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                   lustre_svc;
 109         __u32                   naltype;
 110         __u32                   netid;
 111         __u64                   nid;
 112         rawobj_t                in_handle, in_token, in_srv_type;
 113         rawobj_t                out_handle, out_token;
 114         int                     major_status, minor_status;
 115 };
 116
 117 static struct cache_head *rsi_table[RSI_HASHMAX];
 118 static struct cache_detail rsi_cache;
 119
 120 static void rsi_free(struct rsi *rsii)
 121 {
 122         rawobj_free(&rsii->in_handle);
 123         rawobj_free(&rsii->in_token);
 124         rawobj_free(&rsii->out_handle);
 125         rawobj_free(&rsii->out_token);
 126 }
 127
 128 static void rsi_put(struct cache_head *item, struct cache_detail *cd)
 129 {
 130         struct rsi *rsii = container_of(item, struct rsi, h);
 131         LASSERT(atomic_read(&item->refcnt) > 0);
 132         if (cache_put(item, cd)) {
 133                 LASSERT(item->next == NULL);
 134                 rsi_free(rsii);
 135                 OBD_FREE(rsii, sizeof(*rsii));
 136         }
 137 }
 138
 139 static inline int rsi_hash(struct rsi *item)
 140 {
 141         return hash_mem((char *)item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
 142                 ^ hash_mem((char *)item->in_token.data, item->in_token.len, RSI_HASHBITS);
 143 }
 144
 145 static inline int rsi_match(struct rsi *item, struct rsi *tmp)
 146 {
 147         return (rawobj_equal(&item->in_handle, &tmp->in_handle) &&
 148                 rawobj_equal(&item->in_token, &tmp->in_token));
 149 }
 150
 151 static void rsi_request(struct cache_detail *cd,
 152                         struct cache_head *h,
 153                         char **bpp, int *blen)
 154 {
 155         struct rsi *rsii = container_of(h, struct rsi, h);
 156
 157         qword_addhex(bpp, blen, (char *) &rsii->lustre_svc,
 158                      sizeof(rsii->lustre_svc));
 159         qword_addhex(bpp, blen, (char *) &rsii->naltype, sizeof(rsii->naltype));
 160         qword_addhex(bpp, blen, (char *) &rsii->netid, sizeof(rsii->netid));
 161         qword_addhex(bpp, blen, (char *) &rsii->nid, sizeof(rsii->nid));
 162         qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
 163         qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
 164         (*bpp)[-1] = '\n';
 165 }
 166
 167 static int
 168 gssd_reply(struct rsi *item)
 169 {
 170         struct rsi *tmp;
 171         struct cache_head **hp, **head;
 172         ENTRY;
 173
 174         head = &rsi_cache.hash_table[rsi_hash(item)];
 175         write_lock(&rsi_cache.hash_lock);
 176         for (hp = head; *hp != NULL; hp = &tmp->h.next) {
 177                 tmp = container_of(*hp, struct rsi, h);
 178                 if (rsi_match(tmp, item)) {
 179                         cache_get(&tmp->h);
 180                         clear_bit(CACHE_HASHED, &tmp->h.flags);
 181                         *hp = tmp->h.next;
 182                         tmp->h.next = NULL;
 183                         rsi_cache.entries--;
 184                         if (test_bit(CACHE_VALID, &tmp->h.flags)) {
 185                                 CERROR("rsi is valid\n");
 186                                 write_unlock(&rsi_cache.hash_lock);
 187                                 rsi_put(&tmp->h, &rsi_cache);
 188                                 RETURN(-EINVAL);
 189                         }
 190                         set_bit(CACHE_HASHED, &item->h.flags);
 191                         item->h.next = *hp;
 192                         *hp = &item->h;
 193                         rsi_cache.entries++;
 194                         set_bit(CACHE_VALID, &item->h.flags);
 195                         item->h.last_refresh = get_seconds();
 196                         write_unlock(&rsi_cache.hash_lock);
 197                         cache_fresh(&rsi_cache, &tmp->h, 0);
 198                         rsi_put(&tmp->h, &rsi_cache);
 199                         RETURN(0);
 200                 }
 201         }
 202         write_unlock(&rsi_cache.hash_lock);
 203         RETURN(-EINVAL);
 204 }
 205
 206 /* XXX
 207  * here we just wait here for its completion or timedout. it's a
 208  * hacking but works, and we'll comeup with real fix if we decided
 209  * to still stick with NFS4 cache code
 210  */
 211 static struct rsi *
 212 gssd_upcall(struct rsi *item, struct cache_req *chandle)
 213 {
 214         struct rsi *tmp;
 215         struct cache_head **hp, **head;
 216         unsigned long starttime;
 217         ENTRY;
 218
 219         head = &rsi_cache.hash_table[rsi_hash(item)];
 220         read_lock(&rsi_cache.hash_lock);
 221         for (hp = head; *hp != NULL; hp = &tmp->h.next) {
 222                 tmp = container_of(*hp, struct rsi, h);
 223                 if (rsi_match(tmp, item)) {
 224                         LBUG();
 225                         if (!test_bit(CACHE_VALID, &tmp->h.flags)) {
 226                                 CERROR("found rsi without VALID\n");
 227                                 read_unlock(&rsi_cache.hash_lock);
 228                                 return NULL;
 229                         }
 230                         *hp = tmp->h.next;
 231                         tmp->h.next = NULL;
 232                         rsi_cache.entries--;
 233                         cache_get(&tmp->h);
 234                         read_unlock(&rsi_cache.hash_lock);
 235                         return tmp;
 236                 }
 237         }
 238         cache_get(&item->h);
 239         //set_bit(CACHE_HASHED, &item->h.flags);
 240         item->h.next = *head;
 241         *head = &item->h;
 242         rsi_cache.entries++;
 243         read_unlock(&rsi_cache.hash_lock);
 244         //cache_get(&item->h);
 245
 246         cache_check(&rsi_cache, &item->h, chandle);
 247         starttime = get_seconds();
 248         do {
 249                 set_current_state(TASK_UNINTERRUPTIBLE);
 250                 schedule_timeout(HZ/2);
 251                 read_lock(&rsi_cache.hash_lock);
 252                 for (hp = head; *hp != NULL; hp = &tmp->h.next) {
 253                         tmp = container_of(*hp, struct rsi, h);
 254                         if (tmp == item)
 255                                 continue;
 256                         if (rsi_match(tmp, item)) {
 257                                 if (!test_bit(CACHE_VALID, &tmp->h.flags)) {
 258                                         read_unlock(&rsi_cache.hash_lock);
 259                                         return NULL;
 260                                 }
 261                                 cache_get(&tmp->h);
 262                                 clear_bit(CACHE_HASHED, &tmp->h.flags);
 263                                 *hp = tmp->h.next;
 264                                 tmp->h.next = NULL;
 265                                 rsi_cache.entries--;
 266                                 read_unlock(&rsi_cache.hash_lock);
 267                                 return tmp;
 268                         }
 269                 }
 270                 read_unlock(&rsi_cache.hash_lock);
 271         } while ((get_seconds() - starttime) <= 15);
 272         CERROR("15s timeout while waiting cache refill\n");
 273         return NULL;
 274 }
 275
 276 static int rsi_parse(struct cache_detail *cd,
 277                      char *mesg, int mlen)
 278 {
 279         /* context token expiry major minor context token */
 280         char *buf = mesg;
 281         char *ep;
 282         int len;
 283         struct rsi *rsii;
 284         time_t expiry;
 285         int status = -EINVAL;
 286         ENTRY;
 287
 288         OBD_ALLOC(rsii, sizeof(*rsii));
 289         if (!rsii)
 290                 RETURN(-ENOMEM);
 291         cache_init(&rsii->h);
 292
 293         /* handle */
 294         len = qword_get(&mesg, buf, mlen);
 295         if (len < 0)
 296                 goto out;
 297         if (rawobj_alloc(&rsii->in_handle, buf, len)) {
 298                 status = -ENOMEM;
 299                 goto out;
 300         }
 301
 302         /* token */
 303         len = qword_get(&mesg, buf, mlen);
 304         if (len < 0)
 305                 goto out;
 306         if (rawobj_alloc(&rsii->in_token, buf, len)) {
 307                 status = -ENOMEM;
 308                 goto out;
 309         }
 310
 311         /* expiry */
 312         expiry = get_expiry(&mesg);
 313         if (expiry == 0)
 314                 goto out;
 315
 316         /* major */
 317         len = qword_get(&mesg, buf, mlen);
 318         if (len <= 0)
 319                 goto out;
 320         rsii->major_status = simple_strtol(buf, &ep, 10);
 321         if (*ep)
 322                 goto out;
 323
 324         /* minor */
 325         len = qword_get(&mesg, buf, mlen);
 326         if (len <= 0)
 327                 goto out;
 328         rsii->minor_status = simple_strtol(buf, &ep, 10);
 329         if (*ep)
 330                 goto out;
 331
 332         /* out_handle */
 333         len = qword_get(&mesg, buf, mlen);
 334         if (len < 0)
 335                 goto out;
 336         if (rawobj_alloc(&rsii->out_handle, buf, len)) {
 337                 status = -ENOMEM;
 338                 goto out;
 339         }
 340
 341         /* out_token */
 342         len = qword_get(&mesg, buf, mlen);
 343         if (len < 0)
 344                 goto out;
 345         if (rawobj_alloc(&rsii->out_token, buf, len)) {
 346                 status = -ENOMEM;
 347                 goto out;
 348         }
 349
 350         rsii->h.expiry_time = expiry;
 351         status = gssd_reply(rsii);
 352 out:
 353         if (rsii)
 354                 rsi_put(&rsii->h, &rsi_cache);
 355         RETURN(status);
 356 }
 357
 358 static struct cache_detail rsi_cache = {
 359         .hash_size      = RSI_HASHMAX,
 360         .hash_table     = rsi_table,
 361         .name           = "auth.ptlrpcs.init",
 362         .cache_put      = rsi_put,
 363         .cache_request  = rsi_request,
 364         .cache_parse    = rsi_parse,
 365 };
 366
 367 /*
 368  * The rpcsec_context cache is used to store a context that is
 369  * used in data exchange.
 370  * The key is a context handle. The content is:
 371  *  uid, gidlist, mechanism, service-set, mech-specific-data
 372  */
 373
 374 #define RSC_HASHBITS    10
 375 #define RSC_HASHMAX     (1<<RSC_HASHBITS)
 376 #define RSC_HASHMASK    (RSC_HASHMAX-1)
 377
 378 #define GSS_SEQ_WIN     512
 379
 380 struct gss_svc_seq_data {
 381         /* highest seq number seen so far: */
 382         __u32                   sd_max;
 383         /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
 384          * sd_win is nonzero iff sequence number i has been seen already: */
 385         unsigned long           sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
 386         spinlock_t              sd_lock;
 387 };
 388
 389 struct rsc {
 390         struct cache_head       h;
 391         rawobj_t                handle;
 392         __u32                   remote_realm;
 393         struct vfs_cred         cred;
 394         uid_t                   mapped_uid;
 395         struct gss_svc_seq_data seqdata;
 396         struct gss_ctx         *mechctx;
 397 };
 398
 399 static struct cache_head *rsc_table[RSC_HASHMAX];
 400 static struct cache_detail rsc_cache;
 401
 402 static void rsc_free(struct rsc *rsci)
 403 {
 404         rawobj_free(&rsci->handle);
 405         if (rsci->mechctx)
 406                 kgss_delete_sec_context(&rsci->mechctx);
 407 #if 0
 408         if (rsci->cred.vc_ginfo)
 409                 put_group_info(rsci->cred.vc_ginfo);
 410 #endif
 411 }
 412
 413 static void rsc_put(struct cache_head *item, struct cache_detail *cd)
 414 {
 415         struct rsc *rsci = container_of(item, struct rsc, h);
 416
 417         LASSERT(atomic_read(&item->refcnt) > 0);
 418         if (cache_put(item, cd)) {
 419                 LASSERT(item->next == NULL);
 420                 rsc_free(rsci);
 421                 OBD_FREE(rsci, sizeof(*rsci));
 422         }
 423 }
 424
 425 static inline int
 426 rsc_hash(struct rsc *rsci)
 427 {
 428         return hash_mem((char *)rsci->handle.data,
 429                         rsci->handle.len, RSC_HASHBITS);
 430 }
 431
 432 static inline int
 433 rsc_match(struct rsc *new, struct rsc *tmp)
 434 {
 435         return rawobj_equal(&new->handle, &tmp->handle);
 436 }
 437
 438 static struct rsc *rsc_lookup(struct rsc *item, int set)
 439 {
 440         struct rsc *tmp = NULL;
 441         struct cache_head **hp, **head;
 442         head = &rsc_cache.hash_table[rsc_hash(item)];
 443         ENTRY;
 444
 445         if (set)
 446                 write_lock(&rsc_cache.hash_lock);
 447         else
 448                 read_lock(&rsc_cache.hash_lock);
 449         for (hp = head; *hp != NULL; hp = &tmp->h.next) {
 450                 tmp = container_of(*hp, struct rsc, h);
 451                 if (!rsc_match(tmp, item))
 452                         continue;
 453                 cache_get(&tmp->h);
 454                 if (!set)
 455                         goto out_noset;
 456                 *hp = tmp->h.next;
 457                 tmp->h.next = NULL;
 458                 clear_bit(CACHE_HASHED, &tmp->h.flags);
 459                 rsc_put(&tmp->h, &rsc_cache);
 460                 goto out_set;
 461         }
 462         /* Didn't find anything */
 463         if (!set)
 464                 goto out_nada;
 465         rsc_cache.entries++;
 466 out_set:
 467         set_bit(CACHE_HASHED, &item->h.flags);
 468         item->h.next = *head;
 469         *head = &item->h;
 470         write_unlock(&rsc_cache.hash_lock);
 471         cache_fresh(&rsc_cache, &item->h, item->h.expiry_time);
 472         cache_get(&item->h);
 473         RETURN(item);
 474 out_nada:
 475         tmp = NULL;
 476 out_noset:
 477         read_unlock(&rsc_cache.hash_lock);
 478         RETURN(tmp);
 479 }
 480
 481 static int rsc_parse(struct cache_detail *cd,
 482                      char *mesg, int mlen)
 483 {
 484         /* contexthandle expiry [ uid gid N <n gids> mechname
 485          * ...mechdata... ] */
 486         char *buf = mesg;
 487         int len, rv;
 488         struct rsc *rsci, *res = NULL;
 489         time_t expiry;
 490         int status = -EINVAL;
 491
 492         OBD_ALLOC(rsci, sizeof(*rsci));
 493         if (!rsci) {
 494                 CERROR("fail to alloc rsci\n");
 495                 return -ENOMEM;
 496         }
 497         cache_init(&rsci->h);
 498
 499         /* context handle */
 500         len = qword_get(&mesg, buf, mlen);
 501         if (len < 0) goto out;
 502         status = -ENOMEM;
 503         if (rawobj_alloc(&rsci->handle, buf, len))
 504                 goto out;
 505
 506         /* expiry */
 507         expiry = get_expiry(&mesg);
 508         status = -EINVAL;
 509         if (expiry == 0)
 510                 goto out;
 511
 512         /* remote flag */
 513         rv = get_int(&mesg, (int *)&rsci->remote_realm);
 514         if (rv) {
 515                 CERROR("fail to get remote flag\n");
 516                 goto out;
 517         }
 518
 519         /* mapped uid */
 520         rv = get_int(&mesg, (int *)&rsci->mapped_uid);
 521         if (rv) {
 522                 CERROR("fail to get mapped uid\n");
 523                 goto out;
 524         }
 525
 526         /* uid, or NEGATIVE */
 527         rv = get_int(&mesg, (int *)&rsci->cred.vc_uid);
 528         if (rv == -EINVAL)
 529                 goto out;
 530         if (rv == -ENOENT) {
 531                 CERROR("NOENT? set rsc entry negative\n");
 532                 set_bit(CACHE_NEGATIVE, &rsci->h.flags);
 533         } else {
 534                 struct gss_api_mech *gm;
 535                 rawobj_t tmp_buf;
 536                 __u64 ctx_expiry;
 537
 538                 /* gid */
 539                 if (get_int(&mesg, (int *)&rsci->cred.vc_gid))
 540                         goto out;
 541
 542                 /* mech name */
 543                 len = qword_get(&mesg, buf, mlen);
 544                 if (len < 0)
 545                         goto out;
 546                 gm = kgss_name_to_mech(buf);
 547                 status = -EOPNOTSUPP;
 548                 if (!gm)
 549                         goto out;
 550
 551                 status = -EINVAL;
 552                 /* mech-specific data: */
 553                 len = qword_get(&mesg, buf, mlen);
 554                 if (len < 0) {
 555                         kgss_mech_put(gm);
 556                         goto out;
 557                 }
 558                 tmp_buf.len = len;
 559                 tmp_buf.data = (unsigned char *)buf;
 560                 if (kgss_import_sec_context(&tmp_buf, gm, &rsci->mechctx)) {
 561                         kgss_mech_put(gm);
 562                         goto out;
 563                 }
 564
 565                 /* currently the expiry time passed down from user-space
 566                  * is invalid, here we retrive it from mech.
 567                  */
 568                 if (kgss_inquire_context(rsci->mechctx, &ctx_expiry)) {
 569                         CERROR("unable to get expire time, drop it\n");
 570                         set_bit(CACHE_NEGATIVE, &rsci->h.flags);
 571                         kgss_mech_put(gm);
 572                         goto out;
 573                 }
 574                 expiry = (time_t) ctx_expiry;
 575
 576                 kgss_mech_put(gm);
 577         }
 578         rsci->h.expiry_time = expiry;
 579         spin_lock_init(&rsci->seqdata.sd_lock);
 580         res = rsc_lookup(rsci, 1);
 581         rsc_put(&res->h, &rsc_cache);
 582         status = 0;
 583 out:
 584         if (rsci)
 585                 rsc_put(&rsci->h, &rsc_cache);
 586         return status;
 587 }
 588
 589 /*
 590  * flush all entries with @uid. @uid == -1 will match all.
 591  * we only know the uid, maybe netid/nid in the future, in all cases
 592  * we must search the whole cache
 593  */
 594 static void rsc_flush(uid_t uid)
 595 {
 596         struct cache_head **ch;
 597         struct rsc *rscp;
 598         int n;
 599         ENTRY;
 600
 601         write_lock(&rsc_cache.hash_lock);
 602         for (n = 0; n < RSC_HASHMAX; n++) {
 603                 for (ch = &rsc_cache.hash_table[n]; *ch;) {
 604                         rscp = container_of(*ch, struct rsc, h);
 605                         if (uid == -1 || rscp->cred.vc_uid == uid) {
 606                                 /* it seems simply set NEGATIVE doesn't work */
 607                                 *ch = (*ch)->next;
 608                                 rscp->h.next = NULL;
 609                                 cache_get(&rscp->h);
 610                                 set_bit(CACHE_NEGATIVE, &rscp->h.flags);
 611                                 clear_bit(CACHE_HASHED, &rscp->h.flags);
 612                                 CDEBUG(D_SEC, "flush rsc %p for uid %u\n",
 613                                        rscp, rscp->cred.vc_uid);
 614                                 rsc_put(&rscp->h, &rsc_cache);
 615                                 rsc_cache.entries--;
 616                                 continue;
 617                         }
 618                         ch = &((*ch)->next);
 619                 }
 620         }
 621         write_unlock(&rsc_cache.hash_lock);
 622         EXIT;
 623 }
 624
 625 static struct cache_detail rsc_cache = {
 626         .hash_size      = RSC_HASHMAX,
 627         .hash_table     = rsc_table,
 628         .name           = "auth.ptlrpcs.context",
 629         .cache_put      = rsc_put,
 630         .cache_parse    = rsc_parse,
 631 };
 632
 633 static struct rsc *
 634 gss_svc_searchbyctx(rawobj_t *handle)
 635 {
 636         struct rsc rsci;
 637         struct rsc *found;
 638
 639         rsci.handle = *handle;
 640         found = rsc_lookup(&rsci, 0);
 641         if (!found)
 642                 return NULL;
 643
 644         if (cache_check(&rsc_cache, &found->h, NULL))
 645                 return NULL;
 646
 647         return found;
 648 }
 649
 650 /* FIXME
 651  * again hacking: only try to give the svcgssd a chance to handle
 652  * upcalls.
 653  */
 654 struct cache_deferred_req* my_defer(struct cache_req *req)
 655 {
 656         yield();
 657         return NULL;
 658 }
 659 static struct cache_req my_chandle = {my_defer};
 660
 661 /* Implements sequence number algorithm as specified in RFC 2203. */
 662 static int
 663 gss_check_seq_num(struct gss_svc_seq_data *sd, __u32 seq_num)
 664 {
 665         int rc = 0;
 666
 667         spin_lock(&sd->sd_lock);
 668         if (seq_num > sd->sd_max) {
 669                 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
 670                         memset(sd->sd_win, 0, sizeof(sd->sd_win));
 671                         sd->sd_max = seq_num;
 672                 } else {
 673                         while(sd->sd_max < seq_num) {
 674                                 sd->sd_max++;
 675                                 __clear_bit(sd->sd_max % GSS_SEQ_WIN,
 676                                             sd->sd_win);
 677                         }
 678                 }
 679                 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
 680                 goto exit;
 681         } else if (seq_num + GSS_SEQ_WIN <= sd->sd_max) {
 682                 CERROR("seq %u too low: max %u, win %d\n",
 683                         seq_num, sd->sd_max, GSS_SEQ_WIN);
 684                 rc = 1;
 685                 goto exit;
 686         }
 687
 688         if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) {
 689                 CERROR("seq %u is replay: max %u, win %d\n",
 690                         seq_num, sd->sd_max, GSS_SEQ_WIN);
 691                 rc = 1;
 692         }
 693 exit:
 694         spin_unlock(&sd->sd_lock);
 695         return rc;
 696 }
 697
 698 static int
 699 gss_svc_verify_request(struct ptlrpc_request *req,
 700                        struct rsc *rsci,
 701                        struct rpc_gss_wire_cred *gc,
 702                        __u32 *vp, __u32 vlen)
 703 {
 704         struct ptlrpcs_wire_hdr *sec_hdr;
 705         struct gss_ctx *ctx = rsci->mechctx;
 706         __u32 maj_stat;
 707         rawobj_t msg;
 708         rawobj_t mic;
 709         ENTRY;
 710
 711         sec_hdr = (struct ptlrpcs_wire_hdr *) req->rq_reqbuf;
 712
 713         req->rq_reqmsg = (struct lustre_msg *) (req->rq_reqbuf + sizeof(*sec_hdr));
 714         req->rq_reqlen = sec_hdr->msg_len;
 715
 716         msg.len = sec_hdr->msg_len;
 717         msg.data = (__u8 *)req->rq_reqmsg;
 718
 719         mic.len = le32_to_cpu(*vp++);
 720         mic.data = (unsigned char *)vp;
 721         vlen -= 4;
 722
 723         if (mic.len > vlen) {
 724                 CERROR("checksum len %d, while buffer len %d\n",
 725                         mic.len, vlen);
 726                 RETURN(GSS_S_CALL_BAD_STRUCTURE);
 727         }
 728
 729         if (mic.len > 256) {
 730                 CERROR("invalid mic len %d\n", mic.len);
 731                 RETURN(GSS_S_CALL_BAD_STRUCTURE);
 732         }
 733
 734         maj_stat = kgss_verify_mic(ctx, &msg, &mic, NULL);
 735         if (maj_stat != GSS_S_COMPLETE) {
 736                 CERROR("MIC verification error: major %x\n", maj_stat);
 737                 RETURN(maj_stat);
 738         }
 739
 740         if (gss_check_seq_num(&rsci->seqdata, gc->gc_seq)) {
 741                 CERROR("discard replayed request %p(o%u,x"LPU64",t"LPU64")\n",
 742                         req, req->rq_reqmsg->opc, req->rq_xid,
 743                         req->rq_reqmsg->transno);
 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 replayed request %p(o%u,x"LPU64",t"LPU64")\n",
 789                         req, req->rq_reqmsg->opc, req->rq_xid,
 790                         req->rq_reqmsg->transno);
 791                 RETURN(GSS_S_DUPLICATE_TOKEN);
 792         }
 793
 794         req->rq_reqmsg = (struct lustre_msg *) (vp);
 795         req->rq_reqlen = plain_text.len;
 796
 797         CDEBUG(D_SEC, "msg len %d\n", req->rq_reqlen);
 798
 799         RETURN(GSS_S_COMPLETE);
 800 }
 801
 802 static int
 803 gss_pack_err_notify(struct ptlrpc_request *req,
 804                     __u32 major, __u32 minor)
 805 {
 806         struct gss_svc_data *svcdata = req->rq_sec_svcdata;
 807         __u32 reslen, *resp, *reslenp;
 808         char  nidstr[PTL_NALFMT_SIZE];
 809         const __u32 secdata_len = 7 * 4;
 810         int rc;
 811         ENTRY;
 812
 813         OBD_FAIL_RETURN(OBD_FAIL_SVCGSS_ERR_NOTIFY|OBD_FAIL_ONCE, -EINVAL);
 814
 815         LASSERT(svcdata);
 816         svcdata->is_err_notify = 1;
 817         svcdata->reserve_len = 7 * 4;
 818
 819         rc = lustre_pack_reply(req, 0, NULL, NULL);
 820         if (rc) {
 821                 CERROR("could not pack reply, err %d\n", rc);
 822                 RETURN(rc);
 823         }
 824
 825         LASSERT(req->rq_reply_state);
 826         LASSERT(req->rq_reply_state->rs_repbuf);
 827         LASSERT(req->rq_reply_state->rs_repbuf_len >= secdata_len);
 828         resp = (__u32 *) req->rq_reply_state->rs_repbuf;
 829
 830         /* header */
 831         *resp++ = cpu_to_le32(PTLRPC_SEC_GSS);
 832         *resp++ = cpu_to_le32(PTLRPC_SEC_TYPE_NONE);
 833         *resp++ = cpu_to_le32(req->rq_replen);
 834         reslenp = resp++;
 835
 836         /* skip lustre msg */
 837         resp += req->rq_replen / 4;
 838         reslen = svcdata->reserve_len;
 839
 840         /* gss replay:
 841          * version, subflavor, notify, major, minor,
 842          * obj1(fake), obj2(fake)
 843          */
 844         *resp++ = cpu_to_le32(PTLRPC_SEC_GSS_VERSION);
 845         *resp++ = cpu_to_le32(PTLRPC_SEC_GSS_KRB5I);
 846         *resp++ = cpu_to_le32(PTLRPC_GSS_PROC_ERR);
 847         *resp++ = cpu_to_le32(major);
 848         *resp++ = cpu_to_le32(minor);
 849         *resp++ = 0;
 850         *resp++ = 0;
 851         reslen -= (4 * 4);
 852         /* the actual sec data length */
 853         *reslenp = cpu_to_le32(secdata_len);
 854
 855         req->rq_reply_state->rs_repdata_len += (secdata_len);
 856         CDEBUG(D_SEC, "prepare gss error notify(0x%x/0x%x) to %s\n",
 857                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 void dump_cache_head(struct cache_head *h)
 864 {
 865         CWARN("ref %d, fl %lx, n %p, t %ld, %ld\n",
 866               atomic_read(&h->refcnt), h->flags, h->next,
 867               h->expiry_time, h->last_refresh);
 868 }
 869 static void dump_rsi(struct rsi *rsi)
 870 {
 871         CWARN("dump rsi %p\n", rsi);
 872         dump_cache_head(&rsi->h);
 873         CWARN("%x,%x,%llx\n", rsi->naltype, rsi->netid, rsi->nid);
 874         CWARN("len %d, d %p\n", rsi->in_handle.len, rsi->in_handle.data);
 875         CWARN("len %d, d %p\n", rsi->in_token.len, rsi->in_token.data);
 876         CWARN("len %d, d %p\n", rsi->out_handle.len, rsi->out_handle.data);
 877         CWARN("len %d, d %p\n", rsi->out_token.len, rsi->out_token.data);
 878 }
 879
 880 static int
 881 gss_svcsec_handle_init(struct ptlrpc_request *req,
 882                        struct rpc_gss_wire_cred *gc,
 883                        __u32 *secdata, __u32 seclen,
 884                        enum ptlrpcs_error *res)
 885 {
 886         struct gss_svc_data *svcdata = req->rq_sec_svcdata;
 887         struct rsc          *rsci;
 888         struct rsi          *rsikey, *rsip;
 889         rawobj_t             tmpobj;
 890         __u32 reslen,       *resp, *reslenp;
 891         char                 nidstr[PTL_NALFMT_SIZE];
 892         int                  rc;
 893         ENTRY;
 894
 895         LASSERT(svcdata);
 896
 897         CDEBUG(D_SEC, "processing gss init(%d) request from %s\n", gc->gc_proc,
 898                portals_nid2str(req->rq_peer.peer_ni->pni_number,
 899                                req->rq_peer.peer_id.nid, nidstr));
 900
 901         *res = PTLRPCS_BADCRED;
 902         OBD_FAIL_RETURN(OBD_FAIL_SVCGSS_INIT_REQ|OBD_FAIL_ONCE, SVC_DROP);
 903
 904         if (gc->gc_proc == RPC_GSS_PROC_INIT &&
 905             gc->gc_ctx.len != 0) {
 906                 CERROR("proc %d, ctx_len %d: not really init?\n",
 907                 gc->gc_proc == RPC_GSS_PROC_INIT, gc->gc_ctx.len);
 908                 RETURN(SVC_DROP);
 909         }
 910
 911         OBD_ALLOC(rsikey, sizeof(*rsikey));
 912         if (!rsikey) {
 913                 CERROR("out of memory\n");
 914                 RETURN(SVC_DROP);
 915         }
 916         cache_init(&rsikey->h);
 917
 918         /* obtain lustre svc type */
 919         if (seclen < 4) {
 920                 CERROR("sec size %d too small\n", seclen);
 921                 GOTO(out_rsikey, rc = SVC_DROP);
 922         }
 923         rsikey->lustre_svc = le32_to_cpu(*secdata++);
 924         seclen -= 4;
 925
 926         /* duplicate context handle. currently always 0 */
 927         if (rawobj_dup(&rsikey->in_handle, &gc->gc_ctx)) {
 928                 CERROR("fail to dup context handle\n");
 929                 GOTO(out_rsikey, rc = SVC_DROP);
 930         }
 931
 932         /* extract token */
 933         *res = PTLRPCS_BADVERF;
 934         if (rawobj_extract(&tmpobj, &secdata, &seclen)) {
 935                 CERROR("can't extract token\n");
 936                 GOTO(out_rsikey, rc = SVC_DROP);
 937         }
 938         if (rawobj_dup(&rsikey->in_token, &tmpobj)) {
 939                 CERROR("can't duplicate token\n");
 940                 GOTO(out_rsikey, rc = SVC_DROP);
 941         }
 942
 943         rsikey->naltype = (__u32) req->rq_peer.peer_ni->pni_number;
 944         rsikey->netid = 0;
 945         rsikey->nid = (__u64) req->rq_peer.peer_id.nid;
 946
 947         rsip = gssd_upcall(rsikey, &my_chandle);
 948         if (!rsip) {
 949                 CERROR("error in gssd_upcall.\n");
 950
 951                 rc = SVC_COMPLETE;
 952                 if (gss_pack_err_notify(req, GSS_S_FAILURE, 0))
 953                         rc = SVC_DROP;
 954
 955                 GOTO(out_rsikey, rc);
 956         }
 957
 958         rsci = gss_svc_searchbyctx(&rsip->out_handle);
 959         if (!rsci) {
 960                 CERROR("rsci still not mature yet?\n");
 961
 962                 rc = SVC_COMPLETE;
 963                 if (gss_pack_err_notify(req, GSS_S_FAILURE, 0))
 964                         rc = SVC_DROP;
 965
 966                 GOTO(out_rsip, rc);
 967         }
 968         CDEBUG(D_SEC, "svcsec create gss context %p(%u@%s)\n",
 969                rsci, rsci->cred.vc_uid,
 970                portals_nid2str(req->rq_peer.peer_ni->pni_number,
 971                                req->rq_peer.peer_id.nid, nidstr));
 972
 973         svcdata->is_init = 1;
 974         svcdata->reserve_len = 6 * 4 +
 975                 size_round4(rsip->out_handle.len) +
 976                 size_round4(rsip->out_token.len);
 977
 978         rc = lustre_pack_reply(req, 0, NULL, NULL);
 979         if (rc) {
 980                 CERROR("failed to pack reply, rc = %d\n", rc);
 981                 set_bit(CACHE_NEGATIVE, &rsci->h.flags);
 982                 GOTO(out, rc = SVC_DROP);
 983         }
 984
 985         /* header */
 986         resp = (__u32 *) req->rq_reply_state->rs_repbuf;
 987         *resp++ = cpu_to_le32(PTLRPC_SEC_GSS);
 988         *resp++ = cpu_to_le32(PTLRPC_SEC_TYPE_NONE);
 989         *resp++ = cpu_to_le32(req->rq_replen);
 990         reslenp = resp++;
 991
 992         resp += req->rq_replen / 4;
 993         reslen = svcdata->reserve_len;
 994
 995         /* gss reply:
 996          * status, major, minor, seq, out_handle, out_token
 997          */
 998         *resp++ = cpu_to_le32(PTLRPCS_OK);
 999         *resp++ = cpu_to_le32(rsip->major_status);
1000         *resp++ = cpu_to_le32(rsip->minor_status);
1001         *resp++ = cpu_to_le32(GSS_SEQ_WIN);
1002         reslen -= (4 * 4);
1003         if (rawobj_serialize(&rsip->out_handle,
1004                              &resp, &reslen)) {
1005                 dump_rsi(rsip);
1006                 dump_rsi(rsikey);
1007                 LBUG();
1008         }
1009         if (rawobj_serialize(&rsip->out_token,
1010                              &resp, &reslen)) {
1011                 dump_rsi(rsip);
1012                 dump_rsi(rsikey);
1013                 LBUG();
1014         }
1015         /* the actual sec data length */
1016         *reslenp = cpu_to_le32(svcdata->reserve_len - reslen);
1017
1018         req->rq_reply_state->rs_repdata_len += le32_to_cpu(*reslenp);
1019         CDEBUG(D_SEC, "req %p: msgsize %d, authsize %d, "
1020                "total size %d\n", req, req->rq_replen,
1021                le32_to_cpu(*reslenp),
1022                req->rq_reply_state->rs_repdata_len);
1023
1024         *res = PTLRPCS_OK;
1025
1026         req->rq_auth_uid = rsci->cred.vc_uid;
1027         req->rq_remote_realm = rsci->remote_realm;
1028         req->rq_mapped_uid = rsci->mapped_uid;
1029
1030         /* This is simplified since right now we doesn't support
1031          * INIT_CONTINUE yet.
1032          */
1033         if (gc->gc_proc == RPC_GSS_PROC_INIT) {
1034                 struct ptlrpcs_wire_hdr *hdr;
1035
1036                 hdr = buf_to_sec_hdr(req->rq_reqbuf);
1037                 req->rq_reqmsg = buf_to_lustre_msg(req->rq_reqbuf);
1038                 req->rq_reqlen = hdr->msg_len;
1039
1040                 rc = SVC_LOGIN;
1041         } else
1042                 rc = SVC_COMPLETE;
1043
1044 out:
1045         rsc_put(&rsci->h, &rsc_cache);
1046 out_rsip:
1047         rsi_put(&rsip->h, &rsi_cache);
1048 out_rsikey:
1049         rsi_put(&rsikey->h, &rsi_cache);
1050
1051         RETURN(rc);
1052 }
1053
1054 static int
1055 gss_svcsec_handle_data(struct ptlrpc_request *req,
1056                        struct rpc_gss_wire_cred *gc,
1057                        __u32 *secdata, __u32 seclen,
1058                        enum ptlrpcs_error *res)
1059 {
1060         struct rsc          *rsci;
1061         char                 nidstr[PTL_NALFMT_SIZE];
1062         __u32                major;
1063         int                  rc;
1064         ENTRY;
1065
1066         *res = PTLRPCS_GSS_CREDPROBLEM;
1067
1068         rsci = gss_svc_searchbyctx(&gc->gc_ctx);
1069         if (!rsci) {
1070                 CWARN("Invalid gss context handle from %s\n",
1071                        portals_nid2str(req->rq_peer.peer_ni->pni_number,
1072                                        req->rq_peer.peer_id.nid, nidstr));
1073                 major = GSS_S_NO_CONTEXT;
1074                 goto notify_err;
1075         }
1076
1077         switch (gc->gc_svc) {
1078         case PTLRPC_GSS_SVC_INTEGRITY:
1079                 major = gss_svc_verify_request(req, rsci, gc, secdata, seclen);
1080                 if (major == GSS_S_COMPLETE)
1081                         break;
1082
1083                 CWARN("fail in verify:0x%x: ctx %p@%s\n", major, rsci,
1084                        portals_nid2str(req->rq_peer.peer_ni->pni_number,
1085                                        req->rq_peer.peer_id.nid, nidstr));
1086                 goto notify_err;
1087         case PTLRPC_GSS_SVC_PRIVACY:
1088                 major = gss_svc_unseal_request(req, rsci, gc, secdata, seclen);
1089                 if (major == GSS_S_COMPLETE)
1090                         break;
1091
1092                 CWARN("fail in decrypt:0x%x: ctx %p@%s\n", major, rsci,
1093                        portals_nid2str(req->rq_peer.peer_ni->pni_number,
1094                                        req->rq_peer.peer_id.nid, nidstr));
1095                 goto notify_err;
1096         default:
1097                 CERROR("unsupported gss service %d\n", gc->gc_svc);
1098                 GOTO(out, rc = SVC_DROP);
1099         }
1100
1101         req->rq_auth_uid = rsci->cred.vc_uid;
1102         req->rq_remote_realm = rsci->remote_realm;
1103         req->rq_mapped_uid = rsci->mapped_uid;
1104
1105         *res = PTLRPCS_OK;
1106         GOTO(out, rc = SVC_OK);
1107
1108 notify_err:
1109         if (gss_pack_err_notify(req, major, 0))
1110                 rc = SVC_DROP;
1111         else
1112                 rc = SVC_COMPLETE;
1113 out:
1114         if (rsci)
1115                 rsc_put(&rsci->h, &rsc_cache);
1116         RETURN(rc);
1117 }
1118
1119 static int
1120 gss_svcsec_handle_destroy(struct ptlrpc_request *req,
1121                           struct rpc_gss_wire_cred *gc,
1122                           __u32 *secdata, __u32 seclen,
1123                           enum ptlrpcs_error *res)
1124 {
1125         struct gss_svc_data *svcdata = req->rq_sec_svcdata;
1126         struct rsc          *rsci;
1127         char                 nidstr[PTL_NALFMT_SIZE];
1128         int                  rc;
1129         ENTRY;
1130
1131         LASSERT(svcdata);
1132         *res = PTLRPCS_GSS_CREDPROBLEM;
1133
1134         rsci = gss_svc_searchbyctx(&gc->gc_ctx);
1135         if (!rsci) {
1136                 CWARN("invalid gss context handle for destroy.\n");
1137                 RETURN(SVC_DROP);
1138         }
1139
1140         if (gc->gc_svc != PTLRPC_GSS_SVC_INTEGRITY) {
1141                 CERROR("service %d is not supported in destroy.\n",
1142                         gc->gc_svc);
1143                 GOTO(out, rc = SVC_DROP);
1144         }
1145
1146         *res = gss_svc_verify_request(req, rsci, gc, secdata, seclen);
1147         if (*res)
1148                 GOTO(out, rc = SVC_DROP);
1149
1150         /* compose reply, which is actually nothing */
1151         svcdata->is_fini = 1;
1152         if (lustre_pack_reply(req, 0, NULL, NULL))
1153                 GOTO(out, rc = SVC_DROP);
1154
1155         CDEBUG(D_SEC, "svcsec destroy gss context %p(%u@%s)\n",
1156                rsci, rsci->cred.vc_uid,
1157                portals_nid2str(req->rq_peer.peer_ni->pni_number,
1158                                req->rq_peer.peer_id.nid, nidstr));
1159
1160         set_bit(CACHE_NEGATIVE, &rsci->h.flags);
1161         *res = PTLRPCS_OK;
1162         rc = SVC_LOGOUT;
1163 out:
1164         rsc_put(&rsci->h, &rsc_cache);
1165         RETURN(rc);
1166 }
1167
1168 /*
1169  * let incomming request go through security check:
1170  *  o context establishment: invoke user space helper
1171  *  o data exchange: verify/decrypt
1172  *  o context destruction: mark context invalid
1173  *
1174  * in most cases, error will result to drop the packet silently.
1175  */
1176 static int
1177 gss_svcsec_accept(struct ptlrpc_request *req, enum ptlrpcs_error *res)
1178 {
1179         struct gss_svc_data *svcdata;
1180         struct rpc_gss_wire_cred *gc;
1181         struct ptlrpcs_wire_hdr *sec_hdr;
1182         __u32 seclen, *secdata, version;
1183         int rc;
1184         ENTRY;
1185
1186         CDEBUG(D_SEC, "request %p\n", req);
1187         LASSERT(req->rq_reqbuf);
1188         LASSERT(req->rq_reqbuf_len);
1189
1190         *res = PTLRPCS_BADCRED;
1191
1192         sec_hdr = buf_to_sec_hdr(req->rq_reqbuf);
1193         LASSERT(sec_hdr->flavor == PTLRPC_SEC_GSS);
1194
1195         seclen = req->rq_reqbuf_len - sizeof(*sec_hdr) - sec_hdr->msg_len;
1196         secdata = (__u32 *) buf_to_sec_data(req->rq_reqbuf);
1197
1198         if (sec_hdr->sec_len > seclen) {
1199                 CERROR("seclen %d, while max buf %d\n",
1200                         sec_hdr->sec_len, seclen);
1201                 RETURN(SVC_DROP);
1202         }
1203
1204         if (seclen < 6 * 4) {
1205                 CERROR("sec size %d too small\n", seclen);
1206                 RETURN(SVC_DROP);
1207         }
1208
1209         LASSERT(!req->rq_sec_svcdata);
1210         OBD_ALLOC(svcdata, sizeof(*svcdata));
1211         if (!svcdata) {
1212                 CERROR("fail to alloc svcdata\n");
1213                 RETURN(SVC_DROP);
1214         }
1215         req->rq_sec_svcdata = svcdata;
1216         gc = &svcdata->clcred;
1217
1218         /* Now secdata/seclen is what we want to parse
1219          */
1220         version = le32_to_cpu(*secdata++);      /* version */
1221         svcdata->subflavor = le32_to_cpu(*secdata++);    /* subflavor */
1222         gc->gc_proc = le32_to_cpu(*secdata++);  /* proc */
1223         gc->gc_seq = le32_to_cpu(*secdata++);   /* seq */
1224         gc->gc_svc = le32_to_cpu(*secdata++);   /* service */
1225         seclen -= 5 * 4;
1226
1227         CDEBUG(D_SEC, "wire gss_hdr: %u/%u/%u/%u/%u\n",
1228                version, svcdata->subflavor, gc->gc_proc,
1229                gc->gc_seq, gc->gc_svc);
1230
1231         if (version != PTLRPC_SEC_GSS_VERSION) {
1232                 CERROR("gss version mismatch: %d - %d\n",
1233                         version, PTLRPC_SEC_GSS_VERSION);
1234                 GOTO(err_free, rc = SVC_DROP);
1235         }
1236
1237         if (rawobj_extract(&gc->gc_ctx, &secdata, &seclen)) {
1238                 CERROR("fail to obtain gss context handle\n");
1239                 GOTO(err_free, rc = SVC_DROP);
1240         }
1241
1242         *res = PTLRPCS_BADVERF;
1243         switch(gc->gc_proc) {
1244         case RPC_GSS_PROC_INIT:
1245         case RPC_GSS_PROC_CONTINUE_INIT:
1246                 rc = gss_svcsec_handle_init(req, gc, secdata, seclen, res);
1247                 break;
1248         case RPC_GSS_PROC_DATA:
1249                 rc = gss_svcsec_handle_data(req, gc, secdata, seclen, res);
1250                 break;
1251         case RPC_GSS_PROC_DESTROY:
1252                 rc = gss_svcsec_handle_destroy(req, gc, secdata, seclen, res);
1253                 break;
1254         default:
1255                 rc = SVC_DROP;
1256                 LBUG();
1257         }
1258
1259 err_free:
1260         if (rc == SVC_DROP && req->rq_sec_svcdata) {
1261                 OBD_FREE(req->rq_sec_svcdata, sizeof(struct gss_svc_data));
1262                 req->rq_sec_svcdata = NULL;
1263         }
1264
1265         RETURN(rc);
1266 }
1267
1268 static int
1269 gss_svcsec_authorize(struct ptlrpc_request *req)
1270 {
1271         struct ptlrpc_reply_state *rs = req->rq_reply_state;
1272         struct gss_svc_data *gsd = (struct gss_svc_data *)req->rq_sec_svcdata;
1273         struct rpc_gss_wire_cred  *gc = &gsd->clcred;
1274         struct rsc                *rscp;
1275         struct ptlrpcs_wire_hdr   *sec_hdr;
1276         rawobj_buf_t               msg_buf;
1277         rawobj_t                   cipher_buf;
1278         __u32                     *vp, *vpsave, major, vlen, seclen;
1279         rawobj_t                   lmsg, mic;
1280         int                        ret;
1281         ENTRY;
1282
1283         LASSERT(rs);
1284         LASSERT(rs->rs_repbuf);
1285         LASSERT(gsd);
1286
1287         if (gsd->is_init || gsd->is_init_continue ||
1288             gsd->is_err_notify || gsd->is_fini) {
1289                 /* nothing to do in these cases */
1290                 CDEBUG(D_SEC, "req %p: init/fini/err\n", req);
1291                 RETURN(0);
1292         }
1293
1294         if (gc->gc_proc != RPC_GSS_PROC_DATA) {
1295                 CERROR("proc %d not support\n", gc->gc_proc);
1296                 RETURN(-EINVAL);
1297         }
1298
1299         rscp = gss_svc_searchbyctx(&gc->gc_ctx);
1300         if (!rscp) {
1301                 CERROR("ctx disapeared under us?\n");
1302                 RETURN(-EINVAL);
1303         }
1304
1305         sec_hdr = (struct ptlrpcs_wire_hdr *) rs->rs_repbuf;
1306         switch (gc->gc_svc) {
1307         case  PTLRPC_GSS_SVC_INTEGRITY:
1308                 /* prepare various pointers */
1309                 lmsg.len = req->rq_replen;
1310                 lmsg.data = (__u8 *) (rs->rs_repbuf + sizeof(*sec_hdr));
1311                 vp = (__u32 *) (lmsg.data + lmsg.len);
1312                 vlen = rs->rs_repbuf_len - sizeof(*sec_hdr) - lmsg.len;
1313                 seclen = vlen;
1314
1315                 sec_hdr->flavor = cpu_to_le32(PTLRPC_SEC_GSS);
1316                 sec_hdr->sectype = cpu_to_le32(PTLRPC_SEC_TYPE_AUTH);
1317                 sec_hdr->msg_len = cpu_to_le32(req->rq_replen);
1318
1319                 /* standard gss hdr */
1320                 LASSERT(vlen >= 7 * 4);
1321                 *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_VERSION);
1322                 *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_KRB5I);
1323                 *vp++ = cpu_to_le32(RPC_GSS_PROC_DATA);
1324                 *vp++ = cpu_to_le32(gc->gc_seq);
1325                 *vp++ = cpu_to_le32(PTLRPC_GSS_SVC_INTEGRITY);
1326                 *vp++ = 0;      /* fake ctx handle */
1327                 vpsave = vp++;  /* reserve size */
1328                 vlen -= 7 * 4;
1329
1330                 mic.len = vlen;
1331                 mic.data = (unsigned char *)vp;
1332
1333                 major = kgss_get_mic(rscp->mechctx, 0, &lmsg, &mic);
1334                 if (major) {
1335                         CERROR("fail to get MIC: 0x%x\n", major);
1336                         GOTO(out, ret = -EINVAL);
1337                 }
1338                 *vpsave = cpu_to_le32(mic.len);
1339                 seclen = seclen - vlen + mic.len;
1340                 sec_hdr->sec_len = cpu_to_le32(seclen);
1341                 rs->rs_repdata_len += size_round(seclen);
1342                 break;
1343         case  PTLRPC_GSS_SVC_PRIVACY:
1344                 vp = (__u32 *) (rs->rs_repbuf + sizeof(*sec_hdr));
1345                 vlen = rs->rs_repbuf_len - sizeof(*sec_hdr);
1346                 seclen = vlen;
1347
1348                 sec_hdr->flavor = cpu_to_le32(PTLRPC_SEC_GSS);
1349                 sec_hdr->sectype = cpu_to_le32(PTLRPC_SEC_TYPE_PRIV);
1350                 sec_hdr->msg_len = cpu_to_le32(0);
1351
1352                 /* standard gss hdr */
1353                 LASSERT(vlen >= 7 * 4);
1354                 *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_VERSION);
1355                 *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_KRB5I);
1356                 *vp++ = cpu_to_le32(RPC_GSS_PROC_DATA);
1357                 *vp++ = cpu_to_le32(gc->gc_seq);
1358                 *vp++ = cpu_to_le32(PTLRPC_GSS_SVC_PRIVACY);
1359                 *vp++ = 0;      /* fake ctx handle */
1360                 vpsave = vp++;  /* reserve size */
1361                 vlen -= 7 * 4;
1362
1363                 msg_buf.buf = (__u8 *) rs->rs_msg - GSS_PRIVBUF_PREFIX_LEN;
1364                 msg_buf.buflen = req->rq_replen + GSS_PRIVBUF_PREFIX_LEN +
1365                                  GSS_PRIVBUF_SUFFIX_LEN;
1366                 msg_buf.dataoff = GSS_PRIVBUF_PREFIX_LEN;
1367                 msg_buf.datalen = req->rq_replen;
1368
1369                 cipher_buf.data = (__u8 *) vp;
1370                 cipher_buf.len = vlen;
1371
1372                 major = kgss_wrap(rscp->mechctx, GSS_C_QOP_DEFAULT,
1373                                 &msg_buf, &cipher_buf);
1374                 if (major) {
1375                         CERROR("failed to wrap: 0x%x\n", major);
1376                         GOTO(out, ret = -EINVAL);
1377                 }
1378
1379                 *vpsave = cpu_to_le32(cipher_buf.len);
1380                 seclen = seclen - vlen + cipher_buf.len;
1381                 sec_hdr->sec_len = cpu_to_le32(seclen);
1382                 rs->rs_repdata_len += size_round(seclen);
1383                 break;
1384         default:
1385                 CERROR("Unknown service %d\n", gc->gc_svc);
1386                 GOTO(out, ret = -EINVAL);
1387         }
1388         ret = 0;
1389 out:
1390         rsc_put(&rscp->h, &rsc_cache);
1391
1392         RETURN(ret);
1393 }
1394
1395 static
1396 void gss_svcsec_cleanup_req(struct ptlrpc_svcsec *svcsec,
1397                             struct ptlrpc_request *req)
1398 {
1399         struct gss_svc_data *gsd = (struct gss_svc_data *) req->rq_sec_svcdata;
1400
1401         if (!gsd) {
1402                 CDEBUG(D_SEC, "no svc_data present. do nothing\n");
1403                 return;
1404         }
1405
1406         /* gsd->clclred.gc_ctx is NOT allocated, just set pointer
1407          * to the incoming packet buffer, so don't need free it
1408          */
1409         OBD_FREE(gsd, sizeof(*gsd));
1410         req->rq_sec_svcdata = NULL;
1411         return;
1412 }
1413
1414 static
1415 int gss_svcsec_est_payload(struct ptlrpc_svcsec *svcsec,
1416                            struct ptlrpc_request *req,
1417                            int msgsize)
1418 {
1419         struct gss_svc_data *svcdata = req->rq_sec_svcdata;
1420         ENTRY;
1421
1422         /* just return the pre-set reserve_len for init/fini/err cases.
1423          */
1424         LASSERT(svcdata);
1425         if (svcdata->is_init) {
1426                 CDEBUG(D_SEC, "is_init, reserver size %d(%d)\n",
1427                        size_round(svcdata->reserve_len),
1428                        svcdata->reserve_len);
1429                 LASSERT(svcdata->reserve_len);
1430                 LASSERT(svcdata->reserve_len % 4 == 0);
1431                 RETURN(size_round(svcdata->reserve_len));
1432         } else if (svcdata->is_err_notify) {
1433                 CDEBUG(D_SEC, "is_err_notify, reserver size %d(%d)\n",
1434                        size_round(svcdata->reserve_len),
1435                        svcdata->reserve_len);
1436                 RETURN(size_round(svcdata->reserve_len));
1437         } else if (svcdata->is_fini) {
1438                 CDEBUG(D_SEC, "is_fini, reserver size 0\n");
1439                 RETURN(0);
1440         } else {
1441                 if (svcdata->clcred.gc_svc == PTLRPC_GSS_SVC_NONE ||
1442                     svcdata->clcred.gc_svc == PTLRPC_GSS_SVC_INTEGRITY)
1443                         RETURN(size_round(GSS_MAX_AUTH_PAYLOAD));
1444                 else if (svcdata->clcred.gc_svc == PTLRPC_GSS_SVC_PRIVACY)
1445                         RETURN(size_round16(GSS_MAX_AUTH_PAYLOAD + msgsize +
1446                                             GSS_PRIVBUF_PREFIX_LEN +
1447                                             GSS_PRIVBUF_SUFFIX_LEN));
1448                 else {
1449                         CERROR("unknown gss svc %u\n", svcdata->clcred.gc_svc);
1450                         *((int *)0) = 0;
1451                         LBUG();
1452                 }
1453         }
1454         RETURN(0);
1455 }
1456
1457 int gss_svcsec_alloc_repbuf(struct ptlrpc_svcsec *svcsec,
1458                             struct ptlrpc_request *req,
1459                             int msgsize)
1460 {
1461         struct gss_svc_data *gsd = (struct gss_svc_data *) req->rq_sec_svcdata;
1462         struct ptlrpc_reply_state *rs;
1463         int msg_payload, sec_payload;
1464         int privacy, rc;
1465         ENTRY;
1466
1467         /* determine the security type: none/auth or priv, we have
1468          * different pack scheme for them.
1469          * init/fini/err will always be treated as none/auth.
1470          */
1471         LASSERT(gsd);
1472         if (!gsd->is_init && !gsd->is_init_continue &&
1473             !gsd->is_fini && !gsd->is_err_notify &&
1474             gsd->clcred.gc_svc == PTLRPC_GSS_SVC_PRIVACY)
1475                 privacy = 1;
1476         else
1477                 privacy = 0;
1478
1479         msg_payload = privacy ? 0 : msgsize;
1480         sec_payload = gss_svcsec_est_payload(svcsec, req, msgsize);
1481
1482         rc = svcsec_alloc_reply_state(req, msg_payload, sec_payload);
1483         if (rc)
1484                 RETURN(rc);
1485
1486         rs = req->rq_reply_state;
1487         LASSERT(rs);
1488         rs->rs_msg_len = msgsize;
1489
1490         if (privacy) {
1491                 /* we can choose to let msg simply point to the rear of the
1492                  * buffer, which lead to buffer overlap when doing encryption.
1493                  * usually it's ok and it indeed passed all existing tests.
1494                  * but not sure if there will be subtle problems in the future.
1495                  * so right now we choose to alloc another new buffer. we'll
1496                  * see how it works.
1497                  */
1498 #if 0
1499                 rs->rs_msg = (struct lustre_msg *)
1500                              (rs->rs_repbuf + rs->rs_repbuf_len -
1501                               msgsize - GSS_PRIVBUF_SUFFIX_LEN);
1502 #endif
1503                 char *msgbuf;
1504
1505                 msgsize += GSS_PRIVBUF_PREFIX_LEN + GSS_PRIVBUF_SUFFIX_LEN;
1506                 OBD_ALLOC(msgbuf, msgsize);
1507                 if (!msgbuf) {
1508                         CERROR("can't alloc %d\n", msgsize);
1509                         svcsec_free_reply_state(rs);
1510                         req->rq_reply_state = NULL;
1511                         RETURN(-ENOMEM);
1512                 }
1513                 rs->rs_msg = (struct lustre_msg *)
1514                                 (msgbuf + GSS_PRIVBUF_PREFIX_LEN);
1515         }
1516
1517         req->rq_repmsg = rs->rs_msg;
1518
1519         RETURN(0);
1520 }
1521
1522 static
1523 void gss_svcsec_free_repbuf(struct ptlrpc_svcsec *svcsec,
1524                             struct ptlrpc_reply_state *rs)
1525 {
1526         unsigned long p1 = (unsigned long) rs->rs_msg;
1527         unsigned long p2 = (unsigned long) rs->rs_buf;
1528
1529         LASSERT(rs->rs_buf);
1530         LASSERT(rs->rs_msg);
1531         LASSERT(rs->rs_msg_len);
1532
1533         if (p1 < p2 || p1 >= p2 + rs->rs_buf_len) {
1534                 char *start = (char*) rs->rs_msg - GSS_PRIVBUF_PREFIX_LEN;
1535                 int size = rs->rs_msg_len + GSS_PRIVBUF_PREFIX_LEN +
1536                            GSS_PRIVBUF_SUFFIX_LEN;
1537                 OBD_FREE(start, size);
1538         }
1539
1540         svcsec_free_reply_state(rs);
1541 }
1542
1543 struct ptlrpc_svcsec svcsec_gss = {
1544         .pss_owner              = THIS_MODULE,
1545         .pss_name               = "GSS_SVCSEC",
1546         .pss_flavor             = {PTLRPC_SEC_GSS, 0},
1547         .accept                 = gss_svcsec_accept,
1548         .authorize              = gss_svcsec_authorize,
1549         .alloc_repbuf           = gss_svcsec_alloc_repbuf,
1550         .free_repbuf            = gss_svcsec_free_repbuf,
1551         .cleanup_req            = gss_svcsec_cleanup_req,
1552 };
1553
1554 /* XXX hacking */
1555 void lgss_svc_cache_purge_all(void)
1556 {
1557         cache_purge(&rsi_cache);
1558         cache_purge(&rsc_cache);
1559 }
1560 EXPORT_SYMBOL(lgss_svc_cache_purge_all);
1561
1562 void lgss_svc_cache_flush(__u32 uid)
1563 {
1564         rsc_flush(uid);
1565 }
1566 EXPORT_SYMBOL(lgss_svc_cache_flush);
1567
1568 int gss_svc_init(void)
1569 {
1570         int rc;
1571
1572         rc = svcsec_register(&svcsec_gss);
1573         if (!rc) {
1574                 cache_register(&rsc_cache);
1575                 cache_register(&rsi_cache);
1576         }
1577         return rc;
1578 }
1579
1580 void gss_svc_exit(void)
1581 {
1582         int rc;
1583         if ((rc = cache_unregister(&rsi_cache)))
1584                 CERROR("unregister rsi cache: %d\n", rc);
1585         if ((rc = cache_unregister(&rsc_cache)))
1586                 CERROR("unregister rsc cache: %d\n", rc);
1587         if ((rc = svcsec_unregister(&svcsec_gss)))
1588                 CERROR("unregister svcsec_gss: %d\n", rc);
1589 }