err.no Git - linux-2.6/blob - 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 #include <net/ipv6.h>
  15 #include <linux/kernel.h>
  16 #define RPCDBG_FACILITY RPCDBG_AUTH
  17
  18
  19 /*
  20  * AUTHUNIX and AUTHNULL credentials are both handled here.
  21  * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
  22  * are always nobody (-2).  i.e. we do the same IP address checks for
  23  * AUTHNULL as for AUTHUNIX, and that is done here.
  24  */
  25
  26
  27 struct unix_domain {
  28         struct auth_domain      h;
  29         int     addr_changes;
  30         /* other stuff later */
  31 };
  32
  33 extern struct auth_ops svcauth_unix;
  34
  35 struct auth_domain *unix_domain_find(char *name)
  36 {
  37         struct auth_domain *rv;
  38         struct unix_domain *new = NULL;
  39
  40         rv = auth_domain_lookup(name, NULL);
  41         while(1) {
  42                 if (rv) {
  43                         if (new && rv != &new->h)
  44                                 auth_domain_put(&new->h);
  45
  46                         if (rv->flavour != &svcauth_unix) {
  47                                 auth_domain_put(rv);
  48                                 return NULL;
  49                         }
  50                         return rv;
  51                 }
  52
  53                 new = kmalloc(sizeof(*new), GFP_KERNEL);
  54                 if (new == NULL)
  55                         return NULL;
  56                 kref_init(&new->h.ref);
  57                 new->h.name = kstrdup(name, GFP_KERNEL);
  58                 if (new->h.name == NULL) {
  59                         kfree(new);
  60                         return NULL;
  61                 }
  62                 new->h.flavour = &svcauth_unix;
  63                 new->addr_changes = 0;
  64                 rv = auth_domain_lookup(name, &new->h);
  65         }
  66 }
  67 EXPORT_SYMBOL(unix_domain_find);
  68
  69 static void svcauth_unix_domain_release(struct auth_domain *dom)
  70 {
  71         struct unix_domain *ud = container_of(dom, struct unix_domain, h);
  72
  73         kfree(dom->name);
  74         kfree(ud);
  75 }
  76
  77
  78 /**************************************************
  79  * cache for IP address to unix_domain
  80  * as needed by AUTH_UNIX
  81  */
  82 #define IP_HASHBITS     8
  83 #define IP_HASHMAX      (1<<IP_HASHBITS)
  84 #define IP_HASHMASK     (IP_HASHMAX-1)
  85
  86 struct ip_map {
  87         struct cache_head       h;
  88         char                    m_class[8]; /* e.g. "nfsd" */
  89         struct in6_addr         m_addr;
  90         struct unix_domain      *m_client;
  91         int                     m_add_change;
  92 };
  93 static struct cache_head        *ip_table[IP_HASHMAX];
  94
  95 static void ip_map_put(struct kref *kref)
  96 {
  97         struct cache_head *item = container_of(kref, struct cache_head, ref);
  98         struct ip_map *im = container_of(item, struct ip_map,h);
  99
 100         if (test_bit(CACHE_VALID, &item->flags) &&
 101             !test_bit(CACHE_NEGATIVE, &item->flags))
 102                 auth_domain_put(&im->m_client->h);
 103         kfree(im);
 104 }
 105
 106 #if IP_HASHBITS == 8
 107 /* hash_long on a 64 bit machine is currently REALLY BAD for
 108  * IP addresses in reverse-endian (i.e. on a little-endian machine).
 109  * So use a trivial but reliable hash instead
 110  */
 111 static inline int hash_ip(__be32 ip)
 112 {
 113         int hash = (__force u32)ip ^ ((__force u32)ip>>16);
 114         return (hash ^ (hash>>8)) & 0xff;
 115 }
 116 #endif
 117 static inline int hash_ip6(struct in6_addr ip)
 118 {
 119         return (hash_ip(ip.s6_addr32[0]) ^
 120                 hash_ip(ip.s6_addr32[1]) ^
 121                 hash_ip(ip.s6_addr32[2]) ^
 122                 hash_ip(ip.s6_addr32[3]));
 123 }
 124 static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
 125 {
 126         struct ip_map *orig = container_of(corig, struct ip_map, h);
 127         struct ip_map *new = container_of(cnew, struct ip_map, h);
 128         return strcmp(orig->m_class, new->m_class) == 0
 129                 && ipv6_addr_equal(&orig->m_addr, &new->m_addr);
 130 }
 131 static void ip_map_init(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         strcpy(new->m_class, item->m_class);
 137         ipv6_addr_copy(&new->m_addr, &item->m_addr);
 138 }
 139 static void update(struct cache_head *cnew, struct cache_head *citem)
 140 {
 141         struct ip_map *new = container_of(cnew, struct ip_map, h);
 142         struct ip_map *item = container_of(citem, struct ip_map, h);
 143
 144         kref_get(&item->m_client->h.ref);
 145         new->m_client = item->m_client;
 146         new->m_add_change = item->m_add_change;
 147 }
 148 static struct cache_head *ip_map_alloc(void)
 149 {
 150         struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
 151         if (i)
 152                 return &i->h;
 153         else
 154                 return NULL;
 155 }
 156
 157 static void ip_map_request(struct cache_detail *cd,
 158                                   struct cache_head *h,
 159                                   char **bpp, int *blen)
 160 {
 161         char text_addr[40];
 162         struct ip_map *im = container_of(h, struct ip_map, h);
 163
 164         if (ipv6_addr_v4mapped(&(im->m_addr))) {
 165                 snprintf(text_addr, 20, NIPQUAD_FMT,
 166                                 ntohl(im->m_addr.s6_addr32[3]) >> 24 & 0xff,
 167                                 ntohl(im->m_addr.s6_addr32[3]) >> 16 & 0xff,
 168                                 ntohl(im->m_addr.s6_addr32[3]) >>  8 & 0xff,
 169                                 ntohl(im->m_addr.s6_addr32[3]) >>  0 & 0xff);
 170         } else {
 171                 snprintf(text_addr, 40, NIP6_FMT, NIP6(im->m_addr));
 172         }
 173         qword_add(bpp, blen, im->m_class);
 174         qword_add(bpp, blen, text_addr);
 175         (*bpp)[-1] = '\n';
 176 }
 177
 178 static struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr);
 179 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
 180
 181 static int ip_map_parse(struct cache_detail *cd,
 182                           char *mesg, int mlen)
 183 {
 184         /* class ipaddress [domainname] */
 185         /* should be safe just to use the start of the input buffer
 186          * for scratch: */
 187         char *buf = mesg;
 188         int len;
 189         int b1, b2, b3, b4, b5, b6, b7, b8;
 190         char c;
 191         char class[8];
 192         struct in6_addr addr;
 193         int err;
 194
 195         struct ip_map *ipmp;
 196         struct auth_domain *dom;
 197         time_t expiry;
 198
 199         if (mesg[mlen-1] != '\n')
 200                 return -EINVAL;
 201         mesg[mlen-1] = 0;
 202
 203         /* class */
 204         len = qword_get(&mesg, class, sizeof(class));
 205         if (len <= 0) return -EINVAL;
 206
 207         /* ip address */
 208         len = qword_get(&mesg, buf, mlen);
 209         if (len <= 0) return -EINVAL;
 210
 211         if (sscanf(buf, NIPQUAD_FMT "%c", &b1, &b2, &b3, &b4, &c) == 4) {
 212                 addr.s6_addr32[0] = 0;
 213                 addr.s6_addr32[1] = 0;
 214                 addr.s6_addr32[2] = htonl(0xffff);
 215                 addr.s6_addr32[3] =
 216                         htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
 217        } else if (sscanf(buf, NIP6_FMT "%c",
 218                         &b1, &b2, &b3, &b4, &b5, &b6, &b7, &b8, &c) == 8) {
 219                 addr.s6_addr16[0] = htons(b1);
 220                 addr.s6_addr16[1] = htons(b2);
 221                 addr.s6_addr16[2] = htons(b3);
 222                 addr.s6_addr16[3] = htons(b4);
 223                 addr.s6_addr16[4] = htons(b5);
 224                 addr.s6_addr16[5] = htons(b6);
 225                 addr.s6_addr16[6] = htons(b7);
 226                 addr.s6_addr16[7] = htons(b8);
 227        } else
 228                 return -EINVAL;
 229
 230         expiry = get_expiry(&mesg);
 231         if (expiry ==0)
 232                 return -EINVAL;
 233
 234         /* domainname, or empty for NEGATIVE */
 235         len = qword_get(&mesg, buf, mlen);
 236         if (len < 0) return -EINVAL;
 237
 238         if (len) {
 239                 dom = unix_domain_find(buf);
 240                 if (dom == NULL)
 241                         return -ENOENT;
 242         } else
 243                 dom = NULL;
 244
 245         ipmp = ip_map_lookup(class, &addr);
 246         if (ipmp) {
 247                 err = ip_map_update(ipmp,
 248                              container_of(dom, struct unix_domain, h),
 249                              expiry);
 250         } else
 251                 err = -ENOMEM;
 252
 253         if (dom)
 254                 auth_domain_put(dom);
 255
 256         cache_flush();
 257         return err;
 258 }
 259
 260 static int ip_map_show(struct seq_file *m,
 261                        struct cache_detail *cd,
 262                        struct cache_head *h)
 263 {
 264         struct ip_map *im;
 265         struct in6_addr addr;
 266         char *dom = "-no-domain-";
 267
 268         if (h == NULL) {
 269                 seq_puts(m, "#class IP domain\n");
 270                 return 0;
 271         }
 272         im = container_of(h, struct ip_map, h);
 273         /* class addr domain */
 274         ipv6_addr_copy(&addr, &im->m_addr);
 275
 276         if (test_bit(CACHE_VALID, &h->flags) &&
 277             !test_bit(CACHE_NEGATIVE, &h->flags))
 278                 dom = im->m_client->h.name;
 279
 280         if (ipv6_addr_v4mapped(&addr)) {
 281                 seq_printf(m, "%s " NIPQUAD_FMT " %s\n",
 282                         im->m_class,
 283                         ntohl(addr.s6_addr32[3]) >> 24 & 0xff,
 284                         ntohl(addr.s6_addr32[3]) >> 16 & 0xff,
 285                         ntohl(addr.s6_addr32[3]) >>  8 & 0xff,
 286                         ntohl(addr.s6_addr32[3]) >>  0 & 0xff,
 287                         dom);
 288         } else {
 289                 seq_printf(m, "%s " NIP6_FMT " %s\n",
 290                         im->m_class, NIP6(addr), dom);
 291         }
 292         return 0;
 293 }
 294
 295
 296 struct cache_detail ip_map_cache = {
 297         .owner          = THIS_MODULE,
 298         .hash_size      = IP_HASHMAX,
 299         .hash_table     = ip_table,
 300         .name           = "auth.unix.ip",
 301         .cache_put      = ip_map_put,
 302         .cache_request  = ip_map_request,
 303         .cache_parse    = ip_map_parse,
 304         .cache_show     = ip_map_show,
 305         .match          = ip_map_match,
 306         .init           = ip_map_init,
 307         .update         = update,
 308         .alloc          = ip_map_alloc,
 309 };
 310
 311 static struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr)
 312 {
 313         struct ip_map ip;
 314         struct cache_head *ch;
 315
 316         strcpy(ip.m_class, class);
 317         ipv6_addr_copy(&ip.m_addr, addr);
 318         ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
 319                                  hash_str(class, IP_HASHBITS) ^
 320                                  hash_ip6(*addr));
 321
 322         if (ch)
 323                 return container_of(ch, struct ip_map, h);
 324         else
 325                 return NULL;
 326 }
 327
 328 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry)
 329 {
 330         struct ip_map ip;
 331         struct cache_head *ch;
 332
 333         ip.m_client = udom;
 334         ip.h.flags = 0;
 335         if (!udom)
 336                 set_bit(CACHE_NEGATIVE, &ip.h.flags);
 337         else {
 338                 ip.m_add_change = udom->addr_changes;
 339                 /* if this is from the legacy set_client system call,
 340                  * we need m_add_change to be one higher
 341                  */
 342                 if (expiry == NEVER)
 343                         ip.m_add_change++;
 344         }
 345         ip.h.expiry_time = expiry;
 346         ch = sunrpc_cache_update(&ip_map_cache,
 347                                  &ip.h, &ipm->h,
 348                                  hash_str(ipm->m_class, IP_HASHBITS) ^
 349                                  hash_ip6(ipm->m_addr));
 350         if (!ch)
 351                 return -ENOMEM;
 352         cache_put(ch, &ip_map_cache);
 353         return 0;
 354 }
 355
 356 int auth_unix_add_addr(struct in6_addr *addr, struct auth_domain *dom)
 357 {
 358         struct unix_domain *udom;
 359         struct ip_map *ipmp;
 360
 361         if (dom->flavour != &svcauth_unix)
 362                 return -EINVAL;
 363         udom = container_of(dom, struct unix_domain, h);
 364         ipmp = ip_map_lookup("nfsd", addr);
 365
 366         if (ipmp)
 367                 return ip_map_update(ipmp, udom, NEVER);
 368         else
 369                 return -ENOMEM;
 370 }
 371 EXPORT_SYMBOL(auth_unix_add_addr);
 372
 373 int auth_unix_forget_old(struct auth_domain *dom)
 374 {
 375         struct unix_domain *udom;
 376
 377         if (dom->flavour != &svcauth_unix)
 378                 return -EINVAL;
 379         udom = container_of(dom, struct unix_domain, h);
 380         udom->addr_changes++;
 381         return 0;
 382 }
 383 EXPORT_SYMBOL(auth_unix_forget_old);
 384
 385 struct auth_domain *auth_unix_lookup(struct in6_addr *addr)
 386 {
 387         struct ip_map *ipm;
 388         struct auth_domain *rv;
 389
 390         ipm = ip_map_lookup("nfsd", addr);
 391
 392         if (!ipm)
 393                 return NULL;
 394         if (cache_check(&ip_map_cache, &ipm->h, NULL))
 395                 return NULL;
 396
 397         if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
 398                 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
 399                         auth_domain_put(&ipm->m_client->h);
 400                 rv = NULL;
 401         } else {
 402                 rv = &ipm->m_client->h;
 403                 kref_get(&rv->ref);
 404         }
 405         cache_put(&ipm->h, &ip_map_cache);
 406         return rv;
 407 }
 408 EXPORT_SYMBOL(auth_unix_lookup);
 409
 410 void svcauth_unix_purge(void)
 411 {
 412         cache_purge(&ip_map_cache);
 413 }
 414 EXPORT_SYMBOL(svcauth_unix_purge);
 415
 416 static inline struct ip_map *
 417 ip_map_cached_get(struct svc_rqst *rqstp)
 418 {
 419         struct ip_map *ipm = NULL;
 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                 ipm = xprt->xpt_auth_cache;
 425                 if (ipm != NULL) {
 426                         if (!cache_valid(&ipm->h)) {
 427                                 /*
 428                                  * The entry has been invalidated since it was
 429                                  * remembered, e.g. by a second mount from the
 430                                  * same IP address.
 431                                  */
 432                                 xprt->xpt_auth_cache = NULL;
 433                                 spin_unlock(&xprt->xpt_lock);
 434                                 cache_put(&ipm->h, &ip_map_cache);
 435                                 return NULL;
 436                         }
 437                         cache_get(&ipm->h);
 438                 }
 439                 spin_unlock(&xprt->xpt_lock);
 440         }
 441         return ipm;
 442 }
 443
 444 static inline void
 445 ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
 446 {
 447         struct svc_xprt *xprt = rqstp->rq_xprt;
 448
 449         if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
 450                 spin_lock(&xprt->xpt_lock);
 451                 if (xprt->xpt_auth_cache == NULL) {
 452                         /* newly cached, keep the reference */
 453                         xprt->xpt_auth_cache = ipm;
 454                         ipm = NULL;
 455                 }
 456                 spin_unlock(&xprt->xpt_lock);
 457         }
 458         if (ipm)
 459                 cache_put(&ipm->h, &ip_map_cache);
 460 }
 461
 462 void
 463 svcauth_unix_info_release(void *info)
 464 {
 465         struct ip_map *ipm = info;
 466         cache_put(&ipm->h, &ip_map_cache);
 467 }
 468
 469 /****************************************************************************
 470  * auth.unix.gid cache
 471  * simple cache to map a UID to a list of GIDs
 472  * because AUTH_UNIX aka AUTH_SYS has a max of 16
 473  */
 474 #define GID_HASHBITS    8
 475 #define GID_HASHMAX     (1<<GID_HASHBITS)
 476 #define GID_HASHMASK    (GID_HASHMAX - 1)
 477
 478 struct unix_gid {
 479         struct cache_head       h;
 480         uid_t                   uid;
 481         struct group_info       *gi;
 482 };
 483 static struct cache_head        *gid_table[GID_HASHMAX];
 484
 485 static void unix_gid_put(struct kref *kref)
 486 {
 487         struct cache_head *item = container_of(kref, struct cache_head, ref);
 488         struct unix_gid *ug = container_of(item, struct unix_gid, h);
 489         if (test_bit(CACHE_VALID, &item->flags) &&
 490             !test_bit(CACHE_NEGATIVE, &item->flags))
 491                 put_group_info(ug->gi);
 492         kfree(ug);
 493 }
 494
 495 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
 496 {
 497         struct unix_gid *orig = container_of(corig, struct unix_gid, h);
 498         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 499         return orig->uid == new->uid;
 500 }
 501 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
 502 {
 503         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 504         struct unix_gid *item = container_of(citem, struct unix_gid, h);
 505         new->uid = item->uid;
 506 }
 507 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
 508 {
 509         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 510         struct unix_gid *item = container_of(citem, struct unix_gid, h);
 511
 512         get_group_info(item->gi);
 513         new->gi = item->gi;
 514 }
 515 static struct cache_head *unix_gid_alloc(void)
 516 {
 517         struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
 518         if (g)
 519                 return &g->h;
 520         else
 521                 return NULL;
 522 }
 523
 524 static void unix_gid_request(struct cache_detail *cd,
 525                              struct cache_head *h,
 526                              char **bpp, int *blen)
 527 {
 528         char tuid[20];
 529         struct unix_gid *ug = container_of(h, struct unix_gid, h);
 530
 531         snprintf(tuid, 20, "%u", ug->uid);
 532         qword_add(bpp, blen, tuid);
 533         (*bpp)[-1] = '\n';
 534 }
 535
 536 static struct unix_gid *unix_gid_lookup(uid_t uid);
 537 extern struct cache_detail unix_gid_cache;
 538
 539 static int unix_gid_parse(struct cache_detail *cd,
 540                         char *mesg, int mlen)
 541 {
 542         /* uid expiry Ngid gid0 gid1 ... gidN-1 */
 543         int uid;
 544         int gids;
 545         int rv;
 546         int i;
 547         int err;
 548         time_t expiry;
 549         struct unix_gid ug, *ugp;
 550
 551         if (mlen <= 0 || mesg[mlen-1] != '\n')
 552                 return -EINVAL;
 553         mesg[mlen-1] = 0;
 554
 555         rv = get_int(&mesg, &uid);
 556         if (rv)
 557                 return -EINVAL;
 558         ug.uid = uid;
 559
 560         expiry = get_expiry(&mesg);
 561         if (expiry == 0)
 562                 return -EINVAL;
 563
 564         rv = get_int(&mesg, &gids);
 565         if (rv || gids < 0 || gids > 8192)
 566                 return -EINVAL;
 567
 568         ug.gi = groups_alloc(gids);
 569         if (!ug.gi)
 570                 return -ENOMEM;
 571
 572         for (i = 0 ; i < gids ; i++) {
 573                 int gid;
 574                 rv = get_int(&mesg, &gid);
 575                 err = -EINVAL;
 576                 if (rv)
 577                         goto out;
 578                 GROUP_AT(ug.gi, i) = gid;
 579         }
 580
 581         ugp = unix_gid_lookup(uid);
 582         if (ugp) {
 583                 struct cache_head *ch;
 584                 ug.h.flags = 0;
 585                 ug.h.expiry_time = expiry;
 586                 ch = sunrpc_cache_update(&unix_gid_cache,
 587                                          &ug.h, &ugp->h,
 588                                          hash_long(uid, GID_HASHBITS));
 589                 if (!ch)
 590                         err = -ENOMEM;
 591                 else {
 592                         err = 0;
 593                         cache_put(ch, &unix_gid_cache);
 594                 }
 595         } else
 596                 err = -ENOMEM;
 597  out:
 598         if (ug.gi)
 599                 put_group_info(ug.gi);
 600         return err;
 601 }
 602
 603 static int unix_gid_show(struct seq_file *m,
 604                          struct cache_detail *cd,
 605                          struct cache_head *h)
 606 {
 607         struct unix_gid *ug;
 608         int i;
 609         int glen;
 610
 611         if (h == NULL) {
 612                 seq_puts(m, "#uid cnt: gids...\n");
 613                 return 0;
 614         }
 615         ug = container_of(h, struct unix_gid, h);
 616         if (test_bit(CACHE_VALID, &h->flags) &&
 617             !test_bit(CACHE_NEGATIVE, &h->flags))
 618                 glen = ug->gi->ngroups;
 619         else
 620                 glen = 0;
 621
 622         seq_printf(m, "%d %d:", ug->uid, glen);
 623         for (i = 0; i < glen; i++)
 624                 seq_printf(m, " %d", GROUP_AT(ug->gi, i));
 625         seq_printf(m, "\n");
 626         return 0;
 627 }
 628
 629 struct cache_detail unix_gid_cache = {
 630         .owner          = THIS_MODULE,
 631         .hash_size      = GID_HASHMAX,
 632         .hash_table     = gid_table,
 633         .name           = "auth.unix.gid",
 634         .cache_put      = unix_gid_put,
 635         .cache_request  = unix_gid_request,
 636         .cache_parse    = unix_gid_parse,
 637         .cache_show     = unix_gid_show,
 638         .match          = unix_gid_match,
 639         .init           = unix_gid_init,
 640         .update         = unix_gid_update,
 641         .alloc          = unix_gid_alloc,
 642 };
 643
 644 static struct unix_gid *unix_gid_lookup(uid_t uid)
 645 {
 646         struct unix_gid ug;
 647         struct cache_head *ch;
 648
 649         ug.uid = uid;
 650         ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
 651                                  hash_long(uid, GID_HASHBITS));
 652         if (ch)
 653                 return container_of(ch, struct unix_gid, h);
 654         else
 655                 return NULL;
 656 }
 657
 658 static int unix_gid_find(uid_t uid, struct group_info **gip,
 659                          struct svc_rqst *rqstp)
 660 {
 661         struct unix_gid *ug = unix_gid_lookup(uid);
 662         if (!ug)
 663                 return -EAGAIN;
 664         switch (cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle)) {
 665         case -ENOENT:
 666                 *gip = NULL;
 667                 return 0;
 668         case 0:
 669                 *gip = ug->gi;
 670                 get_group_info(*gip);
 671                 return 0;
 672         default:
 673                 return -EAGAIN;
 674         }
 675 }
 676
 677 int
 678 svcauth_unix_set_client(struct svc_rqst *rqstp)
 679 {
 680         struct sockaddr_in *sin;
 681         struct sockaddr_in6 *sin6, sin6_storage;
 682         struct ip_map *ipm;
 683
 684         switch (rqstp->rq_addr.ss_family) {
 685         case AF_INET:
 686                 sin = svc_addr_in(rqstp);
 687                 sin6 = &sin6_storage;
 688                 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
 689                                 htonl(0x0000FFFF), sin->sin_addr.s_addr);
 690                 break;
 691         case AF_INET6:
 692                 sin6 = svc_addr_in6(rqstp);
 693                 break;
 694         default:
 695                 BUG();
 696         }
 697
 698         rqstp->rq_client = NULL;
 699         if (rqstp->rq_proc == 0)
 700                 return SVC_OK;
 701
 702         ipm = ip_map_cached_get(rqstp);
 703         if (ipm == NULL)
 704                 ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
 705                                     &sin6->sin6_addr);
 706
 707         if (ipm == NULL)
 708                 return SVC_DENIED;
 709
 710         switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
 711                 default:
 712                         BUG();
 713                 case -EAGAIN:
 714                 case -ETIMEDOUT:
 715                         return SVC_DROP;
 716                 case -ENOENT:
 717                         return SVC_DENIED;
 718                 case 0:
 719                         rqstp->rq_client = &ipm->m_client->h;
 720                         kref_get(&rqstp->rq_client->ref);
 721                         ip_map_cached_put(rqstp, ipm);
 722                         break;
 723         }
 724         return SVC_OK;
 725 }
 726
 727 EXPORT_SYMBOL(svcauth_unix_set_client);
 728
 729 static int
 730 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
 731 {
 732         struct kvec     *argv = &rqstp->rq_arg.head[0];
 733         struct kvec     *resv = &rqstp->rq_res.head[0];
 734         struct svc_cred *cred = &rqstp->rq_cred;
 735
 736         cred->cr_group_info = NULL;
 737         rqstp->rq_client = NULL;
 738
 739         if (argv->iov_len < 3*4)
 740                 return SVC_GARBAGE;
 741
 742         if (svc_getu32(argv) != 0) {
 743                 dprintk("svc: bad null cred\n");
 744                 *authp = rpc_autherr_badcred;
 745                 return SVC_DENIED;
 746         }
 747         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
 748                 dprintk("svc: bad null verf\n");
 749                 *authp = rpc_autherr_badverf;
 750                 return SVC_DENIED;
 751         }
 752
 753         /* Signal that mapping to nobody uid/gid is required */
 754         cred->cr_uid = (uid_t) -1;
 755         cred->cr_gid = (gid_t) -1;
 756         cred->cr_group_info = groups_alloc(0);
 757         if (cred->cr_group_info == NULL)
 758                 return SVC_DROP; /* kmalloc failure - client must retry */
 759
 760         /* Put NULL verifier */
 761         svc_putnl(resv, RPC_AUTH_NULL);
 762         svc_putnl(resv, 0);
 763
 764         rqstp->rq_flavor = RPC_AUTH_NULL;
 765         return SVC_OK;
 766 }
 767
 768 static int
 769 svcauth_null_release(struct svc_rqst *rqstp)
 770 {
 771         if (rqstp->rq_client)
 772                 auth_domain_put(rqstp->rq_client);
 773         rqstp->rq_client = NULL;
 774         if (rqstp->rq_cred.cr_group_info)
 775                 put_group_info(rqstp->rq_cred.cr_group_info);
 776         rqstp->rq_cred.cr_group_info = NULL;
 777
 778         return 0; /* don't drop */
 779 }
 780
 781
 782 struct auth_ops svcauth_null = {
 783         .name           = "null",
 784         .owner          = THIS_MODULE,
 785         .flavour        = RPC_AUTH_NULL,
 786         .accept         = svcauth_null_accept,
 787         .release        = svcauth_null_release,
 788         .set_client     = svcauth_unix_set_client,
 789 };
 790
 791
 792 static int
 793 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
 794 {
 795         struct kvec     *argv = &rqstp->rq_arg.head[0];
 796         struct kvec     *resv = &rqstp->rq_res.head[0];
 797         struct svc_cred *cred = &rqstp->rq_cred;
 798         u32             slen, i;
 799         int             len   = argv->iov_len;
 800
 801         cred->cr_group_info = NULL;
 802         rqstp->rq_client = NULL;
 803
 804         if ((len -= 3*4) < 0)
 805                 return SVC_GARBAGE;
 806
 807         svc_getu32(argv);                       /* length */
 808         svc_getu32(argv);                       /* time stamp */
 809         slen = XDR_QUADLEN(svc_getnl(argv));    /* machname length */
 810         if (slen > 64 || (len -= (slen + 3)*4) < 0)
 811                 goto badcred;
 812         argv->iov_base = (void*)((__be32*)argv->iov_base + slen);       /* skip machname */
 813         argv->iov_len -= slen*4;
 814
 815         cred->cr_uid = svc_getnl(argv);         /* uid */
 816         cred->cr_gid = svc_getnl(argv);         /* gid */
 817         slen = svc_getnl(argv);                 /* gids length */
 818         if (slen > 16 || (len -= (slen + 2)*4) < 0)
 819                 goto badcred;
 820         if (unix_gid_find(cred->cr_uid, &cred->cr_group_info, rqstp)
 821             == -EAGAIN)
 822                 return SVC_DROP;
 823         if (cred->cr_group_info == NULL) {
 824                 cred->cr_group_info = groups_alloc(slen);
 825                 if (cred->cr_group_info == NULL)
 826                         return SVC_DROP;
 827                 for (i = 0; i < slen; i++)
 828                         GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
 829         } else {
 830                 for (i = 0; i < slen ; i++)
 831                         svc_getnl(argv);
 832         }
 833         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
 834                 *authp = rpc_autherr_badverf;
 835                 return SVC_DENIED;
 836         }
 837
 838         /* Put NULL verifier */
 839         svc_putnl(resv, RPC_AUTH_NULL);
 840         svc_putnl(resv, 0);
 841
 842         rqstp->rq_flavor = RPC_AUTH_UNIX;
 843         return SVC_OK;
 844
 845 badcred:
 846         *authp = rpc_autherr_badcred;
 847         return SVC_DENIED;
 848 }
 849
 850 static int
 851 svcauth_unix_release(struct svc_rqst *rqstp)
 852 {
 853         /* Verifier (such as it is) is already in place.
 854          */
 855         if (rqstp->rq_client)
 856                 auth_domain_put(rqstp->rq_client);
 857         rqstp->rq_client = NULL;
 858         if (rqstp->rq_cred.cr_group_info)
 859                 put_group_info(rqstp->rq_cred.cr_group_info);
 860         rqstp->rq_cred.cr_group_info = NULL;
 861
 862         return 0;
 863 }
 864
 865
 866 struct auth_ops svcauth_unix = {
 867         .name           = "unix",
 868         .owner          = THIS_MODULE,
 869         .flavour        = RPC_AUTH_UNIX,
 870         .accept         = svcauth_unix_accept,
 871         .release        = svcauth_unix_release,
 872         .domain_release = svcauth_unix_domain_release,
 873         .set_client     = svcauth_unix_set_client,
 874 };
 875