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