lustre/sec/gss/svcsec_gss.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Modifications for Lustre
   5  * Copyright 2004, Cluster File Systems, Inc.
   6  * All rights reserved
   7  * Author: Eric Mei <ericm@clusterfs.com>
   8  */
   9
  10 /*
  11  * Neil Brown <neilb@cse.unsw.edu.au>
  12  * J. Bruce Fields <bfields@umich.edu>
  13  * Andy Adamson <andros@umich.edu>
  14  * Dug Song <dugsong@monkey.org>
  15  *
  16  * RPCSEC_GSS server authentication.
  17  * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078
  18  * (gssapi)
  19  *
  20  * The RPCSEC_GSS involves three stages:
  21  *  1/ context creation
  22  *  2/ data exchange
  23  *  3/ context destruction
  24  *
  25  * Context creation is handled largely by upcalls to user-space.
  26  *  In particular, GSS_Accept_sec_context is handled by an upcall
  27  * Data exchange is handled entirely within the kernel
  28  *  In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel.
  29  * Context destruction is handled in-kernel
  30  *  GSS_Delete_sec_context is in-kernel
  31  *
  32  * Context creation is initiated by a RPCSEC_GSS_INIT request arriving.
  33  * The context handle and gss_token are used as a key into the rpcsec_init cache.
  34  * The content of this cache includes some of the outputs of GSS_Accept_sec_context,
  35  * being major_status, minor_status, context_handle, reply_token.
  36  * These are sent back to the client.
  37  * Sequence window management is handled by the kernel.  The window size if currently
  38  * a compile time constant.
  39  *
  40  * When user-space is happy that a context is established, it places an entry
  41  * in the rpcsec_context cache. The key for this cache is the context_handle.
  42  * The content includes:
  43  *   uid/gidlist - for determining access rights
  44  *   mechanism type
  45  *   mechanism specific information, such as a key
  46  *
  47  */
  48
  49 #define DEBUG_SUBSYSTEM S_SEC
  50 #ifdef __KERNEL__
  51 #include <linux/types.h>
  52 #include <linux/init.h>
  53 #include <linux/module.h>
  54 #include <linux/slab.h>
  55 #include <linux/hash.h>
  56 #else
  57 #include <liblustre.h>
  58 #endif
  59
  60 #include <linux/sunrpc/cache.h>
  61
  62 #include <libcfs/kp30.h>
  63 #include <linux/obd.h>
  64 #include <linux/obd_class.h>
  65 #include <linux/obd_support.h>
  66 #include <linux/lustre_idl.h>
  67 #include <linux/lustre_net.h>
  68 #include <linux/lustre_import.h>
  69 #include <linux/lustre_sec.h>
  70
  71 #include "gss_err.h"
  72 #include "gss_internal.h"
  73 #include "gss_api.h"
  74
  75 static inline unsigned long hash_mem(char *buf, int length, int bits)
  76 {
  77         unsigned long hash = 0;
  78         unsigned long l = 0;
  79         int len = 0;
  80         unsigned char c;
  81         do {
  82                 if (len == length) {
  83                         c = (char)len; len = -1;
  84                 } else
  85                         c = *buf++;
  86                 l = (l << 8) | c;
  87                 len++;
  88                 if ((len & (BITS_PER_LONG/8-1))==0)
  89                         hash = hash_long(hash^l, BITS_PER_LONG);
  90         } while (len);
  91         return hash >> (BITS_PER_LONG - bits);
  92 }
  93
  94 /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
  95  * into replies.
  96  *
  97  * Key is context handle (\x if empty) and gss_token.
  98  * Content is major_status minor_status (integers) context_handle, reply_token.
  99  *
 100  */
 101
 102 #define RSI_HASHBITS    6
 103 #define RSI_HASHMAX     (1<<RSI_HASHBITS)
 104 #define RSI_HASHMASK    (RSI_HASHMAX-1)
 105
 106 struct rsi {
 107         struct cache_head       h;
 108         __u32                   naltype;
 109         __u32                   netid;
 110         __u64                   nid;
 111         rawobj_t                in_handle, in_token;
 112         rawobj_t                out_handle, out_token;
 113         int                     major_status, minor_status;
 114 };
 115
 116 static struct cache_head *rsi_table[RSI_HASHMAX];
 117 static struct cache_detail rsi_cache;
 118
 119 static void rsi_free(struct rsi *rsii)
 120 {
 121         rawobj_free(&rsii->in_handle);
 122         rawobj_free(&rsii->in_token);
 123         rawobj_free(&rsii->out_handle);
 124         rawobj_free(&rsii->out_token);
 125 }
 126
 127 static void rsi_put(struct cache_head *item, struct cache_detail *cd)
 128 {
 129         struct rsi *rsii = container_of(item, struct rsi, h);
 130         if (cache_put(item, cd)) {
 131                 rsi_free(rsii);
 132                 OBD_FREE(rsii, sizeof(*rsii));
 133         }
 134 }
 135
 136 static inline int rsi_hash(struct rsi *item)
 137 {
 138         return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
 139               ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
 140 }
 141
 142 static inline int rsi_match(struct rsi *item, struct rsi *tmp)
 143 {
 144         return (rawobj_equal(&item->in_handle, &tmp->in_handle) &&
 145                 rawobj_equal(&item->in_token, &tmp->in_token));
 146 }
 147
 148 static void rsi_request(struct cache_detail *cd,
 149                         struct cache_head *h,
 150                         char **bpp, int *blen)
 151 {
 152         struct rsi *rsii = container_of(h, struct rsi, h);
 153
 154         qword_addhex(bpp, blen, (char *) &rsii->naltype, sizeof(rsii->naltype));
 155         qword_addhex(bpp, blen, (char *) &rsii->netid, sizeof(rsii->netid));
 156         qword_addhex(bpp, blen, (char *) &rsii->nid, sizeof(rsii->nid));
 157         qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
 158         qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
 159         (*bpp)[-1] = '\n';
 160 }
 161
 162 static int
 163 gssd_reply(struct rsi *item)
 164 {
 165         struct rsi *tmp;
 166         struct cache_head **hp, **head;
 167         ENTRY;
 168
 169         head = &rsi_cache.hash_table[rsi_hash(item)];
 170         write_lock(&rsi_cache.hash_lock);
 171         for (hp = head; *hp != NULL; hp = &tmp->h.next) {
 172                 tmp = container_of(*hp, struct rsi, h);
 173                 if (rsi_match(tmp, item)) {
 174                         cache_get(&tmp->h);
 175                         clear_bit(CACHE_HASHED, &tmp->h.flags);
 176                         *hp = tmp->h.next;
 177                         tmp->h.next = NULL;
 178                         rsi_cache.entries--;
 179                         if (test_bit(CACHE_VALID, &tmp->h.flags)) {
 180                                 write_unlock(&rsi_cache.hash_lock);
 181                                 rsi_put(&tmp->h, &rsi_cache);
 182                                 RETURN(-EINVAL);
 183                         }
 184                         set_bit(CACHE_HASHED, &item->h.flags);
 185                         item->h.next = *hp;
 186                         *hp = &item->h;
 187                         rsi_cache.entries++;
 188                         set_bit(CACHE_VALID, &item->h.flags);
 189                         item->h.last_refresh = get_seconds();
 190                         write_unlock(&rsi_cache.hash_lock);
 191                         cache_fresh(&rsi_cache, &tmp->h, 0);
 192                         rsi_put(&tmp->h, &rsi_cache);
 193                         RETURN(0);
 194                 }
 195         }
 196         write_unlock(&rsi_cache.hash_lock);
 197         RETURN(-EINVAL);
 198 }
 199
 200 /* XXX
 201  * here we just wait here for its completion or timedout. it's a
 202  * hacking but works, and we'll comeup with real fix if we decided
 203  * to still stick with NFS4 cache code
 204  */
 205 static struct rsi *
 206 gssd_upcall(struct rsi *item, struct cache_req *chandle)
 207 {
 208         struct rsi *tmp;
 209         struct cache_head **hp, **head;
 210         unsigned long starttime;
 211         ENTRY;
 212
 213         head = &rsi_cache.hash_table[rsi_hash(item)];
 214         read_lock(&rsi_cache.hash_lock);
 215         for (hp = head; *hp != NULL; hp = &tmp->h.next) {
 216                 tmp = container_of(*hp, struct rsi, h);
 217                 if (rsi_match(tmp, item)) {
 218                         LBUG();
 219                         if (!test_bit(CACHE_VALID, &tmp->h.flags)) {
 220                                 CERROR("found rsi without VALID\n");
 221                                 read_unlock(&rsi_cache.hash_lock);
 222                                 return NULL;
 223                         }
 224                         *hp = tmp->h.next;
 225                         tmp->h.next = NULL;
 226                         rsi_cache.entries--;
 227                         cache_get(&tmp->h);
 228                         read_unlock(&rsi_cache.hash_lock);
 229                         return tmp;
 230                 }
 231         }
 232         // cache_get(&item->h);
 233         set_bit(CACHE_HASHED, &item->h.flags);
 234         item->h.next = *head;
 235         *head = &item->h;
 236         rsi_cache.entries++;
 237         read_unlock(&rsi_cache.hash_lock);
 238         cache_get(&item->h);
 239
 240         cache_check(&rsi_cache, &item->h, chandle);
 241         starttime = get_seconds();
 242         do {
 243                 yield();
 244                 read_lock(&rsi_cache.hash_lock);
 245                 for (hp = head; *hp != NULL; hp = &tmp->h.next) {
 246                         tmp = container_of(*hp, struct rsi, h);
 247                         if (tmp == item)
 248                                 continue;
 249                         if (rsi_match(tmp, item)) {
 250                                 if (!test_bit(CACHE_VALID, &tmp->h.flags)) {
 251                                         read_unlock(&rsi_cache.hash_lock);
 252                                         return NULL;
 253                                 }
 254                                 cache_get(&tmp->h);
 255                                 clear_bit(CACHE_HASHED, &tmp->h.flags);
 256                                 *hp = tmp->h.next;
 257                                 tmp->h.next = NULL;
 258                                 rsi_cache.entries--;
 259                                 read_unlock(&rsi_cache.hash_lock);
 260                                 return tmp;
 261                         }
 262                 }
 263                 read_unlock(&rsi_cache.hash_lock);
 264         } while ((get_seconds() - starttime) <= 5);
 265         CERROR("5s timeout while waiting cache refill\n");
 266         return NULL;
 267 }
 268
 269 static int rsi_parse(struct cache_detail *cd,
 270                      char *mesg, int mlen)
 271 {
 272         /* context token expiry major minor context token */
 273         char *buf = mesg;
 274         char *ep;
 275         int len;
 276         struct rsi *rsii;
 277         time_t expiry;
 278         int status = -EINVAL;
 279         ENTRY;
 280
 281         OBD_ALLOC(rsii, sizeof(*rsii));
 282         if (!rsii) {
 283                 CERROR("failed to alloc rsii\n");
 284                 RETURN(-ENOMEM);
 285         }
 286         cache_init(&rsii->h);
 287
 288         /* handle */
 289         len = qword_get(&mesg, buf, mlen);
 290         if (len < 0)
 291                 goto out;
 292         status = -ENOMEM;
 293         if (rawobj_alloc(&rsii->in_handle, buf, len))
 294                 goto out;
 295
 296         /* token */
 297         len = qword_get(&mesg, buf, mlen);
 298         status = -EINVAL;
 299         if (len < 0)
 300                 goto out;;
 301         status = -ENOMEM;
 302         if (rawobj_alloc(&rsii->in_token, buf, len))
 303                 goto out;
 304
 305         /* expiry */
 306         expiry = get_expiry(&mesg);
 307         status = -EINVAL;
 308         if (expiry == 0)
 309                 goto out;
 310
 311         /* major/minor */
 312         len = qword_get(&mesg, buf, mlen);
 313         if (len < 0)
 314                 goto out;
 315         if (len == 0) {
 316                 goto out;
 317         } else {
 318                 rsii->major_status = simple_strtoul(buf, &ep, 10);
 319                 if (*ep)
 320                         goto out;
 321                 len = qword_get(&mesg, buf, mlen);
 322                 if (len <= 0)
 323                         goto out;
 324                 rsii->minor_status = simple_strtoul(buf, &ep, 10);
 325                 if (*ep)
 326                         goto out;
 327
 328                 /* out_handle */
 329                 len = qword_get(&mesg, buf, mlen);
 330                 if (len < 0)
 331                         goto out;
 332                 status = -ENOMEM;
 333                 if (rawobj_alloc(&rsii->out_handle, buf, len))
 334                         goto out;
 335
 336                 /* out_token */
 337                 len = qword_get(&mesg, buf, mlen);
 338                 status = -EINVAL;
 339                 if (len < 0)
 340                         goto out;
 341                 status = -ENOMEM;
 342                 if (rawobj_alloc(&rsii->out_token, buf, len))
 343                         goto out;
 344         }
 345         rsii->h.expiry_time = expiry;
 346         status = gssd_reply(rsii);
 347 out:
 348         if (rsii)
 349                 rsi_put(&rsii->h, &rsi_cache);
 350         RETURN(status);
 351 }
 352
 353 static struct cache_detail rsi_cache = {
 354         .hash_size      = RSI_HASHMAX,
 355         .hash_table     = rsi_table,
 356         .name           = "auth.ptlrpcs.init",
 357         .cache_put      = rsi_put,
 358         .cache_request  = rsi_request,
 359         .cache_parse    = rsi_parse,
 360 };
 361
 362 /*
 363  * The rpcsec_context cache is used to store a context that is
 364  * used in data exchange.
 365  * The key is a context handle. The content is:
 366  *  uid, gidlist, mechanism, service-set, mech-specific-data
 367  */
 368
 369 #define RSC_HASHBITS    10
 370 #define RSC_HASHMAX     (1<<RSC_HASHBITS)
 371 #define RSC_HASHMASK    (RSC_HASHMAX-1)
 372
 373 #define GSS_SEQ_WIN     512
 374
 375 struct gss_svc_seq_data {
 376         /* highest seq number seen so far: */
 377         __u32                   sd_max;
 378         /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
 379          * sd_win is nonzero iff sequence number i has been seen already: */
 380         unsigned long           sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
 381         spinlock_t              sd_lock;
 382 };
 383
 384 struct rsc {
 385         struct cache_head       h;
 386         rawobj_t                handle;
 387         __u32                   remote_realm;
 388         struct vfs_cred         cred;
 389         uid_t                   mapped_uid;
 390         struct gss_svc_seq_data seqdata;
 391         struct gss_ctx         *mechctx;
 392 };
 393
 394 static struct cache_head *rsc_table[RSC_HASHMAX];
 395 static struct cache_detail rsc_cache;
 396
 397 static void rsc_free(struct rsc *rsci)
 398 {
 399         rawobj_free(&rsci->handle);
 400         if (rsci->mechctx)
 401                 kgss_delete_sec_context(&rsci->mechctx);
 402 #if 0
 403         if (rsci->cred.vc_ginfo)
 404                 put_group_info(rsci->cred.vc_ginfo);
 405 #endif
 406 }
 407
 408 static void rsc_put(struct cache_head *item, struct cache_detail *cd)
 409 {
 410         struct rsc *rsci = container_of(item, struct rsc, h);
 411
 412         if (cache_put(item, cd)) {
 413                 rsc_free(rsci);
 414                 OBD_FREE(rsci, sizeof(*rsci));
 415         }
 416 }
 417
 418 static inline int
 419 rsc_hash(struct rsc *rsci)
 420 {
 421         return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
 422 }
 423
 424 static inline int
 425 rsc_match(struct rsc *new, struct rsc *tmp)
 426 {
 427         return rawobj_equal(&new->handle, &tmp->handle);
 428 }
 429
 430 static struct rsc *rsc_lookup(struct rsc *item, int set)
 431 {
 432         struct rsc *tmp = NULL;
 433         struct cache_head **hp, **head;
 434         head = &rsc_cache.hash_table[rsc_hash(item)];
 435         ENTRY;
 436
 437         if (set)
 438                 write_lock(&rsc_cache.hash_lock);
 439         else
 440                 read_lock(&rsc_cache.hash_lock);
 441         for (hp = head; *hp != NULL; hp = &tmp->h.next) {
 442                 tmp = container_of(*hp, struct rsc, h);
 443                 if (!rsc_match(tmp, item))
 444                         continue;
 445                 cache_get(&tmp->h);
 446                 if (!set) {
 447                         goto out_noset;
 448                 }
 449                 *hp = tmp->h.next;
 450                 tmp->h.next = NULL;
 451                 clear_bit(CACHE_HASHED, &tmp->h.flags);
 452                 rsc_put(&tmp->h, &rsc_cache);
 453                 goto out_set;
 454         }
 455         /* Didn't find anything */
 456         if (!set)
 457                 goto out_noset;
 458         rsc_cache.entries++;
 459 out_set:
 460         set_bit(CACHE_HASHED, &item->h.flags);
 461         item->h.next = *head;
 462         *head = &item->h;
 463         write_unlock(&rsc_cache.hash_lock);
 464         cache_fresh(&rsc_cache, &item->h, item->h.expiry_time);
 465         cache_get(&item->h);
 466         RETURN(item);
 467 out_noset:
 468         read_unlock(&rsc_cache.hash_lock);
 469         RETURN(tmp);
 470 }
 471
 472 static int rsc_parse(struct cache_detail *cd,
 473                      char *mesg, int mlen)
 474 {
 475         /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
 476         char *buf = mesg;
 477         int len, rv;
 478         struct rsc *rsci, *res = NULL;
 479         time_t expiry;
 480         int status = -EINVAL;
 481
 482         OBD_ALLOC(rsci, sizeof(*rsci));
 483         if (!rsci) {
 484                 CERROR("fail to alloc rsci\n");
 485                 return -ENOMEM;
 486         }
 487         cache_init(&rsci->h);
 488
 489         /* context handle */
 490         len = qword_get(&mesg, buf, mlen);
 491         if (len < 0) goto out;
 492         status = -ENOMEM;
 493         if (rawobj_alloc(&rsci->handle, buf, len))
 494                 goto out;
 495
 496         /* expiry */
 497         expiry = get_expiry(&mesg);
 498         status = -EINVAL;
 499         if (expiry == 0)
 500                 goto out;
 501
 502         /* remote flag */
 503         rv = get_int(&mesg, &rsci->remote_realm);
 504         if (rv) {
 505                 CERROR("fail to get remote flag\n");
 506                 goto out;
 507         }
 508
 509         /* mapped uid */
 510         rv = get_int(&mesg, &rsci->mapped_uid);
 511         if (rv) {
 512                 CERROR("fail to get mapped uid\n");
 513                 goto out;
 514         }
 515
 516         /* uid, or NEGATIVE */
 517         rv = get_int(&mesg, &rsci->cred.vc_uid);
 518         if (rv == -EINVAL)
 519                 goto out;
 520         if (rv == -ENOENT) {
 521                 CERROR("NOENT? set rsc entry negative\n");
 522                 set_bit(CACHE_NEGATIVE, &rsci->h.flags);
 523         } else {
 524                 struct gss_api_mech *gm;
 525                 rawobj_t tmp_buf;
 526                 __u64 ctx_expiry;
 527
 528                 /* gid */
 529                 if (get_int(&mesg, &rsci->cred.vc_gid))
 530                         goto out;
 531
 532                 /* mech name */
 533                 len = qword_get(&mesg, buf, mlen);
 534                 if (len < 0)
 535                         goto out;
 536                 gm = kgss_name_to_mech(buf);
 537                 status = -EOPNOTSUPP;
 538                 if (!gm)
 539                         goto out;
 540
 541                 status = -EINVAL;
 542                 /* mech-specific data: */
 543                 len = qword_get(&mesg, buf, mlen);
 544                 if (len < 0) {
 545                         kgss_mech_put(gm);
 546                         goto out;
 547                 }
 548                 tmp_buf.len = len;
 549                 tmp_buf.data = buf;
 550                 if (kgss_import_sec_context(&tmp_buf, gm, &rsci->mechctx)) {
 551                         kgss_mech_put(gm);
 552                         goto out;
 553                 }
 554
 555                 /* currently the expiry time passed down from user-space
 556                  * is invalid, here we retrive it from mech.
 557                  */
 558                 if (kgss_inquire_context(rsci->mechctx, &ctx_expiry)) {
 559                         CERROR("unable to get expire time, drop it\n");
 560                         set_bit(CACHE_NEGATIVE, &rsci->h.flags);
 561                         kgss_mech_put(gm);
 562                         goto out;
 563                 }
 564                 expiry = (time_t) ctx_expiry;
 565
 566                 kgss_mech_put(gm);
 567         }
 568         rsci->h.expiry_time = expiry;
 569         spin_lock_init(&rsci->seqdata.sd_lock);
 570         res = rsc_lookup(rsci, 1);
 571         rsc_put(&res->h, &rsc_cache);
 572         status = 0;
 573 out:
 574         if (rsci)
 575                 rsc_put(&rsci->h, &rsc_cache);
 576         return status;
 577 }
 578
 579 /*
 580  * flush all entries with @uid. @uid == -1 will match all.
 581  * we only know the uid, maybe netid/nid in the future, in all cases
 582  * we must search the whole cache
 583  */
 584 static void rsc_flush(uid_t uid)
 585 {
 586         struct cache_head **ch;
 587         struct rsc *rscp;
 588         int n;
 589         ENTRY;
 590
 591         write_lock(&rsc_cache.hash_lock);
 592         for (n = 0; n < RSC_HASHMAX; n++) {
 593                 for (ch = &rsc_cache.hash_table[n]; *ch;) {
 594                         rscp = container_of(*ch, struct rsc, h);
 595                         if (uid == -1 || rscp->cred.vc_uid == uid) {
 596                                 /* it seems simply set NEGATIVE doesn't work */
 597                                 *ch = (*ch)->next;
 598                                 rscp->h.next = NULL;
 599                                 cache_get(&rscp->h);
 600                                 set_bit(CACHE_NEGATIVE, &rscp->h.flags);
 601                                 clear_bit(CACHE_HASHED, &rscp->h.flags);
 602                                 CWARN("flush rsc %p for uid %u\n",
 603                                        rscp, rscp->cred.vc_uid);
 604                                 rsc_put(&rscp->h, &rsc_cache);
 605                                 rsc_cache.entries--;
 606                                 continue;
 607                         }
 608                         ch = &((*ch)->next);
 609                 }
 610         }
 611         write_unlock(&rsc_cache.hash_lock);
 612         EXIT;
 613 }
 614
 615 static struct cache_detail rsc_cache = {
 616         .hash_size      = RSC_HASHMAX,
 617         .hash_table     = rsc_table,
 618         .name           = "auth.ptlrpcs.context",
 619         .cache_put      = rsc_put,
 620         .cache_parse    = rsc_parse,
 621 };
 622
 623 static struct rsc *
 624 gss_svc_searchbyctx(rawobj_t *handle)
 625 {
 626         struct rsc rsci;
 627         struct rsc *found;
 628
 629         rsci.handle = *handle;
 630         found = rsc_lookup(&rsci, 0);
 631         if (!found)
 632                 return NULL;
 633
 634         if (cache_check(&rsc_cache, &found->h, NULL))
 635                 return NULL;
 636
 637         return found;
 638 }
 639
 640 struct gss_svc_data {
 641         /* decoded gss client cred: */
 642         struct rpc_gss_wire_cred        clcred;
 643         /* internal used status */
 644         unsigned int                    is_init:1,
 645                                         is_init_continue:1,
 646                                         is_err_notify:1,
 647                                         is_fini:1;
 648         int                             reserve_len;
 649 };
 650
 651 /* FIXME
 652  * again hacking: only try to give the svcgssd a chance to handle
 653  * upcalls.
 654  */
 655 struct cache_deferred_req* my_defer(struct cache_req *req)
 656 {
 657         yield();
 658         return NULL;
 659 }
 660 static struct cache_req my_chandle = {my_defer};
 661
 662 /* Implements sequence number algorithm as specified in RFC 2203. */
 663 static int
 664 gss_check_seq_num(struct gss_svc_seq_data *sd, __u32 seq_num)
 665 {
 666         int rc = 0;
 667
 668         spin_lock(&sd->sd_lock);
 669         if (seq_num > sd->sd_max) {
 670                 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
 671                         memset(sd->sd_win, 0, sizeof(sd->sd_win));
 672                         sd->sd_max = seq_num;
 673                 } else {
 674                         while(sd->sd_max < seq_num) {
 675                                 sd->sd_max++;
 676                                 __clear_bit(sd->sd_max % GSS_SEQ_WIN,
 677                                             sd->sd_win);
 678                         }
 679                 }
 680                 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
 681                 goto exit;
 682         } else if (seq_num + GSS_SEQ_WIN <= sd->sd_max) {
 683                 CERROR("seq %u too low: max %u, win %d\n",
 684                         seq_num, sd->sd_max, GSS_SEQ_WIN);
 685                 rc = 1;
 686                 goto exit;
 687         }
 688
 689         if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) {
 690                 CERROR("seq %u is replay: max %u, win %d\n",
 691                         seq_num, sd->sd_max, GSS_SEQ_WIN);
 692                 rc = 1;
 693         }
 694 exit:
 695         spin_unlock(&sd->sd_lock);
 696         return rc;
 697 }
 698
 699 static int
 700 gss_svc_verify_request(struct ptlrpc_request *req,
 701                        struct rsc *rsci,
 702                        struct rpc_gss_wire_cred *gc,
 703                        __u32 *vp, __u32 vlen)
 704 {
 705         struct ptlrpcs_wire_hdr *sec_hdr;
 706         struct gss_ctx *ctx = rsci->mechctx;
 707         __u32 maj_stat;
 708         rawobj_t msg;
 709         rawobj_t mic;
 710         ENTRY;
 711
 712         sec_hdr = (struct ptlrpcs_wire_hdr *) req->rq_reqbuf;
 713
 714         req->rq_reqmsg = (struct lustre_msg *) (req->rq_reqbuf + sizeof(*sec_hdr));
 715         req->rq_reqlen = sec_hdr->msg_len;
 716
 717         msg.len = sec_hdr->msg_len;
 718         msg.data = (__u8 *)req->rq_reqmsg;
 719
 720         mic.len = le32_to_cpu(*vp++);
 721         mic.data = (char *) vp;
 722         vlen -= 4;
 723
 724         if (mic.len > vlen) {
 725                 CERROR("checksum len %d, while buffer len %d\n",
 726                         mic.len, vlen);
 727                 RETURN(GSS_S_CALL_BAD_STRUCTURE);
 728         }
 729
 730         if (mic.len > 256) {
 731                 CERROR("invalid mic len %d\n", mic.len);
 732                 RETURN(GSS_S_CALL_BAD_STRUCTURE);
 733         }
 734
 735         maj_stat = kgss_verify_mic(ctx, &msg, &mic, NULL);
 736         if (maj_stat != GSS_S_COMPLETE) {
 737                 CERROR("MIC verification error: major %x\n", maj_stat);
 738                 RETURN(maj_stat);
 739         }
 740
 741         if (gss_check_seq_num(&rsci->seqdata, gc->gc_seq)) {
 742                 CERROR("discard request %p with old seq_num %u\n",
 743                         req, gc->gc_seq);
 744                 RETURN(GSS_S_DUPLICATE_TOKEN);
 745         }
 746
 747         RETURN(GSS_S_COMPLETE);
 748 }
 749
 750 static int
 751 gss_svc_unseal_request(struct ptlrpc_request *req,
 752                        struct rsc *rsci,
 753                        struct rpc_gss_wire_cred *gc,
 754                        __u32 *vp, __u32 vlen)
 755 {
 756         struct ptlrpcs_wire_hdr *sec_hdr;
 757         struct gss_ctx *ctx = rsci->mechctx;
 758         rawobj_t cipher_text, plain_text;
 759         __u32 major;
 760         ENTRY;
 761
 762         sec_hdr = (struct ptlrpcs_wire_hdr *) req->rq_reqbuf;
 763
 764         if (vlen < 4) {
 765                 CERROR("vlen only %u\n", vlen);
 766                 RETURN(GSS_S_CALL_BAD_STRUCTURE);
 767         }
 768
 769         cipher_text.len = le32_to_cpu(*vp++);
 770         cipher_text.data = (__u8 *) vp;
 771         vlen -= 4;
 772
 773         if (cipher_text.len > vlen) {
 774                 CERROR("cipher claimed %u while buf only %u\n",
 775                         cipher_text.len, vlen);
 776                 RETURN(GSS_S_CALL_BAD_STRUCTURE);
 777         }
 778
 779         plain_text = cipher_text;
 780
 781         major = kgss_unwrap(ctx, GSS_C_QOP_DEFAULT, &cipher_text, &plain_text);
 782         if (major) {
 783                 CERROR("unwrap error 0x%x\n", major);
 784                 RETURN(major);
 785         }
 786
 787         if (gss_check_seq_num(&rsci->seqdata, gc->gc_seq)) {
 788                 CERROR("discard request %p with old seq_num %u\n",
 789                         req, gc->gc_seq);
 790                 RETURN(GSS_S_DUPLICATE_TOKEN);
 791         }
 792
 793         req->rq_reqmsg = (struct lustre_msg *) (vp);
 794         req->rq_reqlen = plain_text.len;
 795
 796         CDEBUG(D_SEC, "msg len %d\n", req->rq_reqlen);
 797
 798         RETURN(GSS_S_COMPLETE);
 799 }
 800
 801 static int
 802 gss_pack_err_notify(struct ptlrpc_request *req,
 803                     __u32 major, __u32 minor)
 804 {
 805         struct gss_svc_data *svcdata = req->rq_sec_svcdata;
 806         __u32 reslen, *resp, *reslenp;
 807         char  nidstr[PTL_NALFMT_SIZE];
 808         const __u32 secdata_len = 7 * 4;
 809         int rc;
 810         ENTRY;
 811
 812         OBD_FAIL_RETURN(OBD_FAIL_SVCGSS_ERR_NOTIFY|OBD_FAIL_ONCE, -EINVAL);
 813
 814         LASSERT(svcdata);
 815         svcdata->is_err_notify = 1;
 816         svcdata->reserve_len = 7 * 4;
 817
 818         rc = lustre_pack_reply(req, 0, NULL, NULL);
 819         if (rc) {
 820                 CERROR("could not pack reply, err %d\n", rc);
 821                 RETURN(rc);
 822         }
 823
 824         LASSERT(req->rq_reply_state);
 825         LASSERT(req->rq_reply_state->rs_repbuf);
 826         LASSERT(req->rq_reply_state->rs_repbuf_len >= secdata_len);
 827         resp = (__u32 *) req->rq_reply_state->rs_repbuf;
 828
 829         /* header */
 830         *resp++ = cpu_to_le32(PTLRPC_SEC_GSS);
 831         *resp++ = cpu_to_le32(PTLRPC_SEC_TYPE_NONE);
 832         *resp++ = cpu_to_le32(req->rq_replen);
 833         reslenp = resp++;
 834
 835         /* skip lustre msg */
 836         resp += req->rq_replen / 4;
 837         reslen = svcdata->reserve_len;
 838
 839         /* gss replay:
 840          * version, subflavor, notify, major, minor,
 841          * obj1(fake), obj2(fake)
 842          */
 843         *resp++ = cpu_to_le32(PTLRPC_SEC_GSS_VERSION);
 844         *resp++ = cpu_to_le32(PTLRPC_SEC_GSS_KRB5I);
 845         *resp++ = cpu_to_le32(PTLRPC_GSS_PROC_ERR);
 846         *resp++ = cpu_to_le32(major);
 847         *resp++ = cpu_to_le32(minor);
 848         *resp++ = 0;
 849         *resp++ = 0;
 850         reslen -= (4 * 4);
 851         /* the actual sec data length */
 852         *reslenp = cpu_to_le32(secdata_len);
 853
 854         req->rq_reply_state->rs_repdata_len += (secdata_len);
 855         CWARN("prepare gss error notify(0x%x/0x%x) to %s\n", major, minor,
 856                portals_nid2str(req->rq_peer.peer_ni->pni_number,
 857                                req->rq_peer.peer_id.nid, nidstr));
 858         RETURN(0);
 859 }
 860
 861 static int
 862 gss_svcsec_handle_init(struct ptlrpc_request *req,
 863                        struct rpc_gss_wire_cred *gc,
 864                        __u32 *secdata, __u32 seclen,
 865                        enum ptlrpcs_error *res)
 866 {
 867         struct gss_svc_data *svcdata = req->rq_sec_svcdata;
 868         struct rsc          *rsci;
 869         struct rsi          *rsikey, *rsip;
 870         rawobj_t             tmpobj;
 871         __u32 reslen,       *resp, *reslenp;
 872         char                 nidstr[PTL_NALFMT_SIZE];
 873         int                  rc;
 874         ENTRY;
 875
 876         LASSERT(svcdata);
 877
 878         CWARN("processing gss init(%d) request from %s\n", gc->gc_proc,
 879                portals_nid2str(req->rq_peer.peer_ni->pni_number,
 880                                req->rq_peer.peer_id.nid, nidstr));
 881
 882         *res = PTLRPCS_BADCRED;
 883         OBD_FAIL_RETURN(OBD_FAIL_SVCGSS_INIT_REQ|OBD_FAIL_ONCE, SVC_DROP);
 884
 885         if (gc->gc_proc == RPC_GSS_PROC_INIT &&
 886             gc->gc_ctx.len != 0) {
 887                 CERROR("proc %d, ctx_len %d: not really init?\n",
 888                 gc->gc_proc == RPC_GSS_PROC_INIT, gc->gc_ctx.len);
 889                 RETURN(SVC_DROP);
 890         }
 891
 892         OBD_ALLOC(rsikey, sizeof(*rsikey));
 893         if (!rsikey) {
 894                 CERROR("out of memory\n");
 895                 RETURN(SVC_DROP);
 896         }
 897         cache_init(&rsikey->h);
 898
 899         if (rawobj_dup(&rsikey->in_handle, &gc->gc_ctx)) {
 900                 CERROR("fail to dup context handle\n");
 901                 GOTO(out_rsikey, rc = SVC_DROP);
 902         }
 903         *res = PTLRPCS_BADVERF;
 904         if (rawobj_extract(&tmpobj, &secdata, &seclen)) {
 905                 CERROR("can't extract token\n");
 906                 GOTO(out_rsikey, rc = SVC_DROP);
 907         }
 908         if (rawobj_dup(&rsikey->in_token, &tmpobj)) {
 909                 CERROR("can't duplicate token\n");
 910                 GOTO(out_rsikey, rc = SVC_DROP);
 911         }
 912
 913         rsikey->naltype = (__u32) req->rq_peer.peer_ni->pni_number;
 914         rsikey->netid = 0;
 915         rsikey->nid = (__u64) req->rq_peer.peer_id.nid;
 916
 917         rsip = gssd_upcall(rsikey, &my_chandle);
 918         if (!rsip) {
 919                 CERROR("error in gssd_upcall.\n");
 920                 GOTO(out_rsikey, rc = SVC_DROP);
 921         }
 922
 923         rsci = gss_svc_searchbyctx(&rsip->out_handle);
 924         if (!rsci) {
 925                 CERROR("rsci still not mature yet?\n");
 926                 GOTO(out_rsip, rc = SVC_DROP);
 927         }
 928         CWARN("svcsec create gss context %p(%u@%s)\n",
 929                rsci, rsci->cred.vc_uid,
 930                portals_nid2str(req->rq_peer.peer_ni->pni_number,
 931                                req->rq_peer.peer_id.nid, nidstr));
 932
 933         svcdata->is_init = 1;
 934         svcdata->reserve_len = 6 * 4 +
 935                 size_round4(rsip->out_handle.len) +
 936                 size_round4(rsip->out_token.len);
 937
 938         rc = lustre_pack_reply(req, 0, NULL, NULL);
 939         if (rc) {
 940                 CERROR("failed to pack reply, rc = %d\n", rc);
 941                 GOTO(out, rc = SVC_DROP);
 942         }
 943
 944         /* header */
 945         resp = (__u32 *) req->rq_reply_state->rs_repbuf;
 946         *resp++ = cpu_to_le32(PTLRPC_SEC_GSS);
 947         *resp++ = cpu_to_le32(PTLRPC_SEC_TYPE_NONE);
 948         *resp++ = cpu_to_le32(req->rq_replen);
 949         reslenp = resp++;
 950
 951         resp += req->rq_replen / 4;
 952         reslen = svcdata->reserve_len;
 953
 954         /* gss reply:
 955          * status, major, minor, seq, out_handle, out_token
 956          */
 957         *resp++ = cpu_to_le32(PTLRPCS_OK);
 958         *resp++ = cpu_to_le32(rsip->major_status);
 959         *resp++ = cpu_to_le32(rsip->minor_status);
 960         *resp++ = cpu_to_le32(GSS_SEQ_WIN);
 961         reslen -= (4 * 4);
 962         if (rawobj_serialize(&rsip->out_handle,
 963                              &resp, &reslen))
 964                 LBUG();
 965         if (rawobj_serialize(&rsip->out_token,
 966                              &resp, &reslen))
 967                 LBUG();
 968         /* the actual sec data length */
 969         *reslenp = cpu_to_le32(svcdata->reserve_len - reslen);
 970
 971         req->rq_reply_state->rs_repdata_len += le32_to_cpu(*reslenp);
 972         CDEBUG(D_SEC, "req %p: msgsize %d, authsize %d, "
 973                "total size %d\n", req, req->rq_replen,
 974                le32_to_cpu(*reslenp),
 975                req->rq_reply_state->rs_repdata_len);
 976
 977         *res = PTLRPCS_OK;
 978
 979         req->rq_auth_uid = rsci->cred.vc_uid;
 980         req->rq_remote_realm = rsci->remote_realm;
 981         req->rq_mapped_uid = rsci->mapped_uid;
 982
 983         /* This is simplified since right now we doesn't support
 984          * INIT_CONTINUE yet.
 985          */
 986         if (gc->gc_proc == RPC_GSS_PROC_INIT) {
 987                 struct ptlrpcs_wire_hdr *hdr;
 988
 989                 hdr = buf_to_sec_hdr(req->rq_reqbuf);
 990                 req->rq_reqmsg = buf_to_lustre_msg(req->rq_reqbuf);
 991                 req->rq_reqlen = hdr->msg_len;
 992
 993                 rc = SVC_LOGIN;
 994         } else
 995                 rc = SVC_COMPLETE;
 996
 997 out:
 998         rsc_put(&rsci->h, &rsc_cache);
 999 out_rsip:
1000         rsi_put(&rsip->h, &rsi_cache);
1001 out_rsikey:
1002         rsi_put(&rsikey->h, &rsi_cache);
1003
1004         RETURN(rc);
1005 }
1006
1007 static int
1008 gss_svcsec_handle_data(struct ptlrpc_request *req,
1009                        struct rpc_gss_wire_cred *gc,
1010                        __u32 *secdata, __u32 seclen,
1011                        enum ptlrpcs_error *res)
1012 {
1013         struct rsc          *rsci;
1014         char                 nidstr[PTL_NALFMT_SIZE];
1015         __u32                major;
1016         int                  rc;
1017         ENTRY;
1018
1019         *res = PTLRPCS_GSS_CREDPROBLEM;
1020
1021         rsci = gss_svc_searchbyctx(&gc->gc_ctx);
1022         if (!rsci) {
1023                 CWARN("Invalid gss context handle from %s\n",
1024                        portals_nid2str(req->rq_peer.peer_ni->pni_number,
1025                                        req->rq_peer.peer_id.nid, nidstr));
1026                 major = GSS_S_NO_CONTEXT;
1027                 goto notify_err;
1028         }
1029
1030         switch (gc->gc_svc) {
1031         case PTLRPC_GSS_SVC_INTEGRITY:
1032                 major = gss_svc_verify_request(req, rsci, gc, secdata, seclen);
1033                 if (major == GSS_S_COMPLETE)
1034                         break;
1035
1036                 CWARN("fail in verify:0x%x: ctx %p@%s\n", major, rsci,
1037                        portals_nid2str(req->rq_peer.peer_ni->pni_number,
1038                                        req->rq_peer.peer_id.nid, nidstr));
1039                 goto notify_err;
1040         case PTLRPC_GSS_SVC_PRIVACY:
1041                 major = gss_svc_unseal_request(req, rsci, gc, secdata, seclen);
1042                 if (major == GSS_S_COMPLETE)
1043                         break;
1044
1045                 CWARN("fail in decrypt:0x%x: ctx %p@%s\n", major, rsci,
1046                        portals_nid2str(req->rq_peer.peer_ni->pni_number,
1047                                        req->rq_peer.peer_id.nid, nidstr));
1048                 goto notify_err;
1049         default:
1050                 CERROR("unsupported gss service %d\n", gc->gc_svc);
1051                 GOTO(out, rc = SVC_DROP);
1052         }
1053
1054         req->rq_auth_uid = rsci->cred.vc_uid;
1055         req->rq_remote_realm = rsci->remote_realm;
1056         req->rq_mapped_uid = rsci->mapped_uid;
1057
1058         *res = PTLRPCS_OK;
1059         GOTO(out, rc = SVC_OK);
1060
1061 notify_err:
1062         if (gss_pack_err_notify(req, major, 0))
1063                 rc = SVC_DROP;
1064         else
1065                 rc = SVC_COMPLETE;
1066 out:
1067         if (rsci)
1068                 rsc_put(&rsci->h, &rsc_cache);
1069         RETURN(rc);
1070 }
1071
1072 static int
1073 gss_svcsec_handle_destroy(struct ptlrpc_request *req,
1074                           struct rpc_gss_wire_cred *gc,
1075                           __u32 *secdata, __u32 seclen,
1076                           enum ptlrpcs_error *res)
1077 {
1078         struct gss_svc_data *svcdata = req->rq_sec_svcdata;
1079         struct rsc          *rsci;
1080         char                 nidstr[PTL_NALFMT_SIZE];
1081         int                  rc;
1082         ENTRY;
1083
1084         LASSERT(svcdata);
1085         *res = PTLRPCS_GSS_CREDPROBLEM;
1086
1087         rsci = gss_svc_searchbyctx(&gc->gc_ctx);
1088         if (!rsci) {
1089                 CWARN("invalid gss context handle for destroy.\n");
1090                 RETURN(SVC_DROP);
1091         }
1092
1093         if (gc->gc_svc != PTLRPC_GSS_SVC_INTEGRITY) {
1094                 CERROR("service %d is not supported in destroy.\n",
1095                         gc->gc_svc);
1096                 GOTO(out, rc = SVC_DROP);
1097         }
1098
1099         *res = gss_svc_verify_request(req, rsci, gc, secdata, seclen);
1100         if (*res)
1101                 GOTO(out, rc = SVC_DROP);
1102
1103         /* compose reply, which is actually nothing */
1104         svcdata->is_fini = 1;
1105         if (lustre_pack_reply(req, 0, NULL, NULL))
1106                 GOTO(out, rc = SVC_DROP);
1107
1108         CWARN("svcsec destroy gss context %p(%u@%s)\n",
1109                rsci, rsci->cred.vc_uid,
1110                portals_nid2str(req->rq_peer.peer_ni->pni_number,
1111                                req->rq_peer.peer_id.nid, nidstr));
1112
1113         set_bit(CACHE_NEGATIVE, &rsci->h.flags);
1114         *res = PTLRPCS_OK;
1115         rc = SVC_LOGOUT;
1116 out:
1117         rsc_put(&rsci->h, &rsc_cache);
1118         RETURN(rc);
1119 }
1120
1121 /*
1122  * let incomming request go through security check:
1123  *  o context establishment: invoke user space helper
1124  *  o data exchange: verify/decrypt
1125  *  o context destruction: mark context invalid
1126  *
1127  * in most cases, error will result to drop the packet silently.
1128  */
1129 static int
1130 gss_svcsec_accept(struct ptlrpc_request *req, enum ptlrpcs_error *res)
1131 {
1132         struct gss_svc_data *svcdata;
1133         struct rpc_gss_wire_cred *gc;
1134         struct ptlrpcs_wire_hdr *sec_hdr;
1135         __u32 seclen, *secdata, version, subflavor;
1136         int rc;
1137         ENTRY;
1138
1139         CDEBUG(D_SEC, "request %p\n", req);
1140         LASSERT(req->rq_reqbuf);
1141         LASSERT(req->rq_reqbuf_len);
1142
1143         *res = PTLRPCS_BADCRED;
1144
1145         sec_hdr = buf_to_sec_hdr(req->rq_reqbuf);
1146         LASSERT(sec_hdr->flavor == PTLRPC_SEC_GSS);
1147
1148         seclen = req->rq_reqbuf_len - sizeof(*sec_hdr) - sec_hdr->msg_len;
1149         secdata = (__u32 *) buf_to_sec_data(req->rq_reqbuf);
1150
1151         if (sec_hdr->sec_len > seclen) {
1152                 CERROR("seclen %d, while max buf %d\n",
1153                         sec_hdr->sec_len, seclen);
1154                 RETURN(SVC_DROP);
1155         }
1156
1157         if (seclen < 6 * 4) {
1158                 CERROR("sec size %d too small\n", seclen);
1159                 RETURN(SVC_DROP);
1160         }
1161
1162         LASSERT(!req->rq_sec_svcdata);
1163         OBD_ALLOC(svcdata, sizeof(*svcdata));
1164         if (!svcdata) {
1165                 CERROR("fail to alloc svcdata\n");
1166                 RETURN(SVC_DROP);
1167         }
1168         req->rq_sec_svcdata = svcdata;
1169         gc = &svcdata->clcred;
1170
1171         /* Now secdata/seclen is what we want to parse
1172          */
1173         version = le32_to_cpu(*secdata++);      /* version */
1174         subflavor = le32_to_cpu(*secdata++);    /* subflavor */
1175         gc->gc_proc = le32_to_cpu(*secdata++);  /* proc */
1176         gc->gc_seq = le32_to_cpu(*secdata++);   /* seq */
1177         gc->gc_svc = le32_to_cpu(*secdata++);   /* service */
1178         seclen -= 5 * 4;
1179
1180         CDEBUG(D_SEC, "wire gss_hdr: %u/%u/%u/%u/%u\n",
1181                version, subflavor, gc->gc_proc, gc->gc_seq, gc->gc_svc);
1182
1183         if (version != PTLRPC_SEC_GSS_VERSION) {
1184                 CERROR("gss version mismatch: %d - %d\n",
1185                         version, PTLRPC_SEC_GSS_VERSION);
1186                 GOTO(err_free, rc = SVC_DROP);
1187         }
1188
1189         if (rawobj_extract(&gc->gc_ctx, &secdata, &seclen)) {
1190                 CERROR("fail to obtain gss context handle\n");
1191                 GOTO(err_free, rc = SVC_DROP);
1192         }
1193
1194         *res = PTLRPCS_BADVERF;
1195         switch(gc->gc_proc) {
1196         case RPC_GSS_PROC_INIT:
1197         case RPC_GSS_PROC_CONTINUE_INIT:
1198                 rc = gss_svcsec_handle_init(req, gc, secdata, seclen, res);
1199                 break;
1200         case RPC_GSS_PROC_DATA:
1201                 rc = gss_svcsec_handle_data(req, gc, secdata, seclen, res);
1202                 break;
1203         case RPC_GSS_PROC_DESTROY:
1204                 rc = gss_svcsec_handle_destroy(req, gc, secdata, seclen, res);
1205                 break;
1206         default:
1207                 rc = SVC_DROP;
1208                 LBUG();
1209         }
1210
1211 err_free:
1212         if (rc == SVC_DROP && req->rq_sec_svcdata) {
1213                 OBD_FREE(req->rq_sec_svcdata, sizeof(struct gss_svc_data));
1214                 req->rq_sec_svcdata = NULL;
1215         }
1216
1217         RETURN(rc);
1218 }
1219
1220 static int
1221 gss_svcsec_authorize(struct ptlrpc_request *req)
1222 {
1223         struct ptlrpc_reply_state *rs = req->rq_reply_state;
1224         struct gss_svc_data *gsd = (struct gss_svc_data *)req->rq_sec_svcdata;
1225         struct rpc_gss_wire_cred  *gc = &gsd->clcred;
1226         struct rsc                *rscp;
1227         struct ptlrpcs_wire_hdr   *sec_hdr;
1228         rawobj_buf_t               msg_buf;
1229         rawobj_t                   cipher_buf;
1230         __u32                     *vp, *vpsave, major, vlen, seclen;
1231         rawobj_t                   lmsg, mic;
1232         int                        ret;
1233         ENTRY;
1234
1235         LASSERT(rs);
1236         LASSERT(rs->rs_repbuf);
1237         LASSERT(gsd);
1238
1239         if (gsd->is_init || gsd->is_init_continue ||
1240             gsd->is_err_notify || gsd->is_fini) {
1241                 /* nothing to do in these cases */
1242                 CDEBUG(D_SEC, "req %p: init/fini/err\n", req);
1243                 RETURN(0);
1244         }
1245
1246         if (gc->gc_proc != RPC_GSS_PROC_DATA) {
1247                 CERROR("proc %d not support\n", gc->gc_proc);
1248                 RETURN(-EINVAL);
1249         }
1250
1251         rscp = gss_svc_searchbyctx(&gc->gc_ctx);
1252         if (!rscp) {
1253                 CERROR("ctx disapeared under us?\n");
1254                 RETURN(-EINVAL);
1255         }
1256
1257         sec_hdr = (struct ptlrpcs_wire_hdr *) rs->rs_repbuf;
1258         switch (gc->gc_svc) {
1259         case  PTLRPC_GSS_SVC_INTEGRITY:
1260                 /* prepare various pointers */
1261                 lmsg.len = req->rq_replen;
1262                 lmsg.data = (__u8 *) (rs->rs_repbuf + sizeof(*sec_hdr));
1263                 vp = (__u32 *) (lmsg.data + lmsg.len);
1264                 vlen = rs->rs_repbuf_len - sizeof(*sec_hdr) - lmsg.len;
1265                 seclen = vlen;
1266
1267                 sec_hdr->flavor = cpu_to_le32(PTLRPC_SEC_GSS);
1268                 sec_hdr->sectype = cpu_to_le32(PTLRPC_SEC_TYPE_AUTH);
1269                 sec_hdr->msg_len = cpu_to_le32(req->rq_replen);
1270
1271                 /* standard gss hdr */
1272                 LASSERT(vlen >= 7 * 4);
1273                 *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_VERSION);
1274                 *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_KRB5I);
1275                 *vp++ = cpu_to_le32(RPC_GSS_PROC_DATA);
1276                 *vp++ = cpu_to_le32(gc->gc_seq);
1277                 *vp++ = cpu_to_le32(PTLRPC_GSS_SVC_INTEGRITY);
1278                 *vp++ = 0;      /* fake ctx handle */
1279                 vpsave = vp++;  /* reserve size */
1280                 vlen -= 7 * 4;
1281
1282                 mic.len = vlen;
1283                 mic.data = (char *) vp;
1284
1285                 major = kgss_get_mic(rscp->mechctx, 0, &lmsg, &mic);
1286                 if (major) {
1287                         CERROR("fail to get MIC: 0x%x\n", major);
1288                         GOTO(out, ret = -EINVAL);
1289                 }
1290                 *vpsave = cpu_to_le32(mic.len);
1291                 seclen = seclen - vlen + mic.len;
1292                 sec_hdr->sec_len = cpu_to_le32(seclen);
1293                 rs->rs_repdata_len += size_round(seclen);
1294                 break;
1295         case  PTLRPC_GSS_SVC_PRIVACY:
1296                 vp = (__u32 *) (rs->rs_repbuf + sizeof(*sec_hdr));
1297                 vlen = rs->rs_repbuf_len - sizeof(*sec_hdr);
1298                 seclen = vlen;
1299
1300                 sec_hdr->flavor = cpu_to_le32(PTLRPC_SEC_GSS);
1301                 sec_hdr->sectype = cpu_to_le32(PTLRPC_SEC_TYPE_PRIV);
1302                 sec_hdr->msg_len = cpu_to_le32(0);
1303
1304                 /* standard gss hdr */
1305                 LASSERT(vlen >= 7 * 4);
1306                 *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_VERSION);
1307                 *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_KRB5I);
1308                 *vp++ = cpu_to_le32(RPC_GSS_PROC_DATA);
1309                 *vp++ = cpu_to_le32(gc->gc_seq);
1310                 *vp++ = cpu_to_le32(PTLRPC_GSS_SVC_PRIVACY);
1311                 *vp++ = 0;      /* fake ctx handle */
1312                 vpsave = vp++;  /* reserve size */
1313                 vlen -= 7 * 4;
1314
1315                 msg_buf.buf = (__u8 *) rs->rs_msg - GSS_PRIVBUF_PREFIX_LEN;
1316                 msg_buf.buflen = req->rq_replen + GSS_PRIVBUF_PREFIX_LEN +
1317                                  GSS_PRIVBUF_SUFFIX_LEN;
1318                 msg_buf.dataoff = GSS_PRIVBUF_PREFIX_LEN;
1319                 msg_buf.datalen = req->rq_replen;
1320
1321                 cipher_buf.data = (__u8 *) vp;
1322                 cipher_buf.len = vlen;
1323
1324                 major = kgss_wrap(rscp->mechctx, GSS_C_QOP_DEFAULT,
1325                                 &msg_buf, &cipher_buf);
1326                 if (major) {
1327                         CERROR("failed to wrap: 0x%x\n", major);
1328                         GOTO(out, ret = -EINVAL);
1329                 }
1330
1331                 *vpsave = cpu_to_le32(cipher_buf.len);
1332                 seclen = seclen - vlen + cipher_buf.len;
1333                 sec_hdr->sec_len = cpu_to_le32(seclen);
1334                 rs->rs_repdata_len += size_round(seclen);
1335                 break;
1336         default:
1337                 CERROR("Unknown service %d\n", gc->gc_svc);
1338                 GOTO(out, ret = -EINVAL);
1339         }
1340         ret = 0;
1341 out:
1342         rsc_put(&rscp->h, &rsc_cache);
1343
1344         RETURN(ret);
1345 }
1346
1347 static
1348 void gss_svcsec_cleanup_req(struct ptlrpc_svcsec *svcsec,
1349                             struct ptlrpc_request *req)
1350 {
1351         struct gss_svc_data *gsd = (struct gss_svc_data *) req->rq_sec_svcdata;
1352
1353         if (!gsd) {
1354                 CDEBUG(D_SEC, "no svc_data present. do nothing\n");
1355                 return;
1356         }
1357
1358         /* gsd->clclred.gc_ctx is NOT allocated, just set pointer
1359          * to the incoming packet buffer, so don't need free it
1360          */
1361         OBD_FREE(gsd, sizeof(*gsd));
1362         req->rq_sec_svcdata = NULL;
1363         return;
1364 }
1365
1366 static
1367 int gss_svcsec_est_payload(struct ptlrpc_svcsec *svcsec,
1368                            struct ptlrpc_request *req,
1369                            int msgsize)
1370 {
1371         struct gss_svc_data *svcdata = req->rq_sec_svcdata;
1372         ENTRY;
1373
1374         /* just return the pre-set reserve_len for init/fini/err cases.
1375          */
1376         LASSERT(svcdata);
1377         if (svcdata->is_init) {
1378                 CDEBUG(D_SEC, "is_init, reserver size %d(%d)\n",
1379                        size_round(svcdata->reserve_len),
1380                        svcdata->reserve_len);
1381                 LASSERT(svcdata->reserve_len);
1382                 LASSERT(svcdata->reserve_len % 4 == 0);
1383                 RETURN(size_round(svcdata->reserve_len));
1384         } else if (svcdata->is_err_notify) {
1385                 CDEBUG(D_SEC, "is_err_notify, reserver size %d(%d)\n",
1386                        size_round(svcdata->reserve_len),
1387                        svcdata->reserve_len);
1388                 RETURN(size_round(svcdata->reserve_len));
1389         } else if (svcdata->is_fini) {
1390                 CDEBUG(D_SEC, "is_fini, reserver size 0\n");
1391                 RETURN(0);
1392         } else {
1393                 if (svcdata->clcred.gc_svc == PTLRPC_GSS_SVC_NONE ||
1394                     svcdata->clcred.gc_svc == PTLRPC_GSS_SVC_INTEGRITY)
1395                         RETURN(size_round(GSS_MAX_AUTH_PAYLOAD));
1396                 else if (svcdata->clcred.gc_svc == PTLRPC_GSS_SVC_PRIVACY)
1397                         RETURN(size_round16(GSS_MAX_AUTH_PAYLOAD + msgsize +
1398                                             GSS_PRIVBUF_PREFIX_LEN +
1399                                             GSS_PRIVBUF_SUFFIX_LEN));
1400                 else {
1401                         CERROR("unknown gss svc %u\n", svcdata->clcred.gc_svc);
1402                         *((int *)0) = 0;
1403                         LBUG();
1404                 }
1405         }
1406         RETURN(0);
1407 }
1408
1409 int gss_svcsec_alloc_repbuf(struct ptlrpc_svcsec *svcsec,
1410                             struct ptlrpc_request *req,
1411                             int msgsize)
1412 {
1413         struct gss_svc_data *gsd = (struct gss_svc_data *) req->rq_sec_svcdata;
1414         struct ptlrpc_reply_state *rs;
1415         int msg_payload, sec_payload;
1416         int privacy, rc;
1417         ENTRY;
1418
1419         /* determine the security type: none/auth or priv, we have
1420          * different pack scheme for them.
1421          * init/fini/err will always be treated as none/auth.
1422          */
1423         LASSERT(gsd);
1424         if (!gsd->is_init && !gsd->is_init_continue &&
1425             !gsd->is_fini && !gsd->is_err_notify &&
1426             gsd->clcred.gc_svc == PTLRPC_GSS_SVC_PRIVACY)
1427                 privacy = 1;
1428         else
1429                 privacy = 0;
1430
1431         msg_payload = privacy ? 0 : msgsize;
1432         sec_payload = gss_svcsec_est_payload(svcsec, req, msgsize);
1433
1434         rc = svcsec_alloc_reply_state(req, msg_payload, sec_payload);
1435         if (rc)
1436                 RETURN(rc);
1437
1438         rs = req->rq_reply_state;
1439         LASSERT(rs);
1440         rs->rs_msg_len = msgsize;
1441
1442         if (privacy) {
1443                 /* we can choose to let msg simply point to the rear of the
1444                  * buffer, which lead to buffer overlap when doing encryption.
1445                  * usually it's ok and it indeed passed all existing tests.
1446                  * but not sure if there will be subtle problems in the future.
1447                  * so right now we choose to alloc another new buffer. we'll
1448                  * see how it works.
1449                  */
1450 #if 0
1451                 rs->rs_msg = (struct lustre_msg *)
1452                              (rs->rs_repbuf + rs->rs_repbuf_len -
1453                               msgsize - GSS_PRIVBUF_SUFFIX_LEN);
1454 #endif
1455                 char *msgbuf;
1456
1457                 msgsize += GSS_PRIVBUF_PREFIX_LEN + GSS_PRIVBUF_SUFFIX_LEN;
1458                 OBD_ALLOC(msgbuf, msgsize);
1459                 if (!msgbuf) {
1460                         CERROR("can't alloc %d\n", msgsize);
1461                         svcsec_free_reply_state(rs);
1462                         req->rq_reply_state = NULL;
1463                         RETURN(-ENOMEM);
1464                 }
1465                 rs->rs_msg = (struct lustre_msg *)
1466                                 (msgbuf + GSS_PRIVBUF_PREFIX_LEN);
1467         }
1468
1469         req->rq_repmsg = rs->rs_msg;
1470
1471         RETURN(0);
1472 }
1473
1474 static
1475 void gss_svcsec_free_repbuf(struct ptlrpc_svcsec *svcsec,
1476                             struct ptlrpc_reply_state *rs)
1477 {
1478         unsigned long p1 = (unsigned long) rs->rs_msg;
1479         unsigned long p2 = (unsigned long) rs->rs_buf;
1480
1481         LASSERT(rs->rs_buf);
1482         LASSERT(rs->rs_msg);
1483         LASSERT(rs->rs_msg_len);
1484
1485         if (p1 < p2 || p1 >= p2 + rs->rs_buf_len) {
1486                 char *start = (char*) rs->rs_msg - GSS_PRIVBUF_PREFIX_LEN;
1487                 int size = rs->rs_msg_len + GSS_PRIVBUF_PREFIX_LEN +
1488                            GSS_PRIVBUF_SUFFIX_LEN;
1489                 OBD_FREE(start, size);
1490         }
1491
1492         svcsec_free_reply_state(rs);
1493 }
1494
1495 struct ptlrpc_svcsec svcsec_gss = {
1496         .pss_owner              = THIS_MODULE,
1497         .pss_name               = "GSS_SVCSEC",
1498         .pss_flavor             = {PTLRPC_SEC_GSS, 0},
1499         .accept                 = gss_svcsec_accept,
1500         .authorize              = gss_svcsec_authorize,
1501         .alloc_repbuf           = gss_svcsec_alloc_repbuf,
1502         .free_repbuf            = gss_svcsec_free_repbuf,
1503         .cleanup_req            = gss_svcsec_cleanup_req,
1504 };
1505
1506 /* XXX hacking */
1507 void lgss_svc_cache_purge_all(void)
1508 {
1509         cache_purge(&rsi_cache);
1510         cache_purge(&rsc_cache);
1511 }
1512 EXPORT_SYMBOL(lgss_svc_cache_purge_all);
1513
1514 void lgss_svc_cache_flush(__u32 uid)
1515 {
1516         rsc_flush(uid);
1517 }
1518 EXPORT_SYMBOL(lgss_svc_cache_flush);
1519
1520 int gss_svc_init(void)
1521 {
1522         int rc;
1523
1524         rc = svcsec_register(&svcsec_gss);
1525         if (!rc) {
1526                 cache_register(&rsc_cache);
1527                 cache_register(&rsi_cache);
1528         }
1529         return rc;
1530 }
1531
1532 void gss_svc_exit(void)
1533 {
1534         int rc;
1535         if ((rc = cache_unregister(&rsi_cache)))
1536                 CERROR("unregister rsi cache: %d\n", rc);
1537         if ((rc = cache_unregister(&rsc_cache)))
1538                 CERROR("unregister rsc cache: %d\n", rc);
1539         if ((rc = svcsec_unregister(&svcsec_gss)))
1540                 CERROR("unregister svcsec_gss: %d\n", rc);
1541 }