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 <linux/slab.h>
  14 #include <net/sock.h>
  15 #include <net/ipv6.h>
  16 #include <linux/kernel.h>
  17 #define RPCDBG_FACILITY RPCDBG_AUTH
  18
  19 #include <linux/sunrpc/clnt.h>
  20
  21 /*
  22  * AUTHUNIX and AUTHNULL credentials are both handled here.
  23  * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
  24  * are always nobody (-2).  i.e. we do the same IP address checks for
  25  * AUTHNULL as for AUTHUNIX, and that is done here.
  26  */
  27
  28
  29 struct unix_domain {
  30         struct auth_domain      h;
  31         int     addr_changes;
  32         /* other stuff later */
  33 };
  34
  35 extern struct auth_ops svcauth_unix;
  36
  37 struct auth_domain *unix_domain_find(char *name)
  38 {
  39         struct auth_domain *rv;
  40         struct unix_domain *new = NULL;
  41
  42         rv = auth_domain_lookup(name, NULL);
  43         while(1) {
  44                 if (rv) {
  45                         if (new && rv != &new->h)
  46                                 auth_domain_put(&new->h);
  47
  48                         if (rv->flavour != &svcauth_unix) {
  49                                 auth_domain_put(rv);
  50                                 return NULL;
  51                         }
  52                         return rv;
  53                 }
  54
  55                 new = kmalloc(sizeof(*new), GFP_KERNEL);
  56                 if (new == NULL)
  57                         return NULL;
  58                 kref_init(&new->h.ref);
  59                 new->h.name = kstrdup(name, GFP_KERNEL);
  60                 if (new->h.name == NULL) {
  61                         kfree(new);
  62                         return NULL;
  63                 }
  64                 new->h.flavour = &svcauth_unix;
  65                 new->addr_changes = 0;
  66                 rv = auth_domain_lookup(name, &new->h);
  67         }
  68 }
  69 EXPORT_SYMBOL_GPL(unix_domain_find);
  70
  71 static void svcauth_unix_domain_release(struct auth_domain *dom)
  72 {
  73         struct unix_domain *ud = container_of(dom, struct unix_domain, h);
  74
  75         kfree(dom->name);
  76         kfree(ud);
  77 }
  78
  79
  80 /**************************************************
  81  * cache for IP address to unix_domain
  82  * as needed by AUTH_UNIX
  83  */
  84 #define IP_HASHBITS     8
  85 #define IP_HASHMAX      (1<<IP_HASHBITS)
  86 #define IP_HASHMASK     (IP_HASHMAX-1)
  87
  88 struct ip_map {
  89         struct cache_head       h;
  90         char                    m_class[8]; /* e.g. "nfsd" */
  91         struct in6_addr         m_addr;
  92         struct unix_domain      *m_client;
  93         int                     m_add_change;
  94 };
  95 static struct cache_head        *ip_table[IP_HASHMAX];
  96
  97 static void ip_map_put(struct kref *kref)
  98 {
  99         struct cache_head *item = container_of(kref, struct cache_head, ref);
 100         struct ip_map *im = container_of(item, struct ip_map,h);
 101
 102         if (test_bit(CACHE_VALID, &item->flags) &&
 103             !test_bit(CACHE_NEGATIVE, &item->flags))
 104                 auth_domain_put(&im->m_client->h);
 105         kfree(im);
 106 }
 107
 108 #if IP_HASHBITS == 8
 109 /* hash_long on a 64 bit machine is currently REALLY BAD for
 110  * IP addresses in reverse-endian (i.e. on a little-endian machine).
 111  * So use a trivial but reliable hash instead
 112  */
 113 static inline int hash_ip(__be32 ip)
 114 {
 115         int hash = (__force u32)ip ^ ((__force u32)ip>>16);
 116         return (hash ^ (hash>>8)) & 0xff;
 117 }
 118 #endif
 119 static inline int hash_ip6(struct in6_addr ip)
 120 {
 121         return (hash_ip(ip.s6_addr32[0]) ^
 122                 hash_ip(ip.s6_addr32[1]) ^
 123                 hash_ip(ip.s6_addr32[2]) ^
 124                 hash_ip(ip.s6_addr32[3]));
 125 }
 126 static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
 127 {
 128         struct ip_map *orig = container_of(corig, struct ip_map, h);
 129         struct ip_map *new = container_of(cnew, struct ip_map, h);
 130         return strcmp(orig->m_class, new->m_class) == 0 &&
 131                ipv6_addr_equal(&orig->m_addr, &new->m_addr);
 132 }
 133 static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
 134 {
 135         struct ip_map *new = container_of(cnew, struct ip_map, h);
 136         struct ip_map *item = container_of(citem, struct ip_map, h);
 137
 138         strcpy(new->m_class, item->m_class);
 139         ipv6_addr_copy(&new->m_addr, &item->m_addr);
 140 }
 141 static void update(struct cache_head *cnew, struct cache_head *citem)
 142 {
 143         struct ip_map *new = container_of(cnew, struct ip_map, h);
 144         struct ip_map *item = container_of(citem, struct ip_map, h);
 145
 146         kref_get(&item->m_client->h.ref);
 147         new->m_client = item->m_client;
 148         new->m_add_change = item->m_add_change;
 149 }
 150 static struct cache_head *ip_map_alloc(void)
 151 {
 152         struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
 153         if (i)
 154                 return &i->h;
 155         else
 156                 return NULL;
 157 }
 158
 159 static void ip_map_request(struct cache_detail *cd,
 160                                   struct cache_head *h,
 161                                   char **bpp, int *blen)
 162 {
 163         char text_addr[40];
 164         struct ip_map *im = container_of(h, struct ip_map, h);
 165
 166         if (ipv6_addr_v4mapped(&(im->m_addr))) {
 167                 snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
 168         } else {
 169                 snprintf(text_addr, 40, "%pI6", &im->m_addr);
 170         }
 171         qword_add(bpp, blen, im->m_class);
 172         qword_add(bpp, blen, text_addr);
 173         (*bpp)[-1] = '\n';
 174 }
 175
 176 static int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
 177 {
 178         return sunrpc_cache_pipe_upcall(cd, h, ip_map_request);
 179 }
 180
 181 static struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr);
 182 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
 183
 184 static int ip_map_parse(struct cache_detail *cd,
 185                           char *mesg, int mlen)
 186 {
 187         /* class ipaddress [domainname] */
 188         /* should be safe just to use the start of the input buffer
 189          * for scratch: */
 190         char *buf = mesg;
 191         int len;
 192         char class[8];
 193         union {
 194                 struct sockaddr         sa;
 195                 struct sockaddr_in      s4;
 196                 struct sockaddr_in6     s6;
 197         } address;
 198         struct sockaddr_in6 sin6;
 199         int err;
 200
 201         struct ip_map *ipmp;
 202         struct auth_domain *dom;
 203         time_t expiry;
 204
 205         if (mesg[mlen-1] != '\n')
 206                 return -EINVAL;
 207         mesg[mlen-1] = 0;
 208
 209         /* class */
 210         len = qword_get(&mesg, class, sizeof(class));
 211         if (len <= 0) return -EINVAL;
 212
 213         /* ip address */
 214         len = qword_get(&mesg, buf, mlen);
 215         if (len <= 0) return -EINVAL;
 216
 217         if (rpc_pton(buf, len, &address.sa, sizeof(address)) == 0)
 218                 return -EINVAL;
 219         switch (address.sa.sa_family) {
 220         case AF_INET:
 221                 /* Form a mapped IPv4 address in sin6 */
 222                 memset(&sin6, 0, sizeof(sin6));
 223                 sin6.sin6_family = AF_INET6;
 224                 sin6.sin6_addr.s6_addr32[2] = htonl(0xffff);
 225                 sin6.sin6_addr.s6_addr32[3] = address.s4.sin_addr.s_addr;
 226                 break;
 227 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 228         case AF_INET6:
 229                 memcpy(&sin6, &address.s6, sizeof(sin6));
 230                 break;
 231 #endif
 232         default:
 233                 return -EINVAL;
 234         }
 235
 236         expiry = get_expiry(&mesg);
 237         if (expiry ==0)
 238                 return -EINVAL;
 239
 240         /* domainname, or empty for NEGATIVE */
 241         len = qword_get(&mesg, buf, mlen);
 242         if (len < 0) return -EINVAL;
 243
 244         if (len) {
 245                 dom = unix_domain_find(buf);
 246                 if (dom == NULL)
 247                         return -ENOENT;
 248         } else
 249                 dom = NULL;
 250
 251         /* IPv6 scope IDs are ignored for now */
 252         ipmp = ip_map_lookup(class, &sin6.sin6_addr);
 253         if (ipmp) {
 254                 err = ip_map_update(ipmp,
 255                              container_of(dom, struct unix_domain, h),
 256                              expiry);
 257         } else
 258                 err = -ENOMEM;
 259
 260         if (dom)
 261                 auth_domain_put(dom);
 262
 263         cache_flush();
 264         return err;
 265 }
 266
 267 static int ip_map_show(struct seq_file *m,
 268                        struct cache_detail *cd,
 269                        struct cache_head *h)
 270 {
 271         struct ip_map *im;
 272         struct in6_addr addr;
 273         char *dom = "-no-domain-";
 274
 275         if (h == NULL) {
 276                 seq_puts(m, "#class IP domain\n");
 277                 return 0;
 278         }
 279         im = container_of(h, struct ip_map, h);
 280         /* class addr domain */
 281         ipv6_addr_copy(&addr, &im->m_addr);
 282
 283         if (test_bit(CACHE_VALID, &h->flags) &&
 284             !test_bit(CACHE_NEGATIVE, &h->flags))
 285                 dom = im->m_client->h.name;
 286
 287         if (ipv6_addr_v4mapped(&addr)) {
 288                 seq_printf(m, "%s %pI4 %s\n",
 289                         im->m_class, &addr.s6_addr32[3], dom);
 290         } else {
 291                 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
 292         }
 293         return 0;
 294 }
 295
 296
 297 struct cache_detail ip_map_cache = {
 298         .owner          = THIS_MODULE,
 299         .hash_size      = IP_HASHMAX,
 300         .hash_table     = ip_table,
 301         .name           = "auth.unix.ip",
 302         .cache_put      = ip_map_put,
 303         .cache_upcall   = ip_map_upcall,
 304         .cache_parse    = ip_map_parse,
 305         .cache_show     = ip_map_show,
 306         .match          = ip_map_match,
 307         .init           = ip_map_init,
 308         .update         = update,
 309         .alloc          = ip_map_alloc,
 310 };
 311
 312 static struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr)
 313 {
 314         struct ip_map ip;
 315         struct cache_head *ch;
 316
 317         strcpy(ip.m_class, class);
 318         ipv6_addr_copy(&ip.m_addr, addr);
 319         ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
 320                                  hash_str(class, IP_HASHBITS) ^
 321                                  hash_ip6(*addr));
 322
 323         if (ch)
 324                 return container_of(ch, struct ip_map, h);
 325         else
 326                 return NULL;
 327 }
 328
 329 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry)
 330 {
 331         struct ip_map ip;
 332         struct cache_head *ch;
 333
 334         ip.m_client = udom;
 335         ip.h.flags = 0;
 336         if (!udom)
 337                 set_bit(CACHE_NEGATIVE, &ip.h.flags);
 338         else {
 339                 ip.m_add_change = udom->addr_changes;
 340                 /* if this is from the legacy set_client system call,
 341                  * we need m_add_change to be one higher
 342                  */
 343                 if (expiry == NEVER)
 344                         ip.m_add_change++;
 345         }
 346         ip.h.expiry_time = expiry;
 347         ch = sunrpc_cache_update(&ip_map_cache,
 348                                  &ip.h, &ipm->h,
 349                                  hash_str(ipm->m_class, IP_HASHBITS) ^
 350                                  hash_ip6(ipm->m_addr));
 351         if (!ch)
 352                 return -ENOMEM;
 353         cache_put(ch, &ip_map_cache);
 354         return 0;
 355 }
 356
 357 int auth_unix_add_addr(struct in6_addr *addr, struct auth_domain *dom)
 358 {
 359         struct unix_domain *udom;
 360         struct ip_map *ipmp;
 361
 362         if (dom->flavour != &svcauth_unix)
 363                 return -EINVAL;
 364         udom = container_of(dom, struct unix_domain, h);
 365         ipmp = ip_map_lookup("nfsd", addr);
 366
 367         if (ipmp)
 368                 return ip_map_update(ipmp, udom, NEVER);
 369         else
 370                 return -ENOMEM;
 371 }
 372 EXPORT_SYMBOL_GPL(auth_unix_add_addr);
 373
 374 int auth_unix_forget_old(struct auth_domain *dom)
 375 {
 376         struct unix_domain *udom;
 377
 378         if (dom->flavour != &svcauth_unix)
 379                 return -EINVAL;
 380         udom = container_of(dom, struct unix_domain, h);
 381         udom->addr_changes++;
 382         return 0;
 383 }
 384 EXPORT_SYMBOL_GPL(auth_unix_forget_old);
 385
 386 struct auth_domain *auth_unix_lookup(struct in6_addr *addr)
 387 {
 388         struct ip_map *ipm;
 389         struct auth_domain *rv;
 390
 391         ipm = ip_map_lookup("nfsd", addr);
 392
 393         if (!ipm)
 394                 return NULL;
 395         if (cache_check(&ip_map_cache, &ipm->h, NULL))
 396                 return NULL;
 397
 398         if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
 399                 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
 400                         auth_domain_put(&ipm->m_client->h);
 401                 rv = NULL;
 402         } else {
 403                 rv = &ipm->m_client->h;
 404                 kref_get(&rv->ref);
 405         }
 406         cache_put(&ipm->h, &ip_map_cache);
 407         return rv;
 408 }
 409 EXPORT_SYMBOL_GPL(auth_unix_lookup);
 410
 411 void svcauth_unix_purge(void)
 412 {
 413         cache_purge(&ip_map_cache);
 414 }
 415 EXPORT_SYMBOL_GPL(svcauth_unix_purge);
 416
 417 static inline struct ip_map *
 418 ip_map_cached_get(struct svc_rqst *rqstp)
 419 {
 420         struct ip_map *ipm = NULL;
 421         struct svc_xprt *xprt = rqstp->rq_xprt;
 422
 423         if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
 424                 spin_lock(&xprt->xpt_lock);
 425                 ipm = xprt->xpt_auth_cache;
 426                 if (ipm != NULL) {
 427                         if (!cache_valid(&ipm->h)) {
 428                                 /*
 429                                  * The entry has been invalidated since it was
 430                                  * remembered, e.g. by a second mount from the
 431                                  * same IP address.
 432                                  */
 433                                 xprt->xpt_auth_cache = NULL;
 434                                 spin_unlock(&xprt->xpt_lock);
 435                                 cache_put(&ipm->h, &ip_map_cache);
 436                                 return NULL;
 437                         }
 438                         cache_get(&ipm->h);
 439                 }
 440                 spin_unlock(&xprt->xpt_lock);
 441         }
 442         return ipm;
 443 }
 444
 445 static inline void
 446 ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
 447 {
 448         struct svc_xprt *xprt = rqstp->rq_xprt;
 449
 450         if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
 451                 spin_lock(&xprt->xpt_lock);
 452                 if (xprt->xpt_auth_cache == NULL) {
 453                         /* newly cached, keep the reference */
 454                         xprt->xpt_auth_cache = ipm;
 455                         ipm = NULL;
 456                 }
 457                 spin_unlock(&xprt->xpt_lock);
 458         }
 459         if (ipm)
 460                 cache_put(&ipm->h, &ip_map_cache);
 461 }
 462
 463 void
 464 svcauth_unix_info_release(void *info)
 465 {
 466         struct ip_map *ipm = info;
 467         cache_put(&ipm->h, &ip_map_cache);
 468 }
 469
 470 /****************************************************************************
 471  * auth.unix.gid cache
 472  * simple cache to map a UID to a list of GIDs
 473  * because AUTH_UNIX aka AUTH_SYS has a max of 16
 474  */
 475 #define GID_HASHBITS    8
 476 #define GID_HASHMAX     (1<<GID_HASHBITS)
 477 #define GID_HASHMASK    (GID_HASHMAX - 1)
 478
 479 struct unix_gid {
 480         struct cache_head       h;
 481         uid_t                   uid;
 482         struct group_info       *gi;
 483 };
 484 static struct cache_head        *gid_table[GID_HASHMAX];
 485
 486 static void unix_gid_put(struct kref *kref)
 487 {
 488         struct cache_head *item = container_of(kref, struct cache_head, ref);
 489         struct unix_gid *ug = container_of(item, struct unix_gid, h);
 490         if (test_bit(CACHE_VALID, &item->flags) &&
 491             !test_bit(CACHE_NEGATIVE, &item->flags))
 492                 put_group_info(ug->gi);
 493         kfree(ug);
 494 }
 495
 496 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
 497 {
 498         struct unix_gid *orig = container_of(corig, struct unix_gid, h);
 499         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 500         return orig->uid == new->uid;
 501 }
 502 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
 503 {
 504         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 505         struct unix_gid *item = container_of(citem, struct unix_gid, h);
 506         new->uid = item->uid;
 507 }
 508 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
 509 {
 510         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 511         struct unix_gid *item = container_of(citem, struct unix_gid, h);
 512
 513         get_group_info(item->gi);
 514         new->gi = item->gi;
 515 }
 516 static struct cache_head *unix_gid_alloc(void)
 517 {
 518         struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
 519         if (g)
 520                 return &g->h;
 521         else
 522                 return NULL;
 523 }
 524
 525 static void unix_gid_request(struct cache_detail *cd,
 526                              struct cache_head *h,
 527                              char **bpp, int *blen)
 528 {
 529         char tuid[20];
 530         struct unix_gid *ug = container_of(h, struct unix_gid, h);
 531
 532         snprintf(tuid, 20, "%u", ug->uid);
 533         qword_add(bpp, blen, tuid);
 534         (*bpp)[-1] = '\n';
 535 }
 536
 537 static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
 538 {
 539         return sunrpc_cache_pipe_upcall(cd, h, unix_gid_request);
 540 }
 541
 542 static struct unix_gid *unix_gid_lookup(uid_t uid);
 543 extern struct cache_detail unix_gid_cache;
 544
 545 static int unix_gid_parse(struct cache_detail *cd,
 546                         char *mesg, int mlen)
 547 {
 548         /* uid expiry Ngid gid0 gid1 ... gidN-1 */
 549         int uid;
 550         int gids;
 551         int rv;
 552         int i;
 553         int err;
 554         time_t expiry;
 555         struct unix_gid ug, *ugp;
 556
 557         if (mlen <= 0 || mesg[mlen-1] != '\n')
 558                 return -EINVAL;
 559         mesg[mlen-1] = 0;
 560
 561         rv = get_int(&mesg, &uid);
 562         if (rv)
 563                 return -EINVAL;
 564         ug.uid = uid;
 565
 566         expiry = get_expiry(&mesg);
 567         if (expiry == 0)
 568                 return -EINVAL;
 569
 570         rv = get_int(&mesg, &gids);
 571         if (rv || gids < 0 || gids > 8192)
 572                 return -EINVAL;
 573
 574         ug.gi = groups_alloc(gids);
 575         if (!ug.gi)
 576                 return -ENOMEM;
 577
 578         for (i = 0 ; i < gids ; i++) {
 579                 int gid;
 580                 rv = get_int(&mesg, &gid);
 581                 err = -EINVAL;
 582                 if (rv)
 583                         goto out;
 584                 GROUP_AT(ug.gi, i) = gid;
 585         }
 586
 587         ugp = unix_gid_lookup(uid);
 588         if (ugp) {
 589                 struct cache_head *ch;
 590                 ug.h.flags = 0;
 591                 ug.h.expiry_time = expiry;
 592                 ch = sunrpc_cache_update(&unix_gid_cache,
 593                                          &ug.h, &ugp->h,
 594                                          hash_long(uid, GID_HASHBITS));
 595                 if (!ch)
 596                         err = -ENOMEM;
 597                 else {
 598                         err = 0;
 599                         cache_put(ch, &unix_gid_cache);
 600                 }
 601         } else
 602                 err = -ENOMEM;
 603  out:
 604         if (ug.gi)
 605                 put_group_info(ug.gi);
 606         return err;
 607 }
 608
 609 static int unix_gid_show(struct seq_file *m,
 610                          struct cache_detail *cd,
 611                          struct cache_head *h)
 612 {
 613         struct unix_gid *ug;
 614         int i;
 615         int glen;
 616
 617         if (h == NULL) {
 618                 seq_puts(m, "#uid cnt: gids...\n");
 619                 return 0;
 620         }
 621         ug = container_of(h, struct unix_gid, h);
 622         if (test_bit(CACHE_VALID, &h->flags) &&
 623             !test_bit(CACHE_NEGATIVE, &h->flags))
 624                 glen = ug->gi->ngroups;
 625         else
 626                 glen = 0;
 627
 628         seq_printf(m, "%u %d:", ug->uid, glen);
 629         for (i = 0; i < glen; i++)
 630                 seq_printf(m, " %d", GROUP_AT(ug->gi, i));
 631         seq_printf(m, "\n");
 632         return 0;
 633 }
 634
 635 struct cache_detail unix_gid_cache = {
 636         .owner          = THIS_MODULE,
 637         .hash_size      = GID_HASHMAX,
 638         .hash_table     = gid_table,
 639         .name           = "auth.unix.gid",
 640         .cache_put      = unix_gid_put,
 641         .cache_upcall   = unix_gid_upcall,
 642         .cache_parse    = unix_gid_parse,
 643         .cache_show     = unix_gid_show,
 644         .match          = unix_gid_match,
 645         .init           = unix_gid_init,
 646         .update         = unix_gid_update,
 647         .alloc          = unix_gid_alloc,
 648 };
 649
 650 static struct unix_gid *unix_gid_lookup(uid_t uid)
 651 {
 652         struct unix_gid ug;
 653         struct cache_head *ch;
 654
 655         ug.uid = uid;
 656         ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
 657                                  hash_long(uid, GID_HASHBITS));
 658         if (ch)
 659                 return container_of(ch, struct unix_gid, h);
 660         else
 661                 return NULL;
 662 }
 663
 664 static struct group_info *unix_gid_find(uid_t uid, struct svc_rqst *rqstp)
 665 {
 666         struct unix_gid *ug;
 667         struct group_info *gi;
 668         int ret;
 669
 670         ug = unix_gid_lookup(uid);
 671         if (!ug)
 672                 return ERR_PTR(-EAGAIN);
 673         ret = cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle);
 674         switch (ret) {
 675         case -ENOENT:
 676                 return ERR_PTR(-ENOENT);
 677         case 0:
 678                 gi = get_group_info(ug->gi);
 679                 cache_put(&ug->h, &unix_gid_cache);
 680                 return gi;
 681         default:
 682                 return ERR_PTR(-EAGAIN);
 683         }
 684 }
 685
 686 int
 687 svcauth_unix_set_client(struct svc_rqst *rqstp)
 688 {
 689         struct sockaddr_in *sin;
 690         struct sockaddr_in6 *sin6, sin6_storage;
 691         struct ip_map *ipm;
 692         struct group_info *gi;
 693         struct svc_cred *cred = &rqstp->rq_cred;
 694
 695         switch (rqstp->rq_addr.ss_family) {
 696         case AF_INET:
 697                 sin = svc_addr_in(rqstp);
 698                 sin6 = &sin6_storage;
 699                 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
 700                 break;
 701         case AF_INET6:
 702                 sin6 = svc_addr_in6(rqstp);
 703                 break;
 704         default:
 705                 BUG();
 706         }
 707
 708         rqstp->rq_client = NULL;
 709         if (rqstp->rq_proc == 0)
 710                 return SVC_OK;
 711
 712         ipm = ip_map_cached_get(rqstp);
 713         if (ipm == NULL)
 714                 ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
 715                                     &sin6->sin6_addr);
 716
 717         if (ipm == NULL)
 718                 return SVC_DENIED;
 719
 720         switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
 721                 default:
 722                         BUG();
 723                 case -EAGAIN:
 724                 case -ETIMEDOUT:
 725                         return SVC_DROP;
 726                 case -ENOENT:
 727                         return SVC_DENIED;
 728                 case 0:
 729                         rqstp->rq_client = &ipm->m_client->h;
 730                         kref_get(&rqstp->rq_client->ref);
 731                         ip_map_cached_put(rqstp, ipm);
 732                         break;
 733         }
 734
 735         gi = unix_gid_find(cred->cr_uid, rqstp);
 736         switch (PTR_ERR(gi)) {
 737         case -EAGAIN:
 738                 return SVC_DROP;
 739         case -ENOENT:
 740                 break;
 741         default:
 742                 put_group_info(cred->cr_group_info);
 743                 cred->cr_group_info = gi;
 744         }
 745         return SVC_OK;
 746 }
 747
 748 EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
 749
 750 static int
 751 svcauth_null_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
 757         cred->cr_group_info = NULL;
 758         rqstp->rq_client = NULL;
 759
 760         if (argv->iov_len < 3*4)
 761                 return SVC_GARBAGE;
 762
 763         if (svc_getu32(argv) != 0) {
 764                 dprintk("svc: bad null cred\n");
 765                 *authp = rpc_autherr_badcred;
 766                 return SVC_DENIED;
 767         }
 768         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
 769                 dprintk("svc: bad null verf\n");
 770                 *authp = rpc_autherr_badverf;
 771                 return SVC_DENIED;
 772         }
 773
 774         /* Signal that mapping to nobody uid/gid is required */
 775         cred->cr_uid = (uid_t) -1;
 776         cred->cr_gid = (gid_t) -1;
 777         cred->cr_group_info = groups_alloc(0);
 778         if (cred->cr_group_info == NULL)
 779                 return SVC_DROP; /* kmalloc failure - client must retry */
 780
 781         /* Put NULL verifier */
 782         svc_putnl(resv, RPC_AUTH_NULL);
 783         svc_putnl(resv, 0);
 784
 785         rqstp->rq_flavor = RPC_AUTH_NULL;
 786         return SVC_OK;
 787 }
 788
 789 static int
 790 svcauth_null_release(struct svc_rqst *rqstp)
 791 {
 792         if (rqstp->rq_client)
 793                 auth_domain_put(rqstp->rq_client);
 794         rqstp->rq_client = NULL;
 795         if (rqstp->rq_cred.cr_group_info)
 796                 put_group_info(rqstp->rq_cred.cr_group_info);
 797         rqstp->rq_cred.cr_group_info = NULL;
 798
 799         return 0; /* don't drop */
 800 }
 801
 802
 803 struct auth_ops svcauth_null = {
 804         .name           = "null",
 805         .owner          = THIS_MODULE,
 806         .flavour        = RPC_AUTH_NULL,
 807         .accept         = svcauth_null_accept,
 808         .release        = svcauth_null_release,
 809         .set_client     = svcauth_unix_set_client,
 810 };
 811
 812
 813 static int
 814 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
 815 {
 816         struct kvec     *argv = &rqstp->rq_arg.head[0];
 817         struct kvec     *resv = &rqstp->rq_res.head[0];
 818         struct svc_cred *cred = &rqstp->rq_cred;
 819         u32             slen, i;
 820         int             len   = argv->iov_len;
 821
 822         cred->cr_group_info = NULL;
 823         rqstp->rq_client = NULL;
 824
 825         if ((len -= 3*4) < 0)
 826                 return SVC_GARBAGE;
 827
 828         svc_getu32(argv);                       /* length */
 829         svc_getu32(argv);                       /* time stamp */
 830         slen = XDR_QUADLEN(svc_getnl(argv));    /* machname length */
 831         if (slen > 64 || (len -= (slen + 3)*4) < 0)
 832                 goto badcred;
 833         argv->iov_base = (void*)((__be32*)argv->iov_base + slen);       /* skip machname */
 834         argv->iov_len -= slen*4;
 835
 836         cred->cr_uid = svc_getnl(argv);         /* uid */
 837         cred->cr_gid = svc_getnl(argv);         /* gid */
 838         slen = svc_getnl(argv);                 /* gids length */
 839         if (slen > 16 || (len -= (slen + 2)*4) < 0)
 840                 goto badcred;
 841         cred->cr_group_info = groups_alloc(slen);
 842         if (cred->cr_group_info == NULL)
 843                 return SVC_DROP;
 844         for (i = 0; i < slen; i++)
 845                 GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
 846         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
 847                 *authp = rpc_autherr_badverf;
 848                 return SVC_DENIED;
 849         }
 850
 851         /* Put NULL verifier */
 852         svc_putnl(resv, RPC_AUTH_NULL);
 853         svc_putnl(resv, 0);
 854
 855         rqstp->rq_flavor = RPC_AUTH_UNIX;
 856         return SVC_OK;
 857
 858 badcred:
 859         *authp = rpc_autherr_badcred;
 860         return SVC_DENIED;
 861 }
 862
 863 static int
 864 svcauth_unix_release(struct svc_rqst *rqstp)
 865 {
 866         /* Verifier (such as it is) is already in place.
 867          */
 868         if (rqstp->rq_client)
 869                 auth_domain_put(rqstp->rq_client);
 870         rqstp->rq_client = NULL;
 871         if (rqstp->rq_cred.cr_group_info)
 872                 put_group_info(rqstp->rq_cred.cr_group_info);
 873         rqstp->rq_cred.cr_group_info = NULL;
 874
 875         return 0;
 876 }
 877
 878
 879 struct auth_ops svcauth_unix = {
 880         .name           = "unix",
 881         .owner          = THIS_MODULE,
 882         .flavour        = RPC_AUTH_UNIX,
 883         .accept         = svcauth_unix_accept,
 884         .release        = svcauth_unix_release,
 885         .domain_release = svcauth_unix_domain_release,
 886         .set_client     = svcauth_unix_set_client,
 887 };
 888