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/sunrpc/addr.h>
  10#include <linux/err.h>
  11#include <linux/seq_file.h>
  12#include <linux/hash.h>
  13#include <linux/string.h>
  14#include <linux/slab.h>
  15#include <net/sock.h>
  16#include <net/ipv6.h>
  17#include <linux/kernel.h>
  18#include <linux/user_namespace.h>
  19#define RPCDBG_FACILITY RPCDBG_AUTH
  20
  21
  22#include "netns.h"
  23
  24/*
  25 * AUTHUNIX and AUTHNULL credentials are both handled here.
  26 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
  27 * are always nobody (-2).  i.e. we do the same IP address checks for
  28 * AUTHNULL as for AUTHUNIX, and that is done here.
  29 */
  30
  31
  32struct unix_domain {
  33        struct auth_domain      h;
  34        /* other stuff later */
  35};
  36
  37extern struct auth_ops svcauth_null;
  38extern struct auth_ops svcauth_unix;
  39
  40static void svcauth_unix_domain_release(struct auth_domain *dom)
  41{
  42        struct unix_domain *ud = container_of(dom, struct unix_domain, h);
  43
  44        kfree(dom->name);
  45        kfree(ud);
  46}
  47
  48struct auth_domain *unix_domain_find(char *name)
  49{
  50        struct auth_domain *rv;
  51        struct unix_domain *new = NULL;
  52
  53        rv = auth_domain_lookup(name, NULL);
  54        while(1) {
  55                if (rv) {
  56                        if (new && rv != &new->h)
  57                                svcauth_unix_domain_release(&new->h);
  58
  59                        if (rv->flavour != &svcauth_unix) {
  60                                auth_domain_put(rv);
  61                                return NULL;
  62                        }
  63                        return rv;
  64                }
  65
  66                new = kmalloc(sizeof(*new), GFP_KERNEL);
  67                if (new == NULL)
  68                        return NULL;
  69                kref_init(&new->h.ref);
  70                new->h.name = kstrdup(name, GFP_KERNEL);
  71                if (new->h.name == NULL) {
  72                        kfree(new);
  73                        return NULL;
  74                }
  75                new->h.flavour = &svcauth_unix;
  76                rv = auth_domain_lookup(name, &new->h);
  77        }
  78}
  79EXPORT_SYMBOL_GPL(unix_domain_find);
  80
  81
  82/**************************************************
  83 * cache for IP address to unix_domain
  84 * as needed by AUTH_UNIX
  85 */
  86#define IP_HASHBITS     8
  87#define IP_HASHMAX      (1<<IP_HASHBITS)
  88
  89struct ip_map {
  90        struct cache_head       h;
  91        char                    m_class[8]; /* e.g. "nfsd" */
  92        struct in6_addr         m_addr;
  93        struct unix_domain      *m_client;
  94};
  95
  96static void ip_map_put(struct kref *kref)
  97{
  98        struct cache_head *item = container_of(kref, struct cache_head, ref);
  99        struct ip_map *im = container_of(item, struct ip_map,h);
 100
 101        if (test_bit(CACHE_VALID, &item->flags) &&
 102            !test_bit(CACHE_NEGATIVE, &item->flags))
 103                auth_domain_put(&im->m_client->h);
 104        kfree(im);
 105}
 106
 107static inline int hash_ip6(const struct in6_addr *ip)
 108{
 109        return hash_32(ipv6_addr_hash(ip), IP_HASHBITS);
 110}
 111static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
 112{
 113        struct ip_map *orig = container_of(corig, struct ip_map, h);
 114        struct ip_map *new = container_of(cnew, struct ip_map, h);
 115        return strcmp(orig->m_class, new->m_class) == 0 &&
 116               ipv6_addr_equal(&orig->m_addr, &new->m_addr);
 117}
 118static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
 119{
 120        struct ip_map *new = container_of(cnew, struct ip_map, h);
 121        struct ip_map *item = container_of(citem, struct ip_map, h);
 122
 123        strcpy(new->m_class, item->m_class);
 124        new->m_addr = item->m_addr;
 125}
 126static void update(struct cache_head *cnew, struct cache_head *citem)
 127{
 128        struct ip_map *new = container_of(cnew, struct ip_map, h);
 129        struct ip_map *item = container_of(citem, struct ip_map, h);
 130
 131        kref_get(&item->m_client->h.ref);
 132        new->m_client = item->m_client;
 133}
 134static struct cache_head *ip_map_alloc(void)
 135{
 136        struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
 137        if (i)
 138                return &i->h;
 139        else
 140                return NULL;
 141}
 142
 143static void ip_map_request(struct cache_detail *cd,
 144                                  struct cache_head *h,
 145                                  char **bpp, int *blen)
 146{
 147        char text_addr[40];
 148        struct ip_map *im = container_of(h, struct ip_map, h);
 149
 150        if (ipv6_addr_v4mapped(&(im->m_addr))) {
 151                snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
 152        } else {
 153                snprintf(text_addr, 40, "%pI6", &im->m_addr);
 154        }
 155        qword_add(bpp, blen, im->m_class);
 156        qword_add(bpp, blen, text_addr);
 157        (*bpp)[-1] = '\n';
 158}
 159
 160static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
 161static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
 162
 163static int ip_map_parse(struct cache_detail *cd,
 164                          char *mesg, int mlen)
 165{
 166        /* class ipaddress [domainname] */
 167        /* should be safe just to use the start of the input buffer
 168         * for scratch: */
 169        char *buf = mesg;
 170        int len;
 171        char class[8];
 172        union {
 173                struct sockaddr         sa;
 174                struct sockaddr_in      s4;
 175                struct sockaddr_in6     s6;
 176        } address;
 177        struct sockaddr_in6 sin6;
 178        int err;
 179
 180        struct ip_map *ipmp;
 181        struct auth_domain *dom;
 182        time_t expiry;
 183
 184        if (mesg[mlen-1] != '\n')
 185                return -EINVAL;
 186        mesg[mlen-1] = 0;
 187
 188        /* class */
 189        len = qword_get(&mesg, class, sizeof(class));
 190        if (len <= 0) return -EINVAL;
 191
 192        /* ip address */
 193        len = qword_get(&mesg, buf, mlen);
 194        if (len <= 0) return -EINVAL;
 195
 196        if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
 197                return -EINVAL;
 198        switch (address.sa.sa_family) {
 199        case AF_INET:
 200                /* Form a mapped IPv4 address in sin6 */
 201                sin6.sin6_family = AF_INET6;
 202                ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
 203                                &sin6.sin6_addr);
 204                break;
 205#if IS_ENABLED(CONFIG_IPV6)
 206        case AF_INET6:
 207                memcpy(&sin6, &address.s6, sizeof(sin6));
 208                break;
 209#endif
 210        default:
 211                return -EINVAL;
 212        }
 213
 214        expiry = get_expiry(&mesg);
 215        if (expiry ==0)
 216                return -EINVAL;
 217
 218        /* domainname, or empty for NEGATIVE */
 219        len = qword_get(&mesg, buf, mlen);
 220        if (len < 0) return -EINVAL;
 221
 222        if (len) {
 223                dom = unix_domain_find(buf);
 224                if (dom == NULL)
 225                        return -ENOENT;
 226        } else
 227                dom = NULL;
 228
 229        /* IPv6 scope IDs are ignored for now */
 230        ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
 231        if (ipmp) {
 232                err = __ip_map_update(cd, ipmp,
 233                             container_of(dom, struct unix_domain, h),
 234                             expiry);
 235        } else
 236                err = -ENOMEM;
 237
 238        if (dom)
 239                auth_domain_put(dom);
 240
 241        cache_flush();
 242        return err;
 243}
 244
 245static int ip_map_show(struct seq_file *m,
 246                       struct cache_detail *cd,
 247                       struct cache_head *h)
 248{
 249        struct ip_map *im;
 250        struct in6_addr addr;
 251        char *dom = "-no-domain-";
 252
 253        if (h == NULL) {
 254                seq_puts(m, "#class IP domain\n");
 255                return 0;
 256        }
 257        im = container_of(h, struct ip_map, h);
 258        /* class addr domain */
 259        addr = im->m_addr;
 260
 261        if (test_bit(CACHE_VALID, &h->flags) &&
 262            !test_bit(CACHE_NEGATIVE, &h->flags))
 263                dom = im->m_client->h.name;
 264
 265        if (ipv6_addr_v4mapped(&addr)) {
 266                seq_printf(m, "%s %pI4 %s\n",
 267                        im->m_class, &addr.s6_addr32[3], dom);
 268        } else {
 269                seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
 270        }
 271        return 0;
 272}
 273
 274
 275static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
 276                struct in6_addr *addr)
 277{
 278        struct ip_map ip;
 279        struct cache_head *ch;
 280
 281        strcpy(ip.m_class, class);
 282        ip.m_addr = *addr;
 283        ch = sunrpc_cache_lookup(cd, &ip.h,
 284                                 hash_str(class, IP_HASHBITS) ^
 285                                 hash_ip6(addr));
 286
 287        if (ch)
 288                return container_of(ch, struct ip_map, h);
 289        else
 290                return NULL;
 291}
 292
 293static inline struct ip_map *ip_map_lookup(struct net *net, char *class,
 294                struct in6_addr *addr)
 295{
 296        struct sunrpc_net *sn;
 297
 298        sn = net_generic(net, sunrpc_net_id);
 299        return __ip_map_lookup(sn->ip_map_cache, class, addr);
 300}
 301
 302static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
 303                struct unix_domain *udom, time_t expiry)
 304{
 305        struct ip_map ip;
 306        struct cache_head *ch;
 307
 308        ip.m_client = udom;
 309        ip.h.flags = 0;
 310        if (!udom)
 311                set_bit(CACHE_NEGATIVE, &ip.h.flags);
 312        ip.h.expiry_time = expiry;
 313        ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
 314                                 hash_str(ipm->m_class, IP_HASHBITS) ^
 315                                 hash_ip6(&ipm->m_addr));
 316        if (!ch)
 317                return -ENOMEM;
 318        cache_put(ch, cd);
 319        return 0;
 320}
 321
 322static inline int ip_map_update(struct net *net, struct ip_map *ipm,
 323                struct unix_domain *udom, time_t expiry)
 324{
 325        struct sunrpc_net *sn;
 326
 327        sn = net_generic(net, sunrpc_net_id);
 328        return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry);
 329}
 330
 331void svcauth_unix_purge(struct net *net)
 332{
 333        struct sunrpc_net *sn;
 334
 335        sn = net_generic(net, sunrpc_net_id);
 336        cache_purge(sn->ip_map_cache);
 337}
 338EXPORT_SYMBOL_GPL(svcauth_unix_purge);
 339
 340static inline struct ip_map *
 341ip_map_cached_get(struct svc_xprt *xprt)
 342{
 343        struct ip_map *ipm = NULL;
 344        struct sunrpc_net *sn;
 345
 346        if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
 347                spin_lock(&xprt->xpt_lock);
 348                ipm = xprt->xpt_auth_cache;
 349                if (ipm != NULL) {
 350                        if (!cache_valid(&ipm->h)) {
 351                                /*
 352                                 * The entry has been invalidated since it was
 353                                 * remembered, e.g. by a second mount from the
 354                                 * same IP address.
 355                                 */
 356                                sn = net_generic(xprt->xpt_net, sunrpc_net_id);
 357                                xprt->xpt_auth_cache = NULL;
 358                                spin_unlock(&xprt->xpt_lock);
 359                                cache_put(&ipm->h, sn->ip_map_cache);
 360                                return NULL;
 361                        }
 362                        cache_get(&ipm->h);
 363                }
 364                spin_unlock(&xprt->xpt_lock);
 365        }
 366        return ipm;
 367}
 368
 369static inline void
 370ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
 371{
 372        if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
 373                spin_lock(&xprt->xpt_lock);
 374                if (xprt->xpt_auth_cache == NULL) {
 375                        /* newly cached, keep the reference */
 376                        xprt->xpt_auth_cache = ipm;
 377                        ipm = NULL;
 378                }
 379                spin_unlock(&xprt->xpt_lock);
 380        }
 381        if (ipm) {
 382                struct sunrpc_net *sn;
 383
 384                sn = net_generic(xprt->xpt_net, sunrpc_net_id);
 385                cache_put(&ipm->h, sn->ip_map_cache);
 386        }
 387}
 388
 389void
 390svcauth_unix_info_release(struct svc_xprt *xpt)
 391{
 392        struct ip_map *ipm;
 393
 394        ipm = xpt->xpt_auth_cache;
 395        if (ipm != NULL) {
 396                struct sunrpc_net *sn;
 397
 398                sn = net_generic(xpt->xpt_net, sunrpc_net_id);
 399                cache_put(&ipm->h, sn->ip_map_cache);
 400        }
 401}
 402
 403/****************************************************************************
 404 * auth.unix.gid cache
 405 * simple cache to map a UID to a list of GIDs
 406 * because AUTH_UNIX aka AUTH_SYS has a max of 16
 407 */
 408#define GID_HASHBITS    8
 409#define GID_HASHMAX     (1<<GID_HASHBITS)
 410
 411struct unix_gid {
 412        struct cache_head       h;
 413        kuid_t                  uid;
 414        struct group_info       *gi;
 415};
 416
 417static int unix_gid_hash(kuid_t uid)
 418{
 419        return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
 420}
 421
 422static void unix_gid_put(struct kref *kref)
 423{
 424        struct cache_head *item = container_of(kref, struct cache_head, ref);
 425        struct unix_gid *ug = container_of(item, struct unix_gid, h);
 426        if (test_bit(CACHE_VALID, &item->flags) &&
 427            !test_bit(CACHE_NEGATIVE, &item->flags))
 428                put_group_info(ug->gi);
 429        kfree(ug);
 430}
 431
 432static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
 433{
 434        struct unix_gid *orig = container_of(corig, struct unix_gid, h);
 435        struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 436        return uid_eq(orig->uid, new->uid);
 437}
 438static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
 439{
 440        struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 441        struct unix_gid *item = container_of(citem, struct unix_gid, h);
 442        new->uid = item->uid;
 443}
 444static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
 445{
 446        struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 447        struct unix_gid *item = container_of(citem, struct unix_gid, h);
 448
 449        get_group_info(item->gi);
 450        new->gi = item->gi;
 451}
 452static struct cache_head *unix_gid_alloc(void)
 453{
 454        struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
 455        if (g)
 456                return &g->h;
 457        else
 458                return NULL;
 459}
 460
 461static void unix_gid_request(struct cache_detail *cd,
 462                             struct cache_head *h,
 463                             char **bpp, int *blen)
 464{
 465        char tuid[20];
 466        struct unix_gid *ug = container_of(h, struct unix_gid, h);
 467
 468        snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
 469        qword_add(bpp, blen, tuid);
 470        (*bpp)[-1] = '\n';
 471}
 472
 473static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
 474
 475static int unix_gid_parse(struct cache_detail *cd,
 476                        char *mesg, int mlen)
 477{
 478        /* uid expiry Ngid gid0 gid1 ... gidN-1 */
 479        int id;
 480        kuid_t uid;
 481        int gids;
 482        int rv;
 483        int i;
 484        int err;
 485        time_t expiry;
 486        struct unix_gid ug, *ugp;
 487
 488        if (mesg[mlen - 1] != '\n')
 489                return -EINVAL;
 490        mesg[mlen-1] = 0;
 491
 492        rv = get_int(&mesg, &id);
 493        if (rv)
 494                return -EINVAL;
 495        uid = make_kuid(&init_user_ns, id);
 496        if (!uid_valid(uid))
 497                return -EINVAL;
 498        ug.uid = uid;
 499
 500        expiry = get_expiry(&mesg);
 501        if (expiry == 0)
 502                return -EINVAL;
 503
 504        rv = get_int(&mesg, &gids);
 505        if (rv || gids < 0 || gids > 8192)
 506                return -EINVAL;
 507
 508        ug.gi = groups_alloc(gids);
 509        if (!ug.gi)
 510                return -ENOMEM;
 511
 512        for (i = 0 ; i < gids ; i++) {
 513                int gid;
 514                kgid_t kgid;
 515                rv = get_int(&mesg, &gid);
 516                err = -EINVAL;
 517                if (rv)
 518                        goto out;
 519                kgid = make_kgid(&init_user_ns, gid);
 520                if (!gid_valid(kgid))
 521                        goto out;
 522                GROUP_AT(ug.gi, i) = kgid;
 523        }
 524
 525        ugp = unix_gid_lookup(cd, uid);
 526        if (ugp) {
 527                struct cache_head *ch;
 528                ug.h.flags = 0;
 529                ug.h.expiry_time = expiry;
 530                ch = sunrpc_cache_update(cd,
 531                                         &ug.h, &ugp->h,
 532                                         unix_gid_hash(uid));
 533                if (!ch)
 534                        err = -ENOMEM;
 535                else {
 536                        err = 0;
 537                        cache_put(ch, cd);
 538                }
 539        } else
 540                err = -ENOMEM;
 541 out:
 542        if (ug.gi)
 543                put_group_info(ug.gi);
 544        return err;
 545}
 546
 547static int unix_gid_show(struct seq_file *m,
 548                         struct cache_detail *cd,
 549                         struct cache_head *h)
 550{
 551        struct user_namespace *user_ns = &init_user_ns;
 552        struct unix_gid *ug;
 553        int i;
 554        int glen;
 555
 556        if (h == NULL) {
 557                seq_puts(m, "#uid cnt: gids...\n");
 558                return 0;
 559        }
 560        ug = container_of(h, struct unix_gid, h);
 561        if (test_bit(CACHE_VALID, &h->flags) &&
 562            !test_bit(CACHE_NEGATIVE, &h->flags))
 563                glen = ug->gi->ngroups;
 564        else
 565                glen = 0;
 566
 567        seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
 568        for (i = 0; i < glen; i++)
 569                seq_printf(m, " %d", from_kgid_munged(user_ns, GROUP_AT(ug->gi, i)));
 570        seq_printf(m, "\n");
 571        return 0;
 572}
 573
 574static struct cache_detail unix_gid_cache_template = {
 575        .owner          = THIS_MODULE,
 576        .hash_size      = GID_HASHMAX,
 577        .name           = "auth.unix.gid",
 578        .cache_put      = unix_gid_put,
 579        .cache_request  = unix_gid_request,
 580        .cache_parse    = unix_gid_parse,
 581        .cache_show     = unix_gid_show,
 582        .match          = unix_gid_match,
 583        .init           = unix_gid_init,
 584        .update         = unix_gid_update,
 585        .alloc          = unix_gid_alloc,
 586};
 587
 588int unix_gid_cache_create(struct net *net)
 589{
 590        struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 591        struct cache_detail *cd;
 592        int err;
 593
 594        cd = cache_create_net(&unix_gid_cache_template, net);
 595        if (IS_ERR(cd))
 596                return PTR_ERR(cd);
 597        err = cache_register_net(cd, net);
 598        if (err) {
 599                cache_destroy_net(cd, net);
 600                return err;
 601        }
 602        sn->unix_gid_cache = cd;
 603        return 0;
 604}
 605
 606void unix_gid_cache_destroy(struct net *net)
 607{
 608        struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 609        struct cache_detail *cd = sn->unix_gid_cache;
 610
 611        sn->unix_gid_cache = NULL;
 612        cache_purge(cd);
 613        cache_unregister_net(cd, net);
 614        cache_destroy_net(cd, net);
 615}
 616
 617static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
 618{
 619        struct unix_gid ug;
 620        struct cache_head *ch;
 621
 622        ug.uid = uid;
 623        ch = sunrpc_cache_lookup(cd, &ug.h, unix_gid_hash(uid));
 624        if (ch)
 625                return container_of(ch, struct unix_gid, h);
 626        else
 627                return NULL;
 628}
 629
 630static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
 631{
 632        struct unix_gid *ug;
 633        struct group_info *gi;
 634        int ret;
 635        struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
 636                                            sunrpc_net_id);
 637
 638        ug = unix_gid_lookup(sn->unix_gid_cache, uid);
 639        if (!ug)
 640                return ERR_PTR(-EAGAIN);
 641        ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
 642        switch (ret) {
 643        case -ENOENT:
 644                return ERR_PTR(-ENOENT);
 645        case -ETIMEDOUT:
 646                return ERR_PTR(-ESHUTDOWN);
 647        case 0:
 648                gi = get_group_info(ug->gi);
 649                cache_put(&ug->h, sn->unix_gid_cache);
 650                return gi;
 651        default:
 652                return ERR_PTR(-EAGAIN);
 653        }
 654}
 655
 656int
 657svcauth_unix_set_client(struct svc_rqst *rqstp)
 658{
 659        struct sockaddr_in *sin;
 660        struct sockaddr_in6 *sin6, sin6_storage;
 661        struct ip_map *ipm;
 662        struct group_info *gi;
 663        struct svc_cred *cred = &rqstp->rq_cred;
 664        struct svc_xprt *xprt = rqstp->rq_xprt;
 665        struct net *net = xprt->xpt_net;
 666        struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 667
 668        switch (rqstp->rq_addr.ss_family) {
 669        case AF_INET:
 670                sin = svc_addr_in(rqstp);
 671                sin6 = &sin6_storage;
 672                ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
 673                break;
 674        case AF_INET6:
 675                sin6 = svc_addr_in6(rqstp);
 676                break;
 677        default:
 678                BUG();
 679        }
 680
 681        rqstp->rq_client = NULL;
 682        if (rqstp->rq_proc == 0)
 683                return SVC_OK;
 684
 685        ipm = ip_map_cached_get(xprt);
 686        if (ipm == NULL)
 687                ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
 688                                    &sin6->sin6_addr);
 689
 690        if (ipm == NULL)
 691                return SVC_DENIED;
 692
 693        switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
 694                default:
 695                        BUG();
 696                case -ETIMEDOUT:
 697                        return SVC_CLOSE;
 698                case -EAGAIN:
 699                        return SVC_DROP;
 700                case -ENOENT:
 701                        return SVC_DENIED;
 702                case 0:
 703                        rqstp->rq_client = &ipm->m_client->h;
 704                        kref_get(&rqstp->rq_client->ref);
 705                        ip_map_cached_put(xprt, ipm);
 706                        break;
 707        }
 708
 709        gi = unix_gid_find(cred->cr_uid, rqstp);
 710        switch (PTR_ERR(gi)) {
 711        case -EAGAIN:
 712                return SVC_DROP;
 713        case -ESHUTDOWN:
 714                return SVC_CLOSE;
 715        case -ENOENT:
 716                break;
 717        default:
 718                put_group_info(cred->cr_group_info);
 719                cred->cr_group_info = gi;
 720        }
 721        return SVC_OK;
 722}
 723
 724EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
 725
 726static int
 727svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
 728{
 729        struct kvec     *argv = &rqstp->rq_arg.head[0];
 730        struct kvec     *resv = &rqstp->rq_res.head[0];
 731        struct svc_cred *cred = &rqstp->rq_cred;
 732
 733        cred->cr_group_info = NULL;
 734        cred->cr_principal = NULL;
 735        rqstp->rq_client = NULL;
 736
 737        if (argv->iov_len < 3*4)
 738                return SVC_GARBAGE;
 739
 740        if (svc_getu32(argv) != 0) {
 741                dprintk("svc: bad null cred\n");
 742                *authp = rpc_autherr_badcred;
 743                return SVC_DENIED;
 744        }
 745        if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
 746                dprintk("svc: bad null verf\n");
 747                *authp = rpc_autherr_badverf;
 748                return SVC_DENIED;
 749        }
 750
 751        /* Signal that mapping to nobody uid/gid is required */
 752        cred->cr_uid = INVALID_UID;
 753        cred->cr_gid = INVALID_GID;
 754        cred->cr_group_info = groups_alloc(0);
 755        if (cred->cr_group_info == NULL)
 756                return SVC_CLOSE; /* kmalloc failure - client must retry */
 757
 758        /* Put NULL verifier */
 759        svc_putnl(resv, RPC_AUTH_NULL);
 760        svc_putnl(resv, 0);
 761
 762        rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
 763        return SVC_OK;
 764}
 765
 766static int
 767svcauth_null_release(struct svc_rqst *rqstp)
 768{
 769        if (rqstp->rq_client)
 770                auth_domain_put(rqstp->rq_client);
 771        rqstp->rq_client = NULL;
 772        if (rqstp->rq_cred.cr_group_info)
 773                put_group_info(rqstp->rq_cred.cr_group_info);
 774        rqstp->rq_cred.cr_group_info = NULL;
 775
 776        return 0; /* don't drop */
 777}
 778
 779
 780struct auth_ops svcauth_null = {
 781        .name           = "null",
 782        .owner          = THIS_MODULE,
 783        .flavour        = RPC_AUTH_NULL,
 784        .accept         = svcauth_null_accept,
 785        .release        = svcauth_null_release,
 786        .set_client     = svcauth_unix_set_client,
 787};
 788
 789
 790static int
 791svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
 792{
 793        struct kvec     *argv = &rqstp->rq_arg.head[0];
 794        struct kvec     *resv = &rqstp->rq_res.head[0];
 795        struct svc_cred *cred = &rqstp->rq_cred;
 796        u32             slen, i;
 797        int             len   = argv->iov_len;
 798
 799        cred->cr_group_info = NULL;
 800        cred->cr_principal = NULL;
 801        rqstp->rq_client = NULL;
 802
 803        if ((len -= 3*4) < 0)
 804                return SVC_GARBAGE;
 805
 806        svc_getu32(argv);                       /* length */
 807        svc_getu32(argv);                       /* time stamp */
 808        slen = XDR_QUADLEN(svc_getnl(argv));    /* machname length */
 809        if (slen > 64 || (len -= (slen + 3)*4) < 0)
 810                goto badcred;
 811        argv->iov_base = (void*)((__be32*)argv->iov_base + slen);       /* skip machname */
 812        argv->iov_len -= slen*4;
 813        /*
 814         * Note: we skip uid_valid()/gid_valid() checks here for
 815         * backwards compatibility with clients that use -1 id's.
 816         * Instead, -1 uid or gid is later mapped to the
 817         * (export-specific) anonymous id by nfsd_setuser.
 818         * Supplementary gid's will be left alone.
 819         */
 820        cred->cr_uid = make_kuid(&init_user_ns, svc_getnl(argv)); /* uid */
 821        cred->cr_gid = make_kgid(&init_user_ns, svc_getnl(argv)); /* gid */
 822        slen = svc_getnl(argv);                 /* gids length */
 823        if (slen > 16 || (len -= (slen + 2)*4) < 0)
 824                goto badcred;
 825        cred->cr_group_info = groups_alloc(slen);
 826        if (cred->cr_group_info == NULL)
 827                return SVC_CLOSE;
 828        for (i = 0; i < slen; i++) {
 829                kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
 830                GROUP_AT(cred->cr_group_info, i) = kgid;
 831        }
 832        if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
 833                *authp = rpc_autherr_badverf;
 834                return SVC_DENIED;
 835        }
 836
 837        /* Put NULL verifier */
 838        svc_putnl(resv, RPC_AUTH_NULL);
 839        svc_putnl(resv, 0);
 840
 841        rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
 842        return SVC_OK;
 843
 844badcred:
 845        *authp = rpc_autherr_badcred;
 846        return SVC_DENIED;
 847}
 848
 849static int
 850svcauth_unix_release(struct svc_rqst *rqstp)
 851{
 852        /* Verifier (such as it is) is already in place.
 853         */
 854        if (rqstp->rq_client)
 855                auth_domain_put(rqstp->rq_client);
 856        rqstp->rq_client = NULL;
 857        if (rqstp->rq_cred.cr_group_info)
 858                put_group_info(rqstp->rq_cred.cr_group_info);
 859        rqstp->rq_cred.cr_group_info = NULL;
 860
 861        return 0;
 862}
 863
 864
 865struct auth_ops svcauth_unix = {
 866        .name           = "unix",
 867        .owner          = THIS_MODULE,
 868        .flavour        = RPC_AUTH_UNIX,
 869        .accept         = svcauth_unix_accept,
 870        .release        = svcauth_unix_release,
 871        .domain_release = svcauth_unix_domain_release,
 872        .set_client     = svcauth_unix_set_client,
 873};
 874
 875static struct cache_detail ip_map_cache_template = {
 876        .owner          = THIS_MODULE,
 877        .hash_size      = IP_HASHMAX,
 878        .name           = "auth.unix.ip",
 879        .cache_put      = ip_map_put,
 880        .cache_request  = ip_map_request,
 881        .cache_parse    = ip_map_parse,
 882        .cache_show     = ip_map_show,
 883        .match          = ip_map_match,
 884        .init           = ip_map_init,
 885        .update         = update,
 886        .alloc          = ip_map_alloc,
 887};
 888
 889int ip_map_cache_create(struct net *net)
 890{
 891        struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 892        struct cache_detail *cd;
 893        int err;
 894
 895        cd = cache_create_net(&ip_map_cache_template, net);
 896        if (IS_ERR(cd))
 897                return PTR_ERR(cd);
 898        err = cache_register_net(cd, net);
 899        if (err) {
 900                cache_destroy_net(cd, net);
 901                return err;
 902        }
 903        sn->ip_map_cache = cd;
 904        return 0;
 905}
 906
 907void ip_map_cache_destroy(struct net *net)
 908{
 909        struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 910        struct cache_detail *cd = sn->ip_map_cache;
 911
 912        sn->ip_map_cache = NULL;
 913        cache_purge(cd);
 914        cache_unregister_net(cd, net);
 915        cache_destroy_net(cd, net);
 916}
 917