src/afs/afs_osi_pag.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 /*
  11  * Implements:
  12  * genpag
  13  * getpag
  14  * afs_setpag
  15  * AddPag
  16  * afs_InitReq
  17  * afs_get_pag_from_groups
  18  * afs_get_groups_from_pag
  19  * PagInCred
  20  */
  21
  22 #include <afsconfig.h>
  23 #include "afs/param.h"
  24
  25
  26 #include "afs/sysincludes.h"    /* Standard vendor system headers */
  27 #include "afsincludes.h"        /* Afs-based standard headers */
  28 #include "afs/afs_stats.h"      /* statistics */
  29 #include "afs/afs_cbqueue.h"
  30 #include "afs/nfsclient.h"
  31 #include "afs/afs_osidnlc.h"
  32
  33
  34 /* Imported variables */
  35 extern enum afs_shutdown_state afs_shuttingdown;
  36
  37 /* Exported variables */
  38 afs_uint32 pag_epoch;
  39 #if defined(UKERNEL)
  40 afs_uint32 pagCounter = 1;
  41 #else
  42 afs_uint32 pagCounter = 0;
  43 #endif /* UKERNEL */
  44
  45 /*
  46  * Pags are implemented as follows: the set of groups whose long
  47  * representation is '41XXXXXX' hex are used to represent the pags.
  48  * Being a member of such a group means you are authenticated as pag
  49  * XXXXXX (0x41 == 'A', for Andrew).  You are never authenticated as
  50  * multiple pags at once.
  51  *
  52  * The function afs_InitReq takes a credential field and formats the
  53  * corresponding venus request structure.  The uid field in the
  54  * vrequest structure is set to the *pag* you are authenticated as, or
  55  * the uid, if you aren't authenticated with a pag.
  56  *
  57  * The basic motivation behind pags is this: just because your unix
  58  * uid is N doesn't mean that you should have the same privileges as
  59  * anyone logged in on the machine as user N, since this would enable
  60  * the superuser on the machine to sneak in and make use of anyone's
  61  * authentication info, even that which is only accidentally left
  62  * behind when someone leaves a public workstation.
  63  *
  64  * AFS doesn't use the unix uid for anything except
  65  * a handle with which to find the actual authentication tokens
  66  * anyway, so the pag is an alternative handle which is somewhat more
  67  * secure (although of course not absolutely secure).
  68 */
  69 #if !defined(UKERNEL)
  70 afs_uint32
  71 genpag(void)
  72 {
  73     AFS_STATCNT(genpag);
  74 #ifdef AFS_LINUX20_ENV
  75     /* Ensure unique PAG's (mod 200 days) when reloading the client. */
  76     return (('A' << 24) + ((pag_epoch + pagCounter++) & 0xffffff));
  77 #else /* AFS_LINUX20_ENV */
  78     return (('A' << 24) + (pagCounter++ & 0xffffff));
  79 #endif /* AFS_LINUX20_ENV */
  80 }
  81
  82 afs_uint32
  83 getpag(void)
  84 {
  85     AFS_STATCNT(getpag);
  86 #ifdef AFS_LINUX20_ENV
  87     /* Ensure unique PAG's (mod 200 days) when reloading the client. */
  88     return (('A' << 24) + ((pag_epoch + pagCounter) & 0xffffff));
  89 #else
  90     return (('A' << 24) + (pagCounter & 0xffffff));
  91 #endif
  92 }
  93
  94 #else
  95
  96 /* Web enhancement: we don't need to restrict pags to 41XXXXXX since
  97  * we are not sharing the space with anyone.  So we use the full 32 bits. */
  98
  99 afs_uint32
 100 genpag(void)
 101 {
 102     AFS_STATCNT(genpag);
 103 #ifdef AFS_LINUX20_ENV
 104     return (pag_epoch + pagCounter++);
 105 #else
 106     return (pagCounter++);
 107 #endif /* AFS_LINUX20_ENV */
 108 }
 109
 110 afs_uint32
 111 getpag(void)
 112 {
 113     AFS_STATCNT(getpag);
 114 #ifdef AFS_LINUX20_ENV
 115     /* Ensure unique PAG's (mod 200 days) when reloading the client. */
 116     return (pag_epoch + pagCounter);
 117 #else
 118     return (pagCounter);
 119 #endif
 120 }
 121 #endif /* UKERNEL */
 122
 123 /* used to require 10 seconds between each setpag to guarantee that
 124  * PAGs never wrap - which would be a security hole.  If we presume
 125  * that in ordinary operation, the average rate of PAG allocation
 126  * will not exceed one per second, the 24 bits provided will be
 127  * sufficient for ~200 days.  Unfortunately, if we merely assume that,
 128  * there will be an opportunity for attack.  So we must enforce it.
 129  * If we need to increase the average rate of PAG allocation, we
 130  * should increase the number of bits in a PAG, and/or reduce our
 131  * window in which we guarantee that the PAG counter won't wrap.
 132  * By permitting an average of one new PAG per second, new PAGs can
 133  * be allocated VERY frequently over a short period relative to total uptime.
 134  * Of course, there's only an issue here if one user stays logged (and re-
 135  * activates tokens repeatedly) for that entire period.
 136  */
 137
 138 static int afs_pag_sleepcnt = 0;
 139 static int afs_pag_timewarn = 0;
 140
 141 static int
 142 afs_pag_sleep(afs_ucred_t **acred)
 143 {
 144     int rv = 0;
 145
 146     if (!afs_suser(acred)) {
 147         if(osi_Time() - pag_epoch < pagCounter) {
 148             rv = 1;
 149         }
 150         if (rv && (osi_Time() < pag_epoch)) {
 151             if (!afs_pag_timewarn) {
 152                 afs_pag_timewarn = 1;
 153                 afs_warn("clock went backwards, not PAG throttling");
 154             }
 155             rv = 0;
 156         }
 157     }
 158
 159     return rv;
 160 }
 161
 162 static int
 163 afs_pag_wait(afs_ucred_t **acred)
 164 {
 165     if (afs_pag_sleep(acred)) {
 166         if (!afs_pag_sleepcnt) {
 167             afs_warn("%s() PAG throttling triggered, pid %d... sleeping.  sleepcnt %d\n",
 168                      "afs_pag_wait", osi_getpid(), afs_pag_sleepcnt);
 169         }
 170
 171         afs_pag_sleepcnt++;
 172
 173         do {
 174             /* XXX spins on EINTR */
 175             afs_osi_Wait(1000, (struct afs_osi_WaitHandle *)0, 0);
 176         } while (afs_pag_sleep(acred));
 177
 178         afs_pag_sleepcnt--;
 179     }
 180
 181     return 0;
 182 }
 183
 184 int
 185 #if     defined(AFS_SUN5_ENV)
 186 afs_setpag(afs_ucred_t **credpp)
 187 #elif   defined(AFS_FBSD_ENV)
 188 afs_setpag(struct thread *td, void *args)
 189 #elif   defined(AFS_NBSD_ENV)
 190 afs_setpag(afs_proc_t *p, const void *args, register_t *retval)
 191 #elif  defined(AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV)
 192 afs_setpag(afs_proc_t *p, void *args, int *retval)
 193 #else
 194 afs_setpag(void)
 195 #endif
 196 {
 197
 198 #if     defined(AFS_SUN5_ENV)
 199     afs_ucred_t **acred = *credpp;
 200 #elif  defined(AFS_OBSD_ENV)
 201     afs_ucred_t **acred = &p->p_ucred;
 202 #else
 203     afs_ucred_t **acred = NULL;
 204 #endif
 205
 206     int code = 0;
 207
 208 #if defined(AFS_SGI53_ENV) && defined(MP)
 209     /* This is our first chance to get the global lock. */
 210     AFS_GLOCK();
 211 #endif /* defined(AFS_SGI53_ENV) && defined(MP) */
 212
 213     AFS_STATCNT(afs_setpag);
 214
 215     afs_pag_wait(acred);
 216
 217
 218 #if     defined(AFS_SUN5_ENV)
 219     code = AddPag(genpag(), credpp);
 220 #elif   defined(AFS_FBSD_ENV)
 221     code = AddPag(td, genpag(), &td->td_ucred);
 222 #elif   defined(AFS_NBSD40_ENV)
 223     code = AddPag(p, genpag(), &p->l_proc->p_cred);
 224 #elif   defined(AFS_XBSD_ENV)
 225     code = AddPag(p, genpag(), &p->p_rcred);
 226 #elif   defined(AFS_AIX41_ENV)
 227     {
 228         struct ucred *credp;
 229         struct ucred *credp0;
 230
 231         credp = crref();
 232         credp0 = credp;
 233         code = AddPag(genpag(), &credp);
 234         /* If AddPag() didn't make a new cred, then free our cred ref */
 235         if (credp == credp0) {
 236             crfree(credp);
 237         }
 238     }
 239 #elif   defined(AFS_HPUX110_ENV)
 240     {
 241         struct ucred *credp = p_cred(u.u_procp);
 242         code = AddPag(genpag(), &credp);
 243     }
 244 #elif   defined(AFS_SGI_ENV)
 245     {
 246         cred_t *credp;
 247         credp = OSI_GET_CURRENT_CRED();
 248         code = AddPag(genpag(), &credp);
 249     }
 250 #elif   defined(AFS_LINUX20_ENV)
 251     {
 252         afs_ucred_t *credp = crref();
 253         code = AddPag(genpag(), &credp);
 254         crfree(credp);
 255     }
 256 #elif defined(AFS_DARWIN80_ENV)
 257     {
 258         afs_ucred_t *credp = kauth_cred_proc_ref(p);
 259         code = AddPag(p, genpag(), &credp);
 260         crfree(credp);
 261     }
 262 #elif defined(AFS_DARWIN_ENV)
 263     {
 264         afs_ucred_t *credp = crdup(p->p_cred->pc_ucred);
 265         code = AddPag(p, genpag(), &credp);
 266         crfree(credp);
 267     }
 268 #elif defined(UKERNEL)
 269     code = AddPag(genpag(), &(get_user_struct()->u_cred));
 270 #else
 271     code = AddPag(genpag(), &u.u_cred);
 272 #endif
 273
 274     afs_Trace1(afs_iclSetp, CM_TRACE_SETPAG, ICL_TYPE_INT32, code);
 275
 276 #if defined(KERNEL_HAVE_UERROR)
 277     if (!getuerror())
 278         setuerror(code);
 279 #endif
 280
 281 #if defined(AFS_SGI53_ENV) && defined(MP)
 282     AFS_GUNLOCK();
 283 #endif /* defined(AFS_SGI53_ENV) && defined(MP) */
 284
 285     return (code);
 286 }
 287
 288 #if defined(UKERNEL)
 289 /*
 290  * afs_setpag_val
 291  * This function is like setpag but sets the current thread's pag id to a
 292  * caller-provided value instead of calling genpag().  This implements a
 293  * form of token caching since the caller can recall a particular pag value
 294  * for the thread to restore tokens, rather than reauthenticating.
 295  */
 296 int
 297 #if     defined(AFS_SUN5_ENV)
 298 afs_setpag_val(afs_ucred_t **credpp, int pagval)
 299 #elif   defined(AFS_FBSD_ENV)
 300 afs_setpag_val(struct thread *td, void *args, int pagval)
 301 #elif  defined(AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV)
 302 afs_setpag_val(afs_proc_t *p, void *args, int *retval, int pagval)
 303 #else
 304 afs_setpag_val(int pagval)
 305 #endif
 306 {
 307
 308 #if     defined(AFS_SUN5_ENV)
 309     afs_ucred_t **acred = *credp;
 310 #elif  defined(AFS_OBSD_ENV)
 311     afs_ucred_t **acred = &p->p_ucred;
 312 #else
 313     afs_ucred_t **acred = NULL;
 314 #endif
 315
 316     int code = 0;
 317
 318 #if defined(AFS_SGI53_ENV) && defined(MP)
 319     /* This is our first chance to get the global lock. */
 320     AFS_GLOCK();
 321 #endif /* defined(AFS_SGI53_ENV) && defined(MP) */
 322
 323     AFS_STATCNT(afs_setpag);
 324
 325     afs_pag_wait(acred);
 326
 327 #if     defined(AFS_SUN5_ENV)
 328     code = AddPag(pagval, credpp);
 329 #elif   defined(AFS_FBSD_ENV)
 330     code = AddPag(td, pagval, &td->td_ucred);
 331 #elif   defined(AFS_XBSD_ENV)
 332     code = AddPag(p, pagval, &p->p_rcred);
 333 #elif   defined(AFS_AIX41_ENV)
 334     {
 335         struct ucred *credp;
 336         struct ucred *credp0;
 337
 338         credp = crref();
 339         credp0 = credp;
 340         code = AddPag(pagval, &credp);
 341         /* If AddPag() didn't make a new cred, then free our cred ref */
 342         if (credp == credp0) {
 343             crfree(credp);
 344         }
 345     }
 346 #elif   defined(AFS_HPUX110_ENV)
 347     {
 348         struct ucred *credp = p_cred(u.u_procp);
 349         code = AddPag(pagval, &credp);
 350     }
 351 #elif   defined(AFS_SGI_ENV)
 352     {
 353         cred_t *credp;
 354         credp = OSI_GET_CURRENT_CRED();
 355         code = AddPag(pagval, &credp);
 356     }
 357 #elif   defined(AFS_LINUX20_ENV)
 358     {
 359         afs_ucred_t *credp = crref();
 360         code = AddPag(pagval, &credp);
 361         crfree(credp);
 362     }
 363 #elif defined(AFS_DARWIN_ENV)
 364     {
 365         struct ucred *credp = crdup(p->p_cred->pc_ucred);
 366         code = AddPag(p, pagval, &credp);
 367         crfree(credp);
 368     }
 369 #elif defined(UKERNEL)
 370     code = AddPag(pagval, &(get_user_struct()->u_cred));
 371 #else
 372     code = AddPag(pagval, &u.u_cred);
 373 #endif
 374
 375     afs_Trace1(afs_iclSetp, CM_TRACE_SETPAG, ICL_TYPE_INT32, code);
 376 #if defined(KERNEL_HAVE_UERROR)
 377     if (!getuerror())
 378         setuerror(code);
 379 #endif
 380 #if defined(AFS_SGI53_ENV) && defined(MP)
 381     AFS_GUNLOCK();
 382 #endif /* defined(AFS_SGI53_ENV) && defined(MP) */
 383     return (code);
 384 }
 385
 386 #ifndef AFS_PAG_ONEGROUP_ENV
 387 int
 388 afs_getpag_val(void)
 389 {
 390     int pagvalue;
 391 #ifdef UKERNEL
 392     afs_ucred_t *credp = get_user_struct()->u_cred;
 393 #else
 394     afs_ucred_t *credp = u.u_cred;
 395 #endif
 396     gid_t gidset0, gidset1;
 397 #ifdef AFS_SUN510_ENV
 398     const gid_t *gids;
 399
 400     gids = crgetgroups(*credp);
 401     gidset0 = gids[0];
 402     gidset1 = gids[1];
 403 #else
 404     gidset0 = credp->cr_groups[0];
 405     gidset1 = credp->cr_groups[1];
 406 #endif
 407     pagvalue = afs_get_pag_from_groups(gidset0, gidset1);
 408     return pagvalue;
 409 }
 410 #endif
 411 #endif /* UKERNEL */
 412
 413
 414 /* Note - needs to be available on AIX, others can be static - rework this */
 415 int
 416 #if defined(AFS_FBSD_ENV)
 417 AddPag(struct thread *p, afs_int32 aval, afs_ucred_t **credpp)
 418 #elif defined(AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV)
 419 AddPag(afs_proc_t *p, afs_int32 aval, afs_ucred_t **credpp)
 420 #else
 421 AddPag(afs_int32 aval, afs_ucred_t **credpp)
 422 #endif
 423 {
 424     afs_int32 code;
 425     afs_uint32 newpag;
 426
 427     AFS_STATCNT(AddPag);
 428 #if defined(AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV)
 429     if ((code = setpag(p, credpp, aval, &newpag, 0)))
 430 #else
 431     if ((code = setpag(credpp, aval, &newpag, 0)))
 432 #endif
 433 #if defined(KERNEL_HAVE_UERROR)
 434         return (setuerror(code), code);
 435 #else
 436         return (code);
 437 #endif
 438     return 0;
 439 }
 440
 441
 442 int
 443 afs_InitReq(struct vrequest *av, afs_ucred_t *acred)
 444 {
 445 #if defined(AFS_LINUX26_ENV) && !defined(AFS_NONFSTRANS)
 446     int code;
 447 #endif
 448
 449     AFS_STATCNT(afs_InitReq);
 450     memset(av, 0, sizeof(*av));
 451     if (afs_shuttingdown == AFS_SHUTDOWN)
 452         return EIO;
 453
 454 #ifdef AFS_LINUX26_ENV
 455 #if !defined(AFS_NONFSTRANS)
 456     if (osi_linux_nfs_initreq(av, acred, &code))
 457         return code;
 458 #endif
 459 #endif
 460
 461     av->uid = PagInCred(acred);
 462     if (av->uid == NOPAG) {
 463         /* Afs doesn't use the unix uid for anuthing except a handle
 464          * with which to find the actual authentication tokens so I
 465          * think it's ok to use the real uid to make setuid
 466          * programs (without setpag) to work properly.
 467          */
 468 #if defined(AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV)
 469         if (acred == NOCRED)
 470             av->uid = -2;       /* XXX nobody... ? */
 471         else
 472             av->uid = afs_cr_uid(acred);        /* bsd creds don't have ruid */
 473 #elif defined(AFS_SUN510_ENV)
 474         av->uid = crgetruid(acred);
 475 #else
 476         av->uid = afs_cr_ruid(acred);   /* default when no pag is set */
 477 #endif
 478     }
 479     return 0;
 480 }
 481
 482 /*!
 483  * Allocate and setup a vrequest.
 484  *
 485  * \note The caller must free the allocated vrequest with
 486  *       afs_DestroyReq() if this function returns successfully (zero).
 487  *
 488  * \note The GLOCK must be held on platforms which require the GLOCK
 489  *       for osi_AllocSmallSpace() and osi_FreeSmallSpace().
 490  *
 491  * \param[out] avpp   address of the vrequest pointer
 492  * \param[in]  acred  user credentials to setup the vrequest
 493  *                    afs_osi_credp should be used for anonymous connections
 494  * \return     0 on success
 495  */
 496 int
 497 afs_CreateReq(struct vrequest **avpp, afs_ucred_t *acred)
 498 {
 499     int code;
 500     struct vrequest *treq = NULL;
 501
 502     if (afs_shuttingdown == AFS_SHUTDOWN) {
 503         return EIO;
 504     }
 505     if (!avpp || !acred) {
 506         return EINVAL;
 507     }
 508     treq = osi_AllocSmallSpace(sizeof(struct vrequest));
 509     if (!treq) {
 510         return ENOMEM;
 511     }
 512     code = afs_InitReq(treq, acred);
 513     if (code != 0) {
 514         osi_FreeSmallSpace(treq);
 515         return code;
 516     }
 517     *avpp = treq;
 518     return 0;
 519 }
 520
 521 /*!
 522  * Deallocate a vrequest.
 523  *
 524  * \note The GLOCK must be held on platforms which require the GLOCK
 525  *       for osi_FreeSmallSpace().
 526  *
 527  * \param[in]  av  pointer to the vrequest to free; may be NULL
 528  */
 529 void
 530 afs_DestroyReq(struct vrequest *av)
 531 {
 532     if (av) {
 533         osi_FreeSmallSpace(av);
 534     }
 535 }
 536
 537 afs_uint32
 538 afs_get_pag_from_groups(gid_t g0a, gid_t g1a)
 539 {
 540     afs_uint32 g0 = g0a;
 541     afs_uint32 g1 = g1a;
 542     afs_uint32 h, l, ret;
 543
 544     AFS_STATCNT(afs_get_pag_from_groups);
 545
 546     g0 -= 0x3f00;
 547     g1 -= 0x3f00;
 548     if (g0 < 0xc000 && g1 < 0xc000) {
 549         l = ((g0 & 0x3fff) << 14) | (g1 & 0x3fff);
 550         h = (g0 >> 14);
 551         h = (g1 >> 14) + h + h + h;
 552         ret = ((h << 28) | l);
 553 # if defined(UKERNEL)
 554         return ret;
 555 # else
 556         /* Additional testing */
 557         if (((ret >> 24) & 0xff) == 'A')
 558             return ret;
 559 # endif /* UKERNEL */
 560     }
 561     return NOPAG;
 562 }
 563
 564 #ifndef AFS_PAG_ONEGROUP_ENV
 565 void
 566 afs_get_groups_from_pag(afs_uint32 pag, gid_t * g0p, gid_t * g1p)
 567 {
 568     unsigned short g0, g1;
 569
 570     AFS_STATCNT(afs_get_groups_from_pag);
 571     *g0p = pag;
 572     *g1p = 0;
 573 # if !defined(UKERNEL)
 574     pag &= 0x7fffffff;
 575 # endif /* UKERNEL */
 576     g0 = 0x3fff & (pag >> 14);
 577     g1 = 0x3fff & pag;
 578     g0 |= ((pag >> 28) / 3) << 14;
 579     g1 |= ((pag >> 28) % 3) << 14;
 580     *g0p = g0 + 0x3f00;
 581     *g1p = g1 + 0x3f00;
 582 }
 583 #else
 584 void
 585 afs_get_groups_from_pag(afs_uint32 pag, gid_t *g0p, gid_t *g1p)
 586 {
 587     AFS_STATCNT(afs_get_groups_from_pag);
 588     *g0p = pag;
 589     *g1p = 0;
 590 }
 591 #endif
 592
 593 #ifdef AFS_LINUX26_ENV
 594 /* osi_get_group_pag is defined in <ARCH>/osi_groups.c */
 595 #elif defined(AFS_PAG_ONEGROUP_ENV)
 596 /* osi_get_group_pag is defined in <ARCH>/osi_groups.c */
 597 #elif defined(AFS_DARWIN110_ENV)
 598 /* We don't have pags, so we do not define an osi_get_group_pag */
 599 #else
 600 static afs_int32
 601 osi_get_group_pag(afs_ucred_t *cred)
 602 {
 603     afs_int32 pag = NOPAG;
 604     gid_t g0, g1;
 605 #if defined(AFS_SUN510_ENV)
 606     const gid_t *gids;
 607     int ngroups;
 608 #endif
 609
 610 #if defined(AFS_SUN510_ENV)
 611     gids = crgetgroups(cred);
 612     ngroups = crgetngroups(cred);
 613 #endif
 614 #if defined(AFS_NBSD40_ENV)
 615     if (cred == NOCRED || cred == FSCRED)
 616       return NOPAG;
 617     if (osi_crngroups(cred) < 3)
 618       return NOPAG;
 619     g0 = osi_crgroupbyid(cred, 1);
 620     g1 = osi_crgroupbyid(cred, 2);
 621 #elif defined(AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV)
 622     if (cred == NOCRED || cred == FSCRED)
 623         return NOPAG;
 624     if (cred->cr_ngroups < 3)
 625         return NOPAG;
 626     /* gid is stored in cr_groups[0] */
 627     g0 = cred->cr_groups[1];
 628     g1 = cred->cr_groups[2];
 629 #else
 630 # if defined(AFS_AIX_ENV)
 631     if (cred->cr_ngrps < 2)
 632         return NOPAG;
 633 # elif defined(AFS_LINUX26_ENV)
 634     if (afs_cr_group_info(cred)->ngroups < AFS_NUMPAGGROUPS)
 635         return NOPAG;
 636 # elif defined(AFS_SGI_ENV) || defined(AFS_SUN5_ENV) || defined(AFS_LINUX20_ENV) || defined(AFS_XBSD_ENV)
 637 #  if defined(AFS_SUN510_ENV)
 638     if (ngroups < 2) {
 639 #  else
 640     if (cred->cr_ngroups < 2) {
 641 #  endif
 642         return NOPAG;
 643     }
 644 # endif
 645 # if defined(AFS_AIX51_ENV)
 646     g0 = cred->cr_groupset.gs_union.un_groups[0];
 647     g1 = cred->cr_groupset.gs_union.un_groups[1];
 648 #elif defined(AFS_SUN510_ENV)
 649     g0 = gids[0];
 650     g1 = gids[1];
 651 #else
 652     g0 = cred->cr_groups[0];
 653     g1 = cred->cr_groups[1];
 654 #endif
 655 #endif
 656     pag = (afs_int32) afs_get_pag_from_groups(g0, g1);
 657     return pag;
 658 }
 659 #endif
 660
 661
 662 afs_int32
 663 PagInCred(afs_ucred_t *cred)
 664 {
 665     afs_int32 pag = NOPAG;
 666
 667     AFS_STATCNT(PagInCred);
 668     if (cred == NULL || cred == afs_osi_credp) {
 669         return NOPAG;
 670     }
 671 #ifndef AFS_DARWIN110_ENV
 672 #if defined(AFS_LINUX26_ENV) && defined(LINUX_KEYRING_SUPPORT)
 673     /*
 674      * If linux keyrings are in use and we carry the session keyring in our credentials
 675      * structure, they should be the only criteria for determining
 676      * if we're in a PAG.  Groups are updated for legacy reasons only for now,
 677      * and should not be used to infer PAG membership
 678      * With keyrings but no kernel credentials, look at groups first and fall back
 679      * to looking at the keyrings.
 680      */
 681 # if !defined(STRUCT_TASK_STRUCT_HAS_CRED)
 682     pag = osi_get_group_pag(cred);
 683 # endif
 684     if (pag == NOPAG)
 685         pag = osi_get_keyring_pag(cred);
 686 #elif defined(AFS_AIX51_ENV)
 687     if (kcred_getpag(cred, PAG_AFS, &pag) < 0 || pag == 0)
 688         pag = NOPAG;
 689 #else
 690     pag = osi_get_group_pag(cred);
 691 #endif
 692 #endif
 693     return pag;
 694 }