2 * linux/net/sunrpc/auth_gss/auth_gss.c
4 * RPCSEC_GSS client authentication.
6 * Copyright (c) 2000 The Regents of the University of Michigan.
9 * Dug Song <dugsong@monkey.org>
10 * Andy Adamson <andros@umich.edu>
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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.
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.
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 <linux/uaccess.h>
54 #include <linux/hashtable.h>
56 #include "auth_gss_internal.h"
59 static const struct rpc_authops authgss_ops;
61 static const struct rpc_credops gss_credops;
62 static const struct rpc_credops gss_nullops;
64 #define GSS_RETRY_EXPIRED 5
65 static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED;
67 #define GSS_KEY_EXPIRE_TIMEO 240
68 static unsigned int gss_key_expire_timeo = GSS_KEY_EXPIRE_TIMEO;
70 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
71 # define RPCDBG_FACILITY RPCDBG_AUTH
74 #define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2)
75 /* length of a krb5 verifier (48), plus data added before arguments when
76 * using integrity (two 4-byte integers): */
77 #define GSS_VERF_SLACK 100
79 static DEFINE_HASHTABLE(gss_auth_hash_table, 4);
80 static DEFINE_SPINLOCK(gss_auth_hash_lock);
83 struct rpc_pipe_dir_object pdo;
84 struct rpc_pipe *pipe;
85 struct rpc_clnt *clnt;
92 struct hlist_node hash;
93 struct rpc_auth rpc_auth;
94 struct gss_api_mech *mech;
95 enum rpc_gss_svc service;
96 struct rpc_clnt *client;
99 * There are two upcall pipes; dentry[1], named "gssd", is used
100 * for the new text-based upcall; dentry[0] is named after the
101 * mechanism (for example, "krb5") and exists for
102 * backwards-compatibility with older gssd's.
104 struct gss_pipe *gss_pipe[2];
105 const char *target_name;
108 /* pipe_version >= 0 if and only if someone has a pipe open. */
109 static DEFINE_SPINLOCK(pipe_version_lock);
110 static struct rpc_wait_queue pipe_version_rpc_waitqueue;
111 static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue);
112 static void gss_put_auth(struct gss_auth *gss_auth);
114 static void gss_free_ctx(struct gss_cl_ctx *);
115 static const struct rpc_pipe_ops gss_upcall_ops_v0;
116 static const struct rpc_pipe_ops gss_upcall_ops_v1;
118 static inline struct gss_cl_ctx *
119 gss_get_ctx(struct gss_cl_ctx *ctx)
121 refcount_inc(&ctx->count);
126 gss_put_ctx(struct gss_cl_ctx *ctx)
128 if (refcount_dec_and_test(&ctx->count))
133 * called by gss_upcall_callback and gss_create_upcall in order
134 * to set the gss context. The actual exchange of an old context
135 * and a new one is protected by the pipe->lock.
138 gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
140 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
142 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
145 rcu_assign_pointer(gss_cred->gc_ctx, ctx);
146 set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
147 smp_mb__before_atomic();
148 clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags);
151 static struct gss_cl_ctx *
152 gss_cred_get_ctx(struct rpc_cred *cred)
154 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
155 struct gss_cl_ctx *ctx = NULL;
158 ctx = rcu_dereference(gss_cred->gc_ctx);
165 static struct gss_cl_ctx *
166 gss_alloc_context(void)
168 struct gss_cl_ctx *ctx;
170 ctx = kzalloc(sizeof(*ctx), GFP_NOFS);
172 ctx->gc_proc = RPC_GSS_PROC_DATA;
173 ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */
174 spin_lock_init(&ctx->gc_seq_lock);
175 refcount_set(&ctx->count,1);
180 #define GSSD_MIN_TIMEOUT (60 * 60)
182 gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm)
186 unsigned int timeout;
187 unsigned long now = jiffies;
191 /* First unsigned int gives the remaining lifetime in seconds of the
192 * credential - e.g. the remaining TGT lifetime for Kerberos or
193 * the -t value passed to GSSD.
195 p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
199 timeout = GSSD_MIN_TIMEOUT;
200 ctx->gc_expiry = now + ((unsigned long)timeout * HZ);
201 /* Sequence number window. Determines the maximum number of
202 * simultaneous requests
204 p = simple_get_bytes(p, end, &window_size, sizeof(window_size));
207 ctx->gc_win = window_size;
208 /* gssd signals an error by passing ctx->gc_win = 0: */
209 if (ctx->gc_win == 0) {
211 * in which case, p points to an error code. Anything other
212 * than -EKEYEXPIRED gets converted to -EACCES.
214 p = simple_get_bytes(p, end, &ret, sizeof(ret));
216 p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) :
220 /* copy the opaque wire context */
221 p = simple_get_netobj(p, end, &ctx->gc_wire_ctx);
224 /* import the opaque security context */
225 p = simple_get_bytes(p, end, &seclen, sizeof(seclen));
228 q = (const void *)((const char *)p + seclen);
229 if (unlikely(q > end || q < p)) {
230 p = ERR_PTR(-EFAULT);
233 ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS);
239 /* is there any trailing data? */
245 /* pull in acceptor name (if there is one) */
246 p = simple_get_netobj(q, end, &ctx->gc_acceptor);
250 dprintk("RPC: %s Success. gc_expiry %lu now %lu timeout %u acceptor %.*s\n",
251 __func__, ctx->gc_expiry, now, timeout, ctx->gc_acceptor.len,
252 ctx->gc_acceptor.data);
255 dprintk("RPC: %s returns error %ld\n", __func__, -PTR_ERR(p));
259 /* XXX: Need some documentation about why UPCALL_BUF_LEN is so small.
260 * Is user space expecting no more than UPCALL_BUF_LEN bytes?
261 * Note that there are now _two_ NI_MAXHOST sized data items
262 * being passed in this string.
264 #define UPCALL_BUF_LEN 256
266 struct gss_upcall_msg {
269 struct rpc_pipe_msg msg;
270 struct list_head list;
271 struct gss_auth *auth;
272 struct rpc_pipe *pipe;
273 struct rpc_wait_queue rpc_waitqueue;
274 wait_queue_head_t waitqueue;
275 struct gss_cl_ctx *ctx;
276 char databuf[UPCALL_BUF_LEN];
279 static int get_pipe_version(struct net *net)
281 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
284 spin_lock(&pipe_version_lock);
285 if (sn->pipe_version >= 0) {
286 atomic_inc(&sn->pipe_users);
287 ret = sn->pipe_version;
290 spin_unlock(&pipe_version_lock);
294 static void put_pipe_version(struct net *net)
296 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
298 if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) {
299 sn->pipe_version = -1;
300 spin_unlock(&pipe_version_lock);
305 gss_release_msg(struct gss_upcall_msg *gss_msg)
307 struct net *net = gss_msg->auth->net;
308 if (!refcount_dec_and_test(&gss_msg->count))
310 put_pipe_version(net);
311 BUG_ON(!list_empty(&gss_msg->list));
312 if (gss_msg->ctx != NULL)
313 gss_put_ctx(gss_msg->ctx);
314 rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue);
315 gss_put_auth(gss_msg->auth);
319 static struct gss_upcall_msg *
320 __gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid, const struct gss_auth *auth)
322 struct gss_upcall_msg *pos;
323 list_for_each_entry(pos, &pipe->in_downcall, list) {
324 if (!uid_eq(pos->uid, uid))
326 if (auth && pos->auth->service != auth->service)
328 refcount_inc(&pos->count);
329 dprintk("RPC: %s found msg %p\n", __func__, pos);
332 dprintk("RPC: %s found nothing\n", __func__);
336 /* Try to add an upcall to the pipefs queue.
337 * If an upcall owned by our uid already exists, then we return a reference
338 * to that upcall instead of adding the new upcall.
340 static inline struct gss_upcall_msg *
341 gss_add_msg(struct gss_upcall_msg *gss_msg)
343 struct rpc_pipe *pipe = gss_msg->pipe;
344 struct gss_upcall_msg *old;
346 spin_lock(&pipe->lock);
347 old = __gss_find_upcall(pipe, gss_msg->uid, gss_msg->auth);
349 refcount_inc(&gss_msg->count);
350 list_add(&gss_msg->list, &pipe->in_downcall);
353 spin_unlock(&pipe->lock);
358 __gss_unhash_msg(struct gss_upcall_msg *gss_msg)
360 list_del_init(&gss_msg->list);
361 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
362 wake_up_all(&gss_msg->waitqueue);
363 refcount_dec(&gss_msg->count);
367 gss_unhash_msg(struct gss_upcall_msg *gss_msg)
369 struct rpc_pipe *pipe = gss_msg->pipe;
371 if (list_empty(&gss_msg->list))
373 spin_lock(&pipe->lock);
374 if (!list_empty(&gss_msg->list))
375 __gss_unhash_msg(gss_msg);
376 spin_unlock(&pipe->lock);
380 gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg)
382 switch (gss_msg->msg.errno) {
384 if (gss_msg->ctx == NULL)
386 clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
387 gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx);
390 set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
392 gss_cred->gc_upcall_timestamp = jiffies;
393 gss_cred->gc_upcall = NULL;
394 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
398 gss_upcall_callback(struct rpc_task *task)
400 struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred,
401 struct gss_cred, gc_base);
402 struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
403 struct rpc_pipe *pipe = gss_msg->pipe;
405 spin_lock(&pipe->lock);
406 gss_handle_downcall_result(gss_cred, gss_msg);
407 spin_unlock(&pipe->lock);
408 task->tk_status = gss_msg->msg.errno;
409 gss_release_msg(gss_msg);
412 static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg)
414 uid_t uid = from_kuid(&init_user_ns, gss_msg->uid);
415 memcpy(gss_msg->databuf, &uid, sizeof(uid));
416 gss_msg->msg.data = gss_msg->databuf;
417 gss_msg->msg.len = sizeof(uid);
419 BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf));
422 static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
423 const char *service_name,
424 const char *target_name)
426 struct gss_api_mech *mech = gss_msg->auth->mech;
427 char *p = gss_msg->databuf;
428 size_t buflen = sizeof(gss_msg->databuf);
431 len = scnprintf(p, buflen, "mech=%s uid=%d ", mech->gm_name,
432 from_kuid(&init_user_ns, gss_msg->uid));
435 gss_msg->msg.len = len;
438 * target= is a full service principal that names the remote
439 * identity that we are authenticating to.
442 len = scnprintf(p, buflen, "target=%s ", target_name);
445 gss_msg->msg.len += len;
449 * gssd uses service= and srchost= to select a matching key from
450 * the system's keytab to use as the source principal.
452 * service= is the service name part of the source principal,
453 * or "*" (meaning choose any).
455 * srchost= is the hostname part of the source principal. When
456 * not provided, gssd uses the local hostname.
459 char *c = strchr(service_name, '@');
462 len = scnprintf(p, buflen, "service=%s ",
465 len = scnprintf(p, buflen,
466 "service=%.*s srchost=%s ",
467 (int)(c - service_name),
468 service_name, c + 1);
471 gss_msg->msg.len += len;
474 if (mech->gm_upcall_enctypes) {
475 len = scnprintf(p, buflen, "enctypes=%s ",
476 mech->gm_upcall_enctypes);
479 gss_msg->msg.len += len;
481 len = scnprintf(p, buflen, "\n");
484 gss_msg->msg.len += len;
486 gss_msg->msg.data = gss_msg->databuf;
493 static struct gss_upcall_msg *
494 gss_alloc_msg(struct gss_auth *gss_auth,
495 kuid_t uid, const char *service_name)
497 struct gss_upcall_msg *gss_msg;
501 gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS);
504 vers = get_pipe_version(gss_auth->net);
508 gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe;
509 INIT_LIST_HEAD(&gss_msg->list);
510 rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
511 init_waitqueue_head(&gss_msg->waitqueue);
512 refcount_set(&gss_msg->count, 1);
514 gss_msg->auth = gss_auth;
517 gss_encode_v0_msg(gss_msg);
520 err = gss_encode_v1_msg(gss_msg, service_name, gss_auth->target_name);
522 goto err_put_pipe_version;
524 kref_get(&gss_auth->kref);
526 err_put_pipe_version:
527 put_pipe_version(gss_auth->net);
534 static struct gss_upcall_msg *
535 gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred)
537 struct gss_cred *gss_cred = container_of(cred,
538 struct gss_cred, gc_base);
539 struct gss_upcall_msg *gss_new, *gss_msg;
540 kuid_t uid = cred->cr_uid;
542 gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal);
545 gss_msg = gss_add_msg(gss_new);
546 if (gss_msg == gss_new) {
548 refcount_inc(&gss_msg->count);
549 res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg);
551 gss_unhash_msg(gss_new);
552 refcount_dec(&gss_msg->count);
553 gss_release_msg(gss_new);
554 gss_msg = ERR_PTR(res);
557 gss_release_msg(gss_new);
561 static void warn_gssd(void)
563 dprintk("AUTH_GSS upcall failed. Please check user daemon is running.\n");
567 gss_refresh_upcall(struct rpc_task *task)
569 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
570 struct gss_auth *gss_auth = container_of(cred->cr_auth,
571 struct gss_auth, rpc_auth);
572 struct gss_cred *gss_cred = container_of(cred,
573 struct gss_cred, gc_base);
574 struct gss_upcall_msg *gss_msg;
575 struct rpc_pipe *pipe;
578 dprintk("RPC: %5u %s for uid %u\n",
579 task->tk_pid, __func__, from_kuid(&init_user_ns, cred->cr_uid));
580 gss_msg = gss_setup_upcall(gss_auth, cred);
581 if (PTR_ERR(gss_msg) == -EAGAIN) {
582 /* XXX: warning on the first, under the assumption we
583 * shouldn't normally hit this case on a refresh. */
585 task->tk_timeout = 15*HZ;
586 rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL);
589 if (IS_ERR(gss_msg)) {
590 err = PTR_ERR(gss_msg);
593 pipe = gss_msg->pipe;
594 spin_lock(&pipe->lock);
595 if (gss_cred->gc_upcall != NULL)
596 rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
597 else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
598 task->tk_timeout = 0;
599 gss_cred->gc_upcall = gss_msg;
600 /* gss_upcall_callback will release the reference to gss_upcall_msg */
601 refcount_inc(&gss_msg->count);
602 rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback);
604 gss_handle_downcall_result(gss_cred, gss_msg);
605 err = gss_msg->msg.errno;
607 spin_unlock(&pipe->lock);
608 gss_release_msg(gss_msg);
610 dprintk("RPC: %5u %s for uid %u result %d\n",
611 task->tk_pid, __func__,
612 from_kuid(&init_user_ns, cred->cr_uid), err);
617 gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
619 struct net *net = gss_auth->net;
620 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
621 struct rpc_pipe *pipe;
622 struct rpc_cred *cred = &gss_cred->gc_base;
623 struct gss_upcall_msg *gss_msg;
627 dprintk("RPC: %s for uid %u\n",
628 __func__, from_kuid(&init_user_ns, cred->cr_uid));
631 /* if gssd is down, just skip upcalling altogether */
632 if (!gssd_running(net)) {
636 gss_msg = gss_setup_upcall(gss_auth, cred);
637 if (PTR_ERR(gss_msg) == -EAGAIN) {
638 err = wait_event_interruptible_timeout(pipe_version_waitqueue,
639 sn->pipe_version >= 0, 15 * HZ);
640 if (sn->pipe_version < 0) {
648 if (IS_ERR(gss_msg)) {
649 err = PTR_ERR(gss_msg);
652 pipe = gss_msg->pipe;
654 prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE);
655 spin_lock(&pipe->lock);
656 if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
659 spin_unlock(&pipe->lock);
660 if (fatal_signal_pending(current)) {
667 gss_cred_set_ctx(cred, gss_msg->ctx);
669 err = gss_msg->msg.errno;
670 spin_unlock(&pipe->lock);
672 finish_wait(&gss_msg->waitqueue, &wait);
673 gss_release_msg(gss_msg);
675 dprintk("RPC: %s for uid %u result %d\n",
676 __func__, from_kuid(&init_user_ns, cred->cr_uid), err);
680 #define MSG_BUF_MAXSIZE 1024
683 gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
687 struct gss_upcall_msg *gss_msg;
688 struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe;
689 struct gss_cl_ctx *ctx;
692 ssize_t err = -EFBIG;
694 if (mlen > MSG_BUF_MAXSIZE)
697 buf = kmalloc(mlen, GFP_NOFS);
702 if (copy_from_user(buf, src, mlen))
705 end = (const void *)((char *)buf + mlen);
706 p = simple_get_bytes(buf, end, &id, sizeof(id));
712 uid = make_kuid(&init_user_ns, id);
713 if (!uid_valid(uid)) {
719 ctx = gss_alloc_context();
724 /* Find a matching upcall */
725 spin_lock(&pipe->lock);
726 gss_msg = __gss_find_upcall(pipe, uid, NULL);
727 if (gss_msg == NULL) {
728 spin_unlock(&pipe->lock);
731 list_del_init(&gss_msg->list);
732 spin_unlock(&pipe->lock);
734 p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
740 gss_msg->msg.errno = err;
747 gss_msg->msg.errno = -EAGAIN;
750 printk(KERN_CRIT "%s: bad return from "
751 "gss_fill_context: %zd\n", __func__, err);
752 gss_msg->msg.errno = -EIO;
754 goto err_release_msg;
756 gss_msg->ctx = gss_get_ctx(ctx);
760 spin_lock(&pipe->lock);
761 __gss_unhash_msg(gss_msg);
762 spin_unlock(&pipe->lock);
763 gss_release_msg(gss_msg);
769 dprintk("RPC: %s returning %zd\n", __func__, err);
773 static int gss_pipe_open(struct inode *inode, int new_version)
775 struct net *net = inode->i_sb->s_fs_info;
776 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
779 spin_lock(&pipe_version_lock);
780 if (sn->pipe_version < 0) {
781 /* First open of any gss pipe determines the version: */
782 sn->pipe_version = new_version;
783 rpc_wake_up(&pipe_version_rpc_waitqueue);
784 wake_up(&pipe_version_waitqueue);
785 } else if (sn->pipe_version != new_version) {
786 /* Trying to open a pipe of a different version */
790 atomic_inc(&sn->pipe_users);
792 spin_unlock(&pipe_version_lock);
797 static int gss_pipe_open_v0(struct inode *inode)
799 return gss_pipe_open(inode, 0);
802 static int gss_pipe_open_v1(struct inode *inode)
804 return gss_pipe_open(inode, 1);
808 gss_pipe_release(struct inode *inode)
810 struct net *net = inode->i_sb->s_fs_info;
811 struct rpc_pipe *pipe = RPC_I(inode)->pipe;
812 struct gss_upcall_msg *gss_msg;
815 spin_lock(&pipe->lock);
816 list_for_each_entry(gss_msg, &pipe->in_downcall, list) {
818 if (!list_empty(&gss_msg->msg.list))
820 gss_msg->msg.errno = -EPIPE;
821 refcount_inc(&gss_msg->count);
822 __gss_unhash_msg(gss_msg);
823 spin_unlock(&pipe->lock);
824 gss_release_msg(gss_msg);
827 spin_unlock(&pipe->lock);
829 put_pipe_version(net);
833 gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
835 struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
837 if (msg->errno < 0) {
838 dprintk("RPC: %s releasing msg %p\n",
840 refcount_inc(&gss_msg->count);
841 gss_unhash_msg(gss_msg);
842 if (msg->errno == -ETIMEDOUT)
844 gss_release_msg(gss_msg);
846 gss_release_msg(gss_msg);
849 static void gss_pipe_dentry_destroy(struct dentry *dir,
850 struct rpc_pipe_dir_object *pdo)
852 struct gss_pipe *gss_pipe = pdo->pdo_data;
853 struct rpc_pipe *pipe = gss_pipe->pipe;
855 if (pipe->dentry != NULL) {
856 rpc_unlink(pipe->dentry);
861 static int gss_pipe_dentry_create(struct dentry *dir,
862 struct rpc_pipe_dir_object *pdo)
864 struct gss_pipe *p = pdo->pdo_data;
865 struct dentry *dentry;
867 dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe);
869 return PTR_ERR(dentry);
870 p->pipe->dentry = dentry;
874 static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = {
875 .create = gss_pipe_dentry_create,
876 .destroy = gss_pipe_dentry_destroy,
879 static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt,
881 const struct rpc_pipe_ops *upcall_ops)
886 p = kmalloc(sizeof(*p), GFP_KERNEL);
889 p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
890 if (IS_ERR(p->pipe)) {
891 err = PTR_ERR(p->pipe);
892 goto err_free_gss_pipe;
897 rpc_init_pipe_dir_object(&p->pdo,
898 &gss_pipe_dir_object_ops,
907 struct gss_alloc_pdo {
908 struct rpc_clnt *clnt;
910 const struct rpc_pipe_ops *upcall_ops;
913 static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data)
915 struct gss_pipe *gss_pipe;
916 struct gss_alloc_pdo *args = data;
918 if (pdo->pdo_ops != &gss_pipe_dir_object_ops)
920 gss_pipe = container_of(pdo, struct gss_pipe, pdo);
921 if (strcmp(gss_pipe->name, args->name) != 0)
923 if (!kref_get_unless_zero(&gss_pipe->kref))
928 static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data)
930 struct gss_pipe *gss_pipe;
931 struct gss_alloc_pdo *args = data;
933 gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops);
934 if (!IS_ERR(gss_pipe))
935 return &gss_pipe->pdo;
939 static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt,
941 const struct rpc_pipe_ops *upcall_ops)
943 struct net *net = rpc_net_ns(clnt);
944 struct rpc_pipe_dir_object *pdo;
945 struct gss_alloc_pdo args = {
948 .upcall_ops = upcall_ops,
951 pdo = rpc_find_or_alloc_pipe_dir_object(net,
952 &clnt->cl_pipedir_objects,
957 return container_of(pdo, struct gss_pipe, pdo);
958 return ERR_PTR(-ENOMEM);
961 static void __gss_pipe_free(struct gss_pipe *p)
963 struct rpc_clnt *clnt = p->clnt;
964 struct net *net = rpc_net_ns(clnt);
966 rpc_remove_pipe_dir_object(net,
967 &clnt->cl_pipedir_objects,
969 rpc_destroy_pipe_data(p->pipe);
973 static void __gss_pipe_release(struct kref *kref)
975 struct gss_pipe *p = container_of(kref, struct gss_pipe, kref);
980 static void gss_pipe_free(struct gss_pipe *p)
983 kref_put(&p->kref, __gss_pipe_release);
987 * NOTE: we have the opportunity to use different
988 * parameters based on the input flavor (which must be a pseudoflavor)
990 static struct gss_auth *
991 gss_create_new(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
993 rpc_authflavor_t flavor = args->pseudoflavor;
994 struct gss_auth *gss_auth;
995 struct gss_pipe *gss_pipe;
996 struct rpc_auth * auth;
997 int err = -ENOMEM; /* XXX? */
999 dprintk("RPC: creating GSS authenticator for client %p\n", clnt);
1001 if (!try_module_get(THIS_MODULE))
1002 return ERR_PTR(err);
1003 if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
1005 INIT_HLIST_NODE(&gss_auth->hash);
1006 gss_auth->target_name = NULL;
1007 if (args->target_name) {
1008 gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL);
1009 if (gss_auth->target_name == NULL)
1012 gss_auth->client = clnt;
1013 gss_auth->net = get_net(rpc_net_ns(clnt));
1015 gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
1016 if (!gss_auth->mech) {
1017 dprintk("RPC: Pseudoflavor %d not found!\n", flavor);
1020 gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
1021 if (gss_auth->service == 0)
1023 if (!gssd_running(gss_auth->net))
1025 auth = &gss_auth->rpc_auth;
1026 auth->au_cslack = GSS_CRED_SLACK >> 2;
1027 auth->au_rslack = GSS_VERF_SLACK >> 2;
1029 auth->au_ops = &authgss_ops;
1030 auth->au_flavor = flavor;
1031 if (gss_pseudoflavor_to_datatouch(gss_auth->mech, flavor))
1032 auth->au_flags |= RPCAUTH_AUTH_DATATOUCH;
1033 atomic_set(&auth->au_count, 1);
1034 kref_init(&gss_auth->kref);
1036 err = rpcauth_init_credcache(auth);
1040 * Note: if we created the old pipe first, then someone who
1041 * examined the directory at the right moment might conclude
1042 * that we supported only the old pipe. So we instead create
1043 * the new pipe first.
1045 gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1);
1046 if (IS_ERR(gss_pipe)) {
1047 err = PTR_ERR(gss_pipe);
1048 goto err_destroy_credcache;
1050 gss_auth->gss_pipe[1] = gss_pipe;
1052 gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name,
1053 &gss_upcall_ops_v0);
1054 if (IS_ERR(gss_pipe)) {
1055 err = PTR_ERR(gss_pipe);
1056 goto err_destroy_pipe_1;
1058 gss_auth->gss_pipe[0] = gss_pipe;
1062 gss_pipe_free(gss_auth->gss_pipe[1]);
1063 err_destroy_credcache:
1064 rpcauth_destroy_credcache(auth);
1066 gss_mech_put(gss_auth->mech);
1068 put_net(gss_auth->net);
1070 kfree(gss_auth->target_name);
1073 module_put(THIS_MODULE);
1074 return ERR_PTR(err);
1078 gss_free(struct gss_auth *gss_auth)
1080 gss_pipe_free(gss_auth->gss_pipe[0]);
1081 gss_pipe_free(gss_auth->gss_pipe[1]);
1082 gss_mech_put(gss_auth->mech);
1083 put_net(gss_auth->net);
1084 kfree(gss_auth->target_name);
1087 module_put(THIS_MODULE);
1091 gss_free_callback(struct kref *kref)
1093 struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref);
1099 gss_put_auth(struct gss_auth *gss_auth)
1101 kref_put(&gss_auth->kref, gss_free_callback);
1105 gss_destroy(struct rpc_auth *auth)
1107 struct gss_auth *gss_auth = container_of(auth,
1108 struct gss_auth, rpc_auth);
1110 dprintk("RPC: destroying GSS authenticator %p flavor %d\n",
1111 auth, auth->au_flavor);
1113 if (hash_hashed(&gss_auth->hash)) {
1114 spin_lock(&gss_auth_hash_lock);
1115 hash_del(&gss_auth->hash);
1116 spin_unlock(&gss_auth_hash_lock);
1119 gss_pipe_free(gss_auth->gss_pipe[0]);
1120 gss_auth->gss_pipe[0] = NULL;
1121 gss_pipe_free(gss_auth->gss_pipe[1]);
1122 gss_auth->gss_pipe[1] = NULL;
1123 rpcauth_destroy_credcache(auth);
1125 gss_put_auth(gss_auth);
1129 * Auths may be shared between rpc clients that were cloned from a
1130 * common client with the same xprt, if they also share the flavor and
1133 * The auth is looked up from the oldest parent sharing the same
1134 * cl_xprt, and the auth itself references only that common parent
1135 * (which is guaranteed to last as long as any of its descendants).
1137 static struct gss_auth *
1138 gss_auth_find_or_add_hashed(const struct rpc_auth_create_args *args,
1139 struct rpc_clnt *clnt,
1140 struct gss_auth *new)
1142 struct gss_auth *gss_auth;
1143 unsigned long hashval = (unsigned long)clnt;
1145 spin_lock(&gss_auth_hash_lock);
1146 hash_for_each_possible(gss_auth_hash_table,
1150 if (gss_auth->client != clnt)
1152 if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor)
1154 if (gss_auth->target_name != args->target_name) {
1155 if (gss_auth->target_name == NULL)
1157 if (args->target_name == NULL)
1159 if (strcmp(gss_auth->target_name, args->target_name))
1162 if (!atomic_inc_not_zero(&gss_auth->rpc_auth.au_count))
1167 hash_add(gss_auth_hash_table, &new->hash, hashval);
1170 spin_unlock(&gss_auth_hash_lock);
1174 static struct gss_auth *
1175 gss_create_hashed(const struct rpc_auth_create_args *args,
1176 struct rpc_clnt *clnt)
1178 struct gss_auth *gss_auth;
1179 struct gss_auth *new;
1181 gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL);
1182 if (gss_auth != NULL)
1184 new = gss_create_new(args, clnt);
1187 gss_auth = gss_auth_find_or_add_hashed(args, clnt, new);
1188 if (gss_auth != new)
1189 gss_destroy(&new->rpc_auth);
1194 static struct rpc_auth *
1195 gss_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
1197 struct gss_auth *gss_auth;
1198 struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch);
1200 while (clnt != clnt->cl_parent) {
1201 struct rpc_clnt *parent = clnt->cl_parent;
1202 /* Find the original parent for this transport */
1203 if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps)
1208 gss_auth = gss_create_hashed(args, clnt);
1209 if (IS_ERR(gss_auth))
1210 return ERR_CAST(gss_auth);
1211 return &gss_auth->rpc_auth;
1215 * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call
1216 * to the server with the GSS control procedure field set to
1217 * RPC_GSS_PROC_DESTROY. This should normally cause the server to release
1218 * all RPCSEC_GSS state associated with that context.
1221 gss_destroying_context(struct rpc_cred *cred)
1223 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1224 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
1225 struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1);
1226 struct rpc_task *task;
1228 if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
1231 ctx->gc_proc = RPC_GSS_PROC_DESTROY;
1232 cred->cr_ops = &gss_nullops;
1234 /* Take a reference to ensure the cred will be destroyed either
1235 * by the RPC call or by the put_rpccred() below */
1238 task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT);
1246 /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure
1247 * to create a new cred or context, so they check that things have been
1248 * allocated before freeing them. */
1250 gss_do_free_ctx(struct gss_cl_ctx *ctx)
1252 dprintk("RPC: %s\n", __func__);
1254 gss_delete_sec_context(&ctx->gc_gss_ctx);
1255 kfree(ctx->gc_wire_ctx.data);
1256 kfree(ctx->gc_acceptor.data);
1261 gss_free_ctx_callback(struct rcu_head *head)
1263 struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu);
1264 gss_do_free_ctx(ctx);
1268 gss_free_ctx(struct gss_cl_ctx *ctx)
1270 call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
1274 gss_free_cred(struct gss_cred *gss_cred)
1276 dprintk("RPC: %s cred=%p\n", __func__, gss_cred);
1281 gss_free_cred_callback(struct rcu_head *head)
1283 struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu);
1284 gss_free_cred(gss_cred);
1288 gss_destroy_nullcred(struct rpc_cred *cred)
1290 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1291 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
1292 struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1);
1294 RCU_INIT_POINTER(gss_cred->gc_ctx, NULL);
1295 call_rcu(&cred->cr_rcu, gss_free_cred_callback);
1298 gss_put_auth(gss_auth);
1302 gss_destroy_cred(struct rpc_cred *cred)
1305 if (gss_destroying_context(cred))
1307 gss_destroy_nullcred(cred);
1311 gss_hash_cred(struct auth_cred *acred, unsigned int hashbits)
1313 return hash_64(from_kuid(&init_user_ns, acred->uid), hashbits);
1317 * Lookup RPCSEC_GSS cred for the current process
1319 static struct rpc_cred *
1320 gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
1322 return rpcauth_lookup_credcache(auth, acred, flags, GFP_NOFS);
1325 static struct rpc_cred *
1326 gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags, gfp_t gfp)
1328 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
1329 struct gss_cred *cred = NULL;
1332 dprintk("RPC: %s for uid %d, flavor %d\n",
1333 __func__, from_kuid(&init_user_ns, acred->uid),
1336 if (!(cred = kzalloc(sizeof(*cred), gfp)))
1339 rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops);
1341 * Note: in order to force a call to call_refresh(), we deliberately
1342 * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
1344 cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
1345 cred->gc_service = gss_auth->service;
1346 cred->gc_principal = NULL;
1347 if (acred->machine_cred)
1348 cred->gc_principal = acred->principal;
1349 kref_get(&gss_auth->kref);
1350 return &cred->gc_base;
1353 dprintk("RPC: %s failed with error %d\n", __func__, err);
1354 return ERR_PTR(err);
1358 gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred)
1360 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
1361 struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base);
1365 err = gss_create_upcall(gss_auth, gss_cred);
1366 } while (err == -EAGAIN);
1371 gss_stringify_acceptor(struct rpc_cred *cred)
1373 char *string = NULL;
1374 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1375 struct gss_cl_ctx *ctx;
1377 struct xdr_netobj *acceptor;
1380 ctx = rcu_dereference(gss_cred->gc_ctx);
1384 len = ctx->gc_acceptor.len;
1387 /* no point if there's no string */
1391 string = kmalloc(len + 1, GFP_KERNEL);
1396 ctx = rcu_dereference(gss_cred->gc_ctx);
1398 /* did the ctx disappear or was it replaced by one with no acceptor? */
1399 if (!ctx || !ctx->gc_acceptor.len) {
1405 acceptor = &ctx->gc_acceptor;
1408 * Did we find a new acceptor that's longer than the original? Allocate
1409 * a longer buffer and try again.
1411 if (len < acceptor->len) {
1412 len = acceptor->len;
1418 memcpy(string, acceptor->data, acceptor->len);
1419 string[acceptor->len] = '\0';
1426 * Returns -EACCES if GSS context is NULL or will expire within the
1427 * timeout (miliseconds)
1430 gss_key_timeout(struct rpc_cred *rc)
1432 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
1433 struct gss_cl_ctx *ctx;
1434 unsigned long timeout = jiffies + (gss_key_expire_timeo * HZ);
1438 ctx = rcu_dereference(gss_cred->gc_ctx);
1439 if (!ctx || time_after(timeout, ctx->gc_expiry))
1447 gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
1449 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
1450 struct gss_cl_ctx *ctx;
1453 if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
1455 /* Don't match with creds that have expired. */
1457 ctx = rcu_dereference(gss_cred->gc_ctx);
1458 if (!ctx || time_after(jiffies, ctx->gc_expiry)) {
1463 if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
1466 if (acred->principal != NULL) {
1467 if (gss_cred->gc_principal == NULL)
1469 ret = strcmp(acred->principal, gss_cred->gc_principal) == 0;
1472 if (gss_cred->gc_principal != NULL)
1474 ret = uid_eq(rc->cr_uid, acred->uid);
1480 /* Notify acred users of GSS context expiration timeout */
1481 if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags) &&
1482 (gss_key_timeout(rc) != 0)) {
1483 /* test will now be done from generic cred */
1484 test_and_clear_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags);
1485 /* tell NFS layer that key will expire soon */
1486 set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags);
1492 * Marshal credentials.
1493 * Maybe we should keep a cached credential for performance reasons.
1496 gss_marshal(struct rpc_task *task, __be32 *p)
1498 struct rpc_rqst *req = task->tk_rqstp;
1499 struct rpc_cred *cred = req->rq_cred;
1500 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1502 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1505 struct xdr_netobj mic;
1507 struct xdr_buf verf_buf;
1509 dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1511 *p++ = htonl(RPC_AUTH_GSS);
1514 spin_lock(&ctx->gc_seq_lock);
1515 req->rq_seqno = ctx->gc_seq++;
1516 spin_unlock(&ctx->gc_seq_lock);
1518 *p++ = htonl((u32) RPC_GSS_VERSION);
1519 *p++ = htonl((u32) ctx->gc_proc);
1520 *p++ = htonl((u32) req->rq_seqno);
1521 *p++ = htonl((u32) gss_cred->gc_service);
1522 p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
1523 *cred_len = htonl((p - (cred_len + 1)) << 2);
1525 /* We compute the checksum for the verifier over the xdr-encoded bytes
1526 * starting with the xid and ending at the end of the credential: */
1527 iov.iov_base = xprt_skip_transport_header(req->rq_xprt,
1528 req->rq_snd_buf.head[0].iov_base);
1529 iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
1530 xdr_buf_from_iov(&iov, &verf_buf);
1532 /* set verifier flavor*/
1533 *p++ = htonl(RPC_AUTH_GSS);
1535 mic.data = (u8 *)(p + 1);
1536 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1537 if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
1538 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1539 } else if (maj_stat != 0) {
1540 printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
1543 p = xdr_encode_opaque(p, NULL, mic.len);
1551 static int gss_renew_cred(struct rpc_task *task)
1553 struct rpc_cred *oldcred = task->tk_rqstp->rq_cred;
1554 struct gss_cred *gss_cred = container_of(oldcred,
1557 struct rpc_auth *auth = oldcred->cr_auth;
1558 struct auth_cred acred = {
1559 .uid = oldcred->cr_uid,
1560 .principal = gss_cred->gc_principal,
1561 .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0),
1563 struct rpc_cred *new;
1565 new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
1567 return PTR_ERR(new);
1568 task->tk_rqstp->rq_cred = new;
1569 put_rpccred(oldcred);
1573 static int gss_cred_is_negative_entry(struct rpc_cred *cred)
1575 if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) {
1576 unsigned long now = jiffies;
1577 unsigned long begin, expire;
1578 struct gss_cred *gss_cred;
1580 gss_cred = container_of(cred, struct gss_cred, gc_base);
1581 begin = gss_cred->gc_upcall_timestamp;
1582 expire = begin + gss_expired_cred_retry_delay * HZ;
1584 if (time_in_range_open(now, begin, expire))
1591 * Refresh credentials. XXX - finish
1594 gss_refresh(struct rpc_task *task)
1596 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1599 if (gss_cred_is_negative_entry(cred))
1600 return -EKEYEXPIRED;
1602 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
1603 !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) {
1604 ret = gss_renew_cred(task);
1607 cred = task->tk_rqstp->rq_cred;
1610 if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
1611 ret = gss_refresh_upcall(task);
1616 /* Dummy refresh routine: used only when destroying the context */
1618 gss_refresh_null(struct rpc_task *task)
1624 gss_validate(struct rpc_task *task, __be32 *p)
1626 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1627 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1630 struct xdr_buf verf_buf;
1631 struct xdr_netobj mic;
1634 __be32 *ret = ERR_PTR(-EIO);
1636 dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1639 if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
1641 if (flav != RPC_AUTH_GSS)
1643 seq = kmalloc(4, GFP_NOFS);
1646 *seq = htonl(task->tk_rqstp->rq_seqno);
1649 xdr_buf_from_iov(&iov, &verf_buf);
1653 ret = ERR_PTR(-EACCES);
1654 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1655 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1656 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1658 dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n",
1659 task->tk_pid, __func__, maj_stat);
1662 /* We leave it to unwrap to calculate au_rslack. For now we just
1663 * calculate the length of the verifier: */
1664 cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
1666 dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n",
1667 task->tk_pid, __func__);
1669 return p + XDR_QUADLEN(len);
1672 dprintk("RPC: %5u %s failed ret %ld.\n", task->tk_pid, __func__,
1678 static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp,
1679 __be32 *p, void *obj)
1681 struct xdr_stream xdr;
1683 xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p);
1684 encode(rqstp, &xdr, obj);
1688 gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1689 kxdreproc_t encode, struct rpc_rqst *rqstp,
1690 __be32 *p, void *obj)
1692 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1693 struct xdr_buf integ_buf;
1694 __be32 *integ_len = NULL;
1695 struct xdr_netobj mic;
1703 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1704 *p++ = htonl(rqstp->rq_seqno);
1706 gss_wrap_req_encode(encode, rqstp, p, obj);
1708 if (xdr_buf_subsegment(snd_buf, &integ_buf,
1709 offset, snd_buf->len - offset))
1711 *integ_len = htonl(integ_buf.len);
1713 /* guess whether we're in the head or the tail: */
1714 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1715 iov = snd_buf->tail;
1717 iov = snd_buf->head;
1718 p = iov->iov_base + iov->iov_len;
1719 mic.data = (u8 *)(p + 1);
1721 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1722 status = -EIO; /* XXX? */
1723 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1724 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1727 q = xdr_encode_opaque(p, NULL, mic.len);
1729 offset = (u8 *)q - (u8 *)p;
1730 iov->iov_len += offset;
1731 snd_buf->len += offset;
1736 priv_release_snd_buf(struct rpc_rqst *rqstp)
1740 for (i=0; i < rqstp->rq_enc_pages_num; i++)
1741 __free_page(rqstp->rq_enc_pages[i]);
1742 kfree(rqstp->rq_enc_pages);
1743 rqstp->rq_release_snd_buf = NULL;
1747 alloc_enc_pages(struct rpc_rqst *rqstp)
1749 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1752 if (rqstp->rq_release_snd_buf)
1753 rqstp->rq_release_snd_buf(rqstp);
1755 if (snd_buf->page_len == 0) {
1756 rqstp->rq_enc_pages_num = 0;
1760 first = snd_buf->page_base >> PAGE_SHIFT;
1761 last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_SHIFT;
1762 rqstp->rq_enc_pages_num = last - first + 1 + 1;
1764 = kmalloc_array(rqstp->rq_enc_pages_num,
1765 sizeof(struct page *),
1767 if (!rqstp->rq_enc_pages)
1769 for (i=0; i < rqstp->rq_enc_pages_num; i++) {
1770 rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS);
1771 if (rqstp->rq_enc_pages[i] == NULL)
1774 rqstp->rq_release_snd_buf = priv_release_snd_buf;
1777 rqstp->rq_enc_pages_num = i;
1778 priv_release_snd_buf(rqstp);
1784 gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1785 kxdreproc_t encode, struct rpc_rqst *rqstp,
1786 __be32 *p, void *obj)
1788 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1793 struct page **inpages;
1800 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1801 *p++ = htonl(rqstp->rq_seqno);
1803 gss_wrap_req_encode(encode, rqstp, p, obj);
1805 status = alloc_enc_pages(rqstp);
1808 first = snd_buf->page_base >> PAGE_SHIFT;
1809 inpages = snd_buf->pages + first;
1810 snd_buf->pages = rqstp->rq_enc_pages;
1811 snd_buf->page_base -= first << PAGE_SHIFT;
1813 * Give the tail its own page, in case we need extra space in the
1814 * head when wrapping:
1816 * call_allocate() allocates twice the slack space required
1817 * by the authentication flavor to rq_callsize.
1818 * For GSS, slack is GSS_CRED_SLACK.
1820 if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
1821 tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]);
1822 memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len);
1823 snd_buf->tail[0].iov_base = tmp;
1825 maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
1826 /* slack space should prevent this ever happening: */
1827 BUG_ON(snd_buf->len > snd_buf->buflen);
1829 /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was
1830 * done anyway, so it's safe to put the request on the wire: */
1831 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1832 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1836 *opaque_len = htonl(snd_buf->len - offset);
1837 /* guess whether we're in the head or the tail: */
1838 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1839 iov = snd_buf->tail;
1841 iov = snd_buf->head;
1842 p = iov->iov_base + iov->iov_len;
1843 pad = 3 - ((snd_buf->len - offset - 1) & 3);
1845 iov->iov_len += pad;
1846 snd_buf->len += pad;
1852 gss_wrap_req(struct rpc_task *task,
1853 kxdreproc_t encode, void *rqstp, __be32 *p, void *obj)
1855 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1856 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1858 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1861 dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1862 if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
1863 /* The spec seems a little ambiguous here, but I think that not
1864 * wrapping context destruction requests makes the most sense.
1866 gss_wrap_req_encode(encode, rqstp, p, obj);
1870 switch (gss_cred->gc_service) {
1871 case RPC_GSS_SVC_NONE:
1872 gss_wrap_req_encode(encode, rqstp, p, obj);
1875 case RPC_GSS_SVC_INTEGRITY:
1876 status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj);
1878 case RPC_GSS_SVC_PRIVACY:
1879 status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj);
1884 dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status);
1889 gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1890 struct rpc_rqst *rqstp, __be32 **p)
1892 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1893 struct xdr_buf integ_buf;
1894 struct xdr_netobj mic;
1895 u32 data_offset, mic_offset;
1900 integ_len = ntohl(*(*p)++);
1903 data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1904 mic_offset = integ_len + data_offset;
1905 if (mic_offset > rcv_buf->len)
1907 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1910 if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset,
1911 mic_offset - data_offset))
1914 if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset))
1917 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1918 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1919 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1920 if (maj_stat != GSS_S_COMPLETE)
1926 gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1927 struct rpc_rqst *rqstp, __be32 **p)
1929 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1935 opaque_len = ntohl(*(*p)++);
1936 offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1937 if (offset + opaque_len > rcv_buf->len)
1939 /* remove padding: */
1940 rcv_buf->len = offset + opaque_len;
1942 maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
1943 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1944 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1945 if (maj_stat != GSS_S_COMPLETE)
1947 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1954 gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp,
1955 __be32 *p, void *obj)
1957 struct xdr_stream xdr;
1959 xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
1960 return decode(rqstp, &xdr, obj);
1964 gss_unwrap_resp(struct rpc_task *task,
1965 kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj)
1967 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1968 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1970 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1972 struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head;
1973 int savedlen = head->iov_len;
1976 if (ctx->gc_proc != RPC_GSS_PROC_DATA)
1978 switch (gss_cred->gc_service) {
1979 case RPC_GSS_SVC_NONE:
1981 case RPC_GSS_SVC_INTEGRITY:
1982 status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p);
1986 case RPC_GSS_SVC_PRIVACY:
1987 status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p);
1992 /* take into account extra slack for integrity and privacy cases: */
1993 cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp)
1994 + (savedlen - head->iov_len);
1996 status = gss_unwrap_req_decode(decode, rqstp, p, obj);
1999 dprintk("RPC: %5u %s returning %d\n",
2000 task->tk_pid, __func__, status);
2004 static const struct rpc_authops authgss_ops = {
2005 .owner = THIS_MODULE,
2006 .au_flavor = RPC_AUTH_GSS,
2007 .au_name = "RPCSEC_GSS",
2008 .create = gss_create,
2009 .destroy = gss_destroy,
2010 .hash_cred = gss_hash_cred,
2011 .lookup_cred = gss_lookup_cred,
2012 .crcreate = gss_create_cred,
2013 .list_pseudoflavors = gss_mech_list_pseudoflavors,
2014 .info2flavor = gss_mech_info2flavor,
2015 .flavor2info = gss_mech_flavor2info,
2018 static const struct rpc_credops gss_credops = {
2019 .cr_name = "AUTH_GSS",
2020 .crdestroy = gss_destroy_cred,
2021 .cr_init = gss_cred_init,
2022 .crbind = rpcauth_generic_bind_cred,
2023 .crmatch = gss_match,
2024 .crmarshal = gss_marshal,
2025 .crrefresh = gss_refresh,
2026 .crvalidate = gss_validate,
2027 .crwrap_req = gss_wrap_req,
2028 .crunwrap_resp = gss_unwrap_resp,
2029 .crkey_timeout = gss_key_timeout,
2030 .crstringify_acceptor = gss_stringify_acceptor,
2033 static const struct rpc_credops gss_nullops = {
2034 .cr_name = "AUTH_GSS",
2035 .crdestroy = gss_destroy_nullcred,
2036 .crbind = rpcauth_generic_bind_cred,
2037 .crmatch = gss_match,
2038 .crmarshal = gss_marshal,
2039 .crrefresh = gss_refresh_null,
2040 .crvalidate = gss_validate,
2041 .crwrap_req = gss_wrap_req,
2042 .crunwrap_resp = gss_unwrap_resp,
2043 .crstringify_acceptor = gss_stringify_acceptor,
2046 static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
2047 .upcall = rpc_pipe_generic_upcall,
2048 .downcall = gss_pipe_downcall,
2049 .destroy_msg = gss_pipe_destroy_msg,
2050 .open_pipe = gss_pipe_open_v0,
2051 .release_pipe = gss_pipe_release,
2054 static const struct rpc_pipe_ops gss_upcall_ops_v1 = {
2055 .upcall = rpc_pipe_generic_upcall,
2056 .downcall = gss_pipe_downcall,
2057 .destroy_msg = gss_pipe_destroy_msg,
2058 .open_pipe = gss_pipe_open_v1,
2059 .release_pipe = gss_pipe_release,
2062 static __net_init int rpcsec_gss_init_net(struct net *net)
2064 return gss_svc_init_net(net);
2067 static __net_exit void rpcsec_gss_exit_net(struct net *net)
2069 gss_svc_shutdown_net(net);
2072 static struct pernet_operations rpcsec_gss_net_ops = {
2073 .init = rpcsec_gss_init_net,
2074 .exit = rpcsec_gss_exit_net,
2078 * Initialize RPCSEC_GSS module
2080 static int __init init_rpcsec_gss(void)
2084 err = rpcauth_register(&authgss_ops);
2087 err = gss_svc_init();
2089 goto out_unregister;
2090 err = register_pernet_subsys(&rpcsec_gss_net_ops);
2093 rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version");
2098 rpcauth_unregister(&authgss_ops);
2103 static void __exit exit_rpcsec_gss(void)
2105 unregister_pernet_subsys(&rpcsec_gss_net_ops);
2107 rpcauth_unregister(&authgss_ops);
2108 rcu_barrier(); /* Wait for completion of call_rcu()'s */
2111 MODULE_ALIAS("rpc-auth-6");
2112 MODULE_LICENSE("GPL");
2113 module_param_named(expired_cred_retry_delay,
2114 gss_expired_cred_retry_delay,
2116 MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until "
2117 "the RPC engine retries an expired credential");
2119 module_param_named(key_expire_timeo,
2120 gss_key_expire_timeo,
2122 MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a "
2123 "credential keys lifetime where the NFS layer cleans up "
2124 "prior to key expiration");
2126 module_init(init_rpcsec_gss)
2127 module_exit(exit_rpcsec_gss)