net/sunrpc/svcauth_unix.c

   1 #include <linux/types.h>
   2 #include <linux/sched.h>
   3 #include <linux/module.h>
   4 #include <linux/sunrpc/types.h>
   5 #include <linux/sunrpc/xdr.h>
   6 #include <linux/sunrpc/svcsock.h>
   7 #include <linux/sunrpc/svcauth.h>
   8 #include <linux/sunrpc/gss_api.h>
   9 #include <linux/err.h>
  10 #include <linux/seq_file.h>
  11 #include <linux/hash.h>
  12 #include <linux/string.h>
  13 #include <net/sock.h>
  14
  15 #define RPCDBG_FACILITY RPCDBG_AUTH
  16
  17
  18 /*
  19  * AUTHUNIX and AUTHNULL credentials are both handled here.
  20  * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
  21  * are always nobody (-2).  i.e. we do the same IP address checks for
  22  * AUTHNULL as for AUTHUNIX, and that is done here.
  23  */
  24
  25
  26 struct unix_domain {
  27         struct auth_domain      h;
  28         int     addr_changes;
  29         /* other stuff later */
  30 };
  31
  32 extern struct auth_ops svcauth_unix;
  33
  34 struct auth_domain *unix_domain_find(char *name)
  35 {
  36         struct auth_domain *rv;
  37         struct unix_domain *new = NULL;
  38
  39         rv = auth_domain_lookup(name, NULL);
  40         while(1) {
  41                 if (rv) {
  42                         if (new && rv != &new->h)
  43                                 auth_domain_put(&new->h);
  44
  45                         if (rv->flavour != &svcauth_unix) {
  46                                 auth_domain_put(rv);
  47                                 return NULL;
  48                         }
  49                         return rv;
  50                 }
  51
  52                 new = kmalloc(sizeof(*new), GFP_KERNEL);
  53                 if (new == NULL)
  54                         return NULL;
  55                 kref_init(&new->h.ref);
  56                 new->h.name = kstrdup(name, GFP_KERNEL);
  57                 if (new->h.name == NULL) {
  58                         kfree(new);
  59                         return NULL;
  60                 }
  61                 new->h.flavour = &svcauth_unix;
  62                 new->addr_changes = 0;
  63                 rv = auth_domain_lookup(name, &new->h);
  64         }
  65 }
  66 EXPORT_SYMBOL(unix_domain_find);
  67
  68 static void svcauth_unix_domain_release(struct auth_domain *dom)
  69 {
  70         struct unix_domain *ud = container_of(dom, struct unix_domain, h);
  71
  72         kfree(dom->name);
  73         kfree(ud);
  74 }
  75
  76
  77 /**************************************************
  78  * cache for IP address to unix_domain
  79  * as needed by AUTH_UNIX
  80  */
  81 #define IP_HASHBITS     8
  82 #define IP_HASHMAX      (1<<IP_HASHBITS)
  83 #define IP_HASHMASK     (IP_HASHMAX-1)
  84
  85 struct ip_map {
  86         struct cache_head       h;
  87         char                    m_class[8]; /* e.g. "nfsd" */
  88         struct in_addr          m_addr;
  89         struct unix_domain      *m_client;
  90         int                     m_add_change;
  91 };
  92 static struct cache_head        *ip_table[IP_HASHMAX];
  93
  94 static void ip_map_put(struct kref *kref)
  95 {
  96         struct cache_head *item = container_of(kref, struct cache_head, ref);
  97         struct ip_map *im = container_of(item, struct ip_map,h);
  98
  99         if (test_bit(CACHE_VALID, &item->flags) &&
 100             !test_bit(CACHE_NEGATIVE, &item->flags))
 101                 auth_domain_put(&im->m_client->h);
 102         kfree(im);
 103 }
 104
 105 #if IP_HASHBITS == 8
 106 /* hash_long on a 64 bit machine is currently REALLY BAD for
 107  * IP addresses in reverse-endian (i.e. on a little-endian machine).
 108  * So use a trivial but reliable hash instead
 109  */
 110 static inline int hash_ip(__be32 ip)
 111 {
 112         int hash = (__force u32)ip ^ ((__force u32)ip>>16);
 113         return (hash ^ (hash>>8)) & 0xff;
 114 }
 115 #endif
 116 static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
 117 {
 118         struct ip_map *orig = container_of(corig, struct ip_map, h);
 119         struct ip_map *new = container_of(cnew, struct ip_map, h);
 120         return strcmp(orig->m_class, new->m_class) == 0
 121                 && orig->m_addr.s_addr == new->m_addr.s_addr;
 122 }
 123 static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
 124 {
 125         struct ip_map *new = container_of(cnew, struct ip_map, h);
 126         struct ip_map *item = container_of(citem, struct ip_map, h);
 127
 128         strcpy(new->m_class, item->m_class);
 129         new->m_addr.s_addr = item->m_addr.s_addr;
 130 }
 131 static void update(struct cache_head *cnew, struct cache_head *citem)
 132 {
 133         struct ip_map *new = container_of(cnew, struct ip_map, h);
 134         struct ip_map *item = container_of(citem, struct ip_map, h);
 135
 136         kref_get(&item->m_client->h.ref);
 137         new->m_client = item->m_client;
 138         new->m_add_change = item->m_add_change;
 139 }
 140 static struct cache_head *ip_map_alloc(void)
 141 {
 142         struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
 143         if (i)
 144                 return &i->h;
 145         else
 146                 return NULL;
 147 }
 148
 149 static void ip_map_request(struct cache_detail *cd,
 150                                   struct cache_head *h,
 151                                   char **bpp, int *blen)
 152 {
 153         char text_addr[20];
 154         struct ip_map *im = container_of(h, struct ip_map, h);
 155         __be32 addr = im->m_addr.s_addr;
 156
 157         snprintf(text_addr, 20, "%u.%u.%u.%u",
 158                  ntohl(addr) >> 24 & 0xff,
 159                  ntohl(addr) >> 16 & 0xff,
 160                  ntohl(addr) >>  8 & 0xff,
 161                  ntohl(addr) >>  0 & 0xff);
 162
 163         qword_add(bpp, blen, im->m_class);
 164         qword_add(bpp, blen, text_addr);
 165         (*bpp)[-1] = '\n';
 166 }
 167
 168 static struct ip_map *ip_map_lookup(char *class, struct in_addr addr);
 169 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
 170
 171 static int ip_map_parse(struct cache_detail *cd,
 172                           char *mesg, int mlen)
 173 {
 174         /* class ipaddress [domainname] */
 175         /* should be safe just to use the start of the input buffer
 176          * for scratch: */
 177         char *buf = mesg;
 178         int len;
 179         int b1,b2,b3,b4;
 180         char c;
 181         char class[8];
 182         struct in_addr addr;
 183         int err;
 184
 185         struct ip_map *ipmp;
 186         struct auth_domain *dom;
 187         time_t expiry;
 188
 189         if (mesg[mlen-1] != '\n')
 190                 return -EINVAL;
 191         mesg[mlen-1] = 0;
 192
 193         /* class */
 194         len = qword_get(&mesg, class, sizeof(class));
 195         if (len <= 0) return -EINVAL;
 196
 197         /* ip address */
 198         len = qword_get(&mesg, buf, mlen);
 199         if (len <= 0) return -EINVAL;
 200
 201         if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
 202                 return -EINVAL;
 203
 204         expiry = get_expiry(&mesg);
 205         if (expiry ==0)
 206                 return -EINVAL;
 207
 208         /* domainname, or empty for NEGATIVE */
 209         len = qword_get(&mesg, buf, mlen);
 210         if (len < 0) return -EINVAL;
 211
 212         if (len) {
 213                 dom = unix_domain_find(buf);
 214                 if (dom == NULL)
 215                         return -ENOENT;
 216         } else
 217                 dom = NULL;
 218
 219         addr.s_addr =
 220                 htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
 221
 222         ipmp = ip_map_lookup(class,addr);
 223         if (ipmp) {
 224                 err = ip_map_update(ipmp,
 225                              container_of(dom, struct unix_domain, h),
 226                              expiry);
 227         } else
 228                 err = -ENOMEM;
 229
 230         if (dom)
 231                 auth_domain_put(dom);
 232
 233         cache_flush();
 234         return err;
 235 }
 236
 237 static int ip_map_show(struct seq_file *m,
 238                        struct cache_detail *cd,
 239                        struct cache_head *h)
 240 {
 241         struct ip_map *im;
 242         struct in_addr addr;
 243         char *dom = "-no-domain-";
 244
 245         if (h == NULL) {
 246                 seq_puts(m, "#class IP domain\n");
 247                 return 0;
 248         }
 249         im = container_of(h, struct ip_map, h);
 250         /* class addr domain */
 251         addr = im->m_addr;
 252
 253         if (test_bit(CACHE_VALID, &h->flags) &&
 254             !test_bit(CACHE_NEGATIVE, &h->flags))
 255                 dom = im->m_client->h.name;
 256
 257         seq_printf(m, "%s %d.%d.%d.%d %s\n",
 258                    im->m_class,
 259                    ntohl(addr.s_addr) >> 24 & 0xff,
 260                    ntohl(addr.s_addr) >> 16 & 0xff,
 261                    ntohl(addr.s_addr) >>  8 & 0xff,
 262                    ntohl(addr.s_addr) >>  0 & 0xff,
 263                    dom
 264                    );
 265         return 0;
 266 }
 267
 268
 269 struct cache_detail ip_map_cache = {
 270         .owner          = THIS_MODULE,
 271         .hash_size      = IP_HASHMAX,
 272         .hash_table     = ip_table,
 273         .name           = "auth.unix.ip",
 274         .cache_put      = ip_map_put,
 275         .cache_request  = ip_map_request,
 276         .cache_parse    = ip_map_parse,
 277         .cache_show     = ip_map_show,
 278         .match          = ip_map_match,
 279         .init           = ip_map_init,
 280         .update         = update,
 281         .alloc          = ip_map_alloc,
 282 };
 283
 284 static struct ip_map *ip_map_lookup(char *class, struct in_addr addr)
 285 {
 286         struct ip_map ip;
 287         struct cache_head *ch;
 288
 289         strcpy(ip.m_class, class);
 290         ip.m_addr = addr;
 291         ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
 292                                  hash_str(class, IP_HASHBITS) ^
 293                                  hash_ip(addr.s_addr));
 294
 295         if (ch)
 296                 return container_of(ch, struct ip_map, h);
 297         else
 298                 return NULL;
 299 }
 300
 301 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry)
 302 {
 303         struct ip_map ip;
 304         struct cache_head *ch;
 305
 306         ip.m_client = udom;
 307         ip.h.flags = 0;
 308         if (!udom)
 309                 set_bit(CACHE_NEGATIVE, &ip.h.flags);
 310         else {
 311                 ip.m_add_change = udom->addr_changes;
 312                 /* if this is from the legacy set_client system call,
 313                  * we need m_add_change to be one higher
 314                  */
 315                 if (expiry == NEVER)
 316                         ip.m_add_change++;
 317         }
 318         ip.h.expiry_time = expiry;
 319         ch = sunrpc_cache_update(&ip_map_cache,
 320                                  &ip.h, &ipm->h,
 321                                  hash_str(ipm->m_class, IP_HASHBITS) ^
 322                                  hash_ip(ipm->m_addr.s_addr));
 323         if (!ch)
 324                 return -ENOMEM;
 325         cache_put(ch, &ip_map_cache);
 326         return 0;
 327 }
 328
 329 int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom)
 330 {
 331         struct unix_domain *udom;
 332         struct ip_map *ipmp;
 333
 334         if (dom->flavour != &svcauth_unix)
 335                 return -EINVAL;
 336         udom = container_of(dom, struct unix_domain, h);
 337         ipmp = ip_map_lookup("nfsd", addr);
 338
 339         if (ipmp)
 340                 return ip_map_update(ipmp, udom, NEVER);
 341         else
 342                 return -ENOMEM;
 343 }
 344 EXPORT_SYMBOL(auth_unix_add_addr);
 345
 346 int auth_unix_forget_old(struct auth_domain *dom)
 347 {
 348         struct unix_domain *udom;
 349
 350         if (dom->flavour != &svcauth_unix)
 351                 return -EINVAL;
 352         udom = container_of(dom, struct unix_domain, h);
 353         udom->addr_changes++;
 354         return 0;
 355 }
 356 EXPORT_SYMBOL(auth_unix_forget_old);
 357
 358 struct auth_domain *auth_unix_lookup(struct in_addr addr)
 359 {
 360         struct ip_map *ipm;
 361         struct auth_domain *rv;
 362
 363         ipm = ip_map_lookup("nfsd", addr);
 364
 365         if (!ipm)
 366                 return NULL;
 367         if (cache_check(&ip_map_cache, &ipm->h, NULL))
 368                 return NULL;
 369
 370         if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
 371                 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
 372                         auth_domain_put(&ipm->m_client->h);
 373                 rv = NULL;
 374         } else {
 375                 rv = &ipm->m_client->h;
 376                 kref_get(&rv->ref);
 377         }
 378         cache_put(&ipm->h, &ip_map_cache);
 379         return rv;
 380 }
 381 EXPORT_SYMBOL(auth_unix_lookup);
 382
 383 void svcauth_unix_purge(void)
 384 {
 385         cache_purge(&ip_map_cache);
 386 }
 387 EXPORT_SYMBOL(svcauth_unix_purge);
 388
 389 static inline struct ip_map *
 390 ip_map_cached_get(struct svc_rqst *rqstp)
 391 {
 392         struct ip_map *ipm = NULL;
 393         struct svc_xprt *xprt = rqstp->rq_xprt;
 394
 395         if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
 396                 spin_lock(&xprt->xpt_lock);
 397                 ipm = xprt->xpt_auth_cache;
 398                 if (ipm != NULL) {
 399                         if (!cache_valid(&ipm->h)) {
 400                                 /*
 401                                  * The entry has been invalidated since it was
 402                                  * remembered, e.g. by a second mount from the
 403                                  * same IP address.
 404                                  */
 405                                 xprt->xpt_auth_cache = NULL;
 406                                 spin_unlock(&xprt->xpt_lock);
 407                                 cache_put(&ipm->h, &ip_map_cache);
 408                                 return NULL;
 409                         }
 410                         cache_get(&ipm->h);
 411                 }
 412                 spin_unlock(&xprt->xpt_lock);
 413         }
 414         return ipm;
 415 }
 416
 417 static inline void
 418 ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
 419 {
 420         struct svc_xprt *xprt = rqstp->rq_xprt;
 421
 422         if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
 423                 spin_lock(&xprt->xpt_lock);
 424                 if (xprt->xpt_auth_cache == NULL) {
 425                         /* newly cached, keep the reference */
 426                         xprt->xpt_auth_cache = ipm;
 427                         ipm = NULL;
 428                 }
 429                 spin_unlock(&xprt->xpt_lock);
 430         }
 431         if (ipm)
 432                 cache_put(&ipm->h, &ip_map_cache);
 433 }
 434
 435 void
 436 svcauth_unix_info_release(void *info)
 437 {
 438         struct ip_map *ipm = info;
 439         cache_put(&ipm->h, &ip_map_cache);
 440 }
 441
 442 /****************************************************************************
 443  * auth.unix.gid cache
 444  * simple cache to map a UID to a list of GIDs
 445  * because AUTH_UNIX aka AUTH_SYS has a max of 16
 446  */
 447 #define GID_HASHBITS    8
 448 #define GID_HASHMAX     (1<<GID_HASHBITS)
 449 #define GID_HASHMASK    (GID_HASHMAX - 1)
 450
 451 struct unix_gid {
 452         struct cache_head       h;
 453         uid_t                   uid;
 454         struct group_info       *gi;
 455 };
 456 static struct cache_head        *gid_table[GID_HASHMAX];
 457
 458 static void unix_gid_put(struct kref *kref)
 459 {
 460         struct cache_head *item = container_of(kref, struct cache_head, ref);
 461         struct unix_gid *ug = container_of(item, struct unix_gid, h);
 462         if (test_bit(CACHE_VALID, &item->flags) &&
 463             !test_bit(CACHE_NEGATIVE, &item->flags))
 464                 put_group_info(ug->gi);
 465         kfree(ug);
 466 }
 467
 468 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
 469 {
 470         struct unix_gid *orig = container_of(corig, struct unix_gid, h);
 471         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 472         return orig->uid == new->uid;
 473 }
 474 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
 475 {
 476         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 477         struct unix_gid *item = container_of(citem, struct unix_gid, h);
 478         new->uid = item->uid;
 479 }
 480 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
 481 {
 482         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 483         struct unix_gid *item = container_of(citem, struct unix_gid, h);
 484
 485         get_group_info(item->gi);
 486         new->gi = item->gi;
 487 }
 488 static struct cache_head *unix_gid_alloc(void)
 489 {
 490         struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
 491         if (g)
 492                 return &g->h;
 493         else
 494                 return NULL;
 495 }
 496
 497 static void unix_gid_request(struct cache_detail *cd,
 498                              struct cache_head *h,
 499                              char **bpp, int *blen)
 500 {
 501         char tuid[20];
 502         struct unix_gid *ug = container_of(h, struct unix_gid, h);
 503
 504         snprintf(tuid, 20, "%u", ug->uid);
 505         qword_add(bpp, blen, tuid);
 506         (*bpp)[-1] = '\n';
 507 }
 508
 509 static struct unix_gid *unix_gid_lookup(uid_t uid);
 510 extern struct cache_detail unix_gid_cache;
 511
 512 static int unix_gid_parse(struct cache_detail *cd,
 513                         char *mesg, int mlen)
 514 {
 515         /* uid expiry Ngid gid0 gid1 ... gidN-1 */
 516         int uid;
 517         int gids;
 518         int rv;
 519         int i;
 520         int err;
 521         time_t expiry;
 522         struct unix_gid ug, *ugp;
 523
 524         if (mlen <= 0 || mesg[mlen-1] != '\n')
 525                 return -EINVAL;
 526         mesg[mlen-1] = 0;
 527
 528         rv = get_int(&mesg, &uid);
 529         if (rv)
 530                 return -EINVAL;
 531         ug.uid = uid;
 532
 533         expiry = get_expiry(&mesg);
 534         if (expiry == 0)
 535                 return -EINVAL;
 536
 537         rv = get_int(&mesg, &gids);
 538         if (rv || gids < 0 || gids > 8192)
 539                 return -EINVAL;
 540
 541         ug.gi = groups_alloc(gids);
 542         if (!ug.gi)
 543                 return -ENOMEM;
 544
 545         for (i = 0 ; i < gids ; i++) {
 546                 int gid;
 547                 rv = get_int(&mesg, &gid);
 548                 err = -EINVAL;
 549                 if (rv)
 550                         goto out;
 551                 GROUP_AT(ug.gi, i) = gid;
 552         }
 553
 554         ugp = unix_gid_lookup(uid);
 555         if (ugp) {
 556                 struct cache_head *ch;
 557                 ug.h.flags = 0;
 558                 ug.h.expiry_time = expiry;
 559                 ch = sunrpc_cache_update(&unix_gid_cache,
 560                                          &ug.h, &ugp->h,
 561                                          hash_long(uid, GID_HASHBITS));
 562                 if (!ch)
 563                         err = -ENOMEM;
 564                 else {
 565                         err = 0;
 566                         cache_put(ch, &unix_gid_cache);
 567                 }
 568         } else
 569                 err = -ENOMEM;
 570  out:
 571         if (ug.gi)
 572                 put_group_info(ug.gi);
 573         return err;
 574 }
 575
 576 static int unix_gid_show(struct seq_file *m,
 577                          struct cache_detail *cd,
 578                          struct cache_head *h)
 579 {
 580         struct unix_gid *ug;
 581         int i;
 582         int glen;
 583
 584         if (h == NULL) {
 585                 seq_puts(m, "#uid cnt: gids...\n");
 586                 return 0;
 587         }
 588         ug = container_of(h, struct unix_gid, h);
 589         if (test_bit(CACHE_VALID, &h->flags) &&
 590             !test_bit(CACHE_NEGATIVE, &h->flags))
 591                 glen = ug->gi->ngroups;
 592         else
 593                 glen = 0;
 594
 595         seq_printf(m, "%d %d:", ug->uid, glen);
 596         for (i = 0; i < glen; i++)
 597                 seq_printf(m, " %d", GROUP_AT(ug->gi, i));
 598         seq_printf(m, "\n");
 599         return 0;
 600 }
 601
 602 struct cache_detail unix_gid_cache = {
 603         .owner          = THIS_MODULE,
 604         .hash_size      = GID_HASHMAX,
 605         .hash_table     = gid_table,
 606         .name           = "auth.unix.gid",
 607         .cache_put      = unix_gid_put,
 608         .cache_request  = unix_gid_request,
 609         .cache_parse    = unix_gid_parse,
 610         .cache_show     = unix_gid_show,
 611         .match          = unix_gid_match,
 612         .init           = unix_gid_init,
 613         .update         = unix_gid_update,
 614         .alloc          = unix_gid_alloc,
 615 };
 616
 617 static struct unix_gid *unix_gid_lookup(uid_t uid)
 618 {
 619         struct unix_gid ug;
 620         struct cache_head *ch;
 621
 622         ug.uid = uid;
 623         ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
 624                                  hash_long(uid, GID_HASHBITS));
 625         if (ch)
 626                 return container_of(ch, struct unix_gid, h);
 627         else
 628                 return NULL;
 629 }
 630
 631 static int unix_gid_find(uid_t uid, struct group_info **gip,
 632                          struct svc_rqst *rqstp)
 633 {
 634         struct unix_gid *ug = unix_gid_lookup(uid);
 635         if (!ug)
 636                 return -EAGAIN;
 637         switch (cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle)) {
 638         case -ENOENT:
 639                 *gip = NULL;
 640                 return 0;
 641         case 0:
 642                 *gip = ug->gi;
 643                 get_group_info(*gip);
 644                 return 0;
 645         default:
 646                 return -EAGAIN;
 647         }
 648 }
 649
 650 int
 651 svcauth_unix_set_client(struct svc_rqst *rqstp)
 652 {
 653         struct sockaddr_in *sin = svc_addr_in(rqstp);
 654         struct ip_map *ipm;
 655
 656         rqstp->rq_client = NULL;
 657         if (rqstp->rq_proc == 0)
 658                 return SVC_OK;
 659
 660         ipm = ip_map_cached_get(rqstp);
 661         if (ipm == NULL)
 662                 ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
 663                                     sin->sin_addr);
 664
 665         if (ipm == NULL)
 666                 return SVC_DENIED;
 667
 668         switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
 669                 default:
 670                         BUG();
 671                 case -EAGAIN:
 672                 case -ETIMEDOUT:
 673                         return SVC_DROP;
 674                 case -ENOENT:
 675                         return SVC_DENIED;
 676                 case 0:
 677                         rqstp->rq_client = &ipm->m_client->h;
 678                         kref_get(&rqstp->rq_client->ref);
 679                         ip_map_cached_put(rqstp, ipm);
 680                         break;
 681         }
 682         return SVC_OK;
 683 }
 684
 685 EXPORT_SYMBOL(svcauth_unix_set_client);
 686
 687 static int
 688 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
 689 {
 690         struct kvec     *argv = &rqstp->rq_arg.head[0];
 691         struct kvec     *resv = &rqstp->rq_res.head[0];
 692         struct svc_cred *cred = &rqstp->rq_cred;
 693
 694         cred->cr_group_info = NULL;
 695         rqstp->rq_client = NULL;
 696
 697         if (argv->iov_len < 3*4)
 698                 return SVC_GARBAGE;
 699
 700         if (svc_getu32(argv) != 0) {
 701                 dprintk("svc: bad null cred\n");
 702                 *authp = rpc_autherr_badcred;
 703                 return SVC_DENIED;
 704         }
 705         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
 706                 dprintk("svc: bad null verf\n");
 707                 *authp = rpc_autherr_badverf;
 708                 return SVC_DENIED;
 709         }
 710
 711         /* Signal that mapping to nobody uid/gid is required */
 712         cred->cr_uid = (uid_t) -1;
 713         cred->cr_gid = (gid_t) -1;
 714         cred->cr_group_info = groups_alloc(0);
 715         if (cred->cr_group_info == NULL)
 716                 return SVC_DROP; /* kmalloc failure - client must retry */
 717
 718         /* Put NULL verifier */
 719         svc_putnl(resv, RPC_AUTH_NULL);
 720         svc_putnl(resv, 0);
 721
 722         rqstp->rq_flavor = RPC_AUTH_NULL;
 723         return SVC_OK;
 724 }
 725
 726 static int
 727 svcauth_null_release(struct svc_rqst *rqstp)
 728 {
 729         if (rqstp->rq_client)
 730                 auth_domain_put(rqstp->rq_client);
 731         rqstp->rq_client = NULL;
 732         if (rqstp->rq_cred.cr_group_info)
 733                 put_group_info(rqstp->rq_cred.cr_group_info);
 734         rqstp->rq_cred.cr_group_info = NULL;
 735
 736         return 0; /* don't drop */
 737 }
 738
 739
 740 struct auth_ops svcauth_null = {
 741         .name           = "null",
 742         .owner          = THIS_MODULE,
 743         .flavour        = RPC_AUTH_NULL,
 744         .accept         = svcauth_null_accept,
 745         .release        = svcauth_null_release,
 746         .set_client     = svcauth_unix_set_client,
 747 };
 748
 749
 750 static int
 751 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
 752 {
 753         struct kvec     *argv = &rqstp->rq_arg.head[0];
 754         struct kvec     *resv = &rqstp->rq_res.head[0];
 755         struct svc_cred *cred = &rqstp->rq_cred;
 756         u32             slen, i;
 757         int             len   = argv->iov_len;
 758
 759         cred->cr_group_info = NULL;
 760         rqstp->rq_client = NULL;
 761
 762         if ((len -= 3*4) < 0)
 763                 return SVC_GARBAGE;
 764
 765         svc_getu32(argv);                       /* length */
 766         svc_getu32(argv);                       /* time stamp */
 767         slen = XDR_QUADLEN(svc_getnl(argv));    /* machname length */
 768         if (slen > 64 || (len -= (slen + 3)*4) < 0)
 769                 goto badcred;
 770         argv->iov_base = (void*)((__be32*)argv->iov_base + slen);       /* skip machname */
 771         argv->iov_len -= slen*4;
 772
 773         cred->cr_uid = svc_getnl(argv);         /* uid */
 774         cred->cr_gid = svc_getnl(argv);         /* gid */
 775         slen = svc_getnl(argv);                 /* gids length */
 776         if (slen > 16 || (len -= (slen + 2)*4) < 0)
 777                 goto badcred;
 778         if (unix_gid_find(cred->cr_uid, &cred->cr_group_info, rqstp)
 779             == -EAGAIN)
 780                 return SVC_DROP;
 781         if (cred->cr_group_info == NULL) {
 782                 cred->cr_group_info = groups_alloc(slen);
 783                 if (cred->cr_group_info == NULL)
 784                         return SVC_DROP;
 785                 for (i = 0; i < slen; i++)
 786                         GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
 787         } else {
 788                 for (i = 0; i < slen ; i++)
 789                         svc_getnl(argv);
 790         }
 791         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
 792                 *authp = rpc_autherr_badverf;
 793                 return SVC_DENIED;
 794         }
 795
 796         /* Put NULL verifier */
 797         svc_putnl(resv, RPC_AUTH_NULL);
 798         svc_putnl(resv, 0);
 799
 800         rqstp->rq_flavor = RPC_AUTH_UNIX;
 801         return SVC_OK;
 802
 803 badcred:
 804         *authp = rpc_autherr_badcred;
 805         return SVC_DENIED;
 806 }
 807
 808 static int
 809 svcauth_unix_release(struct svc_rqst *rqstp)
 810 {
 811         /* Verifier (such as it is) is already in place.
 812          */
 813         if (rqstp->rq_client)
 814                 auth_domain_put(rqstp->rq_client);
 815         rqstp->rq_client = NULL;
 816         if (rqstp->rq_cred.cr_group_info)
 817                 put_group_info(rqstp->rq_cred.cr_group_info);
 818         rqstp->rq_cred.cr_group_info = NULL;
 819
 820         return 0;
 821 }
 822
 823
 824 struct auth_ops svcauth_unix = {
 825         .name           = "unix",
 826         .owner          = THIS_MODULE,
 827         .flavour        = RPC_AUTH_UNIX,
 828         .accept         = svcauth_unix_accept,
 829         .release        = svcauth_unix_release,
 830         .domain_release = svcauth_unix_domain_release,
 831         .set_client     = svcauth_unix_set_client,
 832 };
 833