svcauth_gss.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Neil Brown <neilb@cse.unsw.edu.au>
   4 * J. Bruce Fields <bfields@umich.edu>
   5 * Andy Adamson <andros@umich.edu>
   6 * Dug Song <dugsong@monkey.org>
   7 *
   8 * RPCSEC_GSS server authentication.
   9 * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078
  10 * (gssapi)
  11 *
  12 * The RPCSEC_GSS involves three stages:
  13 *  1/ context creation
  14 *  2/ data exchange
  15 *  3/ context destruction
  16 *
  17 * Context creation is handled largely by upcalls to user-space.
  18 *  In particular, GSS_Accept_sec_context is handled by an upcall
  19 * Data exchange is handled entirely within the kernel
  20 *  In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel.
  21 * Context destruction is handled in-kernel
  22 *  GSS_Delete_sec_context is in-kernel
  23 *
  24 * Context creation is initiated by a RPCSEC_GSS_INIT request arriving.
  25 * The context handle and gss_token are used as a key into the rpcsec_init cache.
  26 * The content of this cache includes some of the outputs of GSS_Accept_sec_context,
  27 * being major_status, minor_status, context_handle, reply_token.
  28 * These are sent back to the client.
  29 * Sequence window management is handled by the kernel.  The window size if currently
  30 * a compile time constant.
  31 *
  32 * When user-space is happy that a context is established, it places an entry
  33 * in the rpcsec_context cache. The key for this cache is the context_handle.
  34 * The content includes:
  35 *   uid/gidlist - for determining access rights
  36 *   mechanism type
  37 *   mechanism specific information, such as a key
  38 *
  39 */
  40
  41#include <linux/slab.h>
  42#include <linux/types.h>
  43#include <linux/module.h>
  44#include <linux/pagemap.h>
  45#include <linux/user_namespace.h>
  46
  47#include <linux/sunrpc/auth_gss.h>
  48#include <linux/sunrpc/gss_err.h>
  49#include <linux/sunrpc/svcauth.h>
  50#include <linux/sunrpc/svcauth_gss.h>
  51#include <linux/sunrpc/cache.h>
  52#include <linux/sunrpc/gss_krb5.h>
  53
  54#include <trace/events/rpcgss.h>
  55
  56#include "gss_rpc_upcall.h"
  57
  58/*
  59 * Unfortunately there isn't a maximum checksum size exported via the
  60 * GSS API. Manufacture one based on GSS mechanisms supported by this
  61 * implementation.
  62 */
  63#define GSS_MAX_CKSUMSIZE (GSS_KRB5_TOK_HDR_LEN + GSS_KRB5_MAX_CKSUM_LEN)
  64
  65/*
  66 * This value may be increased in the future to accommodate other
  67 * usage of the scratch buffer.
  68 */
  69#define GSS_SCRATCH_SIZE GSS_MAX_CKSUMSIZE
  70
  71struct gss_svc_data {
  72	/* decoded gss client cred: */
  73	struct rpc_gss_wire_cred	clcred;
  74	u32				gsd_databody_offset;
  75	struct rsc			*rsci;
  76
  77	/* for temporary results */
  78	__be32				gsd_seq_num;
  79	u8				gsd_scratch[GSS_SCRATCH_SIZE];
  80};
  81
  82/* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
  83 * into replies.
  84 *
  85 * Key is context handle (\x if empty) and gss_token.
  86 * Content is major_status minor_status (integers) context_handle, reply_token.
  87 *
  88 */
  89
  90static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b)
  91{
  92	return a->len == b->len && 0 == memcmp(a->data, b->data, a->len);
  93}
  94
  95#define	RSI_HASHBITS	6
  96#define	RSI_HASHMAX	(1<<RSI_HASHBITS)
  97
  98struct rsi {
  99	struct cache_head	h;
 100	struct xdr_netobj	in_handle, in_token;
 101	struct xdr_netobj	out_handle, out_token;
 102	int			major_status, minor_status;
 103	struct rcu_head		rcu_head;
 104};
 105
 106static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
 107static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item);
 108
 109static void rsi_free(struct rsi *rsii)
 110{
 111	kfree(rsii->in_handle.data);
 112	kfree(rsii->in_token.data);
 113	kfree(rsii->out_handle.data);
 114	kfree(rsii->out_token.data);
 115}
 116
 117static void rsi_free_rcu(struct rcu_head *head)
 118{
 119	struct rsi *rsii = container_of(head, struct rsi, rcu_head);
 120
 121	rsi_free(rsii);
 122	kfree(rsii);
 123}
 124
 125static void rsi_put(struct kref *ref)
 126{
 127	struct rsi *rsii = container_of(ref, struct rsi, h.ref);
 128
 129	call_rcu(&rsii->rcu_head, rsi_free_rcu);
 130}
 131
 132static inline int rsi_hash(struct rsi *item)
 133{
 134	return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
 135	     ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
 136}
 137
 138static int rsi_match(struct cache_head *a, struct cache_head *b)
 139{
 140	struct rsi *item = container_of(a, struct rsi, h);
 141	struct rsi *tmp = container_of(b, struct rsi, h);
 142	return netobj_equal(&item->in_handle, &tmp->in_handle) &&
 143	       netobj_equal(&item->in_token, &tmp->in_token);
 144}
 145
 146static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
 147{
 148	dst->len = len;
 149	dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL);
 150	if (len && !dst->data)
 151		return -ENOMEM;
 152	return 0;
 153}
 154
 155static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src)
 156{
 157	return dup_to_netobj(dst, src->data, src->len);
 158}
 159
 160static void rsi_init(struct cache_head *cnew, struct cache_head *citem)
 161{
 162	struct rsi *new = container_of(cnew, struct rsi, h);
 163	struct rsi *item = container_of(citem, struct rsi, h);
 164
 165	new->out_handle.data = NULL;
 166	new->out_handle.len = 0;
 167	new->out_token.data = NULL;
 168	new->out_token.len = 0;
 169	new->in_handle.len = item->in_handle.len;
 170	item->in_handle.len = 0;
 171	new->in_token.len = item->in_token.len;
 172	item->in_token.len = 0;
 173	new->in_handle.data = item->in_handle.data;
 174	item->in_handle.data = NULL;
 175	new->in_token.data = item->in_token.data;
 176	item->in_token.data = NULL;
 177}
 178
 179static void update_rsi(struct cache_head *cnew, struct cache_head *citem)
 180{
 181	struct rsi *new = container_of(cnew, struct rsi, h);
 182	struct rsi *item = container_of(citem, struct rsi, h);
 183
 184	BUG_ON(new->out_handle.data || new->out_token.data);
 185	new->out_handle.len = item->out_handle.len;
 186	item->out_handle.len = 0;
 187	new->out_token.len = item->out_token.len;
 188	item->out_token.len = 0;
 189	new->out_handle.data = item->out_handle.data;
 190	item->out_handle.data = NULL;
 191	new->out_token.data = item->out_token.data;
 192	item->out_token.data = NULL;
 193
 194	new->major_status = item->major_status;
 195	new->minor_status = item->minor_status;
 196}
 197
 198static struct cache_head *rsi_alloc(void)
 199{
 200	struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL);
 201	if (rsii)
 202		return &rsii->h;
 203	else
 204		return NULL;
 205}
 206
 207static int rsi_upcall(struct cache_detail *cd, struct cache_head *h)
 208{
 209	return sunrpc_cache_pipe_upcall_timeout(cd, h);
 210}
 211
 212static void rsi_request(struct cache_detail *cd,
 213		       struct cache_head *h,
 214		       char **bpp, int *blen)
 215{
 216	struct rsi *rsii = container_of(h, struct rsi, h);
 217
 218	qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
 219	qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
 220	(*bpp)[-1] = '\n';
 221	WARN_ONCE(*blen < 0,
 222		  "RPCSEC/GSS credential too large - please use gssproxy\n");
 223}
 224
 225static int rsi_parse(struct cache_detail *cd,
 226		    char *mesg, int mlen)
 227{
 228	/* context token expiry major minor context token */
 229	char *buf = mesg;
 230	char *ep;
 231	int len;
 232	struct rsi rsii, *rsip = NULL;
 233	time64_t expiry;
 234	int status = -EINVAL;
 235
 236	memset(&rsii, 0, sizeof(rsii));
 237	/* handle */
 238	len = qword_get(&mesg, buf, mlen);
 239	if (len < 0)
 240		goto out;
 241	status = -ENOMEM;
 242	if (dup_to_netobj(&rsii.in_handle, buf, len))
 243		goto out;
 244
 245	/* token */
 246	len = qword_get(&mesg, buf, mlen);
 247	status = -EINVAL;
 248	if (len < 0)
 249		goto out;
 250	status = -ENOMEM;
 251	if (dup_to_netobj(&rsii.in_token, buf, len))
 252		goto out;
 253
 254	rsip = rsi_lookup(cd, &rsii);
 255	if (!rsip)
 256		goto out;
 257
 258	rsii.h.flags = 0;
 259	/* expiry */
 260	status = get_expiry(&mesg, &expiry);
 261	if (status)
 262		goto out;
 263
 264	status = -EINVAL;
 265	/* major/minor */
 266	len = qword_get(&mesg, buf, mlen);
 267	if (len <= 0)
 268		goto out;
 269	rsii.major_status = simple_strtoul(buf, &ep, 10);
 270	if (*ep)
 271		goto out;
 272	len = qword_get(&mesg, buf, mlen);
 273	if (len <= 0)
 274		goto out;
 275	rsii.minor_status = simple_strtoul(buf, &ep, 10);
 276	if (*ep)
 277		goto out;
 278
 279	/* out_handle */
 280	len = qword_get(&mesg, buf, mlen);
 281	if (len < 0)
 282		goto out;
 283	status = -ENOMEM;
 284	if (dup_to_netobj(&rsii.out_handle, buf, len))
 285		goto out;
 286
 287	/* out_token */
 288	len = qword_get(&mesg, buf, mlen);
 289	status = -EINVAL;
 290	if (len < 0)
 291		goto out;
 292	status = -ENOMEM;
 293	if (dup_to_netobj(&rsii.out_token, buf, len))
 294		goto out;
 295	rsii.h.expiry_time = expiry;
 296	rsip = rsi_update(cd, &rsii, rsip);
 297	status = 0;
 298out:
 299	rsi_free(&rsii);
 300	if (rsip)
 301		cache_put(&rsip->h, cd);
 302	else
 303		status = -ENOMEM;
 304	return status;
 305}
 306
 307static const struct cache_detail rsi_cache_template = {
 308	.owner		= THIS_MODULE,
 309	.hash_size	= RSI_HASHMAX,
 310	.name           = "auth.rpcsec.init",
 311	.cache_put      = rsi_put,
 312	.cache_upcall	= rsi_upcall,
 313	.cache_request  = rsi_request,
 314	.cache_parse    = rsi_parse,
 315	.match		= rsi_match,
 316	.init		= rsi_init,
 317	.update		= update_rsi,
 318	.alloc		= rsi_alloc,
 319};
 320
 321static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
 322{
 323	struct cache_head *ch;
 324	int hash = rsi_hash(item);
 325
 326	ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
 327	if (ch)
 328		return container_of(ch, struct rsi, h);
 329	else
 330		return NULL;
 331}
 332
 333static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old)
 334{
 335	struct cache_head *ch;
 336	int hash = rsi_hash(new);
 337
 338	ch = sunrpc_cache_update(cd, &new->h,
 339				 &old->h, hash);
 340	if (ch)
 341		return container_of(ch, struct rsi, h);
 342	else
 343		return NULL;
 344}
 345
 346
 347/*
 348 * The rpcsec_context cache is used to store a context that is
 349 * used in data exchange.
 350 * The key is a context handle. The content is:
 351 *  uid, gidlist, mechanism, service-set, mech-specific-data
 352 */
 353
 354#define	RSC_HASHBITS	10
 355#define	RSC_HASHMAX	(1<<RSC_HASHBITS)
 356
 357#define GSS_SEQ_WIN	128
 358
 359struct gss_svc_seq_data {
 360	/* highest seq number seen so far: */
 361	u32			sd_max;
 362	/* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
 363	 * sd_win is nonzero iff sequence number i has been seen already: */
 364	unsigned long		sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
 365	spinlock_t		sd_lock;
 366};
 367
 368struct rsc {
 369	struct cache_head	h;
 370	struct xdr_netobj	handle;
 371	struct svc_cred		cred;
 372	struct gss_svc_seq_data	seqdata;
 373	struct gss_ctx		*mechctx;
 374	struct rcu_head		rcu_head;
 375};
 376
 377static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
 378static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item);
 379
 380static void rsc_free(struct rsc *rsci)
 381{
 382	kfree(rsci->handle.data);
 383	if (rsci->mechctx)
 384		gss_delete_sec_context(&rsci->mechctx);
 385	free_svc_cred(&rsci->cred);
 386}
 387
 388static void rsc_free_rcu(struct rcu_head *head)
 389{
 390	struct rsc *rsci = container_of(head, struct rsc, rcu_head);
 391
 392	kfree(rsci->handle.data);
 393	kfree(rsci);
 394}
 395
 396static void rsc_put(struct kref *ref)
 397{
 398	struct rsc *rsci = container_of(ref, struct rsc, h.ref);
 399
 400	if (rsci->mechctx)
 401		gss_delete_sec_context(&rsci->mechctx);
 402	free_svc_cred(&rsci->cred);
 403	call_rcu(&rsci->rcu_head, rsc_free_rcu);
 404}
 405
 406static inline int
 407rsc_hash(struct rsc *rsci)
 408{
 409	return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
 410}
 411
 412static int
 413rsc_match(struct cache_head *a, struct cache_head *b)
 414{
 415	struct rsc *new = container_of(a, struct rsc, h);
 416	struct rsc *tmp = container_of(b, struct rsc, h);
 417
 418	return netobj_equal(&new->handle, &tmp->handle);
 419}
 420
 421static void
 422rsc_init(struct cache_head *cnew, struct cache_head *ctmp)
 423{
 424	struct rsc *new = container_of(cnew, struct rsc, h);
 425	struct rsc *tmp = container_of(ctmp, struct rsc, h);
 426
 427	new->handle.len = tmp->handle.len;
 428	tmp->handle.len = 0;
 429	new->handle.data = tmp->handle.data;
 430	tmp->handle.data = NULL;
 431	new->mechctx = NULL;
 432	init_svc_cred(&new->cred);
 433}
 434
 435static void
 436update_rsc(struct cache_head *cnew, struct cache_head *ctmp)
 437{
 438	struct rsc *new = container_of(cnew, struct rsc, h);
 439	struct rsc *tmp = container_of(ctmp, struct rsc, h);
 440
 441	new->mechctx = tmp->mechctx;
 442	tmp->mechctx = NULL;
 443	memset(&new->seqdata, 0, sizeof(new->seqdata));
 444	spin_lock_init(&new->seqdata.sd_lock);
 445	new->cred = tmp->cred;
 446	init_svc_cred(&tmp->cred);
 447}
 448
 449static struct cache_head *
 450rsc_alloc(void)
 451{
 452	struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL);
 453	if (rsci)
 454		return &rsci->h;
 455	else
 456		return NULL;
 457}
 458
 459static int rsc_upcall(struct cache_detail *cd, struct cache_head *h)
 460{
 461	return -EINVAL;
 462}
 463
 464static int rsc_parse(struct cache_detail *cd,
 465		     char *mesg, int mlen)
 466{
 467	/* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
 468	char *buf = mesg;
 469	int id;
 470	int len, rv;
 471	struct rsc rsci, *rscp = NULL;
 472	time64_t expiry;
 473	int status = -EINVAL;
 474	struct gss_api_mech *gm = NULL;
 475
 476	memset(&rsci, 0, sizeof(rsci));
 477	/* context handle */
 478	len = qword_get(&mesg, buf, mlen);
 479	if (len < 0) goto out;
 480	status = -ENOMEM;
 481	if (dup_to_netobj(&rsci.handle, buf, len))
 482		goto out;
 483
 484	rsci.h.flags = 0;
 485	/* expiry */
 486	status = get_expiry(&mesg, &expiry);
 487	if (status)
 488		goto out;
 489
 490	status = -EINVAL;
 491	rscp = rsc_lookup(cd, &rsci);
 492	if (!rscp)
 493		goto out;
 494
 495	/* uid, or NEGATIVE */
 496	rv = get_int(&mesg, &id);
 497	if (rv == -EINVAL)
 498		goto out;
 499	if (rv == -ENOENT)
 500		set_bit(CACHE_NEGATIVE, &rsci.h.flags);
 501	else {
 502		int N, i;
 503
 504		/*
 505		 * NOTE: we skip uid_valid()/gid_valid() checks here:
 506		 * instead, * -1 id's are later mapped to the
 507		 * (export-specific) anonymous id by nfsd_setuser.
 508		 *
 509		 * (But supplementary gid's get no such special
 510		 * treatment so are checked for validity here.)
 511		 */
 512		/* uid */
 513		rsci.cred.cr_uid = make_kuid(current_user_ns(), id);
 514
 515		/* gid */
 516		if (get_int(&mesg, &id))
 517			goto out;
 518		rsci.cred.cr_gid = make_kgid(current_user_ns(), id);
 519
 520		/* number of additional gid's */
 521		if (get_int(&mesg, &N))
 522			goto out;
 523		if (N < 0 || N > NGROUPS_MAX)
 524			goto out;
 525		status = -ENOMEM;
 526		rsci.cred.cr_group_info = groups_alloc(N);
 527		if (rsci.cred.cr_group_info == NULL)
 528			goto out;
 529
 530		/* gid's */
 531		status = -EINVAL;
 532		for (i=0; i<N; i++) {
 533			kgid_t kgid;
 534			if (get_int(&mesg, &id))
 535				goto out;
 536			kgid = make_kgid(current_user_ns(), id);
 537			if (!gid_valid(kgid))
 538				goto out;
 539			rsci.cred.cr_group_info->gid[i] = kgid;
 540		}
 541		groups_sort(rsci.cred.cr_group_info);
 542
 543		/* mech name */
 544		len = qword_get(&mesg, buf, mlen);
 545		if (len < 0)
 546			goto out;
 547		gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf);
 548		status = -EOPNOTSUPP;
 549		if (!gm)
 550			goto out;
 551
 552		status = -EINVAL;
 553		/* mech-specific data: */
 554		len = qword_get(&mesg, buf, mlen);
 555		if (len < 0)
 556			goto out;
 557		status = gss_import_sec_context(buf, len, gm, &rsci.mechctx,
 558						NULL, GFP_KERNEL);
 559		if (status)
 560			goto out;
 561
 562		/* get client name */
 563		len = qword_get(&mesg, buf, mlen);
 564		if (len > 0) {
 565			rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL);
 566			if (!rsci.cred.cr_principal) {
 567				status = -ENOMEM;
 568				goto out;
 569			}
 570		}
 571
 572	}
 573	rsci.h.expiry_time = expiry;
 574	rscp = rsc_update(cd, &rsci, rscp);
 575	status = 0;
 576out:
 577	rsc_free(&rsci);
 578	if (rscp)
 579		cache_put(&rscp->h, cd);
 580	else
 581		status = -ENOMEM;
 582	return status;
 583}
 584
 585static const struct cache_detail rsc_cache_template = {
 586	.owner		= THIS_MODULE,
 587	.hash_size	= RSC_HASHMAX,
 588	.name		= "auth.rpcsec.context",
 589	.cache_put	= rsc_put,
 590	.cache_upcall	= rsc_upcall,
 591	.cache_parse	= rsc_parse,
 592	.match		= rsc_match,
 593	.init		= rsc_init,
 594	.update		= update_rsc,
 595	.alloc		= rsc_alloc,
 596};
 597
 598static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
 599{
 600	struct cache_head *ch;
 601	int hash = rsc_hash(item);
 602
 603	ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
 604	if (ch)
 605		return container_of(ch, struct rsc, h);
 606	else
 607		return NULL;
 608}
 609
 610static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old)
 611{
 612	struct cache_head *ch;
 613	int hash = rsc_hash(new);
 614
 615	ch = sunrpc_cache_update(cd, &new->h,
 616				 &old->h, hash);
 617	if (ch)
 618		return container_of(ch, struct rsc, h);
 619	else
 620		return NULL;
 621}
 622
 623
 624static struct rsc *
 625gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle)
 626{
 627	struct rsc rsci;
 628	struct rsc *found;
 629
 630	memset(&rsci, 0, sizeof(rsci));
 631	if (dup_to_netobj(&rsci.handle, handle->data, handle->len))
 632		return NULL;
 633	found = rsc_lookup(cd, &rsci);
 634	rsc_free(&rsci);
 635	if (!found)
 636		return NULL;
 637	if (cache_check(cd, &found->h, NULL))
 638		return NULL;
 639	return found;
 640}
 641
 642/**
 643 * gss_check_seq_num - GSS sequence number window check
 644 * @rqstp: RPC Call to use when reporting errors
 645 * @rsci: cached GSS context state (updated on return)
 646 * @seq_num: sequence number to check
 647 *
 648 * Implements sequence number algorithm as specified in
 649 * RFC 2203, Section 5.3.3.1. "Context Management".
 650 *
 651 * Return values:
 652 *   %true: @rqstp's GSS sequence number is inside the window
 653 *   %false: @rqstp's GSS sequence number is outside the window
 654 */
 655static bool gss_check_seq_num(const struct svc_rqst *rqstp, struct rsc *rsci,
 656			      u32 seq_num)
 657{
 658	struct gss_svc_seq_data *sd = &rsci->seqdata;
 659	bool result = false;
 660
 661	spin_lock(&sd->sd_lock);
 662	if (seq_num > sd->sd_max) {
 663		if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
 664			memset(sd->sd_win, 0, sizeof(sd->sd_win));
 665			sd->sd_max = seq_num;
 666		} else while (sd->sd_max < seq_num) {
 667			sd->sd_max++;
 668			__clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
 669		}
 670		__set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
 671		goto ok;
 672	} else if (seq_num + GSS_SEQ_WIN <= sd->sd_max) {
 673		goto toolow;
 674	}
 675	if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
 676		goto alreadyseen;
 677
 678ok:
 679	result = true;
 680out:
 681	spin_unlock(&sd->sd_lock);
 682	return result;
 683
 684toolow:
 685	trace_rpcgss_svc_seqno_low(rqstp, seq_num,
 686				   sd->sd_max - GSS_SEQ_WIN,
 687				   sd->sd_max);
 688	goto out;
 689alreadyseen:
 690	trace_rpcgss_svc_seqno_seen(rqstp, seq_num);
 691	goto out;
 692}
 693
 694/*
 695 * Decode and verify a Call's verifier field. For RPC_AUTH_GSS Calls,
 696 * the body of this field contains a variable length checksum.
 697 *
 698 * GSS-specific auth_stat values are mandated by RFC 2203 Section
 699 * 5.3.3.3.
 700 */
 701static int
 702svcauth_gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
 703			  __be32 *rpcstart, struct rpc_gss_wire_cred *gc)
 704{
 705	struct xdr_stream	*xdr = &rqstp->rq_arg_stream;
 706	struct gss_ctx		*ctx_id = rsci->mechctx;
 707	u32			flavor, maj_stat;
 708	struct xdr_buf		rpchdr;
 709	struct xdr_netobj	checksum;
 710	struct kvec		iov;
 711
 712	/*
 713	 * Compute the checksum of the incoming Call from the
 714	 * XID field to credential field:
 715	 */
 716	iov.iov_base = rpcstart;
 717	iov.iov_len = (u8 *)xdr->p - (u8 *)rpcstart;
 718	xdr_buf_from_iov(&iov, &rpchdr);
 719
 720	/* Call's verf field: */
 721	if (xdr_stream_decode_opaque_auth(xdr, &flavor,
 722					  (void **)&checksum.data,
 723					  &checksum.len) < 0) {
 724		rqstp->rq_auth_stat = rpc_autherr_badverf;
 725		return SVC_DENIED;
 726	}
 727	if (flavor != RPC_AUTH_GSS || checksum.len < XDR_UNIT) {
 728		rqstp->rq_auth_stat = rpc_autherr_badverf;
 729		return SVC_DENIED;
 730	}
 731
 732	if (rqstp->rq_deferred)
 733		return SVC_OK;
 734	maj_stat = gss_verify_mic(ctx_id, &rpchdr, &checksum);
 735	if (maj_stat != GSS_S_COMPLETE) {
 736		trace_rpcgss_svc_mic(rqstp, maj_stat);
 737		rqstp->rq_auth_stat = rpcsec_gsserr_credproblem;
 738		return SVC_DENIED;
 739	}
 740
 741	if (gc->gc_seq > MAXSEQ) {
 742		trace_rpcgss_svc_seqno_large(rqstp, gc->gc_seq);
 743		rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem;
 744		return SVC_DENIED;
 745	}
 746	if (!gss_check_seq_num(rqstp, rsci, gc->gc_seq))
 747		return SVC_DROP;
 748	return SVC_OK;
 749}
 750
 751/*
 752 * Construct and encode a Reply's verifier field. The verifier's body
 753 * field contains a variable-length checksum of the GSS sequence
 754 * number.
 755 */
 756static bool
 757svcauth_gss_encode_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
 758{
 759	struct gss_svc_data	*gsd = rqstp->rq_auth_data;
 760	u32			maj_stat;
 761	struct xdr_buf		verf_data;
 762	struct xdr_netobj	checksum;
 763	struct kvec		iov;
 764
 765	gsd->gsd_seq_num = cpu_to_be32(seq);
 766	iov.iov_base = &gsd->gsd_seq_num;
 767	iov.iov_len = XDR_UNIT;
 768	xdr_buf_from_iov(&iov, &verf_data);
 769
 770	checksum.data = gsd->gsd_scratch;
 771	maj_stat = gss_get_mic(ctx_id, &verf_data, &checksum);
 772	if (maj_stat != GSS_S_COMPLETE)
 773		goto bad_mic;
 774
 775	return xdr_stream_encode_opaque_auth(&rqstp->rq_res_stream, RPC_AUTH_GSS,
 776					     checksum.data, checksum.len) > 0;
 777
 778bad_mic:
 779	trace_rpcgss_svc_get_mic(rqstp, maj_stat);
 780	return false;
 781}
 782
 783struct gss_domain {
 784	struct auth_domain	h;
 785	u32			pseudoflavor;
 786};
 787
 788static struct auth_domain *
 789find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
 790{
 791	char *name;
 792
 793	name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
 794	if (!name)
 795		return NULL;
 796	return auth_domain_find(name);
 797}
 798
 799static struct auth_ops svcauthops_gss;
 800
 801u32 svcauth_gss_flavor(struct auth_domain *dom)
 802{
 803	struct gss_domain *gd = container_of(dom, struct gss_domain, h);
 804
 805	return gd->pseudoflavor;
 806}
 807
 808EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
 809
 810struct auth_domain *
 811svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
 812{
 813	struct gss_domain	*new;
 814	struct auth_domain	*test;
 815	int			stat = -ENOMEM;
 816
 817	new = kmalloc(sizeof(*new), GFP_KERNEL);
 818	if (!new)
 819		goto out;
 820	kref_init(&new->h.ref);
 821	new->h.name = kstrdup(name, GFP_KERNEL);
 822	if (!new->h.name)
 823		goto out_free_dom;
 824	new->h.flavour = &svcauthops_gss;
 825	new->pseudoflavor = pseudoflavor;
 826
 827	test = auth_domain_lookup(name, &new->h);
 828	if (test != &new->h) {
 829		pr_warn("svc: duplicate registration of gss pseudo flavour %s.\n",
 830			name);
 831		stat = -EADDRINUSE;
 832		auth_domain_put(test);
 833		goto out_free_name;
 834	}
 835	return test;
 836
 837out_free_name:
 838	kfree(new->h.name);
 839out_free_dom:
 840	kfree(new);
 841out:
 842	return ERR_PTR(stat);
 843}
 844EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
 845
 846/*
 847 * RFC 2203, Section 5.3.2.2
 848 *
 849 *	struct rpc_gss_integ_data {
 850 *		opaque databody_integ<>;
 851 *		opaque checksum<>;
 852 *	};
 853 *
 854 *	struct rpc_gss_data_t {
 855 *		unsigned int seq_num;
 856 *		proc_req_arg_t arg;
 857 *	};
 858 */
 859static noinline_for_stack int
 860svcauth_gss_unwrap_integ(struct svc_rqst *rqstp, u32 seq, struct gss_ctx *ctx)
 861{
 862	struct gss_svc_data *gsd = rqstp->rq_auth_data;
 863	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 864	u32 len, offset, seq_num, maj_stat;
 865	struct xdr_buf *buf = xdr->buf;
 866	struct xdr_buf databody_integ;
 867	struct xdr_netobj checksum;
 868
 869	/* Did we already verify the signature on the original pass through? */
 870	if (rqstp->rq_deferred)
 871		return 0;
 872
 873	if (xdr_stream_decode_u32(xdr, &len) < 0)
 874		goto unwrap_failed;
 875	if (len & 3)
 876		goto unwrap_failed;
 877	offset = xdr_stream_pos(xdr);
 878	if (xdr_buf_subsegment(buf, &databody_integ, offset, len))
 879		goto unwrap_failed;
 880
 881	/*
 882	 * The xdr_stream now points to the @seq_num field. The next
 883	 * XDR data item is the @arg field, which contains the clear
 884	 * text RPC program payload. The checksum, which follows the
 885	 * @arg field, is located and decoded without updating the
 886	 * xdr_stream.
 887	 */
 888
 889	offset += len;
 890	if (xdr_decode_word(buf, offset, &checksum.len))
 891		goto unwrap_failed;
 892	if (checksum.len > sizeof(gsd->gsd_scratch))
 893		goto unwrap_failed;
 894	checksum.data = gsd->gsd_scratch;
 895	if (read_bytes_from_xdr_buf(buf, offset + XDR_UNIT, checksum.data,
 896				    checksum.len))
 897		goto unwrap_failed;
 898
 899	maj_stat = gss_verify_mic(ctx, &databody_integ, &checksum);
 900	if (maj_stat != GSS_S_COMPLETE)
 901		goto bad_mic;
 902
 903	/* The received seqno is protected by the checksum. */
 904	if (xdr_stream_decode_u32(xdr, &seq_num) < 0)
 905		goto unwrap_failed;
 906	if (seq_num != seq)
 907		goto bad_seqno;
 908
 909	xdr_truncate_decode(xdr, XDR_UNIT + checksum.len);
 910	return 0;
 911
 912unwrap_failed:
 913	trace_rpcgss_svc_unwrap_failed(rqstp);
 914	return -EINVAL;
 915bad_seqno:
 916	trace_rpcgss_svc_seqno_bad(rqstp, seq, seq_num);
 917	return -EINVAL;
 918bad_mic:
 919	trace_rpcgss_svc_mic(rqstp, maj_stat);
 920	return -EINVAL;
 921}
 922
 923/*
 924 * RFC 2203, Section 5.3.2.3
 925 *
 926 *	struct rpc_gss_priv_data {
 927 *		opaque databody_priv<>
 928 *	};
 929 *
 930 *	struct rpc_gss_data_t {
 931 *		unsigned int seq_num;
 932 *		proc_req_arg_t arg;
 933 *	};
 934 */
 935static noinline_for_stack int
 936svcauth_gss_unwrap_priv(struct svc_rqst *rqstp, u32 seq, struct gss_ctx *ctx)
 937{
 938	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 939	u32 len, maj_stat, seq_num, offset;
 940	struct xdr_buf *buf = xdr->buf;
 941	unsigned int saved_len;
 942
 943	if (xdr_stream_decode_u32(xdr, &len) < 0)
 944		goto unwrap_failed;
 945	if (rqstp->rq_deferred) {
 946		/* Already decrypted last time through! The sequence number
 947		 * check at out_seq is unnecessary but harmless: */
 948		goto out_seq;
 949	}
 950	if (len > xdr_stream_remaining(xdr))
 951		goto unwrap_failed;
 952	offset = xdr_stream_pos(xdr);
 953
 954	saved_len = buf->len;
 955	maj_stat = gss_unwrap(ctx, offset, offset + len, buf);
 956	if (maj_stat != GSS_S_COMPLETE)
 957		goto bad_unwrap;
 958	xdr->nwords -= XDR_QUADLEN(saved_len - buf->len);
 959
 960out_seq:
 961	/* gss_unwrap() decrypted the sequence number. */
 962	if (xdr_stream_decode_u32(xdr, &seq_num) < 0)
 963		goto unwrap_failed;
 964	if (seq_num != seq)
 965		goto bad_seqno;
 966	return 0;
 967
 968unwrap_failed:
 969	trace_rpcgss_svc_unwrap_failed(rqstp);
 970	return -EINVAL;
 971bad_seqno:
 972	trace_rpcgss_svc_seqno_bad(rqstp, seq, seq_num);
 973	return -EINVAL;
 974bad_unwrap:
 975	trace_rpcgss_svc_unwrap(rqstp, maj_stat);
 976	return -EINVAL;
 977}
 978
 979static enum svc_auth_status
 980svcauth_gss_set_client(struct svc_rqst *rqstp)
 981{
 982	struct gss_svc_data *svcdata = rqstp->rq_auth_data;
 983	struct rsc *rsci = svcdata->rsci;
 984	struct rpc_gss_wire_cred *gc = &svcdata->clcred;
 985	int stat;
 986
 987	rqstp->rq_auth_stat = rpc_autherr_badcred;
 988
 989	/*
 990	 * A gss export can be specified either by:
 991	 * 	export	*(sec=krb5,rw)
 992	 * or by
 993	 * 	export gss/krb5(rw)
 994	 * The latter is deprecated; but for backwards compatibility reasons
 995	 * the nfsd code will still fall back on trying it if the former
 996	 * doesn't work; so we try to make both available to nfsd, below.
 997	 */
 998	rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
 999	if (rqstp->rq_gssclient == NULL)
1000		return SVC_DENIED;
1001	stat = svcauth_unix_set_client(rqstp);
1002	if (stat == SVC_DROP || stat == SVC_CLOSE)
1003		return stat;
1004
1005	rqstp->rq_auth_stat = rpc_auth_ok;
1006	return SVC_OK;
1007}
1008
1009static bool
1010svcauth_gss_proc_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
1011			   struct xdr_netobj *out_handle, int *major_status,
1012			   u32 seq_num)
1013{
1014	struct xdr_stream *xdr = &rqstp->rq_res_stream;
1015	struct rsc *rsci;
1016	bool rc;
1017
1018	if (*major_status != GSS_S_COMPLETE)
1019		goto null_verifier;
1020	rsci = gss_svc_searchbyctx(cd, out_handle);
1021	if (rsci == NULL) {
1022		*major_status = GSS_S_NO_CONTEXT;
1023		goto null_verifier;
1024	}
1025
1026	rc = svcauth_gss_encode_verf(rqstp, rsci->mechctx, seq_num);
1027	cache_put(&rsci->h, cd);
1028	return rc;
1029
1030null_verifier:
1031	return xdr_stream_encode_opaque_auth(xdr, RPC_AUTH_NULL, NULL, 0) > 0;
1032}
1033
1034static void gss_free_in_token_pages(struct gssp_in_token *in_token)
1035{
1036	int i;
1037
1038	i = 0;
1039	while (in_token->pages[i])
1040		put_page(in_token->pages[i++]);
1041	kfree(in_token->pages);
1042	in_token->pages = NULL;
1043}
1044
1045static int gss_read_proxy_verf(struct svc_rqst *rqstp,
1046			       struct rpc_gss_wire_cred *gc,
1047			       struct xdr_netobj *in_handle,
1048			       struct gssp_in_token *in_token)
1049{
1050	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
1051	unsigned int length, pgto_offs, pgfrom_offs;
1052	int pages, i, pgto, pgfrom;
1053	size_t to_offs, from_offs;
1054	u32 inlen;
1055
1056	if (dup_netobj(in_handle, &gc->gc_ctx))
1057		return SVC_CLOSE;
1058
1059	/*
1060	 *  RFC 2203 Section 5.2.2
1061	 *
1062	 *	struct rpc_gss_init_arg {
1063	 *		opaque gss_token<>;
1064	 *	};
1065	 */
1066	if (xdr_stream_decode_u32(xdr, &inlen) < 0)
1067		goto out_denied_free;
1068	if (inlen > xdr_stream_remaining(xdr))
1069		goto out_denied_free;
1070
1071	pages = DIV_ROUND_UP(inlen, PAGE_SIZE);
1072	in_token->pages = kcalloc(pages + 1, sizeof(struct page *), GFP_KERNEL);
1073	if (!in_token->pages)
1074		goto out_denied_free;
1075	in_token->page_base = 0;
1076	in_token->page_len = inlen;
1077	for (i = 0; i < pages; i++) {
1078		in_token->pages[i] = alloc_page(GFP_KERNEL);
1079		if (!in_token->pages[i]) {
1080			gss_free_in_token_pages(in_token);
1081			goto out_denied_free;
1082		}
1083	}
1084
1085	length = min_t(unsigned int, inlen, (char *)xdr->end - (char *)xdr->p);
1086	if (length)
1087		memcpy(page_address(in_token->pages[0]), xdr->p, length);
1088	inlen -= length;
1089
1090	to_offs = length;
1091	from_offs = rqstp->rq_arg.page_base;
1092	while (inlen) {
1093		pgto = to_offs >> PAGE_SHIFT;
1094		pgfrom = from_offs >> PAGE_SHIFT;
1095		pgto_offs = to_offs & ~PAGE_MASK;
1096		pgfrom_offs = from_offs & ~PAGE_MASK;
1097
1098		length = min_t(unsigned int, inlen,
1099			 min_t(unsigned int, PAGE_SIZE - pgto_offs,
1100			       PAGE_SIZE - pgfrom_offs));
1101		memcpy(page_address(in_token->pages[pgto]) + pgto_offs,
1102		       page_address(rqstp->rq_arg.pages[pgfrom]) + pgfrom_offs,
1103		       length);
1104
1105		to_offs += length;
1106		from_offs += length;
1107		inlen -= length;
1108	}
1109	return 0;
1110
1111out_denied_free:
1112	kfree(in_handle->data);
1113	return SVC_DENIED;
1114}
1115
1116/*
1117 * RFC 2203, Section 5.2.3.1.
1118 *
1119 *	struct rpc_gss_init_res {
1120 *		opaque handle<>;
1121 *		unsigned int gss_major;
1122 *		unsigned int gss_minor;
1123 *		unsigned int seq_window;
1124 *		opaque gss_token<>;
1125 *	};
1126 */
1127static bool
1128svcxdr_encode_gss_init_res(struct xdr_stream *xdr,
1129			   struct xdr_netobj *handle,
1130			   struct xdr_netobj *gss_token,
1131			   unsigned int major_status,
1132			   unsigned int minor_status, u32 seq_num)
1133{
1134	if (xdr_stream_encode_opaque(xdr, handle->data, handle->len) < 0)
1135		return false;
1136	if (xdr_stream_encode_u32(xdr, major_status) < 0)
1137		return false;
1138	if (xdr_stream_encode_u32(xdr, minor_status) < 0)
1139		return false;
1140	if (xdr_stream_encode_u32(xdr, seq_num) < 0)
1141		return false;
1142	if (xdr_stream_encode_opaque(xdr, gss_token->data, gss_token->len) < 0)
1143		return false;
1144	return true;
1145}
1146
1147/*
1148 * Having read the cred already and found we're in the context
1149 * initiation case, read the verifier and initiate (or check the results
1150 * of) upcalls to userspace for help with context initiation.  If
1151 * the upcall results are available, write the verifier and result.
1152 * Otherwise, drop the request pending an answer to the upcall.
1153 */
1154static int
1155svcauth_gss_legacy_init(struct svc_rqst *rqstp,
1156			struct rpc_gss_wire_cred *gc)
1157{
1158	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
1159	struct rsi *rsip, rsikey;
1160	__be32 *p;
1161	u32 len;
1162	int ret;
1163	struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1164
1165	memset(&rsikey, 0, sizeof(rsikey));
1166	if (dup_netobj(&rsikey.in_handle, &gc->gc_ctx))
1167		return SVC_CLOSE;
1168
1169	/*
1170	 *  RFC 2203 Section 5.2.2
1171	 *
1172	 *	struct rpc_gss_init_arg {
1173	 *		opaque gss_token<>;
1174	 *	};
1175	 */
1176	if (xdr_stream_decode_u32(xdr, &len) < 0) {
1177		kfree(rsikey.in_handle.data);
1178		return SVC_DENIED;
1179	}
1180	p = xdr_inline_decode(xdr, len);
1181	if (!p) {
1182		kfree(rsikey.in_handle.data);
1183		return SVC_DENIED;
1184	}
1185	rsikey.in_token.data = kmalloc(len, GFP_KERNEL);
1186	if (ZERO_OR_NULL_PTR(rsikey.in_token.data)) {
1187		kfree(rsikey.in_handle.data);
1188		return SVC_CLOSE;
1189	}
1190	memcpy(rsikey.in_token.data, p, len);
1191	rsikey.in_token.len = len;
1192
1193	/* Perform upcall, or find upcall result: */
1194	rsip = rsi_lookup(sn->rsi_cache, &rsikey);
1195	rsi_free(&rsikey);
1196	if (!rsip)
1197		return SVC_CLOSE;
1198	if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
1199		/* No upcall result: */
1200		return SVC_CLOSE;
1201
1202	ret = SVC_CLOSE;
1203	if (!svcauth_gss_proc_init_verf(sn->rsc_cache, rqstp, &rsip->out_handle,
1204					&rsip->major_status, GSS_SEQ_WIN))
1205		goto out;
1206	if (!svcxdr_set_accept_stat(rqstp))
1207		goto out;
1208	if (!svcxdr_encode_gss_init_res(&rqstp->rq_res_stream, &rsip->out_handle,
1209					&rsip->out_token, rsip->major_status,
1210					rsip->minor_status, GSS_SEQ_WIN))
1211		goto out;
1212
1213	ret = SVC_COMPLETE;
1214out:
1215	cache_put(&rsip->h, sn->rsi_cache);
1216	return ret;
1217}
1218
1219static int gss_proxy_save_rsc(struct cache_detail *cd,
1220				struct gssp_upcall_data *ud,
1221				uint64_t *handle)
1222{
1223	struct rsc rsci, *rscp = NULL;
1224	static atomic64_t ctxhctr;
1225	long long ctxh;
1226	struct gss_api_mech *gm = NULL;
1227	time64_t expiry;
1228	int status;
1229
1230	memset(&rsci, 0, sizeof(rsci));
1231	/* context handle */
1232	status = -ENOMEM;
1233	/* the handle needs to be just a unique id,
1234	 * use a static counter */
1235	ctxh = atomic64_inc_return(&ctxhctr);
1236
1237	/* make a copy for the caller */
1238	*handle = ctxh;
1239
1240	/* make a copy for the rsc cache */
1241	if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t)))
1242		goto out;
1243	rscp = rsc_lookup(cd, &rsci);
1244	if (!rscp)
1245		goto out;
1246
1247	/* creds */
1248	if (!ud->found_creds) {
1249		/* userspace seem buggy, we should always get at least a
1250		 * mapping to nobody */
1251		goto out;
1252	} else {
1253		struct timespec64 boot;
1254
1255		/* steal creds */
1256		rsci.cred = ud->creds;
1257		memset(&ud->creds, 0, sizeof(struct svc_cred));
1258
1259		status = -EOPNOTSUPP;
1260		/* get mech handle from OID */
1261		gm = gss_mech_get_by_OID(&ud->mech_oid);
1262		if (!gm)
1263			goto out;
1264		rsci.cred.cr_gss_mech = gm;
1265
1266		status = -EINVAL;
1267		/* mech-specific data: */
1268		status = gss_import_sec_context(ud->out_handle.data,
1269						ud->out_handle.len,
1270						gm, &rsci.mechctx,
1271						&expiry, GFP_KERNEL);
1272		if (status)
1273			goto out;
1274
1275		getboottime64(&boot);
1276		expiry -= boot.tv_sec;
1277	}
1278
1279	rsci.h.expiry_time = expiry;
1280	rscp = rsc_update(cd, &rsci, rscp);
1281	status = 0;
1282out:
1283	rsc_free(&rsci);
1284	if (rscp)
1285		cache_put(&rscp->h, cd);
1286	else
1287		status = -ENOMEM;
1288	return status;
1289}
1290
1291static int svcauth_gss_proxy_init(struct svc_rqst *rqstp,
1292				  struct rpc_gss_wire_cred *gc)
1293{
1294	struct xdr_netobj cli_handle;
1295	struct gssp_upcall_data ud;
1296	uint64_t handle;
1297	int status;
1298	int ret;
1299	struct net *net = SVC_NET(rqstp);
1300	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1301
1302	memset(&ud, 0, sizeof(ud));
1303	ret = gss_read_proxy_verf(rqstp, gc, &ud.in_handle, &ud.in_token);
1304	if (ret)
1305		return ret;
1306
1307	ret = SVC_CLOSE;
1308
1309	/* Perform synchronous upcall to gss-proxy */
1310	status = gssp_accept_sec_context_upcall(net, &ud);
1311	if (status)
1312		goto out;
1313
1314	trace_rpcgss_svc_accept_upcall(rqstp, ud.major_status, ud.minor_status);
1315
1316	switch (ud.major_status) {
1317	case GSS_S_CONTINUE_NEEDED:
1318		cli_handle = ud.out_handle;
1319		break;
1320	case GSS_S_COMPLETE:
1321		status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle);
1322		if (status)
1323			goto out;
1324		cli_handle.data = (u8 *)&handle;
1325		cli_handle.len = sizeof(handle);
1326		break;
1327	default:
1328		goto out;
1329	}
1330
1331	if (!svcauth_gss_proc_init_verf(sn->rsc_cache, rqstp, &cli_handle,
1332					&ud.major_status, GSS_SEQ_WIN))
1333		goto out;
1334	if (!svcxdr_set_accept_stat(rqstp))
1335		goto out;
1336	if (!svcxdr_encode_gss_init_res(&rqstp->rq_res_stream, &cli_handle,
1337					&ud.out_token, ud.major_status,
1338					ud.minor_status, GSS_SEQ_WIN))
1339		goto out;
1340
1341	ret = SVC_COMPLETE;
1342out:
1343	gss_free_in_token_pages(&ud.in_token);
1344	gssp_free_upcall_data(&ud);
1345	return ret;
1346}
1347
1348/*
1349 * Try to set the sn->use_gss_proxy variable to a new value. We only allow
1350 * it to be changed if it's currently undefined (-1). If it's any other value
1351 * then return -EBUSY unless the type wouldn't have changed anyway.
1352 */
1353static int set_gss_proxy(struct net *net, int type)
1354{
1355	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1356	int ret;
1357
1358	WARN_ON_ONCE(type != 0 && type != 1);
1359	ret = cmpxchg(&sn->use_gss_proxy, -1, type);
1360	if (ret != -1 && ret != type)
1361		return -EBUSY;
1362	return 0;
1363}
1364
1365static bool use_gss_proxy(struct net *net)
1366{
1367	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1368
1369	/* If use_gss_proxy is still undefined, then try to disable it */
1370	if (sn->use_gss_proxy == -1)
1371		set_gss_proxy(net, 0);
1372	return sn->use_gss_proxy;
1373}
1374
1375static noinline_for_stack int
1376svcauth_gss_proc_init(struct svc_rqst *rqstp, struct rpc_gss_wire_cred *gc)
1377{
1378	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
1379	u32 flavor, len;
1380	void *body;
1381
1382	/* Call's verf field: */
1383	if (xdr_stream_decode_opaque_auth(xdr, &flavor, &body, &len) < 0)
1384		return SVC_GARBAGE;
1385	if (flavor != RPC_AUTH_NULL || len != 0) {
1386		rqstp->rq_auth_stat = rpc_autherr_badverf;
1387		return SVC_DENIED;
1388	}
1389
1390	if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) {
1391		rqstp->rq_auth_stat = rpc_autherr_badcred;
1392		return SVC_DENIED;
1393	}
1394
1395	if (!use_gss_proxy(SVC_NET(rqstp)))
1396		return svcauth_gss_legacy_init(rqstp, gc);
1397	return svcauth_gss_proxy_init(rqstp, gc);
1398}
1399
1400#ifdef CONFIG_PROC_FS
1401
1402static ssize_t write_gssp(struct file *file, const char __user *buf,
1403			 size_t count, loff_t *ppos)
1404{
1405	struct net *net = pde_data(file_inode(file));
1406	char tbuf[20];
1407	unsigned long i;
1408	int res;
1409
1410	if (*ppos || count > sizeof(tbuf)-1)
1411		return -EINVAL;
1412	if (copy_from_user(tbuf, buf, count))
1413		return -EFAULT;
1414
1415	tbuf[count] = 0;
1416	res = kstrtoul(tbuf, 0, &i);
1417	if (res)
1418		return res;
1419	if (i != 1)
1420		return -EINVAL;
1421	res = set_gssp_clnt(net);
1422	if (res)
1423		return res;
1424	res = set_gss_proxy(net, 1);
1425	if (res)
1426		return res;
1427	return count;
1428}
1429
1430static ssize_t read_gssp(struct file *file, char __user *buf,
1431			 size_t count, loff_t *ppos)
1432{
1433	struct net *net = pde_data(file_inode(file));
1434	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1435	unsigned long p = *ppos;
1436	char tbuf[10];
1437	size_t len;
1438
1439	snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy);
1440	len = strlen(tbuf);
1441	if (p >= len)
1442		return 0;
1443	len -= p;
1444	if (len > count)
1445		len = count;
1446	if (copy_to_user(buf, (void *)(tbuf+p), len))
1447		return -EFAULT;
1448	*ppos += len;
1449	return len;
1450}
1451
1452static const struct proc_ops use_gss_proxy_proc_ops = {
1453	.proc_open	= nonseekable_open,
1454	.proc_write	= write_gssp,
1455	.proc_read	= read_gssp,
1456};
1457
1458static int create_use_gss_proxy_proc_entry(struct net *net)
1459{
1460	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1461	struct proc_dir_entry **p = &sn->use_gssp_proc;
1462
1463	sn->use_gss_proxy = -1;
1464	*p = proc_create_data("use-gss-proxy", S_IFREG | 0600,
1465			      sn->proc_net_rpc,
1466			      &use_gss_proxy_proc_ops, net);
1467	if (!*p)
1468		return -ENOMEM;
1469	init_gssp_clnt(sn);
1470	return 0;
1471}
1472
1473static void destroy_use_gss_proxy_proc_entry(struct net *net)
1474{
1475	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1476
1477	if (sn->use_gssp_proc) {
1478		remove_proc_entry("use-gss-proxy", sn->proc_net_rpc);
1479		clear_gssp_clnt(sn);
1480	}
1481}
1482
1483static ssize_t read_gss_krb5_enctypes(struct file *file, char __user *buf,
1484				      size_t count, loff_t *ppos)
1485{
1486	struct rpcsec_gss_oid oid = {
1487		.len	= 9,
1488		.data	= "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02",
1489	};
1490	struct gss_api_mech *mech;
1491	ssize_t ret;
1492
1493	mech = gss_mech_get_by_OID(&oid);
1494	if (!mech)
1495		return 0;
1496	if (!mech->gm_upcall_enctypes) {
1497		gss_mech_put(mech);
1498		return 0;
1499	}
1500
1501	ret = simple_read_from_buffer(buf, count, ppos,
1502				      mech->gm_upcall_enctypes,
1503				      strlen(mech->gm_upcall_enctypes));
1504	gss_mech_put(mech);
1505	return ret;
1506}
1507
1508static const struct proc_ops gss_krb5_enctypes_proc_ops = {
1509	.proc_open	= nonseekable_open,
1510	.proc_read	= read_gss_krb5_enctypes,
1511};
1512
1513static int create_krb5_enctypes_proc_entry(struct net *net)
1514{
1515	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1516
1517	sn->gss_krb5_enctypes =
1518		proc_create_data("gss_krb5_enctypes", S_IFREG | 0444,
1519				 sn->proc_net_rpc, &gss_krb5_enctypes_proc_ops,
1520				 net);
1521	return sn->gss_krb5_enctypes ? 0 : -ENOMEM;
1522}
1523
1524static void destroy_krb5_enctypes_proc_entry(struct net *net)
1525{
1526	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1527
1528	if (sn->gss_krb5_enctypes)
1529		remove_proc_entry("gss_krb5_enctypes", sn->proc_net_rpc);
1530}
1531
1532#else /* CONFIG_PROC_FS */
1533
1534static int create_use_gss_proxy_proc_entry(struct net *net)
1535{
1536	return 0;
1537}
1538
1539static void destroy_use_gss_proxy_proc_entry(struct net *net) {}
1540
1541static int create_krb5_enctypes_proc_entry(struct net *net)
1542{
1543	return 0;
1544}
1545
1546static void destroy_krb5_enctypes_proc_entry(struct net *net) {}
1547
1548#endif /* CONFIG_PROC_FS */
1549
1550/*
1551 * The Call's credential body should contain a struct rpc_gss_cred_t.
1552 *
1553 * RFC 2203 Section 5
1554 *
1555 *	struct rpc_gss_cred_t {
1556 *		union switch (unsigned int version) {
1557 *		case RPCSEC_GSS_VERS_1:
1558 *			struct {
1559 *				rpc_gss_proc_t gss_proc;
1560 *				unsigned int seq_num;
1561 *				rpc_gss_service_t service;
1562 *				opaque handle<>;
1563 *			} rpc_gss_cred_vers_1_t;
1564 *		}
1565 *	};
1566 */
1567static bool
1568svcauth_gss_decode_credbody(struct xdr_stream *xdr,
1569			    struct rpc_gss_wire_cred *gc,
1570			    __be32 **rpcstart)
1571{
1572	ssize_t handle_len;
1573	u32 body_len;
1574	__be32 *p;
1575
1576	p = xdr_inline_decode(xdr, XDR_UNIT);
1577	if (!p)
1578		return false;
1579	/*
1580	 * start of rpc packet is 7 u32's back from here:
1581	 * xid direction rpcversion prog vers proc flavour
1582	 */
1583	*rpcstart = p - 7;
1584	body_len = be32_to_cpup(p);
1585	if (body_len > RPC_MAX_AUTH_SIZE)
1586		return false;
1587
1588	/* struct rpc_gss_cred_t */
1589	if (xdr_stream_decode_u32(xdr, &gc->gc_v) < 0)
1590		return false;
1591	if (xdr_stream_decode_u32(xdr, &gc->gc_proc) < 0)
1592		return false;
1593	if (xdr_stream_decode_u32(xdr, &gc->gc_seq) < 0)
1594		return false;
1595	if (xdr_stream_decode_u32(xdr, &gc->gc_svc) < 0)
1596		return false;
1597	handle_len = xdr_stream_decode_opaque_inline(xdr,
1598						     (void **)&gc->gc_ctx.data,
1599						     body_len);
1600	if (handle_len < 0)
1601		return false;
1602	if (body_len != XDR_UNIT * 5 + xdr_align_size(handle_len))
1603		return false;
1604
1605	gc->gc_ctx.len = handle_len;
1606	return true;
1607}
1608
1609/**
1610 * svcauth_gss_accept - Decode and validate incoming RPC_AUTH_GSS credential
1611 * @rqstp: RPC transaction
1612 *
1613 * Return values:
1614 *   %SVC_OK: Success
1615 *   %SVC_COMPLETE: GSS context lifetime event
1616 *   %SVC_DENIED: Credential or verifier is not valid
1617 *   %SVC_GARBAGE: Failed to decode credential or verifier
1618 *   %SVC_CLOSE: Temporary failure
1619 *
1620 * The rqstp->rq_auth_stat field is also set (see RFCs 2203 and 5531).
1621 */
1622static enum svc_auth_status
1623svcauth_gss_accept(struct svc_rqst *rqstp)
1624{
1625	struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1626	__be32		*rpcstart;
1627	struct rpc_gss_wire_cred *gc;
1628	struct rsc	*rsci = NULL;
1629	int		ret;
1630	struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1631
1632	rqstp->rq_auth_stat = rpc_autherr_failed;
1633	if (!svcdata)
1634		svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
1635	if (!svcdata)
1636		goto auth_err;
1637	rqstp->rq_auth_data = svcdata;
1638	svcdata->gsd_databody_offset = 0;
1639	svcdata->rsci = NULL;
1640	gc = &svcdata->clcred;
1641
1642	rqstp->rq_auth_stat = rpc_autherr_badcred;
1643	if (!svcauth_gss_decode_credbody(&rqstp->rq_arg_stream, gc, &rpcstart))
1644		goto auth_err;
1645	if (gc->gc_v != RPC_GSS_VERSION)
1646		goto auth_err;
1647
1648	switch (gc->gc_proc) {
1649	case RPC_GSS_PROC_INIT:
1650	case RPC_GSS_PROC_CONTINUE_INIT:
1651		if (rqstp->rq_proc != 0)
1652			goto auth_err;
1653		return svcauth_gss_proc_init(rqstp, gc);
1654	case RPC_GSS_PROC_DESTROY:
1655		if (rqstp->rq_proc != 0)
1656			goto auth_err;
1657		fallthrough;
1658	case RPC_GSS_PROC_DATA:
1659		rqstp->rq_auth_stat = rpcsec_gsserr_credproblem;
1660		rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx);
1661		if (!rsci)
1662			goto auth_err;
1663		switch (svcauth_gss_verify_header(rqstp, rsci, rpcstart, gc)) {
1664		case SVC_OK:
1665			break;
1666		case SVC_DENIED:
1667			goto auth_err;
1668		case SVC_DROP:
1669			goto drop;
1670		}
1671		break;
1672	default:
1673		if (rqstp->rq_proc != 0)
1674			goto auth_err;
1675		rqstp->rq_auth_stat = rpc_autherr_rejectedcred;
1676		goto auth_err;
1677	}
1678
1679	/* now act upon the command: */
1680	switch (gc->gc_proc) {
1681	case RPC_GSS_PROC_DESTROY:
1682		if (!svcauth_gss_encode_verf(rqstp, rsci->mechctx, gc->gc_seq))
1683			goto auth_err;
1684		if (!svcxdr_set_accept_stat(rqstp))
1685			goto auth_err;
1686		/* Delete the entry from the cache_list and call cache_put */
1687		sunrpc_cache_unhash(sn->rsc_cache, &rsci->h);
1688		goto complete;
1689	case RPC_GSS_PROC_DATA:
1690		rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem;
1691		if (!svcauth_gss_encode_verf(rqstp, rsci->mechctx, gc->gc_seq))
1692			goto auth_err;
1693		if (!svcxdr_set_accept_stat(rqstp))
1694			goto auth_err;
1695		svcdata->gsd_databody_offset = xdr_stream_pos(&rqstp->rq_res_stream);
1696		rqstp->rq_cred = rsci->cred;
1697		get_group_info(rsci->cred.cr_group_info);
1698		rqstp->rq_auth_stat = rpc_autherr_badcred;
1699		switch (gc->gc_svc) {
1700		case RPC_GSS_SVC_NONE:
1701			break;
1702		case RPC_GSS_SVC_INTEGRITY:
1703			/* placeholders for body length and seq. number: */
1704			xdr_reserve_space(&rqstp->rq_res_stream, XDR_UNIT * 2);
1705			if (svcauth_gss_unwrap_integ(rqstp, gc->gc_seq,
1706						     rsci->mechctx))
1707				goto garbage_args;
1708			svcxdr_set_auth_slack(rqstp, RPC_MAX_AUTH_SIZE);
1709			break;
1710		case RPC_GSS_SVC_PRIVACY:
1711			/* placeholders for body length and seq. number: */
1712			xdr_reserve_space(&rqstp->rq_res_stream, XDR_UNIT * 2);
1713			if (svcauth_gss_unwrap_priv(rqstp, gc->gc_seq,
1714						    rsci->mechctx))
1715				goto garbage_args;
1716			svcxdr_set_auth_slack(rqstp, RPC_MAX_AUTH_SIZE * 2);
1717			break;
1718		default:
1719			goto auth_err;
1720		}
1721		svcdata->rsci = rsci;
1722		cache_get(&rsci->h);
1723		rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
1724					rsci->mechctx->mech_type,
1725					GSS_C_QOP_DEFAULT,
1726					gc->gc_svc);
1727		ret = SVC_OK;
1728		trace_rpcgss_svc_authenticate(rqstp, gc);
1729		goto out;
1730	}
1731garbage_args:
1732	ret = SVC_GARBAGE;
1733	goto out;
1734auth_err:
1735	xdr_truncate_encode(&rqstp->rq_res_stream, XDR_UNIT * 2);
1736	ret = SVC_DENIED;
1737	goto out;
1738complete:
1739	ret = SVC_COMPLETE;
1740	goto out;
1741drop:
1742	ret = SVC_CLOSE;
1743out:
1744	if (rsci)
1745		cache_put(&rsci->h, sn->rsc_cache);
1746	return ret;
1747}
1748
1749static u32
1750svcauth_gss_prepare_to_wrap(struct svc_rqst *rqstp, struct gss_svc_data *gsd)
1751{
1752	u32 offset;
1753
1754	/* Release can be called twice, but we only wrap once. */
1755	offset = gsd->gsd_databody_offset;
1756	gsd->gsd_databody_offset = 0;
1757
1758	/* AUTH_ERROR replies are not wrapped. */
1759	if (rqstp->rq_auth_stat != rpc_auth_ok)
1760		return 0;
1761
1762	/* Also don't wrap if the accept_stat is nonzero: */
1763	if (*rqstp->rq_accept_statp != rpc_success)
1764		return 0;
1765
1766	return offset;
1767}
1768
1769/*
1770 * RFC 2203, Section 5.3.2.2
1771 *
1772 *	struct rpc_gss_integ_data {
1773 *		opaque databody_integ<>;
1774 *		opaque checksum<>;
1775 *	};
1776 *
1777 *	struct rpc_gss_data_t {
1778 *		unsigned int seq_num;
1779 *		proc_req_arg_t arg;
1780 *	};
1781 *
1782 * The RPC Reply message has already been XDR-encoded. rq_res_stream
1783 * is now positioned so that the checksum can be written just past
1784 * the RPC Reply message.
1785 */
1786static int svcauth_gss_wrap_integ(struct svc_rqst *rqstp)
1787{
1788	struct gss_svc_data *gsd = rqstp->rq_auth_data;
1789	struct xdr_stream *xdr = &rqstp->rq_res_stream;
1790	struct rpc_gss_wire_cred *gc = &gsd->clcred;
1791	struct xdr_buf *buf = xdr->buf;
1792	struct xdr_buf databody_integ;
1793	struct xdr_netobj checksum;
1794	u32 offset, maj_stat;
1795
1796	offset = svcauth_gss_prepare_to_wrap(rqstp, gsd);
1797	if (!offset)
1798		goto out;
1799
1800	if (xdr_buf_subsegment(buf, &databody_integ, offset + XDR_UNIT,
1801			       buf->len - offset - XDR_UNIT))
1802		goto wrap_failed;
1803	/* Buffer space for these has already been reserved in
1804	 * svcauth_gss_accept(). */
1805	if (xdr_encode_word(buf, offset, databody_integ.len))
1806		goto wrap_failed;
1807	if (xdr_encode_word(buf, offset + XDR_UNIT, gc->gc_seq))
1808		goto wrap_failed;
1809
1810	checksum.data = gsd->gsd_scratch;
1811	maj_stat = gss_get_mic(gsd->rsci->mechctx, &databody_integ, &checksum);
1812	if (maj_stat != GSS_S_COMPLETE)
1813		goto bad_mic;
1814
1815	if (xdr_stream_encode_opaque(xdr, checksum.data, checksum.len) < 0)
1816		goto wrap_failed;
1817	xdr_commit_encode(xdr);
1818
1819out:
1820	return 0;
1821
1822bad_mic:
1823	trace_rpcgss_svc_get_mic(rqstp, maj_stat);
1824	return -EINVAL;
1825wrap_failed:
1826	trace_rpcgss_svc_wrap_failed(rqstp);
1827	return -EINVAL;
1828}
1829
1830/*
1831 * RFC 2203, Section 5.3.2.3
1832 *
1833 *	struct rpc_gss_priv_data {
1834 *		opaque databody_priv<>
1835 *	};
1836 *
1837 *	struct rpc_gss_data_t {
1838 *		unsigned int seq_num;
1839 *		proc_req_arg_t arg;
1840 *	};
1841 *
1842 * gss_wrap() expands the size of the RPC message payload in the
1843 * response buffer. The main purpose of svcauth_gss_wrap_priv()
1844 * is to ensure there is adequate space in the response buffer to
1845 * avoid overflow during the wrap.
1846 */
1847static int svcauth_gss_wrap_priv(struct svc_rqst *rqstp)
1848{
1849	struct gss_svc_data *gsd = rqstp->rq_auth_data;
1850	struct rpc_gss_wire_cred *gc = &gsd->clcred;
1851	struct xdr_buf *buf = &rqstp->rq_res;
1852	struct kvec *head = buf->head;
1853	struct kvec *tail = buf->tail;
1854	u32 offset, pad, maj_stat;
1855	__be32 *p;
1856
1857	offset = svcauth_gss_prepare_to_wrap(rqstp, gsd);
1858	if (!offset)
1859		return 0;
1860
1861	/*
1862	 * Buffer space for this field has already been reserved
1863	 * in svcauth_gss_accept(). Note that the GSS sequence
1864	 * number is encrypted along with the RPC reply payload.
1865	 */
1866	if (xdr_encode_word(buf, offset + XDR_UNIT, gc->gc_seq))
1867		goto wrap_failed;
1868
1869	/*
1870	 * If there is currently tail data, make sure there is
1871	 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
1872	 * the page, and move the current tail data such that
1873	 * there is RPC_MAX_AUTH_SIZE slack space available in
1874	 * both the head and tail.
1875	 */
1876	if (tail->iov_base) {
1877		if (tail->iov_base >= head->iov_base + PAGE_SIZE)
1878			goto wrap_failed;
1879		if (tail->iov_base < head->iov_base)
1880			goto wrap_failed;
1881		if (tail->iov_len + head->iov_len
1882				+ 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1883			goto wrap_failed;
1884		memmove(tail->iov_base + RPC_MAX_AUTH_SIZE, tail->iov_base,
1885			tail->iov_len);
1886		tail->iov_base += RPC_MAX_AUTH_SIZE;
1887	}
1888	/*
1889	 * If there is no current tail data, make sure there is
1890	 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
1891	 * allotted page, and set up tail information such that there
1892	 * is RPC_MAX_AUTH_SIZE slack space available in both the
1893	 * head and tail.
1894	 */
1895	if (!tail->iov_base) {
1896		if (head->iov_len + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1897			goto wrap_failed;
1898		tail->iov_base = head->iov_base
1899			+ head->iov_len + RPC_MAX_AUTH_SIZE;
1900		tail->iov_len = 0;
1901	}
1902
1903	maj_stat = gss_wrap(gsd->rsci->mechctx, offset + XDR_UNIT, buf,
1904			    buf->pages);
1905	if (maj_stat != GSS_S_COMPLETE)
1906		goto bad_wrap;
1907
1908	/* Wrapping can change the size of databody_priv. */
1909	if (xdr_encode_word(buf, offset, buf->len - offset - XDR_UNIT))
1910		goto wrap_failed;
1911	pad = xdr_pad_size(buf->len - offset - XDR_UNIT);
1912	p = (__be32 *)(tail->iov_base + tail->iov_len);
1913	memset(p, 0, pad);
1914	tail->iov_len += pad;
1915	buf->len += pad;
1916
1917	return 0;
1918wrap_failed:
1919	trace_rpcgss_svc_wrap_failed(rqstp);
1920	return -EINVAL;
1921bad_wrap:
1922	trace_rpcgss_svc_wrap(rqstp, maj_stat);
1923	return -ENOMEM;
1924}
1925
1926/**
1927 * svcauth_gss_release - Wrap payload and release resources
1928 * @rqstp: RPC transaction context
1929 *
1930 * Return values:
1931 *    %0: the Reply is ready to be sent
1932 *    %-ENOMEM: failed to allocate memory
1933 *    %-EINVAL: encoding error
1934 */
1935static int
1936svcauth_gss_release(struct svc_rqst *rqstp)
1937{
1938	struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1939	struct gss_svc_data *gsd = rqstp->rq_auth_data;
1940	struct rpc_gss_wire_cred *gc;
1941	int stat;
1942
1943	if (!gsd)
1944		goto out;
1945	gc = &gsd->clcred;
1946	if (gc->gc_proc != RPC_GSS_PROC_DATA)
1947		goto out;
1948
1949	switch (gc->gc_svc) {
1950	case RPC_GSS_SVC_NONE:
1951		break;
1952	case RPC_GSS_SVC_INTEGRITY:
1953		stat = svcauth_gss_wrap_integ(rqstp);
1954		if (stat)
1955			goto out_err;
1956		break;
1957	case RPC_GSS_SVC_PRIVACY:
1958		stat = svcauth_gss_wrap_priv(rqstp);
1959		if (stat)
1960			goto out_err;
1961		break;
1962	/*
1963	 * For any other gc_svc value, svcauth_gss_accept() already set
1964	 * the auth_error appropriately; just fall through:
1965	 */
1966	}
1967
1968out:
1969	stat = 0;
1970out_err:
1971	if (rqstp->rq_client)
1972		auth_domain_put(rqstp->rq_client);
1973	rqstp->rq_client = NULL;
1974	if (rqstp->rq_gssclient)
1975		auth_domain_put(rqstp->rq_gssclient);
1976	rqstp->rq_gssclient = NULL;
1977	if (rqstp->rq_cred.cr_group_info)
1978		put_group_info(rqstp->rq_cred.cr_group_info);
1979	rqstp->rq_cred.cr_group_info = NULL;
1980	if (gsd && gsd->rsci) {
1981		cache_put(&gsd->rsci->h, sn->rsc_cache);
1982		gsd->rsci = NULL;
1983	}
1984	return stat;
1985}
1986
1987static void
1988svcauth_gss_domain_release_rcu(struct rcu_head *head)
1989{
1990	struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
1991	struct gss_domain *gd = container_of(dom, struct gss_domain, h);
1992
1993	kfree(dom->name);
1994	kfree(gd);
1995}
1996
1997static void
1998svcauth_gss_domain_release(struct auth_domain *dom)
1999{
2000	call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu);
2001}
2002
2003static rpc_authflavor_t svcauth_gss_pseudoflavor(struct svc_rqst *rqstp)
2004{
2005	return svcauth_gss_flavor(rqstp->rq_gssclient);
2006}
2007
2008static struct auth_ops svcauthops_gss = {
2009	.name		= "rpcsec_gss",
2010	.owner		= THIS_MODULE,
2011	.flavour	= RPC_AUTH_GSS,
2012	.accept		= svcauth_gss_accept,
2013	.release	= svcauth_gss_release,
2014	.domain_release = svcauth_gss_domain_release,
2015	.set_client	= svcauth_gss_set_client,
2016	.pseudoflavor	= svcauth_gss_pseudoflavor,
2017};
2018
2019static int rsi_cache_create_net(struct net *net)
2020{
2021	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
2022	struct cache_detail *cd;
2023	int err;
2024
2025	cd = cache_create_net(&rsi_cache_template, net);
2026	if (IS_ERR(cd))
2027		return PTR_ERR(cd);
2028	err = cache_register_net(cd, net);
2029	if (err) {
2030		cache_destroy_net(cd, net);
2031		return err;
2032	}
2033	sn->rsi_cache = cd;
2034	return 0;
2035}
2036
2037static void rsi_cache_destroy_net(struct net *net)
2038{
2039	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
2040	struct cache_detail *cd = sn->rsi_cache;
2041
2042	sn->rsi_cache = NULL;
2043	cache_purge(cd);
2044	cache_unregister_net(cd, net);
2045	cache_destroy_net(cd, net);
2046}
2047
2048static int rsc_cache_create_net(struct net *net)
2049{
2050	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
2051	struct cache_detail *cd;
2052	int err;
2053
2054	cd = cache_create_net(&rsc_cache_template, net);
2055	if (IS_ERR(cd))
2056		return PTR_ERR(cd);
2057	err = cache_register_net(cd, net);
2058	if (err) {
2059		cache_destroy_net(cd, net);
2060		return err;
2061	}
2062	sn->rsc_cache = cd;
2063	return 0;
2064}
2065
2066static void rsc_cache_destroy_net(struct net *net)
2067{
2068	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
2069	struct cache_detail *cd = sn->rsc_cache;
2070
2071	sn->rsc_cache = NULL;
2072	cache_purge(cd);
2073	cache_unregister_net(cd, net);
2074	cache_destroy_net(cd, net);
2075}
2076
2077int
2078gss_svc_init_net(struct net *net)
2079{
2080	int rv;
2081
2082	rv = rsc_cache_create_net(net);
2083	if (rv)
2084		return rv;
2085	rv = rsi_cache_create_net(net);
2086	if (rv)
2087		goto out1;
2088	rv = create_use_gss_proxy_proc_entry(net);
2089	if (rv)
2090		goto out2;
2091
2092	rv = create_krb5_enctypes_proc_entry(net);
2093	if (rv)
2094		goto out3;
2095
2096	return 0;
2097
2098out3:
2099	destroy_use_gss_proxy_proc_entry(net);
2100out2:
2101	rsi_cache_destroy_net(net);
2102out1:
2103	rsc_cache_destroy_net(net);
2104	return rv;
2105}
2106
2107void
2108gss_svc_shutdown_net(struct net *net)
2109{
2110	destroy_krb5_enctypes_proc_entry(net);
2111	destroy_use_gss_proxy_proc_entry(net);
2112	rsi_cache_destroy_net(net);
2113	rsc_cache_destroy_net(net);
2114}
2115
2116int
2117gss_svc_init(void)
2118{
2119	return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
2120}
2121
2122void
2123gss_svc_shutdown(void)
2124{
2125	svc_auth_unregister(RPC_AUTH_GSS);
2126}