linux/net/sunrpc/svcauth_unix.c
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   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
  29struct unix_domain {
  30        struct auth_domain      h;
  31        int     addr_changes;
  32        /* other stuff later */
  33};
  34
  35extern struct auth_ops svcauth_unix;
  36
  37struct 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}
  69EXPORT_SYMBOL_GPL(unix_domain_find);
  70
  71static 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
  88struct 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};
  95static struct cache_head        *ip_table[IP_HASHMAX];
  96
  97static 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 */
 113static 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
 119static 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}
 126static 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}
 133static 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}
 141static 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}
 150static 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
 159static 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
 176static 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
 181static struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr);
 182static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
 183
 184static 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
 267static 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
 297struct 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
 312static 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
 329static 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
 357int 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}
 372EXPORT_SYMBOL_GPL(auth_unix_add_addr);
 373
 374int 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}
 384EXPORT_SYMBOL_GPL(auth_unix_forget_old);
 385
 386struct 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}
 409EXPORT_SYMBOL_GPL(auth_unix_lookup);
 410
 411void svcauth_unix_purge(void)
 412{
 413        cache_purge(&ip_map_cache);
 414}
 415EXPORT_SYMBOL_GPL(svcauth_unix_purge);
 416
 417static inline struct ip_map *
 418ip_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
 445static inline void
 446ip_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
 463void
 464svcauth_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
 479struct unix_gid {
 480        struct cache_head       h;
 481        uid_t                   uid;
 482        struct group_info       *gi;
 483};
 484static struct cache_head        *gid_table[GID_HASHMAX];
 485
 486static 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
 496static 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}
 502static 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}
 508static 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}
 516static 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
 525static 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
 537static 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
 542static struct unix_gid *unix_gid_lookup(uid_t uid);
 543extern struct cache_detail unix_gid_cache;
 544
 545static 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
 609static 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
 635struct 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
 650static 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
 664static 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
 686int
 687svcauth_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
 748EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
 749
 750static int
 751svcauth_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
 789static int
 790svcauth_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
 803struct 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
 813static int
 814svcauth_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
 858badcred:
 859        *authp = rpc_autherr_badcred;
 860        return SVC_DENIED;
 861}
 862
 863static int
 864svcauth_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
 879struct 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
 889