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 <asm/uaccess.h>
54 #include <linux/hashtable.h>
58 static const struct rpc_authops authgss_ops;
60 static const struct rpc_credops gss_credops;
61 static const struct rpc_credops gss_nullops;
63 #define GSS_RETRY_EXPIRED 5
64 static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED;
66 #define GSS_KEY_EXPIRE_TIMEO 240
67 static unsigned int gss_key_expire_timeo = GSS_KEY_EXPIRE_TIMEO;
70 # define RPCDBG_FACILITY RPCDBG_AUTH
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
78 static DEFINE_HASHTABLE(gss_auth_hash_table, 4);
79 static DEFINE_SPINLOCK(gss_auth_hash_lock);
82 struct rpc_pipe_dir_object pdo;
83 struct rpc_pipe *pipe;
84 struct rpc_clnt *clnt;
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;
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.
103 struct gss_pipe *gss_pipe[2];
104 const char *target_name;
107 /* pipe_version >= 0 if and only if someone has a pipe open. */
108 static DEFINE_SPINLOCK(pipe_version_lock);
109 static struct rpc_wait_queue pipe_version_rpc_waitqueue;
110 static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue);
111 static void gss_put_auth(struct gss_auth *gss_auth);
113 static void gss_free_ctx(struct gss_cl_ctx *);
114 static const struct rpc_pipe_ops gss_upcall_ops_v0;
115 static const struct rpc_pipe_ops gss_upcall_ops_v1;
117 static inline struct gss_cl_ctx *
118 gss_get_ctx(struct gss_cl_ctx *ctx)
120 atomic_inc(&ctx->count);
125 gss_put_ctx(struct gss_cl_ctx *ctx)
127 if (atomic_dec_and_test(&ctx->count))
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.
137 gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
139 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
141 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
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);
151 simple_get_bytes(const void *p, const void *end, void *res, size_t len)
153 const void *q = (const void *)((const char *)p + len);
154 if (unlikely(q > end || q < p))
155 return ERR_PTR(-EFAULT);
160 static inline const void *
161 simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
166 p = simple_get_bytes(p, end, &len, sizeof(len));
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);
179 static struct gss_cl_ctx *
180 gss_cred_get_ctx(struct rpc_cred *cred)
182 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
183 struct gss_cl_ctx *ctx = NULL;
186 ctx = rcu_dereference(gss_cred->gc_ctx);
193 static struct gss_cl_ctx *
194 gss_alloc_context(void)
196 struct gss_cl_ctx *ctx;
198 ctx = kzalloc(sizeof(*ctx), GFP_NOFS);
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);
208 #define GSSD_MIN_TIMEOUT (60 * 60)
210 gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm)
214 unsigned int timeout;
215 unsigned long now = jiffies;
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.
223 p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
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
232 p = simple_get_bytes(p, end, &window_size, sizeof(window_size));
235 ctx->gc_win = window_size;
236 /* gssd signals an error by passing ctx->gc_win = 0: */
237 if (ctx->gc_win == 0) {
239 * in which case, p points to an error code. Anything other
240 * than -EKEYEXPIRED gets converted to -EACCES.
242 p = simple_get_bytes(p, end, &ret, sizeof(ret));
244 p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) :
248 /* copy the opaque wire context */
249 p = simple_get_netobj(p, end, &ctx->gc_wire_ctx);
252 /* import the opaque security context */
253 p = simple_get_bytes(p, end, &seclen, sizeof(seclen));
256 q = (const void *)((const char *)p + seclen);
257 if (unlikely(q > end || q < p)) {
258 p = ERR_PTR(-EFAULT);
261 ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS);
267 /* is there any trailing data? */
273 /* pull in acceptor name (if there is one) */
274 p = simple_get_netobj(q, end, &ctx->gc_acceptor);
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);
283 dprintk("RPC: %s returns error %ld\n", __func__, -PTR_ERR(p));
287 #define UPCALL_BUF_LEN 128
289 struct gss_upcall_msg {
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];
302 static int get_pipe_version(struct net *net)
304 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
307 spin_lock(&pipe_version_lock);
308 if (sn->pipe_version >= 0) {
309 atomic_inc(&sn->pipe_users);
310 ret = sn->pipe_version;
313 spin_unlock(&pipe_version_lock);
317 static void put_pipe_version(struct net *net)
319 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
321 if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) {
322 sn->pipe_version = -1;
323 spin_unlock(&pipe_version_lock);
328 gss_release_msg(struct gss_upcall_msg *gss_msg)
330 struct net *net = gss_msg->auth->net;
331 if (!atomic_dec_and_test(&gss_msg->count))
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);
342 static struct gss_upcall_msg *
343 __gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid)
345 struct gss_upcall_msg *pos;
346 list_for_each_entry(pos, &pipe->in_downcall, list) {
347 if (!uid_eq(pos->uid, uid))
349 atomic_inc(&pos->count);
350 dprintk("RPC: %s found msg %p\n", __func__, pos);
353 dprintk("RPC: %s found nothing\n", __func__);
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.
361 static inline struct gss_upcall_msg *
362 gss_add_msg(struct gss_upcall_msg *gss_msg)
364 struct rpc_pipe *pipe = gss_msg->pipe;
365 struct gss_upcall_msg *old;
367 spin_lock(&pipe->lock);
368 old = __gss_find_upcall(pipe, gss_msg->uid);
370 atomic_inc(&gss_msg->count);
371 list_add(&gss_msg->list, &pipe->in_downcall);
374 spin_unlock(&pipe->lock);
379 __gss_unhash_msg(struct gss_upcall_msg *gss_msg)
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);
388 gss_unhash_msg(struct gss_upcall_msg *gss_msg)
390 struct rpc_pipe *pipe = gss_msg->pipe;
392 if (list_empty(&gss_msg->list))
394 spin_lock(&pipe->lock);
395 if (!list_empty(&gss_msg->list))
396 __gss_unhash_msg(gss_msg);
397 spin_unlock(&pipe->lock);
401 gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg)
403 switch (gss_msg->msg.errno) {
405 if (gss_msg->ctx == NULL)
407 clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
408 gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx);
411 set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
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);
419 gss_upcall_callback(struct rpc_task *task)
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;
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);
433 static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg)
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);
440 BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf));
443 static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
444 const char *service_name,
445 const char *target_name)
447 struct gss_api_mech *mech = gss_msg->auth->mech;
448 char *p = gss_msg->databuf;
449 size_t buflen = sizeof(gss_msg->databuf);
452 len = scnprintf(p, buflen, "mech=%s uid=%d ", mech->gm_name,
453 from_kuid(&init_user_ns, gss_msg->uid));
456 gss_msg->msg.len = len;
458 len = scnprintf(p, buflen, "target=%s ", target_name);
461 gss_msg->msg.len += len;
463 if (service_name != NULL) {
464 len = scnprintf(p, buflen, "service=%s ", service_name);
467 gss_msg->msg.len += len;
469 if (mech->gm_upcall_enctypes) {
470 len = scnprintf(p, buflen, "enctypes=%s ",
471 mech->gm_upcall_enctypes);
474 gss_msg->msg.len += len;
476 len = scnprintf(p, buflen, "\n");
479 gss_msg->msg.len += len;
481 gss_msg->msg.data = gss_msg->databuf;
488 static struct gss_upcall_msg *
489 gss_alloc_msg(struct gss_auth *gss_auth,
490 kuid_t uid, const char *service_name)
492 struct gss_upcall_msg *gss_msg;
496 gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS);
499 vers = get_pipe_version(gss_auth->net);
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);
509 gss_msg->auth = gss_auth;
512 gss_encode_v0_msg(gss_msg);
515 err = gss_encode_v1_msg(gss_msg, service_name, gss_auth->target_name);
517 goto err_put_pipe_version;
519 kref_get(&gss_auth->kref);
521 err_put_pipe_version:
522 put_pipe_version(gss_auth->net);
529 static struct gss_upcall_msg *
530 gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred)
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;
537 gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal);
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);
544 gss_unhash_msg(gss_new);
545 gss_msg = ERR_PTR(res);
548 gss_release_msg(gss_new);
552 static void warn_gssd(void)
554 dprintk("AUTH_GSS upcall failed. Please check user daemon is running.\n");
558 gss_refresh_upcall(struct rpc_task *task)
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;
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. */
576 task->tk_timeout = 15*HZ;
577 rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL);
580 if (IS_ERR(gss_msg)) {
581 err = PTR_ERR(gss_msg);
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);
595 gss_handle_downcall_result(gss_cred, gss_msg);
596 err = gss_msg->msg.errno;
598 spin_unlock(&pipe->lock);
599 gss_release_msg(gss_msg);
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);
608 gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
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;
618 dprintk("RPC: %s for uid %u\n",
619 __func__, from_kuid(&init_user_ns, cred->cr_uid));
622 /* if gssd is down, just skip upcalling altogether */
623 if (!gssd_running(net)) {
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) {
639 if (IS_ERR(gss_msg)) {
640 err = PTR_ERR(gss_msg);
643 pipe = gss_msg->pipe;
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) {
650 spin_unlock(&pipe->lock);
651 if (fatal_signal_pending(current)) {
658 gss_cred_set_ctx(cred, gss_msg->ctx);
660 err = gss_msg->msg.errno;
661 spin_unlock(&pipe->lock);
663 finish_wait(&gss_msg->waitqueue, &wait);
664 gss_release_msg(gss_msg);
666 dprintk("RPC: %s for uid %u result %d\n",
667 __func__, from_kuid(&init_user_ns, cred->cr_uid), err);
671 #define MSG_BUF_MAXSIZE 1024
674 gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
678 struct gss_upcall_msg *gss_msg;
679 struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe;
680 struct gss_cl_ctx *ctx;
683 ssize_t err = -EFBIG;
685 if (mlen > MSG_BUF_MAXSIZE)
688 buf = kmalloc(mlen, GFP_NOFS);
693 if (copy_from_user(buf, src, mlen))
696 end = (const void *)((char *)buf + mlen);
697 p = simple_get_bytes(buf, end, &id, sizeof(id));
703 uid = make_kuid(&init_user_ns, id);
704 if (!uid_valid(uid)) {
710 ctx = gss_alloc_context();
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);
722 list_del_init(&gss_msg->list);
723 spin_unlock(&pipe->lock);
725 p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
731 gss_msg->msg.errno = err;
738 gss_msg->msg.errno = -EAGAIN;
741 printk(KERN_CRIT "%s: bad return from "
742 "gss_fill_context: %zd\n", __func__, err);
745 goto err_release_msg;
747 gss_msg->ctx = gss_get_ctx(ctx);
751 spin_lock(&pipe->lock);
752 __gss_unhash_msg(gss_msg);
753 spin_unlock(&pipe->lock);
754 gss_release_msg(gss_msg);
760 dprintk("RPC: %s returning %Zd\n", __func__, err);
764 static int gss_pipe_open(struct inode *inode, int new_version)
766 struct net *net = inode->i_sb->s_fs_info;
767 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
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 */
781 atomic_inc(&sn->pipe_users);
783 spin_unlock(&pipe_version_lock);
788 static int gss_pipe_open_v0(struct inode *inode)
790 return gss_pipe_open(inode, 0);
793 static int gss_pipe_open_v1(struct inode *inode)
795 return gss_pipe_open(inode, 1);
799 gss_pipe_release(struct inode *inode)
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;
806 spin_lock(&pipe->lock);
807 list_for_each_entry(gss_msg, &pipe->in_downcall, list) {
809 if (!list_empty(&gss_msg->msg.list))
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);
818 spin_unlock(&pipe->lock);
820 put_pipe_version(net);
824 gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
826 struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
828 if (msg->errno < 0) {
829 dprintk("RPC: %s releasing msg %p\n",
831 atomic_inc(&gss_msg->count);
832 gss_unhash_msg(gss_msg);
833 if (msg->errno == -ETIMEDOUT)
835 gss_release_msg(gss_msg);
839 static void gss_pipe_dentry_destroy(struct dentry *dir,
840 struct rpc_pipe_dir_object *pdo)
842 struct gss_pipe *gss_pipe = pdo->pdo_data;
843 struct rpc_pipe *pipe = gss_pipe->pipe;
845 if (pipe->dentry != NULL) {
846 rpc_unlink(pipe->dentry);
851 static int gss_pipe_dentry_create(struct dentry *dir,
852 struct rpc_pipe_dir_object *pdo)
854 struct gss_pipe *p = pdo->pdo_data;
855 struct dentry *dentry;
857 dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe);
859 return PTR_ERR(dentry);
860 p->pipe->dentry = dentry;
864 static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = {
865 .create = gss_pipe_dentry_create,
866 .destroy = gss_pipe_dentry_destroy,
869 static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt,
871 const struct rpc_pipe_ops *upcall_ops)
876 p = kmalloc(sizeof(*p), GFP_KERNEL);
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;
887 rpc_init_pipe_dir_object(&p->pdo,
888 &gss_pipe_dir_object_ops,
897 struct gss_alloc_pdo {
898 struct rpc_clnt *clnt;
900 const struct rpc_pipe_ops *upcall_ops;
903 static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data)
905 struct gss_pipe *gss_pipe;
906 struct gss_alloc_pdo *args = data;
908 if (pdo->pdo_ops != &gss_pipe_dir_object_ops)
910 gss_pipe = container_of(pdo, struct gss_pipe, pdo);
911 if (strcmp(gss_pipe->name, args->name) != 0)
913 if (!kref_get_unless_zero(&gss_pipe->kref))
918 static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data)
920 struct gss_pipe *gss_pipe;
921 struct gss_alloc_pdo *args = data;
923 gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops);
924 if (!IS_ERR(gss_pipe))
925 return &gss_pipe->pdo;
929 static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt,
931 const struct rpc_pipe_ops *upcall_ops)
933 struct net *net = rpc_net_ns(clnt);
934 struct rpc_pipe_dir_object *pdo;
935 struct gss_alloc_pdo args = {
938 .upcall_ops = upcall_ops,
941 pdo = rpc_find_or_alloc_pipe_dir_object(net,
942 &clnt->cl_pipedir_objects,
947 return container_of(pdo, struct gss_pipe, pdo);
948 return ERR_PTR(-ENOMEM);
951 static void __gss_pipe_free(struct gss_pipe *p)
953 struct rpc_clnt *clnt = p->clnt;
954 struct net *net = rpc_net_ns(clnt);
956 rpc_remove_pipe_dir_object(net,
957 &clnt->cl_pipedir_objects,
959 rpc_destroy_pipe_data(p->pipe);
963 static void __gss_pipe_release(struct kref *kref)
965 struct gss_pipe *p = container_of(kref, struct gss_pipe, kref);
970 static void gss_pipe_free(struct gss_pipe *p)
973 kref_put(&p->kref, __gss_pipe_release);
977 * NOTE: we have the opportunity to use different
978 * parameters based on the input flavor (which must be a pseudoflavor)
980 static struct gss_auth *
981 gss_create_new(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
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? */
989 dprintk("RPC: creating GSS authenticator for client %p\n", clnt);
991 if (!try_module_get(THIS_MODULE))
993 if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
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)
1002 gss_auth->client = clnt;
1003 gss_auth->net = get_net(rpc_net_ns(clnt));
1005 gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
1006 if (!gss_auth->mech) {
1007 dprintk("RPC: Pseudoflavor %d not found!\n", flavor);
1010 gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
1011 if (gss_auth->service == 0)
1013 if (!gssd_running(gss_auth->net))
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);
1023 err = rpcauth_init_credcache(auth);
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.
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;
1037 gss_auth->gss_pipe[1] = gss_pipe;
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;
1045 gss_auth->gss_pipe[0] = gss_pipe;
1049 gss_pipe_free(gss_auth->gss_pipe[1]);
1050 err_destroy_credcache:
1051 rpcauth_destroy_credcache(auth);
1053 gss_mech_put(gss_auth->mech);
1055 put_net(gss_auth->net);
1057 kfree(gss_auth->target_name);
1060 module_put(THIS_MODULE);
1061 return ERR_PTR(err);
1065 gss_free(struct gss_auth *gss_auth)
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);
1074 module_put(THIS_MODULE);
1078 gss_free_callback(struct kref *kref)
1080 struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref);
1086 gss_put_auth(struct gss_auth *gss_auth)
1088 kref_put(&gss_auth->kref, gss_free_callback);
1092 gss_destroy(struct rpc_auth *auth)
1094 struct gss_auth *gss_auth = container_of(auth,
1095 struct gss_auth, rpc_auth);
1097 dprintk("RPC: destroying GSS authenticator %p flavor %d\n",
1098 auth, auth->au_flavor);
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);
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);
1112 gss_put_auth(gss_auth);
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
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).
1124 static struct gss_auth *
1125 gss_auth_find_or_add_hashed(struct rpc_auth_create_args *args,
1126 struct rpc_clnt *clnt,
1127 struct gss_auth *new)
1129 struct gss_auth *gss_auth;
1130 unsigned long hashval = (unsigned long)clnt;
1132 spin_lock(&gss_auth_hash_lock);
1133 hash_for_each_possible(gss_auth_hash_table,
1137 if (gss_auth->client != clnt)
1139 if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor)
1141 if (gss_auth->target_name != args->target_name) {
1142 if (gss_auth->target_name == NULL)
1144 if (args->target_name == NULL)
1146 if (strcmp(gss_auth->target_name, args->target_name))
1149 if (!atomic_inc_not_zero(&gss_auth->rpc_auth.au_count))
1154 hash_add(gss_auth_hash_table, &new->hash, hashval);
1157 spin_unlock(&gss_auth_hash_lock);
1161 static struct gss_auth *
1162 gss_create_hashed(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
1164 struct gss_auth *gss_auth;
1165 struct gss_auth *new;
1167 gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL);
1168 if (gss_auth != NULL)
1170 new = gss_create_new(args, clnt);
1173 gss_auth = gss_auth_find_or_add_hashed(args, clnt, new);
1174 if (gss_auth != new)
1175 gss_destroy(&new->rpc_auth);
1180 static struct rpc_auth *
1181 gss_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
1183 struct gss_auth *gss_auth;
1184 struct rpc_xprt *xprt = rcu_access_pointer(clnt->cl_xprt);
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_xprt) != xprt)
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;
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.
1207 gss_destroying_context(struct rpc_cred *cred)
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;
1214 if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
1217 ctx->gc_proc = RPC_GSS_PROC_DESTROY;
1218 cred->cr_ops = &gss_nullops;
1220 /* Take a reference to ensure the cred will be destroyed either
1221 * by the RPC call or by the put_rpccred() below */
1224 task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT);
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. */
1236 gss_do_free_ctx(struct gss_cl_ctx *ctx)
1238 dprintk("RPC: %s\n", __func__);
1240 gss_delete_sec_context(&ctx->gc_gss_ctx);
1241 kfree(ctx->gc_wire_ctx.data);
1242 kfree(ctx->gc_acceptor.data);
1247 gss_free_ctx_callback(struct rcu_head *head)
1249 struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu);
1250 gss_do_free_ctx(ctx);
1254 gss_free_ctx(struct gss_cl_ctx *ctx)
1256 call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
1260 gss_free_cred(struct gss_cred *gss_cred)
1262 dprintk("RPC: %s cred=%p\n", __func__, gss_cred);
1267 gss_free_cred_callback(struct rcu_head *head)
1269 struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu);
1270 gss_free_cred(gss_cred);
1274 gss_destroy_nullcred(struct rpc_cred *cred)
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);
1280 RCU_INIT_POINTER(gss_cred->gc_ctx, NULL);
1281 call_rcu(&cred->cr_rcu, gss_free_cred_callback);
1284 gss_put_auth(gss_auth);
1288 gss_destroy_cred(struct rpc_cred *cred)
1291 if (gss_destroying_context(cred))
1293 gss_destroy_nullcred(cred);
1297 * Lookup RPCSEC_GSS cred for the current process
1299 static struct rpc_cred *
1300 gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
1302 return rpcauth_lookup_credcache(auth, acred, flags);
1305 static struct rpc_cred *
1306 gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
1308 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
1309 struct gss_cred *cred = NULL;
1312 dprintk("RPC: %s for uid %d, flavor %d\n",
1313 __func__, from_kuid(&init_user_ns, acred->uid),
1316 if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS)))
1319 rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops);
1321 * Note: in order to force a call to call_refresh(), we deliberately
1322 * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
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;
1333 dprintk("RPC: %s failed with error %d\n", __func__, err);
1334 return ERR_PTR(err);
1338 gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred)
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);
1345 err = gss_create_upcall(gss_auth, gss_cred);
1346 } while (err == -EAGAIN);
1351 gss_stringify_acceptor(struct rpc_cred *cred)
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 struct xdr_netobj *acceptor;
1359 ctx = rcu_dereference(gss_cred->gc_ctx);
1363 acceptor = &ctx->gc_acceptor;
1365 /* no point if there's no string */
1369 string = kmalloc(acceptor->len + 1, GFP_KERNEL);
1373 memcpy(string, acceptor->data, acceptor->len);
1374 string[acceptor->len] = '\0';
1381 * Returns -EACCES if GSS context is NULL or will expire within the
1382 * timeout (miliseconds)
1385 gss_key_timeout(struct rpc_cred *rc)
1387 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
1388 struct gss_cl_ctx *ctx;
1389 unsigned long now = jiffies;
1390 unsigned long expire;
1393 ctx = rcu_dereference(gss_cred->gc_ctx);
1395 expire = ctx->gc_expiry - (gss_key_expire_timeo * HZ);
1397 if (!ctx || time_after(now, expire))
1403 gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
1405 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
1406 struct gss_cl_ctx *ctx;
1409 if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
1411 /* Don't match with creds that have expired. */
1413 ctx = rcu_dereference(gss_cred->gc_ctx);
1414 if (!ctx || time_after(jiffies, ctx->gc_expiry)) {
1419 if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
1422 if (acred->principal != NULL) {
1423 if (gss_cred->gc_principal == NULL)
1425 ret = strcmp(acred->principal, gss_cred->gc_principal) == 0;
1428 if (gss_cred->gc_principal != NULL)
1430 ret = uid_eq(rc->cr_uid, acred->uid);
1436 /* Notify acred users of GSS context expiration timeout */
1437 if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags) &&
1438 (gss_key_timeout(rc) != 0)) {
1439 /* test will now be done from generic cred */
1440 test_and_clear_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags);
1441 /* tell NFS layer that key will expire soon */
1442 set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags);
1448 * Marshal credentials.
1449 * Maybe we should keep a cached credential for performance reasons.
1452 gss_marshal(struct rpc_task *task, __be32 *p)
1454 struct rpc_rqst *req = task->tk_rqstp;
1455 struct rpc_cred *cred = req->rq_cred;
1456 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1458 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1461 struct xdr_netobj mic;
1463 struct xdr_buf verf_buf;
1465 dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1467 *p++ = htonl(RPC_AUTH_GSS);
1470 spin_lock(&ctx->gc_seq_lock);
1471 req->rq_seqno = ctx->gc_seq++;
1472 spin_unlock(&ctx->gc_seq_lock);
1474 *p++ = htonl((u32) RPC_GSS_VERSION);
1475 *p++ = htonl((u32) ctx->gc_proc);
1476 *p++ = htonl((u32) req->rq_seqno);
1477 *p++ = htonl((u32) gss_cred->gc_service);
1478 p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
1479 *cred_len = htonl((p - (cred_len + 1)) << 2);
1481 /* We compute the checksum for the verifier over the xdr-encoded bytes
1482 * starting with the xid and ending at the end of the credential: */
1483 iov.iov_base = xprt_skip_transport_header(req->rq_xprt,
1484 req->rq_snd_buf.head[0].iov_base);
1485 iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
1486 xdr_buf_from_iov(&iov, &verf_buf);
1488 /* set verifier flavor*/
1489 *p++ = htonl(RPC_AUTH_GSS);
1491 mic.data = (u8 *)(p + 1);
1492 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1493 if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
1494 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1495 } else if (maj_stat != 0) {
1496 printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
1499 p = xdr_encode_opaque(p, NULL, mic.len);
1507 static int gss_renew_cred(struct rpc_task *task)
1509 struct rpc_cred *oldcred = task->tk_rqstp->rq_cred;
1510 struct gss_cred *gss_cred = container_of(oldcred,
1513 struct rpc_auth *auth = oldcred->cr_auth;
1514 struct auth_cred acred = {
1515 .uid = oldcred->cr_uid,
1516 .principal = gss_cred->gc_principal,
1517 .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0),
1519 struct rpc_cred *new;
1521 new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
1523 return PTR_ERR(new);
1524 task->tk_rqstp->rq_cred = new;
1525 put_rpccred(oldcred);
1529 static int gss_cred_is_negative_entry(struct rpc_cred *cred)
1531 if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) {
1532 unsigned long now = jiffies;
1533 unsigned long begin, expire;
1534 struct gss_cred *gss_cred;
1536 gss_cred = container_of(cred, struct gss_cred, gc_base);
1537 begin = gss_cred->gc_upcall_timestamp;
1538 expire = begin + gss_expired_cred_retry_delay * HZ;
1540 if (time_in_range_open(now, begin, expire))
1547 * Refresh credentials. XXX - finish
1550 gss_refresh(struct rpc_task *task)
1552 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1555 if (gss_cred_is_negative_entry(cred))
1556 return -EKEYEXPIRED;
1558 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
1559 !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) {
1560 ret = gss_renew_cred(task);
1563 cred = task->tk_rqstp->rq_cred;
1566 if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
1567 ret = gss_refresh_upcall(task);
1572 /* Dummy refresh routine: used only when destroying the context */
1574 gss_refresh_null(struct rpc_task *task)
1580 gss_validate(struct rpc_task *task, __be32 *p)
1582 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1583 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1586 struct xdr_buf verf_buf;
1587 struct xdr_netobj mic;
1590 __be32 *ret = ERR_PTR(-EIO);
1592 dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1595 if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
1597 if (flav != RPC_AUTH_GSS)
1599 seq = htonl(task->tk_rqstp->rq_seqno);
1600 iov.iov_base = &seq;
1601 iov.iov_len = sizeof(seq);
1602 xdr_buf_from_iov(&iov, &verf_buf);
1606 ret = ERR_PTR(-EACCES);
1607 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1608 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1609 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1611 dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n",
1612 task->tk_pid, __func__, maj_stat);
1615 /* We leave it to unwrap to calculate au_rslack. For now we just
1616 * calculate the length of the verifier: */
1617 cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
1619 dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n",
1620 task->tk_pid, __func__);
1621 return p + XDR_QUADLEN(len);
1624 dprintk("RPC: %5u %s failed ret %ld.\n", task->tk_pid, __func__,
1629 static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp,
1630 __be32 *p, void *obj)
1632 struct xdr_stream xdr;
1634 xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p);
1635 encode(rqstp, &xdr, obj);
1639 gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1640 kxdreproc_t encode, struct rpc_rqst *rqstp,
1641 __be32 *p, void *obj)
1643 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1644 struct xdr_buf integ_buf;
1645 __be32 *integ_len = NULL;
1646 struct xdr_netobj mic;
1654 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1655 *p++ = htonl(rqstp->rq_seqno);
1657 gss_wrap_req_encode(encode, rqstp, p, obj);
1659 if (xdr_buf_subsegment(snd_buf, &integ_buf,
1660 offset, snd_buf->len - offset))
1662 *integ_len = htonl(integ_buf.len);
1664 /* guess whether we're in the head or the tail: */
1665 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1666 iov = snd_buf->tail;
1668 iov = snd_buf->head;
1669 p = iov->iov_base + iov->iov_len;
1670 mic.data = (u8 *)(p + 1);
1672 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1673 status = -EIO; /* XXX? */
1674 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1675 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1678 q = xdr_encode_opaque(p, NULL, mic.len);
1680 offset = (u8 *)q - (u8 *)p;
1681 iov->iov_len += offset;
1682 snd_buf->len += offset;
1687 priv_release_snd_buf(struct rpc_rqst *rqstp)
1691 for (i=0; i < rqstp->rq_enc_pages_num; i++)
1692 __free_page(rqstp->rq_enc_pages[i]);
1693 kfree(rqstp->rq_enc_pages);
1697 alloc_enc_pages(struct rpc_rqst *rqstp)
1699 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1702 if (snd_buf->page_len == 0) {
1703 rqstp->rq_enc_pages_num = 0;
1707 first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
1708 last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT;
1709 rqstp->rq_enc_pages_num = last - first + 1 + 1;
1711 = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *),
1713 if (!rqstp->rq_enc_pages)
1715 for (i=0; i < rqstp->rq_enc_pages_num; i++) {
1716 rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS);
1717 if (rqstp->rq_enc_pages[i] == NULL)
1720 rqstp->rq_release_snd_buf = priv_release_snd_buf;
1723 rqstp->rq_enc_pages_num = i;
1724 priv_release_snd_buf(rqstp);
1730 gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1731 kxdreproc_t encode, struct rpc_rqst *rqstp,
1732 __be32 *p, void *obj)
1734 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1739 struct page **inpages;
1746 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1747 *p++ = htonl(rqstp->rq_seqno);
1749 gss_wrap_req_encode(encode, rqstp, p, obj);
1751 status = alloc_enc_pages(rqstp);
1754 first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
1755 inpages = snd_buf->pages + first;
1756 snd_buf->pages = rqstp->rq_enc_pages;
1757 snd_buf->page_base -= first << PAGE_CACHE_SHIFT;
1759 * Give the tail its own page, in case we need extra space in the
1760 * head when wrapping:
1762 * call_allocate() allocates twice the slack space required
1763 * by the authentication flavor to rq_callsize.
1764 * For GSS, slack is GSS_CRED_SLACK.
1766 if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
1767 tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]);
1768 memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len);
1769 snd_buf->tail[0].iov_base = tmp;
1771 maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
1772 /* slack space should prevent this ever happening: */
1773 BUG_ON(snd_buf->len > snd_buf->buflen);
1775 /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was
1776 * done anyway, so it's safe to put the request on the wire: */
1777 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1778 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1782 *opaque_len = htonl(snd_buf->len - offset);
1783 /* guess whether we're in the head or the tail: */
1784 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1785 iov = snd_buf->tail;
1787 iov = snd_buf->head;
1788 p = iov->iov_base + iov->iov_len;
1789 pad = 3 - ((snd_buf->len - offset - 1) & 3);
1791 iov->iov_len += pad;
1792 snd_buf->len += pad;
1798 gss_wrap_req(struct rpc_task *task,
1799 kxdreproc_t encode, void *rqstp, __be32 *p, void *obj)
1801 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1802 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1804 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1807 dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1808 if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
1809 /* The spec seems a little ambiguous here, but I think that not
1810 * wrapping context destruction requests makes the most sense.
1812 gss_wrap_req_encode(encode, rqstp, p, obj);
1816 switch (gss_cred->gc_service) {
1817 case RPC_GSS_SVC_NONE:
1818 gss_wrap_req_encode(encode, rqstp, p, obj);
1821 case RPC_GSS_SVC_INTEGRITY:
1822 status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj);
1824 case RPC_GSS_SVC_PRIVACY:
1825 status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj);
1830 dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status);
1835 gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1836 struct rpc_rqst *rqstp, __be32 **p)
1838 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1839 struct xdr_buf integ_buf;
1840 struct xdr_netobj mic;
1841 u32 data_offset, mic_offset;
1846 integ_len = ntohl(*(*p)++);
1849 data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1850 mic_offset = integ_len + data_offset;
1851 if (mic_offset > rcv_buf->len)
1853 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1856 if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset,
1857 mic_offset - data_offset))
1860 if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset))
1863 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1864 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1865 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1866 if (maj_stat != GSS_S_COMPLETE)
1872 gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1873 struct rpc_rqst *rqstp, __be32 **p)
1875 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1881 opaque_len = ntohl(*(*p)++);
1882 offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1883 if (offset + opaque_len > rcv_buf->len)
1885 /* remove padding: */
1886 rcv_buf->len = offset + opaque_len;
1888 maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
1889 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1890 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1891 if (maj_stat != GSS_S_COMPLETE)
1893 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1900 gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp,
1901 __be32 *p, void *obj)
1903 struct xdr_stream xdr;
1905 xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
1906 return decode(rqstp, &xdr, obj);
1910 gss_unwrap_resp(struct rpc_task *task,
1911 kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj)
1913 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1914 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1916 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1918 struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head;
1919 int savedlen = head->iov_len;
1922 if (ctx->gc_proc != RPC_GSS_PROC_DATA)
1924 switch (gss_cred->gc_service) {
1925 case RPC_GSS_SVC_NONE:
1927 case RPC_GSS_SVC_INTEGRITY:
1928 status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p);
1932 case RPC_GSS_SVC_PRIVACY:
1933 status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p);
1938 /* take into account extra slack for integrity and privacy cases: */
1939 cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp)
1940 + (savedlen - head->iov_len);
1942 status = gss_unwrap_req_decode(decode, rqstp, p, obj);
1945 dprintk("RPC: %5u %s returning %d\n",
1946 task->tk_pid, __func__, status);
1950 static const struct rpc_authops authgss_ops = {
1951 .owner = THIS_MODULE,
1952 .au_flavor = RPC_AUTH_GSS,
1953 .au_name = "RPCSEC_GSS",
1954 .create = gss_create,
1955 .destroy = gss_destroy,
1956 .lookup_cred = gss_lookup_cred,
1957 .crcreate = gss_create_cred,
1958 .list_pseudoflavors = gss_mech_list_pseudoflavors,
1959 .info2flavor = gss_mech_info2flavor,
1960 .flavor2info = gss_mech_flavor2info,
1963 static const struct rpc_credops gss_credops = {
1964 .cr_name = "AUTH_GSS",
1965 .crdestroy = gss_destroy_cred,
1966 .cr_init = gss_cred_init,
1967 .crbind = rpcauth_generic_bind_cred,
1968 .crmatch = gss_match,
1969 .crmarshal = gss_marshal,
1970 .crrefresh = gss_refresh,
1971 .crvalidate = gss_validate,
1972 .crwrap_req = gss_wrap_req,
1973 .crunwrap_resp = gss_unwrap_resp,
1974 .crkey_timeout = gss_key_timeout,
1975 .crstringify_acceptor = gss_stringify_acceptor,
1978 static const struct rpc_credops gss_nullops = {
1979 .cr_name = "AUTH_GSS",
1980 .crdestroy = gss_destroy_nullcred,
1981 .crbind = rpcauth_generic_bind_cred,
1982 .crmatch = gss_match,
1983 .crmarshal = gss_marshal,
1984 .crrefresh = gss_refresh_null,
1985 .crvalidate = gss_validate,
1986 .crwrap_req = gss_wrap_req,
1987 .crunwrap_resp = gss_unwrap_resp,
1988 .crstringify_acceptor = gss_stringify_acceptor,
1991 static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
1992 .upcall = rpc_pipe_generic_upcall,
1993 .downcall = gss_pipe_downcall,
1994 .destroy_msg = gss_pipe_destroy_msg,
1995 .open_pipe = gss_pipe_open_v0,
1996 .release_pipe = gss_pipe_release,
1999 static const struct rpc_pipe_ops gss_upcall_ops_v1 = {
2000 .upcall = rpc_pipe_generic_upcall,
2001 .downcall = gss_pipe_downcall,
2002 .destroy_msg = gss_pipe_destroy_msg,
2003 .open_pipe = gss_pipe_open_v1,
2004 .release_pipe = gss_pipe_release,
2007 static __net_init int rpcsec_gss_init_net(struct net *net)
2009 return gss_svc_init_net(net);
2012 static __net_exit void rpcsec_gss_exit_net(struct net *net)
2014 gss_svc_shutdown_net(net);
2017 static struct pernet_operations rpcsec_gss_net_ops = {
2018 .init = rpcsec_gss_init_net,
2019 .exit = rpcsec_gss_exit_net,
2023 * Initialize RPCSEC_GSS module
2025 static int __init init_rpcsec_gss(void)
2029 err = rpcauth_register(&authgss_ops);
2032 err = gss_svc_init();
2034 goto out_unregister;
2035 err = register_pernet_subsys(&rpcsec_gss_net_ops);
2038 rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version");
2043 rpcauth_unregister(&authgss_ops);
2048 static void __exit exit_rpcsec_gss(void)
2050 unregister_pernet_subsys(&rpcsec_gss_net_ops);
2052 rpcauth_unregister(&authgss_ops);
2053 rcu_barrier(); /* Wait for completion of call_rcu()'s */
2056 MODULE_ALIAS("rpc-auth-6");
2057 MODULE_LICENSE("GPL");
2058 module_param_named(expired_cred_retry_delay,
2059 gss_expired_cred_retry_delay,
2061 MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until "
2062 "the RPC engine retries an expired credential");
2064 module_param_named(key_expire_timeo,
2065 gss_key_expire_timeo,
2067 MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a "
2068 "credential keys lifetime where the NFS layer cleans up "
2069 "prior to key expiration");
2071 module_init(init_rpcsec_gss)
2072 module_exit(exit_rpcsec_gss)