm, 0,
1334                                           3, data_desc, &cipher, 1);
1335         }
1336
1337         if (rc != 0) {
1338                 rawobj_free(&cksum);
1339                 return GSS_S_FAILURE;
1340         }
1341
1342         /* fill in checksum */
1343         LASSERT(token->len >= sizeof(*khdr) + cipher.len + ke->ke_hash_size);
1344         memcpy((char *)(khdr + 1) + cipher.len,
1345                cksum.data + cksum.len - ke->ke_hash_size,
1346                ke->ke_hash_size);
1347         rawobj_free(&cksum);
1348
1349         /* final token length */
1350         token->len = sizeof(*khdr) + cipher.len + ke->ke_hash_size;
1351         return GSS_S_COMPLETE;
1352 }
1353
1354 static
1355 __u32 gss_prep_bulk_kerberos(struct gss_ctx *gctx,
1356                              struct ptlrpc_bulk_desc *desc)
1357 {
1358         struct krb5_ctx     *kctx = gctx->internal_ctx_id;
1359         int                  blocksize, i;
1360
1361         LASSERT(desc->bd_iov_count);
1362         LASSERT(desc->bd_enc_iov);
1363         LASSERT(kctx->kc_keye.kb_tfm);
1364
1365         blocksize = ll_crypto_blkcipher_blocksize(kctx->kc_keye.kb_tfm);
1366
1367         for (i = 0; i < desc->bd_iov_count; i++) {
1368                 LASSERT(desc->bd_enc_iov[i].kiov_page);
1369                 /*
1370                  * offset should always start at page boundary of either
1371                  * client or server side.
1372                  */
1373                 if (desc->bd_iov[i].kiov_offset & blocksize) {
1374                         CERROR("odd offset %d in page %d\n",
1375                                desc->bd_iov[i].kiov_offset, i);
1376                         return GSS_S_FAILURE;
1377                 }
1378
1379                 desc->bd_enc_iov[i].kiov_offset = desc->bd_iov[i].kiov_offset;
1380                 desc->bd_enc_iov[i].kiov_len = (desc->bd_iov[i].kiov_len +
1381                                                 blocksize - 1) & (~(blocksize - 1));
1382         }
1383
1384         return GSS_S_COMPLETE;
1385 }
1386
1387 static
1388 __u32 gss_wrap_bulk_kerberos(struct gss_ctx *gctx,
1389                              struct ptlrpc_bulk_desc *desc,
1390                              rawobj_t *token, int adj_nob)
1391 {
1392         struct krb5_ctx     *kctx = gctx->internal_ctx_id;
1393         struct krb5_enctype *ke = &enctypes[kctx->kc_enctype];
1394         struct krb5_header  *khdr;
1395         int                  blocksize;
1396         rawobj_t             cksum = RAWOBJ_EMPTY;
1397         rawobj_t             data_desc[1], cipher;
1398         __u8                 conf[GSS_MAX_CIPHER_BLOCK];
1399         int                  rc = 0;
1400
1401         LASSERT(ke);
1402         LASSERT(ke->ke_conf_size <= GSS_MAX_CIPHER_BLOCK);
1403
1404         /*
1405          * final token format:
1406          * --------------------------------------------------
1407          * | krb5 header | head/tail cipher text | checksum |
1408          * --------------------------------------------------
1409          */
1410
1411         /* fill krb5 header */
1412         LASSERT(token->len >= sizeof(*khdr));
1413         khdr = (struct krb5_header *) token->data;
1414         fill_krb5_header(kctx, khdr, 1);
1415
1416         /* generate confounder */
1417         cfs_get_random_bytes(conf, ke->ke_conf_size);
1418
1419         /* get encryption blocksize. note kc_keye might not associated with
1420          * a tfm, currently only for arcfour-hmac */
1421         if (kctx->kc_enctype == ENCTYPE_ARCFOUR_HMAC) {
1422                 LASSERT(kctx->kc_keye.kb_tfm == NULL);
1423                 blocksize = 1;
1424         } else {
1425                 LASSERT(kctx->kc_keye.kb_tfm);
1426                 blocksize = ll_crypto_blkcipher_blocksize(kctx->kc_keye.kb_tfm);
1427         }
1428
1429         /*
1430          * we assume the size of krb5_header (16 bytes) must be n * blocksize.
1431          * the bulk token size would be exactly (sizeof(krb5_header) +
1432          * blocksize + sizeof(krb5_header) + hashsize)
1433          */
1434         LASSERT(blocksize <= ke->ke_conf_size);
1435         LASSERT(sizeof(*khdr) >= blocksize && sizeof(*khdr) % blocksize == 0);
1436         LASSERT(token->len >= sizeof(*khdr) + blocksize + sizeof(*khdr) + 16);
1437
1438         /*
1439          * clear text layout for checksum:
1440          * ------------------------------------------
1441          * | confounder | clear pages | krb5 header |
1442          * ------------------------------------------
1443          */
1444         data_desc[0].data = conf;
1445         data_desc[0].len = ke->ke_conf_size;
1446
1447         /* compute checksum */
1448         if (krb5_make_checksum(kctx->kc_enctype, &kctx->kc_keyi,
1449                                khdr, 1, data_desc,
1450                                desc->bd_iov_count, desc->bd_iov,
1451                                &cksum))
1452                 return GSS_S_FAILURE;
1453         LASSERT(cksum.len >= ke->ke_hash_size);
1454
1455         /*
1456          * clear text layout for encryption:
1457          * ------------------------------------------
1458          * | confounder | clear pages | krb5 header |
1459          * ------------------------------------------
1460          *        |              |             |
1461          *        ----------  (cipher pages)   |
1462          * result token:   |                   |
1463          * -------------------------------------------
1464          * | krb5 header | cipher text | cipher text |
1465          * -------------------------------------------
1466          */
1467         data_desc[0].data = conf;
1468         data_desc[0].len = ke->ke_conf_size;
1469
1470         cipher.data = (__u8 *) (khdr + 1);
1471         cipher.len = blocksize + sizeof(*khdr);
1472
1473         if (kctx->kc_enctype == ENCTYPE_ARCFOUR_HMAC) {
1474                 LBUG();
1475                 rc = 0;
1476         } else {
1477                 rc = krb5_encrypt_bulk(kctx->kc_keye.kb_tfm, khdr,
1478                                        conf, desc, &cipher, adj_nob);
1479         }
1480
1481         if (rc != 0) {
1482                 rawobj_free(&cksum);
1483                 return GSS_S_FAILURE;
1484         }
1485
1486         /* fill in checksum */
1487         LASSERT(token->len >= sizeof(*khdr) + cipher.len + ke->ke_hash_size);
1488         memcpy((char *)(khdr + 1) + cipher.len,
1489                cksum.data + cksum.len - ke->ke_hash_size,
1490                ke->ke_hash_size);
1491         rawobj_free(&cksum);
1492
1493         /* final token length */
1494         token->len = sizeof(*khdr) + cipher.len + ke->ke_hash_size;
1495         return GSS_S_COMPLETE;
1496 }
1497
1498 static
1499 __u32 gss_unwrap_kerberos(struct gss_ctx  *gctx,
1500                           rawobj_t        *gsshdr,
1501                           rawobj_t        *token,
1502                           rawobj_t        *msg)
1503 {
1504         struct krb5_ctx     *kctx = gctx->internal_ctx_id;
1505         struct krb5_enctype *ke = &enctypes[kctx->kc_enctype];
1506         struct krb5_header  *khdr;
1507         unsigned char       *tmpbuf;
1508         int                  blocksize, bodysize;
1509         rawobj_t             cksum = RAWOBJ_EMPTY;
1510         rawobj_t             cipher_in, plain_out;
1511         rawobj_t             hash_objs[3];
1512         int                  rc = 0;
1513         __u32                major;
1514
1515         LASSERT(ke);
1516
1517         if (token->len < sizeof(*khdr)) {
1518                 CERROR("short signature: %u\n", token->len);
1519                 return GSS_S_DEFECTIVE_TOKEN;
1520         }
1521
1522         khdr = (struct krb5_header *) token->data;
1523
1524         major = verify_krb5_header(kctx, khdr, 1);
1525         if (major != GSS_S_COMPLETE) {
1526                 CERROR("bad krb5 header\n");
1527                 return major;
1528         }
1529
1530         /* block size */
1531         if (kctx->kc_enctype == ENCTYPE_ARCFOUR_HMAC) {
1532                 LASSERT(kctx->kc_keye.kb_tfm == NULL);
1533                 blocksize = 1;
1534         } else {
1535                 LASSERT(kctx->kc_keye.kb_tfm);
1536                 blocksize = ll_crypto_blkcipher_blocksize(kctx->kc_keye.kb_tfm);
1537         }
1538
1539         /* expected token layout:
1540          * ----------------------------------------
1541          * | krb5 header | cipher text | checksum |
1542          * ----------------------------------------
1543          */
1544         bodysize = token->len - sizeof(*khdr) - ke->ke_hash_size;
1545
1546         if (bodysize % blocksize) {
1547                 CERROR("odd bodysize %d\n", bodysize);
1548                 return GSS_S_DEFECTIVE_TOKEN;
1549         }
1550
1551         if (bodysize <= ke->ke_conf_size + sizeof(*khdr)) {
1552                 CERROR("incomplete token: bodysize %d\n", bodysize);
1553                 return GSS_S_DEFECTIVE_TOKEN;
1554         }
1555
1556         if (msg->len < bodysize - ke->ke_conf_size - sizeof(*khdr)) {
1557                 CERROR("buffer too small: %u, require %d\n",
1558                        msg->len, bodysize - ke->ke_conf_size);
1559                 return GSS_S_FAILURE;
1560         }
1561
1562         /* decrypting */
1563         OBD_ALLOC_LARGE(tmpbuf, bodysize);
1564         if (!tmpbuf)
1565                 return GSS_S_FAILURE;
1566
1567         major = GSS_S_FAILURE;
1568
1569         cipher_in.data = (__u8 *) (khdr + 1);
1570         cipher_in.len = bodysize;
1571         plain_out.data = tmpbuf;
1572         plain_out.len = bodysize;
1573
1574         if (kctx->kc_enctype == ENCTYPE_ARCFOUR_HMAC) {
1575                 rawobj_t                 arc4_keye;
1576                 struct ll_crypto_cipher *arc4_tfm;
1577
1578                 cksum.data = token->data + token->len - ke->ke_hash_size;
1579                 cksum.len = ke->ke_hash_size;
1580
1581                 if (krb5_make_checksum(ENCTYPE_ARCFOUR_HMAC, &kctx->kc_keyi,
1582                                        NULL, 1, &cksum, 0, NULL, &arc4_keye)) {
1583                         CERROR("failed to obtain arc4 enc key\n");
1584                         GOTO(arc4_out, rc = -EACCES);
1585                 }
1586
1587                 arc4_tfm = ll_crypto_alloc_blkcipher("ecb(arc4)", 0, 0);
1588                 if (IS_ERR(arc4_tfm)) {
1589                         CERROR("failed to alloc tfm arc4 in ECB mode\n");
1590                         GOTO(arc4_out_key, rc = -EACCES);
1591                 }
1592
1593                 if (ll_crypto_blkcipher_setkey(arc4_tfm,
1594                                          arc4_keye.data, arc4_keye.len)) {
1595                         CERROR("failed to set arc4 key, len %d\n",
1596                                arc4_keye.len);
1597                         GOTO(arc4_out_tfm, rc = -EACCES);
1598                 }
1599
1600                 rc = krb5_encrypt_rawobjs(arc4_tfm, 1,
1601                                           1, &cipher_in, &plain_out, 0);
1602 arc4_out_tfm:
1603                 ll_crypto_free_blkcipher(arc4_tfm);
1604 arc4_out_key:
1605                 rawobj_free(&arc4_keye);
1606 arc4_out:
1607                 cksum = RAWOBJ_EMPTY;
1608         } else {
1609                 rc = krb5_encrypt_rawobjs(kctx->kc_keye.kb_tfm, 0,
1610                                           1, &cipher_in, &plain_out, 0);
1611         }
1612
1613         if (rc != 0) {
1614                 CERROR("error decrypt\n");
1615                 goto out_free;
1616         }
1617         LASSERT(plain_out.len == bodysize);
1618
1619         /* expected clear text layout:
1620          * -----------------------------------------
1621          * | confounder | clear msgs | krb5 header |
1622          * -----------------------------------------
1623          */
1624
1625         /* verify krb5 header in token is not modified */
1626         if (memcmp(khdr, plain_out.data + plain_out.len - sizeof(*khdr),
1627                    sizeof(*khdr))) {
1628                 CERROR("decrypted krb5 header mismatch\n");
1629                 goto out_free;
1630         }
1631
1632         /* verify checksum, compose clear text as layout:
1633          * ------------------------------------------------------
1634          * | confounder | gss header | clear msgs | krb5 header |
1635          * ------------------------------------------------------
1636          */
1637         hash_objs[0].len = ke->ke_conf_size;
1638         hash_objs[0].data = plain_out.data;
1639         hash_objs[1].len = gsshdr->len;
1640         hash_objs[1].data = gsshdr->data;
1641         hash_objs[2].len = plain_out.len - ke->ke_conf_size - sizeof(*khdr);
1642         hash_objs[2].data = plain_out.data + ke->ke_conf_size;
1643         if (krb5_make_checksum(kctx->kc_enctype, &kctx->kc_keyi,
1644                                khdr, 3, hash_objs, 0, NULL, &cksum))
1645                 goto out_free;
1646
1647         LASSERT(cksum.len >= ke->ke_hash_size);
1648         if (memcmp((char *)(khdr + 1) + bodysize,
1649                    cksum.data + cksum.len - ke->ke_hash_size,
1650                    ke->ke_hash_size)) {
1651                 CERROR("checksum mismatch\n");
1652                 goto out_free;
1653         }
1654
1655         msg->len =  bodysize - ke->ke_conf_size - sizeof(*khdr);
1656         memcpy(msg->data, tmpbuf + ke->ke_conf_size, msg->len);
1657
1658         major = GSS_S_COMPLETE;
1659 out_free:
1660         OBD_FREE_LARGE(tmpbuf, bodysize);
1661         rawobj_free(&cksum);
1662         return major;
1663 }
1664
1665 static
1666 __u32 gss_unwrap_bulk_kerberos(struct gss_ctx *gctx,
1667                                struct ptlrpc_bulk_desc *desc,
1668                                rawobj_t *token, int adj_nob)
1669 {
1670         struct krb5_ctx     *kctx = gctx->internal_ctx_id;
1671         struct krb5_enctype *ke = &enctypes[kctx->kc_enctype];
1672         struct krb5_header  *khdr;
1673         int                  blocksize;
1674         rawobj_t             cksum = RAWOBJ_EMPTY;
1675         rawobj_t             cipher, plain;
1676         rawobj_t             data_desc[1];
1677         int                  rc;
1678         __u32                major;
1679
1680         LASSERT(ke);
1681
1682         if (token->len < sizeof(*khdr)) {
1683                 CERROR("short signature: %u\n", token->len);
1684                 return GSS_S_DEFECTIVE_TOKEN;
1685         }
1686
1687         khdr = (struct krb5_header *) token->data;
1688
1689         major = verify_krb5_header(kctx, khdr, 1);
1690         if (major != GSS_S_COMPLETE) {
1691                 CERROR("bad krb5 header\n");
1692                 return major;
1693         }
1694
1695         /* block size */
1696         if (kctx->kc_enctype == ENCTYPE_ARCFOUR_HMAC) {
1697                 LASSERT(kctx->kc_keye.kb_tfm == NULL);
1698                 blocksize = 1;
1699                 LBUG();
1700         } else {
1701                 LASSERT(kctx->kc_keye.kb_tfm);
1702                 blocksize = ll_crypto_blkcipher_blocksize(kctx->kc_keye.kb_tfm);
1703         }
1704         LASSERT(sizeof(*khdr) >= blocksize && sizeof(*khdr) % blocksize == 0);
1705
1706         /*
1707          * token format is expected as:
1708          * -----------------------------------------------
1709          * | krb5 header | head/tail cipher text | cksum |
1710          * -----------------------------------------------
1711          */
1712         if (token->len < sizeof(*khdr) + blocksize + sizeof(*khdr) +
1713                          ke->ke_hash_size) {
1714                 CERROR("short token size: %u\n", token->len);
1715                 return GSS_S_DEFECTIVE_TOKEN;
1716         }
1717
1718         cipher.data = (__u8 *) (khdr + 1);
1719         cipher.len = blocksize + sizeof(*khdr);
1720         plain.data = cipher.data;
1721         plain.len = cipher.len;
1722
1723         rc = krb5_decrypt_bulk(kctx->kc_keye.kb_tfm, khdr,
1724                                desc, &cipher, &plain, adj_nob);
1725         if (rc)
1726                 return GSS_S_DEFECTIVE_TOKEN;
1727
1728         /*
1729          * verify checksum, compose clear text as layout:
1730          * ------------------------------------------
1731          * | confounder | clear pages | krb5 header |
1732          * ------------------------------------------
1733          */
1734         data_desc[0].data = plain.data;
1735         data_desc[0].len = blocksize;
1736
1737         if (krb5_make_checksum(kctx->kc_enctype, &kctx->kc_keyi,
1738                                khdr, 1, data_desc,
1739                                desc->bd_iov_count, desc->bd_iov,
1740                                &cksum))
1741                 return GSS_S_FAILURE;
1742         LASSERT(cksum.len >= ke->ke_hash_size);
1743
1744         if (memcmp(plain.data + blocksize + sizeof(*khdr),
1745                    cksum.data + cksum.len - ke->ke_hash_size,
1746                    ke->ke_hash_size)) {
1747                 CERROR("checksum mismatch\n");
1748                 rawobj_free(&cksum);
1749                 return GSS_S_BAD_SIG;
1750         }
1751
1752         rawobj_free(&cksum);
1753         return GSS_S_COMPLETE;
1754 }
1755
1756 int gss_display_kerberos(struct gss_ctx        *ctx,
1757                          char                  *buf,
1758                          int                    bufsize)
1759 {
1760         struct krb5_ctx    *kctx = ctx->internal_ctx_id;
1761         int                 written;
1762
1763         written = snprintf(buf, bufsize, "krb5 (%s)",
1764                            enctype2str(kctx->kc_enctype));
1765         return written;
1766 }
1767
1768 static struct gss_api_ops gss_kerberos_ops = {
1769         .gss_import_sec_context     = gss_import_sec_context_kerberos,
1770         .gss_copy_reverse_context   = gss_copy_reverse_context_kerberos,
1771         .gss_inquire_context        = gss_inquire_context_kerberos,
1772         .gss_get_mic                = gss_get_mic_kerberos,
1773         .gss_verify_mic             = gss_verify_mic_kerberos,
1774         .gss_wrap                   = gss_wrap_kerberos,
1775         .gss_unwrap                 = gss_unwrap_kerberos,
1776         .gss_prep_bulk              = gss_prep_bulk_kerberos,
1777         .gss_wrap_bulk              = gss_wrap_bulk_kerberos,
1778         .gss_unwrap_bulk            = gss_unwrap_bulk_kerberos,
1779         .gss_delete_sec_context     = gss_delete_sec_context_kerberos,
1780         .gss_display                = gss_display_kerberos,
1781 };
1782
1783 static struct subflavor_desc gss_kerberos_sfs[] = {
1784         {
1785                 .sf_subflavor   = SPTLRPC_SUBFLVR_KRB5N,
1786                 .sf_qop         = 0,
1787                 .sf_service     = SPTLRPC_SVC_NULL,
1788                 .sf_name        = "krb5n"
1789         },
1790         {
1791                 .sf_subflavor   = SPTLRPC_SUBFLVR_KRB5A,
1792                 .sf_qop         = 0,
1793                 .sf_service     = SPTLRPC_SVC_AUTH,
1794                 .sf_name        = "krb5a"
1795         },
1796         {
1797                 .sf_subflavor   = SPTLRPC_SUBFLVR_KRB5I,
1798                 .sf_qop         = 0,
1799                 .sf_service     = SPTLRPC_SVC_INTG,
1800                 .sf_name        = "krb5i"
1801         },
1802         {
1803                 .sf_subflavor   = SPTLRPC_SUBFLVR_KRB5P,
1804                 .sf_qop         = 0,
1805                 .sf_service     = SPTLRPC_SVC_PRIV,
1806                 .sf_name        = "krb5p"
1807         },
1808 };
1809
1810 /*
1811  * currently we leave module owner NULL
1812  */
1813 static struct gss_api_mech gss_kerberos_mech = {
1814         .gm_owner       = NULL, /*THIS_MODULE, */
1815         .gm_name        = "krb5",
1816         .gm_oid         = (rawobj_t)
1817                                 {9, "\052\206\110\206\367\022\001\002\002"},
1818         .gm_ops         = &gss_kerberos_ops,
1819         .gm_sf_num      = 4,
1820         .gm_sfs         = gss_kerberos_sfs,
1821 };
1822
1823 int __init init_kerberos_module(void)
1824 {
1825         int status;
1826
1827         spin_lock_init(&krb5_seq_lock);
1828
1829         status = lgss_mech_register(&gss_kerberos_mech);
1830         if (status)
1831                 CERROR("Failed to register kerberos gss mechanism!\n");
1832         return status;
1833 }
1834
1835 void __exit cleanup_kerberos_module(void)
1836 {
1837         lgss_mech_unregister(&gss_kerberos_mech);
1838 }