1/*
   2 * linux/net/sunrpc/auth_gss/auth_gss.c
   3 *
   4 * RPCSEC_GSS client authentication.
   5 *
   6 *  Copyright (c) 2000 The Regents of the University of Michigan.
   7 *  All rights reserved.
   8 *
   9 *  Dug Song       <dugsong@monkey.org>
  10 *  Andy Adamson   <andros@umich.edu>
  11 *
  12 *  Redistribution and use in source and binary forms, with or without
  13 *  modification, are permitted provided that the following conditions
  14 *  are met:
  15 *
  16 *  1. Redistributions of source code must retain the above copyright
  17 *     notice, this list of conditions and the following disclaimer.
  18 *  2. Redistributions in binary form must reproduce the above copyright
  19 *     notice, this list of conditions and the following disclaimer in the
  20 *     documentation and/or other materials provided with the distribution.
  21 *  3. Neither the name of the University nor the names of its
  22 *     contributors may be used to endorse or promote products derived
  23 *     from this software without specific prior written permission.
  24 *
  25 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36 */
  37
  38
  39#include <linux/module.h>
  40#include <linux/init.h>
  41#include <linux/types.h>
  42#include <linux/slab.h>
  43#include <linux/sched.h>
  44#include <linux/pagemap.h>
  45#include <linux/sunrpc/clnt.h>
  46#include <linux/sunrpc/auth.h>
  47#include <linux/sunrpc/auth_gss.h>
  48#include <linux/sunrpc/svcauth_gss.h>
  49#include <linux/sunrpc/gss_err.h>
  50#include <linux/workqueue.h>
  51#include <linux/sunrpc/rpc_pipe_fs.h>
  52#include <linux/sunrpc/gss_api.h>
  53#include <asm/uaccess.h>
  54#include <linux/hashtable.h>
  55
  56#include "../netns.h"
  57
 
 
  58static const struct rpc_authops authgss_ops;
  59
  60static const struct rpc_credops gss_credops;
  61static const struct rpc_credops gss_nullops;
  62
  63#define GSS_RETRY_EXPIRED 5
  64static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED;
  65
  66#define GSS_KEY_EXPIRE_TIMEO 240
  67static unsigned int gss_key_expire_timeo = GSS_KEY_EXPIRE_TIMEO;
  68
  69#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
  70# define RPCDBG_FACILITY	RPCDBG_AUTH
  71#endif
  72
  73#define GSS_CRED_SLACK		(RPC_MAX_AUTH_SIZE * 2)
  74/* length of a krb5 verifier (48), plus data added before arguments when
  75 * using integrity (two 4-byte integers): */
  76#define GSS_VERF_SLACK		100
  77
  78static DEFINE_HASHTABLE(gss_auth_hash_table, 4);
  79static DEFINE_SPINLOCK(gss_auth_hash_lock);
  80
  81struct gss_pipe {
  82	struct rpc_pipe_dir_object pdo;
  83	struct rpc_pipe *pipe;
  84	struct rpc_clnt *clnt;
  85	const char *name;
  86	struct kref kref;
  87};
  88
  89struct gss_auth {
  90	struct kref kref;
  91	struct hlist_node hash;
  92	struct rpc_auth rpc_auth;
  93	struct gss_api_mech *mech;
  94	enum rpc_gss_svc service;
  95	struct rpc_clnt *client;
  96	struct net *net;
  97	/*
  98	 * There are two upcall pipes; dentry[1], named "gssd", is used
  99	 * for the new text-based upcall; dentry[0] is named after the
 100	 * mechanism (for example, "krb5") and exists for
 101	 * backwards-compatibility with older gssd's.
 102	 */
 103	struct gss_pipe *gss_pipe[2];
 104	const char *target_name;
 105};
 106
 107/* pipe_version >= 0 if and only if someone has a pipe open. */
 108static DEFINE_SPINLOCK(pipe_version_lock);
 109static struct rpc_wait_queue pipe_version_rpc_waitqueue;
 110static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue);
 111static void gss_put_auth(struct gss_auth *gss_auth);
 112
 113static void gss_free_ctx(struct gss_cl_ctx *);
 114static const struct rpc_pipe_ops gss_upcall_ops_v0;
 115static const struct rpc_pipe_ops gss_upcall_ops_v1;
 116
 117static inline struct gss_cl_ctx *
 118gss_get_ctx(struct gss_cl_ctx *ctx)
 119{
 120	atomic_inc(&ctx->count);
 121	return ctx;
 122}
 123
 124static inline void
 125gss_put_ctx(struct gss_cl_ctx *ctx)
 126{
 127	if (atomic_dec_and_test(&ctx->count))
 128		gss_free_ctx(ctx);
 129}
 130
 131/* gss_cred_set_ctx:
 132 * called by gss_upcall_callback and gss_create_upcall in order
 133 * to set the gss context. The actual exchange of an old context
 134 * and a new one is protected by the pipe->lock.
 135 */
 136static void
 137gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
 138{
 139	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
 140
 141	if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
 142		return;
 143	gss_get_ctx(ctx);
 144	rcu_assign_pointer(gss_cred->gc_ctx, ctx);
 145	set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
 146	smp_mb__before_atomic();
 147	clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags);
 148}
 149
 150static const void *
 151simple_get_bytes(const void *p, const void *end, void *res, size_t len)
 152{
 153	const void *q = (const void *)((const char *)p + len);
 154	if (unlikely(q > end || q < p))
 155		return ERR_PTR(-EFAULT);
 156	memcpy(res, p, len);
 157	return q;
 158}
 159
 160static inline const void *
 161simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
 162{
 163	const void *q;
 164	unsigned int len;
 165
 166	p = simple_get_bytes(p, end, &len, sizeof(len));
 167	if (IS_ERR(p))
 168		return p;
 169	q = (const void *)((const char *)p + len);
 170	if (unlikely(q > end || q < p))
 171		return ERR_PTR(-EFAULT);
 172	dest->data = kmemdup(p, len, GFP_NOFS);
 173	if (unlikely(dest->data == NULL))
 174		return ERR_PTR(-ENOMEM);
 175	dest->len = len;
 176	return q;
 177}
 178
 179static struct gss_cl_ctx *
 180gss_cred_get_ctx(struct rpc_cred *cred)
 181{
 182	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
 183	struct gss_cl_ctx *ctx = NULL;
 184
 185	rcu_read_lock();
 186	ctx = rcu_dereference(gss_cred->gc_ctx);
 187	if (ctx)
 188		gss_get_ctx(ctx);
 189	rcu_read_unlock();
 190	return ctx;
 191}
 192
 193static struct gss_cl_ctx *
 194gss_alloc_context(void)
 195{
 196	struct gss_cl_ctx *ctx;
 197
 198	ctx = kzalloc(sizeof(*ctx), GFP_NOFS);
 199	if (ctx != NULL) {
 200		ctx->gc_proc = RPC_GSS_PROC_DATA;
 201		ctx->gc_seq = 1;	/* NetApp 6.4R1 doesn't accept seq. no. 0 */
 202		spin_lock_init(&ctx->gc_seq_lock);
 203		atomic_set(&ctx->count,1);
 204	}
 205	return ctx;
 206}
 207
 208#define GSSD_MIN_TIMEOUT (60 * 60)
 209static const void *
 210gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm)
 211{
 212	const void *q;
 213	unsigned int seclen;
 214	unsigned int timeout;
 215	unsigned long now = jiffies;
 216	u32 window_size;
 217	int ret;
 218
 219	/* First unsigned int gives the remaining lifetime in seconds of the
 220	 * credential - e.g. the remaining TGT lifetime for Kerberos or
 221	 * the -t value passed to GSSD.
 222	 */
 223	p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
 224	if (IS_ERR(p))
 225		goto err;
 226	if (timeout == 0)
 227		timeout = GSSD_MIN_TIMEOUT;
 228	ctx->gc_expiry = now + ((unsigned long)timeout * HZ);
 229	/* Sequence number window. Determines the maximum number of
 230	 * simultaneous requests
 231	 */
 232	p = simple_get_bytes(p, end, &window_size, sizeof(window_size));
 233	if (IS_ERR(p))
 234		goto err;
 235	ctx->gc_win = window_size;
 236	/* gssd signals an error by passing ctx->gc_win = 0: */
 237	if (ctx->gc_win == 0) {
 238		/*
 239		 * in which case, p points to an error code. Anything other
 240		 * than -EKEYEXPIRED gets converted to -EACCES.
 241		 */
 242		p = simple_get_bytes(p, end, &ret, sizeof(ret));
 243		if (!IS_ERR(p))
 244			p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) :
 245						    ERR_PTR(-EACCES);
 246		goto err;
 247	}
 248	/* copy the opaque wire context */
 249	p = simple_get_netobj(p, end, &ctx->gc_wire_ctx);
 250	if (IS_ERR(p))
 251		goto err;
 252	/* import the opaque security context */
 253	p  = simple_get_bytes(p, end, &seclen, sizeof(seclen));
 254	if (IS_ERR(p))
 255		goto err;
 256	q = (const void *)((const char *)p + seclen);
 257	if (unlikely(q > end || q < p)) {
 258		p = ERR_PTR(-EFAULT);
 259		goto err;
 260	}
 261	ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS);
 262	if (ret < 0) {
 
 263		p = ERR_PTR(ret);
 264		goto err;
 265	}
 266
 267	/* is there any trailing data? */
 268	if (q == end) {
 269		p = q;
 270		goto done;
 271	}
 272
 273	/* pull in acceptor name (if there is one) */
 274	p = simple_get_netobj(q, end, &ctx->gc_acceptor);
 275	if (IS_ERR(p))
 276		goto err;
 277done:
 278	dprintk("RPC:       %s Success. gc_expiry %lu now %lu timeout %u acceptor %.*s\n",
 279		__func__, ctx->gc_expiry, now, timeout, ctx->gc_acceptor.len,
 280		ctx->gc_acceptor.data);
 281	return p;
 282err:
 283	dprintk("RPC:       %s returns error %ld\n", __func__, -PTR_ERR(p));
 284	return p;
 285}
 286
 287#define UPCALL_BUF_LEN 128
 
 
 
 
 
 288
 289struct gss_upcall_msg {
 290	atomic_t count;
 291	kuid_t	uid;
 
 292	struct rpc_pipe_msg msg;
 293	struct list_head list;
 294	struct gss_auth *auth;
 295	struct rpc_pipe *pipe;
 296	struct rpc_wait_queue rpc_waitqueue;
 297	wait_queue_head_t waitqueue;
 298	struct gss_cl_ctx *ctx;
 299	char databuf[UPCALL_BUF_LEN];
 300};
 301
 302static int get_pipe_version(struct net *net)
 303{
 304	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 305	int ret;
 306
 307	spin_lock(&pipe_version_lock);
 308	if (sn->pipe_version >= 0) {
 309		atomic_inc(&sn->pipe_users);
 310		ret = sn->pipe_version;
 311	} else
 312		ret = -EAGAIN;
 313	spin_unlock(&pipe_version_lock);
 314	return ret;
 315}
 316
 317static void put_pipe_version(struct net *net)
 318{
 319	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 320
 321	if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) {
 322		sn->pipe_version = -1;
 323		spin_unlock(&pipe_version_lock);
 324	}
 325}
 326
 327static void
 328gss_release_msg(struct gss_upcall_msg *gss_msg)
 329{
 330	struct net *net = gss_msg->auth->net;
 331	if (!atomic_dec_and_test(&gss_msg->count))
 332		return;
 333	put_pipe_version(net);
 334	BUG_ON(!list_empty(&gss_msg->list));
 335	if (gss_msg->ctx != NULL)
 336		gss_put_ctx(gss_msg->ctx);
 337	rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue);
 338	gss_put_auth(gss_msg->auth);
 
 339	kfree(gss_msg);
 340}
 341
 342static struct gss_upcall_msg *
 343__gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid)
 344{
 345	struct gss_upcall_msg *pos;
 346	list_for_each_entry(pos, &pipe->in_downcall, list) {
 347		if (!uid_eq(pos->uid, uid))
 348			continue;
 349		atomic_inc(&pos->count);
 350		dprintk("RPC:       %s found msg %p\n", __func__, pos);
 
 351		return pos;
 352	}
 353	dprintk("RPC:       %s found nothing\n", __func__);
 354	return NULL;
 355}
 356
 357/* Try to add an upcall to the pipefs queue.
 358 * If an upcall owned by our uid already exists, then we return a reference
 359 * to that upcall instead of adding the new upcall.
 360 */
 361static inline struct gss_upcall_msg *
 362gss_add_msg(struct gss_upcall_msg *gss_msg)
 363{
 364	struct rpc_pipe *pipe = gss_msg->pipe;
 365	struct gss_upcall_msg *old;
 366
 367	spin_lock(&pipe->lock);
 368	old = __gss_find_upcall(pipe, gss_msg->uid);
 369	if (old == NULL) {
 370		atomic_inc(&gss_msg->count);
 371		list_add(&gss_msg->list, &pipe->in_downcall);
 372	} else
 373		gss_msg = old;
 374	spin_unlock(&pipe->lock);
 375	return gss_msg;
 376}
 377
 378static void
 379__gss_unhash_msg(struct gss_upcall_msg *gss_msg)
 380{
 381	list_del_init(&gss_msg->list);
 382	rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
 383	wake_up_all(&gss_msg->waitqueue);
 384	atomic_dec(&gss_msg->count);
 385}
 386
 387static void
 388gss_unhash_msg(struct gss_upcall_msg *gss_msg)
 389{
 390	struct rpc_pipe *pipe = gss_msg->pipe;
 391
 392	if (list_empty(&gss_msg->list))
 393		return;
 394	spin_lock(&pipe->lock);
 395	if (!list_empty(&gss_msg->list))
 396		__gss_unhash_msg(gss_msg);
 397	spin_unlock(&pipe->lock);
 398}
 399
 400static void
 401gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg)
 402{
 403	switch (gss_msg->msg.errno) {
 404	case 0:
 405		if (gss_msg->ctx == NULL)
 406			break;
 407		clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
 408		gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx);
 409		break;
 410	case -EKEYEXPIRED:
 411		set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
 412	}
 413	gss_cred->gc_upcall_timestamp = jiffies;
 414	gss_cred->gc_upcall = NULL;
 415	rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
 416}
 417
 418static void
 419gss_upcall_callback(struct rpc_task *task)
 420{
 421	struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred,
 422			struct gss_cred, gc_base);
 423	struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
 424	struct rpc_pipe *pipe = gss_msg->pipe;
 425
 426	spin_lock(&pipe->lock);
 427	gss_handle_downcall_result(gss_cred, gss_msg);
 428	spin_unlock(&pipe->lock);
 429	task->tk_status = gss_msg->msg.errno;
 430	gss_release_msg(gss_msg);
 431}
 432
 433static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg)
 
 434{
 435	uid_t uid = from_kuid(&init_user_ns, gss_msg->uid);
 
 
 436	memcpy(gss_msg->databuf, &uid, sizeof(uid));
 437	gss_msg->msg.data = gss_msg->databuf;
 438	gss_msg->msg.len = sizeof(uid);
 439
 440	BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf));
 441}
 442
 
 
 
 
 
 
 
 
 
 
 
 
 443static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
 444				const char *service_name,
 445				const char *target_name)
 
 446{
 
 447	struct gss_api_mech *mech = gss_msg->auth->mech;
 448	char *p = gss_msg->databuf;
 449	size_t buflen = sizeof(gss_msg->databuf);
 450	int len;
 451
 452	len = scnprintf(p, buflen, "mech=%s uid=%d ", mech->gm_name,
 453			from_kuid(&init_user_ns, gss_msg->uid));
 454	buflen -= len;
 455	p += len;
 456	gss_msg->msg.len = len;
 
 
 
 
 
 457	if (target_name) {
 458		len = scnprintf(p, buflen, "target=%s ", target_name);
 459		buflen -= len;
 460		p += len;
 461		gss_msg->msg.len += len;
 462	}
 463	if (service_name != NULL) {
 464		len = scnprintf(p, buflen, "service=%s ", service_name);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 465		buflen -= len;
 466		p += len;
 467		gss_msg->msg.len += len;
 468	}
 
 469	if (mech->gm_upcall_enctypes) {
 470		len = scnprintf(p, buflen, "enctypes=%s ",
 471				mech->gm_upcall_enctypes);
 472		buflen -= len;
 473		p += len;
 474		gss_msg->msg.len += len;
 475	}
 
 476	len = scnprintf(p, buflen, "\n");
 477	if (len == 0)
 478		goto out_overflow;
 479	gss_msg->msg.len += len;
 480
 481	gss_msg->msg.data = gss_msg->databuf;
 482	return 0;
 483out_overflow:
 484	WARN_ON_ONCE(1);
 485	return -ENOMEM;
 486}
 487
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 488static struct gss_upcall_msg *
 489gss_alloc_msg(struct gss_auth *gss_auth,
 490		kuid_t uid, const char *service_name)
 491{
 492	struct gss_upcall_msg *gss_msg;
 493	int vers;
 494	int err = -ENOMEM;
 495
 496	gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS);
 497	if (gss_msg == NULL)
 498		goto err;
 499	vers = get_pipe_version(gss_auth->net);
 500	err = vers;
 501	if (err < 0)
 502		goto err_free_msg;
 503	gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe;
 504	INIT_LIST_HEAD(&gss_msg->list);
 505	rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
 506	init_waitqueue_head(&gss_msg->waitqueue);
 507	atomic_set(&gss_msg->count, 1);
 508	gss_msg->uid = uid;
 509	gss_msg->auth = gss_auth;
 510	switch (vers) {
 511	case 0:
 512		gss_encode_v0_msg(gss_msg);
 513		break;
 514	default:
 515		err = gss_encode_v1_msg(gss_msg, service_name, gss_auth->target_name);
 516		if (err)
 517			goto err_put_pipe_version;
 518	};
 519	kref_get(&gss_auth->kref);
 
 
 
 
 
 
 
 520	return gss_msg;
 521err_put_pipe_version:
 522	put_pipe_version(gss_auth->net);
 523err_free_msg:
 524	kfree(gss_msg);
 525err:
 526	return ERR_PTR(err);
 527}
 528
 529static struct gss_upcall_msg *
 530gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred)
 531{
 532	struct gss_cred *gss_cred = container_of(cred,
 533			struct gss_cred, gc_base);
 534	struct gss_upcall_msg *gss_new, *gss_msg;
 535	kuid_t uid = cred->cr_uid;
 536
 537	gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal);
 538	if (IS_ERR(gss_new))
 539		return gss_new;
 540	gss_msg = gss_add_msg(gss_new);
 541	if (gss_msg == gss_new) {
 542		int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg);
 
 
 543		if (res) {
 544			gss_unhash_msg(gss_new);
 
 
 545			gss_msg = ERR_PTR(res);
 546		}
 547	} else
 548		gss_release_msg(gss_new);
 549	return gss_msg;
 550}
 551
 552static void warn_gssd(void)
 553{
 554	dprintk("AUTH_GSS upcall failed. Please check user daemon is running.\n");
 555}
 556
 557static inline int
 558gss_refresh_upcall(struct rpc_task *task)
 559{
 560	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
 561	struct gss_auth *gss_auth = container_of(cred->cr_auth,
 562			struct gss_auth, rpc_auth);
 563	struct gss_cred *gss_cred = container_of(cred,
 564			struct gss_cred, gc_base);
 565	struct gss_upcall_msg *gss_msg;
 566	struct rpc_pipe *pipe;
 567	int err = 0;
 568
 569	dprintk("RPC: %5u %s for uid %u\n",
 570		task->tk_pid, __func__, from_kuid(&init_user_ns, cred->cr_uid));
 571	gss_msg = gss_setup_upcall(gss_auth, cred);
 572	if (PTR_ERR(gss_msg) == -EAGAIN) {
 573		/* XXX: warning on the first, under the assumption we
 574		 * shouldn't normally hit this case on a refresh. */
 575		warn_gssd();
 576		task->tk_timeout = 15*HZ;
 577		rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL);
 578		return -EAGAIN;
 
 579	}
 580	if (IS_ERR(gss_msg)) {
 581		err = PTR_ERR(gss_msg);
 582		goto out;
 583	}
 584	pipe = gss_msg->pipe;
 585	spin_lock(&pipe->lock);
 586	if (gss_cred->gc_upcall != NULL)
 587		rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
 588	else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
 589		task->tk_timeout = 0;
 590		gss_cred->gc_upcall = gss_msg;
 591		/* gss_upcall_callback will release the reference to gss_upcall_msg */
 592		atomic_inc(&gss_msg->count);
 593		rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback);
 594	} else {
 595		gss_handle_downcall_result(gss_cred, gss_msg);
 596		err = gss_msg->msg.errno;
 597	}
 598	spin_unlock(&pipe->lock);
 599	gss_release_msg(gss_msg);
 600out:
 601	dprintk("RPC: %5u %s for uid %u result %d\n",
 602		task->tk_pid, __func__,
 603		from_kuid(&init_user_ns, cred->cr_uid),	err);
 604	return err;
 605}
 606
 607static inline int
 608gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
 609{
 610	struct net *net = gss_auth->net;
 611	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 612	struct rpc_pipe *pipe;
 613	struct rpc_cred *cred = &gss_cred->gc_base;
 614	struct gss_upcall_msg *gss_msg;
 615	DEFINE_WAIT(wait);
 616	int err;
 617
 618	dprintk("RPC:       %s for uid %u\n",
 619		__func__, from_kuid(&init_user_ns, cred->cr_uid));
 620retry:
 621	err = 0;
 622	/* if gssd is down, just skip upcalling altogether */
 623	if (!gssd_running(net)) {
 624		warn_gssd();
 625		return -EACCES;
 
 626	}
 627	gss_msg = gss_setup_upcall(gss_auth, cred);
 628	if (PTR_ERR(gss_msg) == -EAGAIN) {
 629		err = wait_event_interruptible_timeout(pipe_version_waitqueue,
 630				sn->pipe_version >= 0, 15 * HZ);
 631		if (sn->pipe_version < 0) {
 632			warn_gssd();
 633			err = -EACCES;
 634		}
 635		if (err < 0)
 636			goto out;
 637		goto retry;
 638	}
 639	if (IS_ERR(gss_msg)) {
 640		err = PTR_ERR(gss_msg);
 641		goto out;
 642	}
 643	pipe = gss_msg->pipe;
 644	for (;;) {
 645		prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE);
 646		spin_lock(&pipe->lock);
 647		if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
 648			break;
 649		}
 650		spin_unlock(&pipe->lock);
 651		if (fatal_signal_pending(current)) {
 652			err = -ERESTARTSYS;
 653			goto out_intr;
 654		}
 655		schedule();
 656	}
 657	if (gss_msg->ctx)
 658		gss_cred_set_ctx(cred, gss_msg->ctx);
 659	else
 660		err = gss_msg->msg.errno;
 661	spin_unlock(&pipe->lock);
 662out_intr:
 663	finish_wait(&gss_msg->waitqueue, &wait);
 664	gss_release_msg(gss_msg);
 665out:
 666	dprintk("RPC:       %s for uid %u result %d\n",
 667		__func__, from_kuid(&init_user_ns, cred->cr_uid), err);
 668	return err;
 669}
 670
 671#define MSG_BUF_MAXSIZE 1024
 672
 673static ssize_t
 674gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
 675{
 676	const void *p, *end;
 677	void *buf;
 678	struct gss_upcall_msg *gss_msg;
 679	struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe;
 680	struct gss_cl_ctx *ctx;
 681	uid_t id;
 682	kuid_t uid;
 683	ssize_t err = -EFBIG;
 684
 685	if (mlen > MSG_BUF_MAXSIZE)
 686		goto out;
 687	err = -ENOMEM;
 688	buf = kmalloc(mlen, GFP_NOFS);
 689	if (!buf)
 690		goto out;
 691
 692	err = -EFAULT;
 693	if (copy_from_user(buf, src, mlen))
 694		goto err;
 695
 696	end = (const void *)((char *)buf + mlen);
 697	p = simple_get_bytes(buf, end, &id, sizeof(id));
 698	if (IS_ERR(p)) {
 699		err = PTR_ERR(p);
 700		goto err;
 701	}
 702
 703	uid = make_kuid(&init_user_ns, id);
 704	if (!uid_valid(uid)) {
 705		err = -EINVAL;
 706		goto err;
 707	}
 708
 709	err = -ENOMEM;
 710	ctx = gss_alloc_context();
 711	if (ctx == NULL)
 712		goto err;
 713
 714	err = -ENOENT;
 715	/* Find a matching upcall */
 716	spin_lock(&pipe->lock);
 717	gss_msg = __gss_find_upcall(pipe, uid);
 718	if (gss_msg == NULL) {
 719		spin_unlock(&pipe->lock);
 720		goto err_put_ctx;
 721	}
 722	list_del_init(&gss_msg->list);
 723	spin_unlock(&pipe->lock);
 724
 725	p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
 726	if (IS_ERR(p)) {
 727		err = PTR_ERR(p);
 728		switch (err) {
 729		case -EACCES:
 730		case -EKEYEXPIRED:
 731			gss_msg->msg.errno = err;
 732			err = mlen;
 733			break;
 734		case -EFAULT:
 735		case -ENOMEM:
 736		case -EINVAL:
 737		case -ENOSYS:
 738			gss_msg->msg.errno = -EAGAIN;
 739			break;
 740		default:
 741			printk(KERN_CRIT "%s: bad return from "
 742				"gss_fill_context: %zd\n", __func__, err);
 743			gss_msg->msg.errno = -EIO;
 744		}
 745		goto err_release_msg;
 746	}
 747	gss_msg->ctx = gss_get_ctx(ctx);
 748	err = mlen;
 749
 750err_release_msg:
 751	spin_lock(&pipe->lock);
 752	__gss_unhash_msg(gss_msg);
 753	spin_unlock(&pipe->lock);
 754	gss_release_msg(gss_msg);
 755err_put_ctx:
 756	gss_put_ctx(ctx);
 757err:
 758	kfree(buf);
 759out:
 760	dprintk("RPC:       %s returning %Zd\n", __func__, err);
 761	return err;
 762}
 763
 764static int gss_pipe_open(struct inode *inode, int new_version)
 765{
 766	struct net *net = inode->i_sb->s_fs_info;
 767	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 768	int ret = 0;
 769
 770	spin_lock(&pipe_version_lock);
 771	if (sn->pipe_version < 0) {
 772		/* First open of any gss pipe determines the version: */
 773		sn->pipe_version = new_version;
 774		rpc_wake_up(&pipe_version_rpc_waitqueue);
 775		wake_up(&pipe_version_waitqueue);
 776	} else if (sn->pipe_version != new_version) {
 777		/* Trying to open a pipe of a different version */
 778		ret = -EBUSY;
 779		goto out;
 780	}
 781	atomic_inc(&sn->pipe_users);
 782out:
 783	spin_unlock(&pipe_version_lock);
 784	return ret;
 785
 786}
 787
 788static int gss_pipe_open_v0(struct inode *inode)
 789{
 790	return gss_pipe_open(inode, 0);
 791}
 792
 793static int gss_pipe_open_v1(struct inode *inode)
 794{
 795	return gss_pipe_open(inode, 1);
 796}
 797
 798static void
 799gss_pipe_release(struct inode *inode)
 800{
 801	struct net *net = inode->i_sb->s_fs_info;
 802	struct rpc_pipe *pipe = RPC_I(inode)->pipe;
 803	struct gss_upcall_msg *gss_msg;
 804
 805restart:
 806	spin_lock(&pipe->lock);
 807	list_for_each_entry(gss_msg, &pipe->in_downcall, list) {
 808
 809		if (!list_empty(&gss_msg->msg.list))
 810			continue;
 811		gss_msg->msg.errno = -EPIPE;
 812		atomic_inc(&gss_msg->count);
 813		__gss_unhash_msg(gss_msg);
 814		spin_unlock(&pipe->lock);
 815		gss_release_msg(gss_msg);
 816		goto restart;
 817	}
 818	spin_unlock(&pipe->lock);
 819
 820	put_pipe_version(net);
 821}
 822
 823static void
 824gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
 825{
 826	struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
 827
 828	if (msg->errno < 0) {
 829		dprintk("RPC:       %s releasing msg %p\n",
 830			__func__, gss_msg);
 831		atomic_inc(&gss_msg->count);
 832		gss_unhash_msg(gss_msg);
 833		if (msg->errno == -ETIMEDOUT)
 834			warn_gssd();
 835		gss_release_msg(gss_msg);
 836	}
 
 837}
 838
 839static void gss_pipe_dentry_destroy(struct dentry *dir,
 840		struct rpc_pipe_dir_object *pdo)
 841{
 842	struct gss_pipe *gss_pipe = pdo->pdo_data;
 843	struct rpc_pipe *pipe = gss_pipe->pipe;
 844
 845	if (pipe->dentry != NULL) {
 846		rpc_unlink(pipe->dentry);
 847		pipe->dentry = NULL;
 848	}
 849}
 850
 851static int gss_pipe_dentry_create(struct dentry *dir,
 852		struct rpc_pipe_dir_object *pdo)
 853{
 854	struct gss_pipe *p = pdo->pdo_data;
 855	struct dentry *dentry;
 856
 857	dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe);
 858	if (IS_ERR(dentry))
 859		return PTR_ERR(dentry);
 860	p->pipe->dentry = dentry;
 861	return 0;
 862}
 863
 864static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = {
 865	.create = gss_pipe_dentry_create,
 866	.destroy = gss_pipe_dentry_destroy,
 867};
 868
 869static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt,
 870		const char *name,
 871		const struct rpc_pipe_ops *upcall_ops)
 872{
 873	struct gss_pipe *p;
 874	int err = -ENOMEM;
 875
 876	p = kmalloc(sizeof(*p), GFP_KERNEL);
 877	if (p == NULL)
 878		goto err;
 879	p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
 880	if (IS_ERR(p->pipe)) {
 881		err = PTR_ERR(p->pipe);
 882		goto err_free_gss_pipe;
 883	}
 884	p->name = name;
 885	p->clnt = clnt;
 886	kref_init(&p->kref);
 887	rpc_init_pipe_dir_object(&p->pdo,
 888			&gss_pipe_dir_object_ops,
 889			p);
 890	return p;
 891err_free_gss_pipe:
 892	kfree(p);
 893err:
 894	return ERR_PTR(err);
 895}
 896
 897struct gss_alloc_pdo {
 898	struct rpc_clnt *clnt;
 899	const char *name;
 900	const struct rpc_pipe_ops *upcall_ops;
 901};
 902
 903static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data)
 904{
 905	struct gss_pipe *gss_pipe;
 906	struct gss_alloc_pdo *args = data;
 907
 908	if (pdo->pdo_ops != &gss_pipe_dir_object_ops)
 909		return 0;
 910	gss_pipe = container_of(pdo, struct gss_pipe, pdo);
 911	if (strcmp(gss_pipe->name, args->name) != 0)
 912		return 0;
 913	if (!kref_get_unless_zero(&gss_pipe->kref))
 914		return 0;
 915	return 1;
 916}
 917
 918static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data)
 919{
 920	struct gss_pipe *gss_pipe;
 921	struct gss_alloc_pdo *args = data;
 922
 923	gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops);
 924	if (!IS_ERR(gss_pipe))
 925		return &gss_pipe->pdo;
 926	return NULL;
 927}
 928
 929static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt,
 930		const char *name,
 931		const struct rpc_pipe_ops *upcall_ops)
 932{
 933	struct net *net = rpc_net_ns(clnt);
 934	struct rpc_pipe_dir_object *pdo;
 935	struct gss_alloc_pdo args = {
 936		.clnt = clnt,
 937		.name = name,
 938		.upcall_ops = upcall_ops,
 939	};
 940
 941	pdo = rpc_find_or_alloc_pipe_dir_object(net,
 942			&clnt->cl_pipedir_objects,
 943			gss_pipe_match_pdo,
 944			gss_pipe_alloc_pdo,
 945			&args);
 946	if (pdo != NULL)
 947		return container_of(pdo, struct gss_pipe, pdo);
 948	return ERR_PTR(-ENOMEM);
 949}
 950
 951static void __gss_pipe_free(struct gss_pipe *p)
 952{
 953	struct rpc_clnt *clnt = p->clnt;
 954	struct net *net = rpc_net_ns(clnt);
 955
 956	rpc_remove_pipe_dir_object(net,
 957			&clnt->cl_pipedir_objects,
 958			&p->pdo);
 959	rpc_destroy_pipe_data(p->pipe);
 960	kfree(p);
 961}
 962
 963static void __gss_pipe_release(struct kref *kref)
 964{
 965	struct gss_pipe *p = container_of(kref, struct gss_pipe, kref);
 966
 967	__gss_pipe_free(p);
 968}
 969
 970static void gss_pipe_free(struct gss_pipe *p)
 971{
 972	if (p != NULL)
 973		kref_put(&p->kref, __gss_pipe_release);
 974}
 975
 976/*
 977 * NOTE: we have the opportunity to use different
 978 * parameters based on the input flavor (which must be a pseudoflavor)
 979 */
 980static struct gss_auth *
 981gss_create_new(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
 982{
 983	rpc_authflavor_t flavor = args->pseudoflavor;
 984	struct gss_auth *gss_auth;
 985	struct gss_pipe *gss_pipe;
 986	struct rpc_auth * auth;
 987	int err = -ENOMEM; /* XXX? */
 988
 989	dprintk("RPC:       creating GSS authenticator for client %p\n", clnt);
 990
 991	if (!try_module_get(THIS_MODULE))
 992		return ERR_PTR(err);
 993	if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
 994		goto out_dec;
 995	INIT_HLIST_NODE(&gss_auth->hash);
 996	gss_auth->target_name = NULL;
 997	if (args->target_name) {
 998		gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL);
 999		if (gss_auth->target_name == NULL)
1000			goto err_free;
1001	}
1002	gss_auth->client = clnt;
1003	gss_auth->net = get_net(rpc_net_ns(clnt));
1004	err = -EINVAL;
1005	gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
1006	if (!gss_auth->mech) {
1007		dprintk("RPC:       Pseudoflavor %d not found!\n", flavor);
1008		goto err_put_net;
1009	}
1010	gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
1011	if (gss_auth->service == 0)
1012		goto err_put_mech;
1013	if (!gssd_running(gss_auth->net))
1014		goto err_put_mech;
1015	auth = &gss_auth->rpc_auth;
1016	auth->au_cslack = GSS_CRED_SLACK >> 2;
1017	auth->au_rslack = GSS_VERF_SLACK >> 2;
 
 
 
1018	auth->au_ops = &authgss_ops;
1019	auth->au_flavor = flavor;
1020	atomic_set(&auth->au_count, 1);
 
 
1021	kref_init(&gss_auth->kref);
1022
1023	err = rpcauth_init_credcache(auth);
1024	if (err)
1025		goto err_put_mech;
1026	/*
1027	 * Note: if we created the old pipe first, then someone who
1028	 * examined the directory at the right moment might conclude
1029	 * that we supported only the old pipe.  So we instead create
1030	 * the new pipe first.
1031	 */
1032	gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1);
1033	if (IS_ERR(gss_pipe)) {
1034		err = PTR_ERR(gss_pipe);
1035		goto err_destroy_credcache;
1036	}
1037	gss_auth->gss_pipe[1] = gss_pipe;
1038
1039	gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name,
1040			&gss_upcall_ops_v0);
1041	if (IS_ERR(gss_pipe)) {
1042		err = PTR_ERR(gss_pipe);
1043		goto err_destroy_pipe_1;
1044	}
1045	gss_auth->gss_pipe[0] = gss_pipe;
1046
1047	return gss_auth;
1048err_destroy_pipe_1:
1049	gss_pipe_free(gss_auth->gss_pipe[1]);
1050err_destroy_credcache:
1051	rpcauth_destroy_credcache(auth);
1052err_put_mech:
1053	gss_mech_put(gss_auth->mech);
1054err_put_net:
1055	put_net(gss_auth->net);
1056err_free:
1057	kfree(gss_auth->target_name);
1058	kfree(gss_auth);
1059out_dec:
1060	module_put(THIS_MODULE);
 
1061	return ERR_PTR(err);
1062}
1063
1064static void
1065gss_free(struct gss_auth *gss_auth)
1066{
1067	gss_pipe_free(gss_auth->gss_pipe[0]);
1068	gss_pipe_free(gss_auth->gss_pipe[1]);
1069	gss_mech_put(gss_auth->mech);
1070	put_net(gss_auth->net);
1071	kfree(gss_auth->target_name);
1072
1073	kfree(gss_auth);
1074	module_put(THIS_MODULE);
1075}
1076
1077static void
1078gss_free_callback(struct kref *kref)
1079{
1080	struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref);
1081
1082	gss_free(gss_auth);
1083}
1084
1085static void
1086gss_put_auth(struct gss_auth *gss_auth)
1087{
1088	kref_put(&gss_auth->kref, gss_free_callback);
1089}
1090
1091static void
1092gss_destroy(struct rpc_auth *auth)
1093{
1094	struct gss_auth *gss_auth = container_of(auth,
1095			struct gss_auth, rpc_auth);
1096
1097	dprintk("RPC:       destroying GSS authenticator %p flavor %d\n",
1098			auth, auth->au_flavor);
1099
1100	if (hash_hashed(&gss_auth->hash)) {
1101		spin_lock(&gss_auth_hash_lock);
1102		hash_del(&gss_auth->hash);
1103		spin_unlock(&gss_auth_hash_lock);
1104	}
1105
1106	gss_pipe_free(gss_auth->gss_pipe[0]);
1107	gss_auth->gss_pipe[0] = NULL;
1108	gss_pipe_free(gss_auth->gss_pipe[1]);
1109	gss_auth->gss_pipe[1] = NULL;
1110	rpcauth_destroy_credcache(auth);
1111
1112	gss_put_auth(gss_auth);
1113}
1114
1115/*
1116 * Auths may be shared between rpc clients that were cloned from a
1117 * common client with the same xprt, if they also share the flavor and
1118 * target_name.
1119 *
1120 * The auth is looked up from the oldest parent sharing the same
1121 * cl_xprt, and the auth itself references only that common parent
1122 * (which is guaranteed to last as long as any of its descendants).
1123 */
1124static struct gss_auth *
1125gss_auth_find_or_add_hashed(struct rpc_auth_create_args *args,
1126		struct rpc_clnt *clnt,
1127		struct gss_auth *new)
1128{
1129	struct gss_auth *gss_auth;
1130	unsigned long hashval = (unsigned long)clnt;
1131
1132	spin_lock(&gss_auth_hash_lock);
1133	hash_for_each_possible(gss_auth_hash_table,
1134			gss_auth,
1135			hash,
1136			hashval) {
1137		if (gss_auth->client != clnt)
1138			continue;
1139		if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor)
1140			continue;
1141		if (gss_auth->target_name != args->target_name) {
1142			if (gss_auth->target_name == NULL)
1143				continue;
1144			if (args->target_name == NULL)
1145				continue;
1146			if (strcmp(gss_auth->target_name, args->target_name))
1147				continue;
1148		}
1149		if (!atomic_inc_not_zero(&gss_auth->rpc_auth.au_count))
1150			continue;
1151		goto out;
1152	}
1153	if (new)
1154		hash_add(gss_auth_hash_table, &new->hash, hashval);
1155	gss_auth = new;
1156out:
1157	spin_unlock(&gss_auth_hash_lock);
1158	return gss_auth;
1159}
1160
1161static struct gss_auth *
1162gss_create_hashed(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
 
1163{
1164	struct gss_auth *gss_auth;
1165	struct gss_auth *new;
1166
1167	gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL);
1168	if (gss_auth != NULL)
1169		goto out;
1170	new = gss_create_new(args, clnt);
1171	if (IS_ERR(new))
1172		return new;
1173	gss_auth = gss_auth_find_or_add_hashed(args, clnt, new);
1174	if (gss_auth != new)
1175		gss_destroy(&new->rpc_auth);
1176out:
1177	return gss_auth;
1178}
1179
1180static struct rpc_auth *
1181gss_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
1182{
1183	struct gss_auth *gss_auth;
1184	struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch);
1185
1186	while (clnt != clnt->cl_parent) {
1187		struct rpc_clnt *parent = clnt->cl_parent;
1188		/* Find the original parent for this transport */
1189		if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps)
1190			break;
1191		clnt = parent;
1192	}
1193
1194	gss_auth = gss_create_hashed(args, clnt);
1195	if (IS_ERR(gss_auth))
1196		return ERR_CAST(gss_auth);
1197	return &gss_auth->rpc_auth;
1198}
1199
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1200/*
1201 * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call
1202 * to the server with the GSS control procedure field set to
1203 * RPC_GSS_PROC_DESTROY. This should normally cause the server to release
1204 * all RPCSEC_GSS state associated with that context.
1205 */
1206static int
1207gss_destroying_context(struct rpc_cred *cred)
1208{
1209	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1210	struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
1211	struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1);
 
1212	struct rpc_task *task;
1213
1214	if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
1215		return 0;
1216
1217	ctx->gc_proc = RPC_GSS_PROC_DESTROY;
1218	cred->cr_ops = &gss_nullops;
 
 
 
1219
1220	/* Take a reference to ensure the cred will be destroyed either
1221	 * by the RPC call or by the put_rpccred() below */
1222	get_rpccred(cred);
1223
1224	task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT);
1225	if (!IS_ERR(task))
1226		rpc_put_task(task);
1227
1228	put_rpccred(cred);
1229	return 1;
1230}
1231
1232/* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure
1233 * to create a new cred or context, so they check that things have been
1234 * allocated before freeing them. */
1235static void
1236gss_do_free_ctx(struct gss_cl_ctx *ctx)
1237{
1238	dprintk("RPC:       %s\n", __func__);
1239
1240	gss_delete_sec_context(&ctx->gc_gss_ctx);
1241	kfree(ctx->gc_wire_ctx.data);
1242	kfree(ctx->gc_acceptor.data);
1243	kfree(ctx);
1244}
1245
1246static void
1247gss_free_ctx_callback(struct rcu_head *head)
1248{
1249	struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu);
1250	gss_do_free_ctx(ctx);
1251}
1252
1253static void
1254gss_free_ctx(struct gss_cl_ctx *ctx)
1255{
1256	call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
1257}
1258
1259static void
1260gss_free_cred(struct gss_cred *gss_cred)
1261{
1262	dprintk("RPC:       %s cred=%p\n", __func__, gss_cred);
1263	kfree(gss_cred);
1264}
1265
1266static void
1267gss_free_cred_callback(struct rcu_head *head)
1268{
1269	struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu);
1270	gss_free_cred(gss_cred);
1271}
1272
1273static void
1274gss_destroy_nullcred(struct rpc_cred *cred)
1275{
1276	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1277	struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
1278	struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1);
1279
1280	RCU_INIT_POINTER(gss_cred->gc_ctx, NULL);
 
1281	call_rcu(&cred->cr_rcu, gss_free_cred_callback);
1282	if (ctx)
1283		gss_put_ctx(ctx);
1284	gss_put_auth(gss_auth);
1285}
1286
1287static void
1288gss_destroy_cred(struct rpc_cred *cred)
1289{
1290
1291	if (gss_destroying_context(cred))
1292		return;
1293	gss_destroy_nullcred(cred);
1294}
1295
 
 
 
 
 
 
1296/*
1297 * Lookup RPCSEC_GSS cred for the current process
1298 */
1299static struct rpc_cred *
1300gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
1301{
1302	return rpcauth_lookup_credcache(auth, acred, flags);
1303}
1304
1305static struct rpc_cred *
1306gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
1307{
1308	struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
1309	struct gss_cred	*cred = NULL;
1310	int err = -ENOMEM;
1311
1312	dprintk("RPC:       %s for uid %d, flavor %d\n",
1313		__func__, from_kuid(&init_user_ns, acred->uid),
1314		auth->au_flavor);
1315
1316	if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS)))
1317		goto out_err;
1318
1319	rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops);
1320	/*
1321	 * Note: in order to force a call to call_refresh(), we deliberately
1322	 * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
1323	 */
1324	cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
1325	cred->gc_service = gss_auth->service;
1326	cred->gc_principal = NULL;
1327	if (acred->machine_cred)
1328		cred->gc_principal = acred->principal;
1329	kref_get(&gss_auth->kref);
1330	return &cred->gc_base;
1331
1332out_err:
1333	dprintk("RPC:       %s failed with error %d\n", __func__, err);
1334	return ERR_PTR(err);
1335}
1336
1337static int
1338gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred)
1339{
1340	struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
1341	struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base);
1342	int err;
1343
1344	do {
1345		err = gss_create_upcall(gss_auth, gss_cred);
1346	} while (err == -EAGAIN);
1347	return err;
1348}
1349
1350static char *
1351gss_stringify_acceptor(struct rpc_cred *cred)
1352{
1353	char *string = NULL;
1354	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1355	struct gss_cl_ctx *ctx;
1356	unsigned int len;
1357	struct xdr_netobj *acceptor;
1358
1359	rcu_read_lock();
1360	ctx = rcu_dereference(gss_cred->gc_ctx);
1361	if (!ctx)
1362		goto out;
1363
1364	len = ctx->gc_acceptor.len;
1365	rcu_read_unlock();
1366
1367	/* no point if there's no string */
1368	if (!len)
1369		return NULL;
1370realloc:
1371	string = kmalloc(len + 1, GFP_KERNEL);
1372	if (!string)
1373		return NULL;
1374
1375	rcu_read_lock();
1376	ctx = rcu_dereference(gss_cred->gc_ctx);
1377
1378	/* did the ctx disappear or was it replaced by one with no acceptor? */
1379	if (!ctx || !ctx->gc_acceptor.len) {
1380		kfree(string);
1381		string = NULL;
1382		goto out;
1383	}
1384
1385	acceptor = &ctx->gc_acceptor;
1386
1387	/*
1388	 * Did we find a new acceptor that's longer than the original? Allocate
1389	 * a longer buffer and try again.
1390	 */
1391	if (len < acceptor->len) {
1392		len = acceptor->len;
1393		rcu_read_unlock();
1394		kfree(string);
1395		goto realloc;
1396	}
1397
1398	memcpy(string, acceptor->data, acceptor->len);
1399	string[acceptor->len] = '\0';
1400out:
1401	rcu_read_unlock();
1402	return string;
1403}
1404
1405/*
1406 * Returns -EACCES if GSS context is NULL or will expire within the
1407 * timeout (miliseconds)
1408 */
1409static int
1410gss_key_timeout(struct rpc_cred *rc)
1411{
1412	struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
1413	struct gss_cl_ctx *ctx;
1414	unsigned long timeout = jiffies + (gss_key_expire_timeo * HZ);
1415	int ret = 0;
1416
1417	rcu_read_lock();
1418	ctx = rcu_dereference(gss_cred->gc_ctx);
1419	if (!ctx || time_after(timeout, ctx->gc_expiry))
1420		ret = -EACCES;
1421	rcu_read_unlock();
1422
1423	return ret;
1424}
1425
1426static int
1427gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
1428{
1429	struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
1430	struct gss_cl_ctx *ctx;
1431	int ret;
1432
1433	if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
1434		goto out;
1435	/* Don't match with creds that have expired. */
1436	rcu_read_lock();
1437	ctx = rcu_dereference(gss_cred->gc_ctx);
1438	if (!ctx || time_after(jiffies, ctx->gc_expiry)) {
1439		rcu_read_unlock();
1440		return 0;
1441	}
1442	rcu_read_unlock();
1443	if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
1444		return 0;
1445out:
1446	if (acred->principal != NULL) {
1447		if (gss_cred->gc_principal == NULL)
1448			return 0;
1449		ret = strcmp(acred->principal, gss_cred->gc_principal) == 0;
1450		goto check_expire;
1451	}
1452	if (gss_cred->gc_principal != NULL)
1453		return 0;
1454	ret = uid_eq(rc->cr_uid, acred->uid);
1455
1456check_expire:
1457	if (ret == 0)
1458		return ret;
1459
1460	/* Notify acred users of GSS context expiration timeout */
1461	if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags) &&
1462	    (gss_key_timeout(rc) != 0)) {
1463		/* test will now be done from generic cred */
1464		test_and_clear_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags);
1465		/* tell NFS layer that key will expire soon */
1466		set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags);
1467	}
1468	return ret;
1469}
1470
1471/*
1472* Marshal credentials.
1473* Maybe we should keep a cached credential for performance reasons.
1474*/
1475static __be32 *
1476gss_marshal(struct rpc_task *task, __be32 *p)
 
 
1477{
1478	struct rpc_rqst *req = task->tk_rqstp;
1479	struct rpc_cred *cred = req->rq_cred;
1480	struct gss_cred	*gss_cred = container_of(cred, struct gss_cred,
1481						 gc_base);
1482	struct gss_cl_ctx	*ctx = gss_cred_get_ctx(cred);
1483	__be32		*cred_len;
1484	u32             maj_stat = 0;
1485	struct xdr_netobj mic;
1486	struct kvec	iov;
1487	struct xdr_buf	verf_buf;
 
1488
1489	dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1490
1491	*p++ = htonl(RPC_AUTH_GSS);
 
 
 
 
1492	cred_len = p++;
1493
1494	spin_lock(&ctx->gc_seq_lock);
1495	req->rq_seqno = ctx->gc_seq++;
1496	spin_unlock(&ctx->gc_seq_lock);
1497
1498	*p++ = htonl((u32) RPC_GSS_VERSION);
1499	*p++ = htonl((u32) ctx->gc_proc);
1500	*p++ = htonl((u32) req->rq_seqno);
1501	*p++ = htonl((u32) gss_cred->gc_service);
 
 
 
1502	p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
1503	*cred_len = htonl((p - (cred_len + 1)) << 2);
 
 
1504
1505	/* We compute the checksum for the verifier over the xdr-encoded bytes
1506	 * starting with the xid and ending at the end of the credential: */
1507	iov.iov_base = xprt_skip_transport_header(req->rq_xprt,
1508					req->rq_snd_buf.head[0].iov_base);
1509	iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
1510	xdr_buf_from_iov(&iov, &verf_buf);
1511
1512	/* set verifier flavor*/
1513	*p++ = htonl(RPC_AUTH_GSS);
1514
 
1515	mic.data = (u8 *)(p + 1);
1516	maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1517	if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
1518		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1519	} else if (maj_stat != 0) {
1520		printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
1521		goto out_put_ctx;
1522	}
1523	p = xdr_encode_opaque(p, NULL, mic.len);
1524	gss_put_ctx(ctx);
1525	return p;
1526out_put_ctx:
1527	gss_put_ctx(ctx);
1528	return NULL;
 
 
 
 
 
 
 
 
 
 
 
1529}
1530
1531static int gss_renew_cred(struct rpc_task *task)
1532{
1533	struct rpc_cred *oldcred = task->tk_rqstp->rq_cred;
1534	struct gss_cred *gss_cred = container_of(oldcred,
1535						 struct gss_cred,
1536						 gc_base);
1537	struct rpc_auth *auth = oldcred->cr_auth;
1538	struct auth_cred acred = {
1539		.uid = oldcred->cr_uid,
1540		.principal = gss_cred->gc_principal,
1541		.machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0),
1542	};
1543	struct rpc_cred *new;
1544
1545	new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
1546	if (IS_ERR(new))
1547		return PTR_ERR(new);
1548	task->tk_rqstp->rq_cred = new;
1549	put_rpccred(oldcred);
1550	return 0;
1551}
1552
1553static int gss_cred_is_negative_entry(struct rpc_cred *cred)
1554{
1555	if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) {
1556		unsigned long now = jiffies;
1557		unsigned long begin, expire;
1558		struct gss_cred *gss_cred; 
1559
1560		gss_cred = container_of(cred, struct gss_cred, gc_base);
1561		begin = gss_cred->gc_upcall_timestamp;
1562		expire = begin + gss_expired_cred_retry_delay * HZ;
1563
1564		if (time_in_range_open(now, begin, expire))
1565			return 1;
1566	}
1567	return 0;
1568}
1569
1570/*
1571* Refresh credentials. XXX - finish
1572*/
1573static int
1574gss_refresh(struct rpc_task *task)
1575{
1576	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1577	int ret = 0;
1578
1579	if (gss_cred_is_negative_entry(cred))
1580		return -EKEYEXPIRED;
1581
1582	if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
1583			!test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) {
1584		ret = gss_renew_cred(task);
1585		if (ret < 0)
1586			goto out;
1587		cred = task->tk_rqstp->rq_cred;
1588	}
1589
1590	if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
1591		ret = gss_refresh_upcall(task);
1592out:
1593	return ret;
1594}
1595
1596/* Dummy refresh routine: used only when destroying the context */
1597static int
1598gss_refresh_null(struct rpc_task *task)
1599{
1600	return 0;
1601}
1602
1603static __be32 *
1604gss_validate(struct rpc_task *task, __be32 *p)
1605{
1606	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1607	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1608	__be32		seq;
1609	struct kvec	iov;
1610	struct xdr_buf	verf_buf;
1611	struct xdr_netobj mic;
1612	u32		flav,len;
1613	u32		maj_stat;
1614	__be32		*ret = ERR_PTR(-EIO);
1615
1616	dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1617
1618	flav = ntohl(*p++);
1619	if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
1620		goto out_bad;
1621	if (flav != RPC_AUTH_GSS)
1622		goto out_bad;
1623	seq = htonl(task->tk_rqstp->rq_seqno);
1624	iov.iov_base = &seq;
1625	iov.iov_len = sizeof(seq);
 
 
 
 
 
 
 
1626	xdr_buf_from_iov(&iov, &verf_buf);
1627	mic.data = (u8 *)p;
1628	mic.len = len;
1629
1630	ret = ERR_PTR(-EACCES);
1631	maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1632	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1633		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1634	if (maj_stat) {
1635		dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n",
1636			task->tk_pid, __func__, maj_stat);
1637		goto out_bad;
1638	}
1639	/* We leave it to unwrap to calculate au_rslack. For now we just
1640	 * calculate the length of the verifier: */
1641	cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
 
 
1642	gss_put_ctx(ctx);
1643	dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n",
1644			task->tk_pid, __func__);
1645	return p + XDR_QUADLEN(len);
1646out_bad:
1647	gss_put_ctx(ctx);
1648	dprintk("RPC: %5u %s failed ret %ld.\n", task->tk_pid, __func__,
1649		PTR_ERR(ret));
1650	return ret;
1651}
1652
1653static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp,
1654				__be32 *p, void *obj)
1655{
1656	struct xdr_stream xdr;
1657
1658	xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p);
1659	encode(rqstp, &xdr, obj);
 
 
 
 
 
1660}
1661
1662static inline int
1663gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1664		   kxdreproc_t encode, struct rpc_rqst *rqstp,
1665		   __be32 *p, void *obj)
1666{
1667	struct xdr_buf	*snd_buf = &rqstp->rq_snd_buf;
1668	struct xdr_buf	integ_buf;
1669	__be32          *integ_len = NULL;
1670	struct xdr_netobj mic;
1671	u32		offset;
1672	__be32		*q;
1673	struct kvec	*iov;
1674	u32             maj_stat = 0;
1675	int		status = -EIO;
1676
 
 
 
1677	integ_len = p++;
1678	offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1679	*p++ = htonl(rqstp->rq_seqno);
1680
1681	gss_wrap_req_encode(encode, rqstp, p, obj);
 
1682
 
1683	if (xdr_buf_subsegment(snd_buf, &integ_buf,
1684				offset, snd_buf->len - offset))
1685		return status;
1686	*integ_len = htonl(integ_buf.len);
1687
1688	/* guess whether we're in the head or the tail: */
1689	if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1690		iov = snd_buf->tail;
1691	else
1692		iov = snd_buf->head;
1693	p = iov->iov_base + iov->iov_len;
1694	mic.data = (u8 *)(p + 1);
1695
1696	maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1697	status = -EIO; /* XXX? */
1698	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1699		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1700	else if (maj_stat)
1701		return status;
1702	q = xdr_encode_opaque(p, NULL, mic.len);
1703
1704	offset = (u8 *)q - (u8 *)p;
1705	iov->iov_len += offset;
1706	snd_buf->len += offset;
1707	return 0;
 
 
 
 
 
1708}
1709
1710static void
1711priv_release_snd_buf(struct rpc_rqst *rqstp)
1712{
1713	int i;
1714
1715	for (i=0; i < rqstp->rq_enc_pages_num; i++)
1716		__free_page(rqstp->rq_enc_pages[i]);
1717	kfree(rqstp->rq_enc_pages);
 
1718}
1719
1720static int
1721alloc_enc_pages(struct rpc_rqst *rqstp)
1722{
1723	struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1724	int first, last, i;
1725
 
 
 
1726	if (snd_buf->page_len == 0) {
1727		rqstp->rq_enc_pages_num = 0;
1728		return 0;
1729	}
1730
1731	first = snd_buf->page_base >> PAGE_SHIFT;
1732	last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_SHIFT;
1733	rqstp->rq_enc_pages_num = last - first + 1 + 1;
1734	rqstp->rq_enc_pages
1735		= kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *),
 
1736				GFP_NOFS);
1737	if (!rqstp->rq_enc_pages)
1738		goto out;
1739	for (i=0; i < rqstp->rq_enc_pages_num; i++) {
1740		rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS);
1741		if (rqstp->rq_enc_pages[i] == NULL)
1742			goto out_free;
1743	}
1744	rqstp->rq_release_snd_buf = priv_release_snd_buf;
1745	return 0;
1746out_free:
1747	rqstp->rq_enc_pages_num = i;
1748	priv_release_snd_buf(rqstp);
1749out:
1750	return -EAGAIN;
1751}
1752
1753static inline int
1754gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1755		  kxdreproc_t encode, struct rpc_rqst *rqstp,
1756		  __be32 *p, void *obj)
1757{
 
1758	struct xdr_buf	*snd_buf = &rqstp->rq_snd_buf;
1759	u32		offset;
1760	u32             maj_stat;
1761	int		status;
1762	__be32		*opaque_len;
1763	struct page	**inpages;
1764	int		first;
1765	int		pad;
1766	struct kvec	*iov;
1767	char		*tmp;
1768
 
 
 
 
1769	opaque_len = p++;
1770	offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1771	*p++ = htonl(rqstp->rq_seqno);
1772
1773	gss_wrap_req_encode(encode, rqstp, p, obj);
 
1774
1775	status = alloc_enc_pages(rqstp);
1776	if (status)
1777		return status;
1778	first = snd_buf->page_base >> PAGE_SHIFT;
1779	inpages = snd_buf->pages + first;
1780	snd_buf->pages = rqstp->rq_enc_pages;
1781	snd_buf->page_base -= first << PAGE_SHIFT;
1782	/*
1783	 * Give the tail its own page, in case we need extra space in the
1784	 * head when wrapping:
1785	 *
1786	 * call_allocate() allocates twice the slack space required
1787	 * by the authentication flavor to rq_callsize.
1788	 * For GSS, slack is GSS_CRED_SLACK.
1789	 */
1790	if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
 
 
1791		tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]);
1792		memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len);
1793		snd_buf->tail[0].iov_base = tmp;
1794	}
 
1795	maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
1796	/* slack space should prevent this ever happening: */
1797	BUG_ON(snd_buf->len > snd_buf->buflen);
1798	status = -EIO;
1799	/* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was
1800	 * done anyway, so it's safe to put the request on the wire: */
1801	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1802		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1803	else if (maj_stat)
1804		return status;
1805
1806	*opaque_len = htonl(snd_buf->len - offset);
1807	/* guess whether we're in the head or the tail: */
1808	if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1809		iov = snd_buf->tail;
1810	else
1811		iov = snd_buf->head;
1812	p = iov->iov_base + iov->iov_len;
1813	pad = 3 - ((snd_buf->len - offset - 1) & 3);
1814	memset(p, 0, pad);
1815	iov->iov_len += pad;
1816	snd_buf->len += pad;
1817
1818	return 0;
 
 
 
 
 
1819}
1820
1821static int
1822gss_wrap_req(struct rpc_task *task,
1823	     kxdreproc_t encode, void *rqstp, __be32 *p, void *obj)
1824{
1825	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1826	struct gss_cred	*gss_cred = container_of(cred, struct gss_cred,
1827			gc_base);
1828	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1829	int             status = -EIO;
1830
1831	dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1832	if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
1833		/* The spec seems a little ambiguous here, but I think that not
1834		 * wrapping context destruction requests makes the most sense.
1835		 */
1836		gss_wrap_req_encode(encode, rqstp, p, obj);
1837		status = 0;
1838		goto out;
1839	}
1840	switch (gss_cred->gc_service) {
1841	case RPC_GSS_SVC_NONE:
1842		gss_wrap_req_encode(encode, rqstp, p, obj);
1843		status = 0;
1844		break;
1845	case RPC_GSS_SVC_INTEGRITY:
1846		status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj);
1847		break;
1848	case RPC_GSS_SVC_PRIVACY:
1849		status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj);
1850		break;
 
 
1851	}
1852out:
1853	gss_put_ctx(ctx);
1854	dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status);
1855	return status;
1856}
1857
1858static inline int
1859gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1860		struct rpc_rqst *rqstp, __be32 **p)
1861{
1862	struct xdr_buf	*rcv_buf = &rqstp->rq_rcv_buf;
1863	struct xdr_buf integ_buf;
 
 
 
 
 
 
 
 
 
 
 
 
 
1864	struct xdr_netobj mic;
1865	u32 data_offset, mic_offset;
1866	u32 integ_len;
1867	u32 maj_stat;
1868	int status = -EIO;
1869
1870	integ_len = ntohl(*(*p)++);
 
 
 
1871	if (integ_len & 3)
1872		return status;
1873	data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1874	mic_offset = integ_len + data_offset;
1875	if (mic_offset > rcv_buf->len)
1876		return status;
1877	if (ntohl(*(*p)++) != rqstp->rq_seqno)
1878		return status;
1879
1880	if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset,
1881				mic_offset - data_offset))
1882		return status;
1883
1884	if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset))
1885		return status;
1886
1887	maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1888	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1889		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1890	if (maj_stat != GSS_S_COMPLETE)
1891		return status;
 
 
 
1892	return 0;
 
 
 
 
 
 
 
 
 
1893}
1894
1895static inline int
1896gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1897		struct rpc_rqst *rqstp, __be32 **p)
1898{
1899	struct xdr_buf  *rcv_buf = &rqstp->rq_rcv_buf;
1900	u32 offset;
1901	u32 opaque_len;
1902	u32 maj_stat;
1903	int status = -EIO;
1904
1905	opaque_len = ntohl(*(*p)++);
1906	offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
 
 
 
 
 
1907	if (offset + opaque_len > rcv_buf->len)
1908		return status;
1909	/* remove padding: */
1910	rcv_buf->len = offset + opaque_len;
1911
1912	maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
1913	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1914		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1915	if (maj_stat != GSS_S_COMPLETE)
1916		return status;
1917	if (ntohl(*(*p)++) != rqstp->rq_seqno)
1918		return status;
 
 
 
 
 
 
1919
 
 
 
 
1920	return 0;
 
 
 
 
 
 
 
 
 
1921}
1922
1923static int
1924gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp,
1925		      __be32 *p, void *obj)
 
 
 
 
 
1926{
1927	struct xdr_stream xdr;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1928
1929	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
1930	return decode(rqstp, &xdr, obj);
 
 
 
1931}
1932
1933static int
1934gss_unwrap_resp(struct rpc_task *task,
1935		kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj)
1936{
1937	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
 
1938	struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1939			gc_base);
1940	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1941	__be32		*savedp = p;
1942	struct kvec	*head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head;
1943	int		savedlen = head->iov_len;
1944	int             status = -EIO;
1945
1946	if (ctx->gc_proc != RPC_GSS_PROC_DATA)
1947		goto out_decode;
1948	switch (gss_cred->gc_service) {
1949	case RPC_GSS_SVC_NONE:
 
1950		break;
1951	case RPC_GSS_SVC_INTEGRITY:
1952		status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p);
1953		if (status)
1954			goto out;
1955		break;
1956	case RPC_GSS_SVC_PRIVACY:
1957		status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p);
1958		if (status)
1959			goto out;
1960		break;
1961	}
1962	/* take into account extra slack for integrity and privacy cases: */
1963	cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp)
1964						+ (savedlen - head->iov_len);
1965out_decode:
1966	status = gss_unwrap_req_decode(decode, rqstp, p, obj);
1967out:
1968	gss_put_ctx(ctx);
1969	dprintk("RPC: %5u %s returning %d\n",
1970		task->tk_pid, __func__, status);
1971	return status;
1972}
1973
1974static const struct rpc_authops authgss_ops = {
1975	.owner		= THIS_MODULE,
1976	.au_flavor	= RPC_AUTH_GSS,
1977	.au_name	= "RPCSEC_GSS",
1978	.create		= gss_create,
1979	.destroy	= gss_destroy,
 
1980	.lookup_cred	= gss_lookup_cred,
1981	.crcreate	= gss_create_cred,
1982	.list_pseudoflavors = gss_mech_list_pseudoflavors,
1983	.info2flavor	= gss_mech_info2flavor,
1984	.flavor2info	= gss_mech_flavor2info,
1985};
1986
1987static const struct rpc_credops gss_credops = {
1988	.cr_name		= "AUTH_GSS",
1989	.crdestroy		= gss_destroy_cred,
1990	.cr_init		= gss_cred_init,
1991	.crbind			= rpcauth_generic_bind_cred,
1992	.crmatch		= gss_match,
1993	.crmarshal		= gss_marshal,
1994	.crrefresh		= gss_refresh,
1995	.crvalidate		= gss_validate,
1996	.crwrap_req		= gss_wrap_req,
1997	.crunwrap_resp		= gss_unwrap_resp,
1998	.crkey_timeout		= gss_key_timeout,
1999	.crstringify_acceptor	= gss_stringify_acceptor,
 
2000};
2001
2002static const struct rpc_credops gss_nullops = {
2003	.cr_name		= "AUTH_GSS",
2004	.crdestroy		= gss_destroy_nullcred,
2005	.crbind			= rpcauth_generic_bind_cred,
2006	.crmatch		= gss_match,
2007	.crmarshal		= gss_marshal,
2008	.crrefresh		= gss_refresh_null,
2009	.crvalidate		= gss_validate,
2010	.crwrap_req		= gss_wrap_req,
2011	.crunwrap_resp		= gss_unwrap_resp,
2012	.crstringify_acceptor	= gss_stringify_acceptor,
2013};
2014
2015static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
2016	.upcall		= rpc_pipe_generic_upcall,
2017	.downcall	= gss_pipe_downcall,
2018	.destroy_msg	= gss_pipe_destroy_msg,
2019	.open_pipe	= gss_pipe_open_v0,
2020	.release_pipe	= gss_pipe_release,
2021};
2022
2023static const struct rpc_pipe_ops gss_upcall_ops_v1 = {
2024	.upcall		= rpc_pipe_generic_upcall,
2025	.downcall	= gss_pipe_downcall,
2026	.destroy_msg	= gss_pipe_destroy_msg,
2027	.open_pipe	= gss_pipe_open_v1,
2028	.release_pipe	= gss_pipe_release,
2029};
2030
2031static __net_init int rpcsec_gss_init_net(struct net *net)
2032{
2033	return gss_svc_init_net(net);
2034}
2035
2036static __net_exit void rpcsec_gss_exit_net(struct net *net)
2037{
2038	gss_svc_shutdown_net(net);
2039}
2040
2041static struct pernet_operations rpcsec_gss_net_ops = {
2042	.init = rpcsec_gss_init_net,
2043	.exit = rpcsec_gss_exit_net,
2044};
2045
2046/*
2047 * Initialize RPCSEC_GSS module
2048 */
2049static int __init init_rpcsec_gss(void)
2050{
2051	int err = 0;
2052
2053	err = rpcauth_register(&authgss_ops);
2054	if (err)
2055		goto out;
2056	err = gss_svc_init();
2057	if (err)
2058		goto out_unregister;
2059	err = register_pernet_subsys(&rpcsec_gss_net_ops);
2060	if (err)
2061		goto out_svc_exit;
2062	rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version");
2063	return 0;
2064out_svc_exit:
2065	gss_svc_shutdown();
2066out_unregister:
2067	rpcauth_unregister(&authgss_ops);
2068out:
2069	return err;
2070}
2071
2072static void __exit exit_rpcsec_gss(void)
2073{
2074	unregister_pernet_subsys(&rpcsec_gss_net_ops);
2075	gss_svc_shutdown();
2076	rpcauth_unregister(&authgss_ops);
2077	rcu_barrier(); /* Wait for completion of call_rcu()'s */
2078}
2079
2080MODULE_ALIAS("rpc-auth-6");
2081MODULE_LICENSE("GPL");
2082module_param_named(expired_cred_retry_delay,
2083		   gss_expired_cred_retry_delay,
2084		   uint, 0644);
2085MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until "
2086		"the RPC engine retries an expired credential");
2087
2088module_param_named(key_expire_timeo,
2089		   gss_key_expire_timeo,
2090		   uint, 0644);
2091MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a "
2092		"credential keys lifetime where the NFS layer cleans up "
2093		"prior to key expiration");
2094
2095module_init(init_rpcsec_gss)
2096module_exit(exit_rpcsec_gss)