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((char *)item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
 139                 ^ hash_mem((char *)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, (char *)rsii->in_handle.data, rsii->in_handle.len);
 158         qword_addhex(bpp, blen, (char *)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((char *)rsci->handle.data,
 422                         rsci->handle.len, RSC_HASHBITS);
 423 }
 424
 425 static inline int
 426 rsc_match(struct rsc *new, struct rsc *tmp)
 427 {
 428         return rawobj_equal(&new->handle, &tmp->handle);
 429 }
 430
 431 static struct rsc *rsc_lookup(struct rsc *item, int set)
 432 {
 433         struct rsc *tmp = NULL;
 434         struct cache_head **hp, **head;
 435         head = &rsc_cache.hash_table[rsc_hash(item)];
 436         ENTRY;
 437
 438         if (set)
 439                 write_lock(&rsc_cache.hash_lock);
 440         else
 441                 read_lock(&rsc_cache.hash_lock);
 442         for (hp = head; *hp != NULL; hp = &tmp->h.next) {
 443                 tmp = container_of(*hp, struct rsc, h);
 444                 if (!rsc_match(tmp, item))
 445                         continue;
 446                 cache_get(&tmp->h);
 447                 if (!set) {
 448                         goto out_noset;
 449                 }
 450                 *hp = tmp->h.next;
 451                 tmp->h.next = NULL;
 452                 clear_bit(CACHE_HASHED, &tmp->h.flags);
 453                 rsc_put(&tmp->h, &rsc_cache);
 454                 goto out_set;
 455         }
 456         /* Didn't find anything */
 457         if (!set)
 458                 goto out_noset;
 459         rsc_cache.entries++;
 460 out_set:
 461         set_bit(CACHE_HASHED, &item->h.flags);
 462         item->h.next = *head;
 463         *head = &item->h;
 464         write_unlock(&rsc_cache.hash_lock);
 465         cache_fresh(&rsc_cache, &item->h, item->h.expiry_time);
 466         cache_get(&item->h);
 467         RETURN(item);
 468 out_noset:
 469         read_unlock(&rsc_cache.hash_lock);
 470         RETURN(tmp);
 471 }
 472
 473 static int rsc_parse(struct cache_detail *cd,
 474                      char *mesg, int mlen)
 475 {
 476         /* contexthandle expiry [ uid gid N <n gids> mechname
 477          * ...mechdata... ] */
 478         char *buf = mesg;
 479         int len, rv;
 480         struct rsc *rsci, *res = NULL;
 481         time_t expiry;
 482         int status = -EINVAL;
 483
 484         OBD_ALLOC(rsci, sizeof(*rsci));
 485         if (!rsci) {
 486                 CERROR("fail to alloc rsci\n");
 487                 return -ENOMEM;
 488         }
 489         cache_init(&rsci->h);
 490
 491         /* context handle */
 492         len = qword_get(&mesg, buf, mlen);
 493         if (len < 0) goto out;
 494         status = -ENOMEM;
 495         if (rawobj_alloc(&rsci->handle, buf, len))
 496                 goto out;
 497
 498         /* expiry */
 499         expiry = get_expiry(&mesg);
 500         status = -EINVAL;
 501         if (expiry == 0)
 502                 goto out;
 503
 504         /* remote flag */
 505         rv = get_int(&mesg, (int *)&rsci->remote_realm);
 506         if (rv) {
 507                 CERROR("fail to get remote flag\n");
 508                 goto out;
 509         }
 510
 511         /* mapped uid */
 512         rv = get_int(&mesg, (int *)&rsci->mapped_uid);
 513         if (rv) {
 514                 CERROR("fail to get mapped uid\n");
 515                 goto out;
 516         }
 517
 518         /* uid, or NEGATIVE */
 519         rv = get_int(&mesg, (int *)&rsci->cred.vc_uid);
 520         if (rv == -EINVAL)
 521                 goto out;
 522         if (rv == -ENOENT) {
 523                 CERROR("NOENT? set rsc entry negative\n");
 524                 set_bit(CACHE_NEGATIVE, &rsci->h.flags);
 525         } else {
 526                 struct gss_api_mech *gm;
 527                 rawobj_t tmp_buf;
 528                 __u64 ctx_expiry;
 529
 530                 /* gid */
 531                 if (get_int(&mesg, (int *)&rsci->cred.vc_gid))
 532                         goto out;
 533
 534                 /* mech name */
 535                 len = qword_get(&mesg, buf, mlen);
 536                 if (len < 0)
 537                         goto out;
 538                 gm = kgss_name_to_mech(buf);
 539                 status = -EOPNOTSUPP;
 540                 if (!gm)
 541                         goto out;
 542
 543                 status = -EINVAL;
 544                 /* mech-specific data: */
 545                 len = qword_get(&mesg, buf, mlen);
 546                 if (len < 0) {
 547                         kgss_mech_put(gm);
 548                         goto out;
 549                 }
 550                 tmp_buf.len = len;
 551                 tmp_buf.data = (unsigned char *)buf;
 552                 if (kgss_import_sec_context(&tmp_buf, gm, &rsci->mechctx)) {
 553                         kgss_mech_put(gm);
 554                         goto out;
 555                 }
 556
 557                 /* currently the expiry time passed down from user-space
 558                  * is invalid, here we retrive it from mech.
 559                  */
 560                 if (kgss_inquire_context(rsci->mechctx, &ctx_expiry)) {
 561                         CERROR("unable to get expire time, drop it\n");
 562                         set_bit(CACHE_NEGATIVE, &rsci->h.flags);
 563                         kgss_mech_put(gm);
 564                         goto out;
 565                 }
 566                 expiry = (time_t) ctx_expiry;
 567
 568                 kgss_mech_put(gm);
 569         }
 570         rsci->h.expiry_time = expiry;
 571         spin_lock_init(&rsci->seqdata.sd_lock);
 572         res = rsc_lookup(rsci, 1);
 573         rsc_put(&res->h, &rsc_cache);
 574         status = 0;
 575 out:
 576         if (rsci)
 577                 rsc_put(&rsci->h, &rsc_cache);
 578         return status;
 579 }
 580
 581 /*
 582  * flush all entries with @uid. @uid == -1 will match all.
 583  * we only know the uid, maybe netid/nid in the future, in all cases
 584  * we must search the whole cache
 585  */
 586 static void rsc_flush(uid_t uid)
 587 {
 588         struct cache_head **ch;
 589         struct rsc *rscp;
 590         int n;
 591         ENTRY;
 592
 593         write_lock(&rsc_cache.hash_lock);
 594         for (n = 0; n < RSC_HASHMAX; n++) {
 595                 for (ch = &rsc_cache.hash_table[n]; *ch;) {
 596                         rscp = container_of(*ch, struct rsc, h);
 597                         if (uid == -1 || rscp->cred.vc_uid == uid) {
 598                                 /* it seems simply set NEGATIVE doesn't work */
 599                                 *ch = (*ch)->next;
 600                                 rscp->h.next = NULL;
 601                                 cache_get(&rscp->h);
 602                                 set_bit(CACHE_NEGATIVE, &rscp->h.flags);
 603                                 clear_bit(CACHE_HASHED, &rscp->h.flags);
 604                                 CWARN("flush rsc %p for uid %u\n",
 605                                        rscp, rscp->cred.vc_uid);
 606                                 rsc_put(&rscp->h, &rsc_cache);
 607                                 rsc_cache.entries--;
 608                                 continue;
 609                         }
 610                         ch = &((*ch)->next);
 611                 }
 612         }
 613         write_unlock(&rsc_cache.hash_lock);
 614         EXIT;
 615 }
 616
 617 static struct cache_detail rsc_cache = {
 618         .hash_size      = RSC_HASHMAX,
 619         .hash_table     = rsc_table,
 620         .name           = "auth.ptlrpcs.context",
 621         .cache_put      = rsc_put,
 622         .cache_parse    = rsc_parse,
 623 };
 624
 625 static struct rsc *
 626 gss_svc_searchbyctx(rawobj_t *handle)
 627 {
 628         struct rsc rsci;
 629         struct rsc *found;
 630
 631         rsci.handle = *handle;
 632         found = rsc_lookup(&rsci, 0);
 633         if (!found)
 634                 return NULL;
 635
 636         if (cache_check(&rsc_cache, &found->h, NULL))
 637                 return NULL;
 638
 639         return found;
 640 }
 641
 642 struct gss_svc_data {
 643         /* decoded gss client cred: */
 644         struct rpc_gss_wire_cred        clcred;
 645         /* internal used status */
 646         unsigned int                    is_init:1,
 647                                         is_init_continue:1,
 648                                         is_err_notify:1,
 649                                         is_fini:1;
 650         int                             reserve_len;
 651 };
 652
 653 /* FIXME
 654  * again hacking: only try to give the svcgssd a chance to handle
 655  * upcalls.
 656  */
 657 struct cache_deferred_req* my_defer(struct cache_req *req)
 658 {
 659         yield();
 660         return NULL;
 661 }
 662 static struct cache_req my_chandle = {my_defer};
 663
 664 /* Implements sequence number algorithm as specified in RFC 2203. */
 665 static int
 666 gss_check_seq_num(struct gss_svc_seq_data *sd, __u32 seq_num)
 667 {
 668         int rc = 0;
 669
 670         spin_lock(&sd->sd_lock);
 671         if (seq_num > sd->sd_max) {
 672                 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
 673                         memset(sd->sd_win, 0, sizeof(sd->sd_win));
 674                         sd->sd_max = seq_num;
 675                 } else {
 676                         while(sd->sd_max < seq_num) {
 677                                 sd->sd_max++;
 678                                 __clear_bit(sd->sd_max % GSS_SEQ_WIN,
 679                                             sd->sd_win);
 680                         }
 681                 }
 682                 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
 683                 goto exit;
 684         } else if (seq_num + GSS_SEQ_WIN <= sd->sd_max) {
 685                 CERROR("seq %u too low: max %u, win %d\n",
 686                         seq_num, sd->sd_max, GSS_SEQ_WIN);
 687                 rc = 1;
 688                 goto exit;
 689         }
 690
 691         if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) {
 692                 CERROR("seq %u is replay: max %u, win %d\n",
 693                         seq_num, sd->sd_max, GSS_SEQ_WIN);
 694                 rc = 1;
 695         }
 696 exit:
 697         spin_unlock(&sd->sd_lock);
 698         return rc;
 699 }
 700
 701 static int
 702 gss_svc_verify_request(struct ptlrpc_request *req,
 703                        struct rsc *rsci,
 704                        struct rpc_gss_wire_cred *gc,
 705                        __u32 *vp, __u32 vlen)
 706 {
 707         struct ptlrpcs_wire_hdr *sec_hdr;
 708         struct gss_ctx *ctx = rsci->mechctx;
 709         __u32 maj_stat;
 710         rawobj_t msg;
 711         rawobj_t mic;
 712         ENTRY;
 713
 714         sec_hdr = (struct ptlrpcs_wire_hdr *) req->rq_reqbuf;
 715
 716         req->rq_reqmsg = (struct lustre_msg *) (req->rq_reqbuf + sizeof(*sec_hdr));
 717         req->rq_reqlen = sec_hdr->msg_len;
 718
 719         msg.len = sec_hdr->msg_len;
 720         msg.data = (__u8 *)req->rq_reqmsg;
 721
 722         mic.len = le32_to_cpu(*vp++);
 723         mic.data = (unsigned char *)vp;
 724         vlen -= 4;
 725
 726         if (mic.len > vlen) {
 727                 CERROR("checksum len %d, while buffer len %d\n",
 728                         mic.len, vlen);
 729                 RETURN(GSS_S_CALL_BAD_STRUCTURE);
 730         }
 731
 732         if (mic.len > 256) {
 733                 CERROR("invalid mic len %d\n", mic.len);
 734                 RETURN(GSS_S_CALL_BAD_STRUCTURE);
 735         }
 736
 737         maj_stat = kgss_verify_mic(ctx, &msg, &mic, NULL);
 738         if (maj_stat != GSS_S_COMPLETE) {
 739                 CERROR("MIC verification error: major %x\n", maj_stat);
 740                 RETURN(maj_stat);
 741         }
 742
 743         if (gss_check_seq_num(&rsci->seqdata, gc->gc_seq)) {
 744                 CERROR("discard request %p with old seq_num %u\n",
 745                         req, gc->gc_seq);
 746                 RETURN(GSS_S_DUPLICATE_TOKEN);
 747         }
 748
 749         RETURN(GSS_S_COMPLETE);
 750 }
 751
 752 static int
 753 gss_svc_unseal_request(struct ptlrpc_request *req,
 754                        struct rsc *rsci,
 755                        struct rpc_gss_wire_cred *gc,
 756                        __u32 *vp, __u32 vlen)
 757 {
 758         struct ptlrpcs_wire_hdr *sec_hdr;
 759         struct gss_ctx *ctx = rsci->mechctx;
 760         rawobj_t cipher_text, plain_text;
 761         __u32 major;
 762         ENTRY;
 763
 764         sec_hdr = (struct ptlrpcs_wire_hdr *) req->rq_reqbuf;
 765
 766         if (vlen < 4) {
 767                 CERROR("vlen only %u\n", vlen);
 768                 RETURN(GSS_S_CALL_BAD_STRUCTURE);
 769         }
 770
 771         cipher_text.len = le32_to_cpu(*vp++);
 772         cipher_text.data = (__u8 *) vp;
 773         vlen -= 4;
 774
 775         if (cipher_text.len > vlen) {
 776                 CERROR("cipher claimed %u while buf only %u\n",
 777                         cipher_text.len, vlen);
 778                 RETURN(GSS_S_CALL_BAD_STRUCTURE);
 779         }
 780
 781         plain_text = cipher_text;
 782
 783         major = kgss_unwrap(ctx, GSS_C_QOP_DEFAULT, &cipher_text, &plain_text);
 784         if (major) {
 785                 CERROR("unwrap error 0x%x\n", major);
 786                 RETURN(major);
 787         }
 788
 789         if (gss_check_seq_num(&rsci->seqdata, gc->gc_seq)) {
 790                 CERROR("discard request %p with old seq_num %u\n",
 791                         req, gc->gc_seq);
 792                 RETURN(GSS_S_DUPLICATE_TOKEN);
 793         }
 794
 795         req->rq_reqmsg = (struct lustre_msg *) (vp);
 796         req->rq_reqlen = plain_text.len;
 797
 798         CDEBUG(D_SEC, "msg len %d\n", req->rq_reqlen);
 799
 800         RETURN(GSS_S_COMPLETE);
 801 }
 802
 803 static int
 804 gss_pack_err_notify(struct ptlrpc_request *req,
 805                     __u32 major, __u32 minor)
 806 {
 807         struct gss_svc_data *svcdata = req->rq_sec_svcdata;
 808         __u32 reslen, *resp, *reslenp;
 809         char  nidstr[PTL_NALFMT_SIZE];
 810         const __u32 secdata_len = 7 * 4;
 811         int rc;
 812         ENTRY;
 813
 814         OBD_FAIL_RETURN(OBD_FAIL_SVCGSS_ERR_NOTIFY|OBD_FAIL_ONCE, -EINVAL);
 815
 816         LASSERT(svcdata);
 817         svcdata->is_err_notify = 1;
 818         svcdata->reserve_len = 7 * 4;
 819
 820         rc = lustre_pack_reply(req, 0, NULL, NULL);
 821         if (rc) {
 822                 CERROR("could not pack reply, err %d\n", rc);
 823                 RETURN(rc);
 824         }
 825
 826         LASSERT(req->rq_reply_state);
 827         LASSERT(req->rq_reply_state->rs_repbuf);
 828         LASSERT(req->rq_reply_state->rs_repbuf_len >= secdata_len);
 829         resp = (__u32 *) req->rq_reply_state->rs_repbuf;
 830
 831         /* header */
 832         *resp++ = cpu_to_le32(PTLRPC_SEC_GSS);
 833         *resp++ = cpu_to_le32(PTLRPC_SEC_TYPE_NONE);
 834         *resp++ = cpu_to_le32(req->rq_replen);
 835         reslenp = resp++;
 836
 837         /* skip lustre msg */
 838         resp += req->rq_replen / 4;
 839         reslen = svcdata->reserve_len;
 840
 841         /* gss replay:
 842          * version, subflavor, notify, major, minor,
 843          * obj1(fake), obj2(fake)
 844          */
 845         *resp++ = cpu_to_le32(PTLRPC_SEC_GSS_VERSION);
 846         *resp++ = cpu_to_le32(PTLRPC_SEC_GSS_KRB5I);
 847         *resp++ = cpu_to_le32(PTLRPC_GSS_PROC_ERR);
 848         *resp++ = cpu_to_le32(major);
 849         *resp++ = cpu_to_le32(minor);
 850         *resp++ = 0;
 851         *resp++ = 0;
 852         reslen -= (4 * 4);
 853         /* the actual sec data length */
 854         *reslenp = cpu_to_le32(secdata_len);
 855
 856         req->rq_reply_state->rs_repdata_len += (secdata_len);
 857         CWARN("prepare gss error notify(0x%x/0x%x) to %s\n", major, minor,
 858                portals_nid2str(req->rq_peer.peer_ni->pni_number,
 859                                req->rq_peer.peer_id.nid, nidstr));
 860         RETURN(0);
 861 }
 862
 863 static int
 864 gss_svcsec_handle_init(struct ptlrpc_request *req,
 865                        struct rpc_gss_wire_cred *gc,
 866                        __u32 *secdata, __u32 seclen,
 867                        enum ptlrpcs_error *res)
 868 {
 869         struct gss_svc_data *svcdata = req->rq_sec_svcdata;
 870         struct rsc          *rsci;
 871         struct rsi          *rsikey, *rsip;
 872         rawobj_t             tmpobj;
 873         __u32 reslen,       *resp, *reslenp;
 874         char                 nidstr[PTL_NALFMT_SIZE];
 875         int                  rc;
 876         ENTRY;
 877
 878         LASSERT(svcdata);
 879
 880         CWARN("processing gss init(%d) request from %s\n", gc->gc_proc,
 881                portals_nid2str(req->rq_peer.peer_ni->pni_number,
 882                                req->rq_peer.peer_id.nid, nidstr));
 883
 884         *res = PTLRPCS_BADCRED;
 885         OBD_FAIL_RETURN(OBD_FAIL_SVCGSS_INIT_REQ|OBD_FAIL_ONCE, SVC_DROP);
 886
 887         if (gc->gc_proc == RPC_GSS_PROC_INIT &&
 888             gc->gc_ctx.len != 0) {
 889                 CERROR("proc %d, ctx_len %d: not really init?\n",
 890                 gc->gc_proc == RPC_GSS_PROC_INIT, gc->gc_ctx.len);
 891                 RETURN(SVC_DROP);
 892         }
 893
 894         OBD_ALLOC(rsikey, sizeof(*rsikey));
 895         if (!rsikey) {
 896                 CERROR("out of memory\n");
 897                 RETURN(SVC_DROP);
 898         }
 899         cache_init(&rsikey->h);
 900
 901         if (rawobj_dup(&rsikey->in_handle, &gc->gc_ctx)) {
 902                 CERROR("fail to dup context handle\n");
 903                 GOTO(out_rsikey, rc = SVC_DROP);
 904         }
 905         *res = PTLRPCS_BADVERF;
 906         if (rawobj_extract(&tmpobj, &secdata, &seclen)) {
 907                 CERROR("can't extract token\n");
 908                 GOTO(out_rsikey, rc = SVC_DROP);
 909         }
 910         if (rawobj_dup(&rsikey->in_token, &tmpobj)) {
 911                 CERROR("can't duplicate token\n");
 912                 GOTO(out_rsikey, rc = SVC_DROP);
 913         }
 914
 915         rsikey->naltype = (__u32) req->rq_peer.peer_ni->pni_number;
 916         rsikey->netid = 0;
 917         rsikey->nid = (__u64) req->rq_peer.peer_id.nid;
 918
 919         rsip = gssd_upcall(rsikey, &my_chandle);
 920         if (!rsip) {
 921                 CERROR("error in gssd_upcall.\n");
 922                 GOTO(out_rsikey, rc = SVC_DROP);
 923         }
 924
 925         rsci = gss_svc_searchbyctx(&rsip->out_handle);
 926         if (!rsci) {
 927                 CERROR("rsci still not mature yet?\n");
 928
 929                 if (gss_pack_err_notify(req, GSS_S_FAILURE, 0))
 930                         rc = SVC_DROP;
 931                 else
 932                         rc = SVC_COMPLETE;
 933
 934                 GOTO(out_rsip, rc);
 935         }
 936         CWARN("svcsec create gss context %p(%u@%s)\n",
 937                rsci, rsci->cred.vc_uid,
 938                portals_nid2str(req->rq_peer.peer_ni->pni_number,
 939                                req->rq_peer.peer_id.nid, nidstr));
 940
 941         svcdata->is_init = 1;
 942         svcdata->reserve_len = 6 * 4 +
 943                 size_round4(rsip->out_handle.len) +
 944                 size_round4(rsip->out_token.len);
 945
 946         rc = lustre_pack_reply(req, 0, NULL, NULL);
 947         if (rc) {
 948                 CERROR("failed to pack reply, rc = %d\n", rc);
 949                 set_bit(CACHE_NEGATIVE, &rsci->h.flags);
 950                 GOTO(out, rc = SVC_DROP);
 951         }
 952
 953         /* header */
 954         resp = (__u32 *) req->rq_reply_state->rs_repbuf;
 955         *resp++ = cpu_to_le32(PTLRPC_SEC_GSS);
 956         *resp++ = cpu_to_le32(PTLRPC_SEC_TYPE_NONE);
 957         *resp++ = cpu_to_le32(req->rq_replen);
 958         reslenp = resp++;
 959
 960         resp += req->rq_replen / 4;
 961         reslen = svcdata->reserve_len;
 962
 963         /* gss reply:
 964          * status, major, minor, seq, out_handle, out_token
 965          */
 966         *resp++ = cpu_to_le32(PTLRPCS_OK);
 967         *resp++ = cpu_to_le32(rsip->major_status);
 968         *resp++ = cpu_to_le32(rsip->minor_status);
 969         *resp++ = cpu_to_le32(GSS_SEQ_WIN);
 970         reslen -= (4 * 4);
 971         if (rawobj_serialize(&rsip->out_handle,
 972                              &resp, &reslen))
 973                 LBUG();
 974         if (rawobj_serialize(&rsip->out_token,
 975                              &resp, &reslen))
 976                 LBUG();
 977         /* the actual sec data length */
 978         *reslenp = cpu_to_le32(svcdata->reserve_len - reslen);
 979
 980         req->rq_reply_state->rs_repdata_len += le32_to_cpu(*reslenp);
 981         CDEBUG(D_SEC, "req %p: msgsize %d, authsize %d, "
 982                "total size %d\n", req, req->rq_replen,
 983                le32_to_cpu(*reslenp),
 984                req->rq_reply_state->rs_repdata_len);
 985
 986         *res = PTLRPCS_OK;
 987
 988         req->rq_auth_uid = rsci->cred.vc_uid;
 989         req->rq_remote_realm = rsci->remote_realm;
 990         req->rq_mapped_uid = rsci->mapped_uid;
 991
 992         /* This is simplified since right now we doesn't support
 993          * INIT_CONTINUE yet.
 994          */
 995         if (gc->gc_proc == RPC_GSS_PROC_INIT) {
 996                 struct ptlrpcs_wire_hdr *hdr;
 997
 998                 hdr = buf_to_sec_hdr(req->rq_reqbuf);
 999                 req->rq_reqmsg = buf_to_lustre_msg(req->rq_reqbuf);
1000                 req->rq_reqlen = hdr->msg_len;
1001
1002                 rc = SVC_LOGIN;
1003         } else
1004                 rc = SVC_COMPLETE;
1005
1006 out:
1007         rsc_put(&rsci->h, &rsc_cache);
1008 out_rsip:
1009         rsi_put(&rsip->h, &rsi_cache);
1010 out_rsikey:
1011         rsi_put(&rsikey->h, &rsi_cache);
1012
1013         RETURN(rc);
1014 }
1015
1016 static int
1017 gss_svcsec_handle_data(struct ptlrpc_request *req,
1018                        struct rpc_gss_wire_cred *gc,
1019                        __u32 *secdata, __u32 seclen,
1020                        enum ptlrpcs_error *res)
1021 {
1022         struct rsc          *rsci;
1023         char                 nidstr[PTL_NALFMT_SIZE];
1024         __u32                major;
1025         int                  rc;
1026         ENTRY;
1027
1028         *res = PTLRPCS_GSS_CREDPROBLEM;
1029
1030         rsci = gss_svc_searchbyctx(&gc->gc_ctx);
1031         if (!rsci) {
1032                 CWARN("Invalid gss context handle from %s\n",
1033                        portals_nid2str(req->rq_peer.peer_ni->pni_number,
1034                                        req->rq_peer.peer_id.nid, nidstr));
1035                 major = GSS_S_NO_CONTEXT;
1036                 goto notify_err;
1037         }
1038
1039         switch (gc->gc_svc) {
1040         case PTLRPC_GSS_SVC_INTEGRITY:
1041                 major = gss_svc_verify_request(req, rsci, gc, secdata, seclen);
1042                 if (major == GSS_S_COMPLETE)
1043                         break;
1044
1045                 CWARN("fail in verify: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         case PTLRPC_GSS_SVC_PRIVACY:
1050                 major = gss_svc_unseal_request(req, rsci, gc, secdata, seclen);
1051                 if (major == GSS_S_COMPLETE)
1052                         break;
1053
1054                 CWARN("fail in decrypt:0x%x: ctx %p@%s\n", major, rsci,
1055                        portals_nid2str(req->rq_peer.peer_ni->pni_number,
1056                                        req->rq_peer.peer_id.nid, nidstr));
1057                 goto notify_err;
1058         default:
1059                 CERROR("unsupported gss service %d\n", gc->gc_svc);
1060                 GOTO(out, rc = SVC_DROP);
1061         }
1062
1063         req->rq_auth_uid = rsci->cred.vc_uid;
1064         req->rq_remote_realm = rsci->remote_realm;
1065         req->rq_mapped_uid = rsci->mapped_uid;
1066
1067         *res = PTLRPCS_OK;
1068         GOTO(out, rc = SVC_OK);
1069
1070 notify_err:
1071         if (gss_pack_err_notify(req, major, 0))
1072                 rc = SVC_DROP;
1073         else
1074                 rc = SVC_COMPLETE;
1075 out:
1076         if (rsci)
1077                 rsc_put(&rsci->h, &rsc_cache);
1078         RETURN(rc);
1079 }
1080
1081 static int
1082 gss_svcsec_handle_destroy(struct ptlrpc_request *req,
1083                           struct rpc_gss_wire_cred *gc,
1084                           __u32 *secdata, __u32 seclen,
1085                           enum ptlrpcs_error *res)
1086 {
1087         struct gss_svc_data *svcdata = req->rq_sec_svcdata;
1088         struct rsc          *rsci;
1089         char                 nidstr[PTL_NALFMT_SIZE];
1090         int                  rc;
1091         ENTRY;
1092
1093         LASSERT(svcdata);
1094         *res = PTLRPCS_GSS_CREDPROBLEM;
1095
1096         rsci = gss_svc_searchbyctx(&gc->gc_ctx);
1097         if (!rsci) {
1098                 CWARN("invalid gss context handle for destroy.\n");
1099                 RETURN(SVC_DROP);
1100         }
1101
1102         if (gc->gc_svc != PTLRPC_GSS_SVC_INTEGRITY) {
1103                 CERROR("service %d is not supported in destroy.\n",
1104                         gc->gc_svc);
1105                 GOTO(out, rc = SVC_DROP);
1106         }
1107
1108         *res = gss_svc_verify_request(req, rsci, gc, secdata, seclen);
1109         if (*res)
1110                 GOTO(out, rc = SVC_DROP);
1111
1112         /* compose reply, which is actually nothing */
1113         svcdata->is_fini = 1;
1114         if (lustre_pack_reply(req, 0, NULL, NULL))
1115                 GOTO(out, rc = SVC_DROP);
1116
1117         CWARN("svcsec destroy gss context %p(%u@%s)\n",
1118                rsci, rsci->cred.vc_uid,
1119                portals_nid2str(req->rq_peer.peer_ni->pni_number,
1120                                req->rq_peer.peer_id.nid, nidstr));
1121
1122         set_bit(CACHE_NEGATIVE, &rsci->h.flags);
1123         *res = PTLRPCS_OK;
1124         rc = SVC_LOGOUT;
1125 out:
1126         rsc_put(&rsci->h, &rsc_cache);
1127         RETURN(rc);
1128 }
1129
1130 /*
1131  * let incomming request go through security check:
1132  *  o context establishment: invoke user space helper
1133  *  o data exchange: verify/decrypt
1134  *  o context destruction: mark context invalid
1135  *
1136  * in most cases, error will result to drop the packet silently.
1137  */
1138 static int
1139 gss_svcsec_accept(struct ptlrpc_request *req, enum ptlrpcs_error *res)
1140 {
1141         struct gss_svc_data *svcdata;
1142         struct rpc_gss_wire_cred *gc;
1143         struct ptlrpcs_wire_hdr *sec_hdr;
1144         __u32 seclen, *secdata, version, subflavor;
1145         int rc;
1146         ENTRY;
1147
1148         CDEBUG(D_SEC, "request %p\n", req);
1149         LASSERT(req->rq_reqbuf);
1150         LASSERT(req->rq_reqbuf_len);
1151
1152         *res = PTLRPCS_BADCRED;
1153
1154         sec_hdr = buf_to_sec_hdr(req->rq_reqbuf);
1155         LASSERT(sec_hdr->flavor == PTLRPC_SEC_GSS);
1156
1157         seclen = req->rq_reqbuf_len - sizeof(*sec_hdr) - sec_hdr->msg_len;
1158         secdata = (__u32 *) buf_to_sec_data(req->rq_reqbuf);
1159
1160         if (sec_hdr->sec_len > seclen) {
1161                 CERROR("seclen %d, while max buf %d\n",
1162                         sec_hdr->sec_len, seclen);
1163                 RETURN(SVC_DROP);
1164         }
1165
1166         if (seclen < 6 * 4) {
1167                 CERROR("sec size %d too small\n", seclen);
1168                 RETURN(SVC_DROP);
1169         }
1170
1171         LASSERT(!req->rq_sec_svcdata);
1172         OBD_ALLOC(svcdata, sizeof(*svcdata));
1173         if (!svcdata) {
1174                 CERROR("fail to alloc svcdata\n");
1175                 RETURN(SVC_DROP);
1176         }
1177         req->rq_sec_svcdata = svcdata;
1178         gc = &svcdata->clcred;
1179
1180         /* Now secdata/seclen is what we want to parse
1181          */
1182         version = le32_to_cpu(*secdata++);      /* version */
1183         subflavor = le32_to_cpu(*secdata++);    /* subflavor */
1184         gc->gc_proc = le32_to_cpu(*secdata++);  /* proc */
1185         gc->gc_seq = le32_to_cpu(*secdata++);   /* seq */
1186         gc->gc_svc = le32_to_cpu(*secdata++);   /* service */
1187         seclen -= 5 * 4;
1188
1189         CDEBUG(D_SEC, "wire gss_hdr: %u/%u/%u/%u/%u\n",
1190                version, subflavor, gc->gc_proc, gc->gc_seq, gc->gc_svc);
1191
1192         if (version != PTLRPC_SEC_GSS_VERSION) {
1193                 CERROR("gss version mismatch: %d - %d\n",
1194                         version, PTLRPC_SEC_GSS_VERSION);
1195                 GOTO(err_free, rc = SVC_DROP);
1196         }
1197
1198         if (rawobj_extract(&gc->gc_ctx, &secdata, &seclen)) {
1199                 CERROR("fail to obtain gss context handle\n");
1200                 GOTO(err_free, rc = SVC_DROP);
1201         }
1202
1203         *res = PTLRPCS_BADVERF;
1204         switch(gc->gc_proc) {
1205         case RPC_GSS_PROC_INIT:
1206         case RPC_GSS_PROC_CONTINUE_INIT:
1207                 rc = gss_svcsec_handle_init(req, gc, secdata, seclen, res);
1208                 break;
1209         case RPC_GSS_PROC_DATA:
1210                 rc = gss_svcsec_handle_data(req, gc, secdata, seclen, res);
1211                 break;
1212         case RPC_GSS_PROC_DESTROY:
1213                 rc = gss_svcsec_handle_destroy(req, gc, secdata, seclen, res);
1214                 break;
1215         default:
1216                 rc = SVC_DROP;
1217                 LBUG();
1218         }
1219
1220 err_free:
1221         if (rc == SVC_DROP && req->rq_sec_svcdata) {
1222                 OBD_FREE(req->rq_sec_svcdata, sizeof(struct gss_svc_data));
1223                 req->rq_sec_svcdata = NULL;
1224         }
1225
1226         RETURN(rc);
1227 }
1228
1229 static int
1230 gss_svcsec_authorize(struct ptlrpc_request *req)
1231 {
1232         struct ptlrpc_reply_state *rs = req->rq_reply_state;
1233         struct gss_svc_data *gsd = (struct gss_svc_data *)req->rq_sec_svcdata;
1234         struct rpc_gss_wire_cred  *gc = &gsd->clcred;
1235         struct rsc                *rscp;
1236         struct ptlrpcs_wire_hdr   *sec_hdr;
1237         rawobj_buf_t               msg_buf;
1238         rawobj_t                   cipher_buf;
1239         __u32                     *vp, *vpsave, major, vlen, seclen;
1240         rawobj_t                   lmsg, mic;
1241         int                        ret;
1242         ENTRY;
1243
1244         LASSERT(rs);
1245         LASSERT(rs->rs_repbuf);
1246         LASSERT(gsd);
1247
1248         if (gsd->is_init || gsd->is_init_continue ||
1249             gsd->is_err_notify || gsd->is_fini) {
1250                 /* nothing to do in these cases */
1251                 CDEBUG(D_SEC, "req %p: init/fini/err\n", req);
1252                 RETURN(0);
1253         }
1254
1255         if (gc->gc_proc != RPC_GSS_PROC_DATA) {
1256                 CERROR("proc %d not support\n", gc->gc_proc);
1257                 RETURN(-EINVAL);
1258         }
1259
1260         rscp = gss_svc_searchbyctx(&gc->gc_ctx);
1261         if (!rscp) {
1262                 CERROR("ctx disapeared under us?\n");
1263                 RETURN(-EINVAL);
1264         }
1265
1266         sec_hdr = (struct ptlrpcs_wire_hdr *) rs->rs_repbuf;
1267         switch (gc->gc_svc) {
1268         case  PTLRPC_GSS_SVC_INTEGRITY:
1269                 /* prepare various pointers */
1270                 lmsg.len = req->rq_replen;
1271                 lmsg.data = (__u8 *) (rs->rs_repbuf + sizeof(*sec_hdr));
1272                 vp = (__u32 *) (lmsg.data + lmsg.len);
1273                 vlen = rs->rs_repbuf_len - sizeof(*sec_hdr) - lmsg.len;
1274                 seclen = vlen;
1275
1276                 sec_hdr->flavor = cpu_to_le32(PTLRPC_SEC_GSS);
1277                 sec_hdr->sectype = cpu_to_le32(PTLRPC_SEC_TYPE_AUTH);
1278                 sec_hdr->msg_len = cpu_to_le32(req->rq_replen);
1279
1280                 /* standard gss hdr */
1281                 LASSERT(vlen >= 7 * 4);
1282                 *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_VERSION);
1283                 *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_KRB5I);
1284                 *vp++ = cpu_to_le32(RPC_GSS_PROC_DATA);
1285                 *vp++ = cpu_to_le32(gc->gc_seq);
1286                 *vp++ = cpu_to_le32(PTLRPC_GSS_SVC_INTEGRITY);
1287                 *vp++ = 0;      /* fake ctx handle */
1288                 vpsave = vp++;  /* reserve size */
1289                 vlen -= 7 * 4;
1290
1291                 mic.len = vlen;
1292                 mic.data = (unsigned char *)vp;
1293
1294                 major = kgss_get_mic(rscp->mechctx, 0, &lmsg, &mic);
1295                 if (major) {
1296                         CERROR("fail to get MIC: 0x%x\n", major);
1297                         GOTO(out, ret = -EINVAL);
1298                 }
1299                 *vpsave = cpu_to_le32(mic.len);
1300                 seclen = seclen - vlen + mic.len;
1301                 sec_hdr->sec_len = cpu_to_le32(seclen);
1302                 rs->rs_repdata_len += size_round(seclen);
1303                 break;
1304         case  PTLRPC_GSS_SVC_PRIVACY:
1305                 vp = (__u32 *) (rs->rs_repbuf + sizeof(*sec_hdr));
1306                 vlen = rs->rs_repbuf_len - sizeof(*sec_hdr);
1307                 seclen = vlen;
1308
1309                 sec_hdr->flavor = cpu_to_le32(PTLRPC_SEC_GSS);
1310                 sec_hdr->sectype = cpu_to_le32(PTLRPC_SEC_TYPE_PRIV);
1311                 sec_hdr->msg_len = cpu_to_le32(0);
1312
1313                 /* standard gss hdr */
1314                 LASSERT(vlen >= 7 * 4);
1315                 *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_VERSION);
1316                 *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_KRB5I);
1317                 *vp++ = cpu_to_le32(RPC_GSS_PROC_DATA);
1318                 *vp++ = cpu_to_le32(gc->gc_seq);
1319                 *vp++ = cpu_to_le32(PTLRPC_GSS_SVC_PRIVACY);
1320                 *vp++ = 0;      /* fake ctx handle */
1321                 vpsave = vp++;  /* reserve size */
1322                 vlen -= 7 * 4;
1323
1324                 msg_buf.buf = (__u8 *) rs->rs_msg - GSS_PRIVBUF_PREFIX_LEN;
1325                 msg_buf.buflen = req->rq_replen + GSS_PRIVBUF_PREFIX_LEN +
1326                                  GSS_PRIVBUF_SUFFIX_LEN;
1327                 msg_buf.dataoff = GSS_PRIVBUF_PREFIX_LEN;
1328                 msg_buf.datalen = req->rq_replen;
1329
1330                 cipher_buf.data = (__u8 *) vp;
1331                 cipher_buf.len = vlen;
1332
1333                 major = kgss_wrap(rscp->mechctx, GSS_C_QOP_DEFAULT,
1334                                 &msg_buf, &cipher_buf);
1335                 if (major) {
1336                         CERROR("failed to wrap: 0x%x\n", major);
1337                         GOTO(out, ret = -EINVAL);
1338                 }
1339
1340                 *vpsave = cpu_to_le32(cipher_buf.len);
1341                 seclen = seclen - vlen + cipher_buf.len;
1342                 sec_hdr->sec_len = cpu_to_le32(seclen);
1343                 rs->rs_repdata_len += size_round(seclen);
1344                 break;
1345         default:
1346                 CERROR("Unknown service %d\n", gc->gc_svc);
1347                 GOTO(out, ret = -EINVAL);
1348         }
1349         ret = 0;
1350 out:
1351         rsc_put(&rscp->h, &rsc_cache);
1352
1353         RETURN(ret);
1354 }
1355
1356 static
1357 void gss_svcsec_cleanup_req(struct ptlrpc_svcsec *svcsec,
1358                             struct ptlrpc_request *req)
1359 {
1360         struct gss_svc_data *gsd = (struct gss_svc_data *) req->rq_sec_svcdata;
1361
1362         if (!gsd) {
1363                 CDEBUG(D_SEC, "no svc_data present. do nothing\n");
1364                 return;
1365         }
1366
1367         /* gsd->clclred.gc_ctx is NOT allocated, just set pointer
1368          * to the incoming packet buffer, so don't need free it
1369          */
1370         OBD_FREE(gsd, sizeof(*gsd));
1371         req->rq_sec_svcdata = NULL;
1372         return;
1373 }
1374
1375 static
1376 int gss_svcsec_est_payload(struct ptlrpc_svcsec *svcsec,
1377                            struct ptlrpc_request *req,
1378                            int msgsize)
1379 {
1380         struct gss_svc_data *svcdata = req->rq_sec_svcdata;
1381         ENTRY;
1382
1383         /* just return the pre-set reserve_len for init/fini/err cases.
1384          */
1385         LASSERT(svcdata);
1386         if (svcdata->is_init) {
1387                 CDEBUG(D_SEC, "is_init, reserver size %d(%d)\n",
1388                        size_round(svcdata->reserve_len),
1389                        svcdata->reserve_len);
1390                 LASSERT(svcdata->reserve_len);
1391                 LASSERT(svcdata->reserve_len % 4 == 0);
1392                 RETURN(size_round(svcdata->reserve_len));
1393         } else if (svcdata->is_err_notify) {
1394                 CDEBUG(D_SEC, "is_err_notify, reserver size %d(%d)\n",
1395                        size_round(svcdata->reserve_len),
1396                        svcdata->reserve_len);
1397                 RETURN(size_round(svcdata->reserve_len));
1398         } else if (svcdata->is_fini) {
1399                 CDEBUG(D_SEC, "is_fini, reserver size 0\n");
1400                 RETURN(0);
1401         } else {
1402                 if (svcdata->clcred.gc_svc == PTLRPC_GSS_SVC_NONE ||
1403                     svcdata->clcred.gc_svc == PTLRPC_GSS_SVC_INTEGRITY)
1404                         RETURN(size_round(GSS_MAX_AUTH_PAYLOAD));
1405                 else if (svcdata->clcred.gc_svc == PTLRPC_GSS_SVC_PRIVACY)
1406                         RETURN(size_round16(GSS_MAX_AUTH_PAYLOAD + msgsize +
1407                                             GSS_PRIVBUF_PREFIX_LEN +
1408                                             GSS_PRIVBUF_SUFFIX_LEN));
1409                 else {
1410                         CERROR("unknown gss svc %u\n", svcdata->clcred.gc_svc);
1411                         *((int *)0) = 0;
1412                         LBUG();
1413                 }
1414         }
1415         RETURN(0);
1416 }
1417
1418 int gss_svcsec_alloc_repbuf(struct ptlrpc_svcsec *svcsec,
1419                             struct ptlrpc_request *req,
1420                             int msgsize)
1421 {
1422         struct gss_svc_data *gsd = (struct gss_svc_data *) req->rq_sec_svcdata;
1423         struct ptlrpc_reply_state *rs;
1424         int msg_payload, sec_payload;
1425         int privacy, rc;
1426         ENTRY;
1427
1428         /* determine the security type: none/auth or priv, we have
1429          * different pack scheme for them.
1430          * init/fini/err will always be treated as none/auth.
1431          */
1432         LASSERT(gsd);
1433         if (!gsd->is_init && !gsd->is_init_continue &&
1434             !gsd->is_fini && !gsd->is_err_notify &&
1435             gsd->clcred.gc_svc == PTLRPC_GSS_SVC_PRIVACY)
1436                 privacy = 1;
1437         else
1438                 privacy = 0;
1439
1440         msg_payload = privacy ? 0 : msgsize;
1441         sec_payload = gss_svcsec_est_payload(svcsec, req, msgsize);
1442
1443         rc = svcsec_alloc_reply_state(req, msg_payload, sec_payload);
1444         if (rc)
1445                 RETURN(rc);
1446
1447         rs = req->rq_reply_state;
1448         LASSERT(rs);
1449         rs->rs_msg_len = msgsize;
1450
1451         if (privacy) {
1452                 /* we can choose to let msg simply point to the rear of the
1453                  * buffer, which lead to buffer overlap when doing encryption.
1454                  * usually it's ok and it indeed passed all existing tests.
1455                  * but not sure if there will be subtle problems in the future.
1456                  * so right now we choose to alloc another new buffer. we'll
1457                  * see how it works.
1458                  */
1459 #if 0
1460                 rs->rs_msg = (struct lustre_msg *)
1461                              (rs->rs_repbuf + rs->rs_repbuf_len -
1462                               msgsize - GSS_PRIVBUF_SUFFIX_LEN);
1463 #endif
1464                 char *msgbuf;
1465
1466                 msgsize += GSS_PRIVBUF_PREFIX_LEN + GSS_PRIVBUF_SUFFIX_LEN;
1467                 OBD_ALLOC(msgbuf, msgsize);
1468                 if (!msgbuf) {
1469                         CERROR("can't alloc %d\n", msgsize);
1470                         svcsec_free_reply_state(rs);
1471                         req->rq_reply_state = NULL;
1472                         RETURN(-ENOMEM);
1473                 }
1474                 rs->rs_msg = (struct lustre_msg *)
1475                                 (msgbuf + GSS_PRIVBUF_PREFIX_LEN);
1476         }
1477
1478         req->rq_repmsg = rs->rs_msg;
1479
1480         RETURN(0);
1481 }
1482
1483 static
1484 void gss_svcsec_free_repbuf(struct ptlrpc_svcsec *svcsec,
1485                             struct ptlrpc_reply_state *rs)
1486 {
1487         unsigned long p1 = (unsigned long) rs->rs_msg;
1488         unsigned long p2 = (unsigned long) rs->rs_buf;
1489
1490         LASSERT(rs->rs_buf);
1491         LASSERT(rs->rs_msg);
1492         LASSERT(rs->rs_msg_len);
1493
1494         if (p1 < p2 || p1 >= p2 + rs->rs_buf_len) {
1495                 char *start = (char*) rs->rs_msg - GSS_PRIVBUF_PREFIX_LEN;
1496                 int size = rs->rs_msg_len + GSS_PRIVBUF_PREFIX_LEN +
1497                            GSS_PRIVBUF_SUFFIX_LEN;
1498                 OBD_FREE(start, size);
1499         }
1500
1501         svcsec_free_reply_state(rs);
1502 }
1503
1504 struct ptlrpc_svcsec svcsec_gss = {
1505         .pss_owner              = THIS_MODULE,
1506         .pss_name               = "GSS_SVCSEC",
1507         .pss_flavor             = {PTLRPC_SEC_GSS, 0},
1508         .accept                 = gss_svcsec_accept,
1509         .authorize              = gss_svcsec_authorize,
1510         .alloc_repbuf           = gss_svcsec_alloc_repbuf,
1511         .free_repbuf            = gss_svcsec_free_repbuf,
1512         .cleanup_req            = gss_svcsec_cleanup_req,
1513 };
1514
1515 /* XXX hacking */
1516 void lgss_svc_cache_purge_all(void)
1517 {
1518         cache_purge(&rsi_cache);
1519         cache_purge(&rsc_cache);
1520 }
1521 EXPORT_SYMBOL(lgss_svc_cache_purge_all);
1522
1523 void lgss_svc_cache_flush(__u32 uid)
1524 {
1525         rsc_flush(uid);
1526 }
1527 EXPORT_SYMBOL(lgss_svc_cache_flush);
1528
1529 int gss_svc_init(void)
1530 {
1531         int rc;
1532
1533         rc = svcsec_register(&svcsec_gss);
1534         if (!rc) {
1535                 cache_register(&rsc_cache);
1536                 cache_register(&rsi_cache);
1537         }
1538         return rc;
1539 }
1540
1541 void gss_svc_exit(void)
1542 {
1543         int rc;
1544         if ((rc = cache_unregister(&rsi_cache)))
1545                 CERROR("unregister rsi cache: %d\n", rc);
1546         if ((rc = cache_unregister(&rsc_cache)))
1547                 CERROR("unregister rsc cache: %d\n", rc);
1548         if ((rc = svcsec_unregister(&svcsec_gss)))
1549                 CERROR("unregister svcsec_gss: %d\n", rc);
1550 }