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>
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 atomic_inc(&ctx->count);
126 gss_put_ctx(struct gss_cl_ctx *ctx)
128 if (atomic_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 atomic_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 #define UPCALL_BUF_LEN 128
261 struct gss_upcall_msg {
264 struct rpc_pipe_msg msg;
265 struct list_head list;
266 struct gss_auth *auth;
267 struct rpc_pipe *pipe;
268 struct rpc_wait_queue rpc_waitqueue;
269 wait_queue_head_t waitqueue;
270 struct gss_cl_ctx *ctx;
271 char databuf[UPCALL_BUF_LEN];
274 static int get_pipe_version(struct net *net)
276 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
279 spin_lock(&pipe_version_lock);
280 if (sn->pipe_version >= 0) {
281 atomic_inc(&sn->pipe_users);
282 ret = sn->pipe_version;
285 spin_unlock(&pipe_version_lock);
289 static void put_pipe_version(struct net *net)
291 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
293 if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) {
294 sn->pipe_version = -1;
295 spin_unlock(&pipe_version_lock);
300 gss_release_msg(struct gss_upcall_msg *gss_msg)
302 struct net *net = gss_msg->auth->net;
303 if (!atomic_dec_and_test(&gss_msg->count))
305 put_pipe_version(net);
306 BUG_ON(!list_empty(&gss_msg->list));
307 if (gss_msg->ctx != NULL)
308 gss_put_ctx(gss_msg->ctx);
309 rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue);
310 gss_put_auth(gss_msg->auth);
314 static struct gss_upcall_msg *
315 __gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid, const struct gss_auth *auth)
317 struct gss_upcall_msg *pos;
318 list_for_each_entry(pos, &pipe->in_downcall, list) {
319 if (!uid_eq(pos->uid, uid))
321 if (auth && pos->auth->service != auth->service)
323 atomic_inc(&pos->count);
324 dprintk("RPC: %s found msg %p\n", __func__, pos);
327 dprintk("RPC: %s found nothing\n", __func__);
331 /* Try to add an upcall to the pipefs queue.
332 * If an upcall owned by our uid already exists, then we return a reference
333 * to that upcall instead of adding the new upcall.
335 static inline struct gss_upcall_msg *
336 gss_add_msg(struct gss_upcall_msg *gss_msg)
338 struct rpc_pipe *pipe = gss_msg->pipe;
339 struct gss_upcall_msg *old;
341 spin_lock(&pipe->lock);
342 old = __gss_find_upcall(pipe, gss_msg->uid, gss_msg->auth);
344 atomic_inc(&gss_msg->count);
345 list_add(&gss_msg->list, &pipe->in_downcall);
348 spin_unlock(&pipe->lock);
353 __gss_unhash_msg(struct gss_upcall_msg *gss_msg)
355 list_del_init(&gss_msg->list);
356 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
357 wake_up_all(&gss_msg->waitqueue);
358 atomic_dec(&gss_msg->count);
362 gss_unhash_msg(struct gss_upcall_msg *gss_msg)
364 struct rpc_pipe *pipe = gss_msg->pipe;
366 if (list_empty(&gss_msg->list))
368 spin_lock(&pipe->lock);
369 if (!list_empty(&gss_msg->list))
370 __gss_unhash_msg(gss_msg);
371 spin_unlock(&pipe->lock);
375 gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg)
377 switch (gss_msg->msg.errno) {
379 if (gss_msg->ctx == NULL)
381 clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
382 gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx);
385 set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
387 gss_cred->gc_upcall_timestamp = jiffies;
388 gss_cred->gc_upcall = NULL;
389 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
393 gss_upcall_callback(struct rpc_task *task)
395 struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred,
396 struct gss_cred, gc_base);
397 struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
398 struct rpc_pipe *pipe = gss_msg->pipe;
400 spin_lock(&pipe->lock);
401 gss_handle_downcall_result(gss_cred, gss_msg);
402 spin_unlock(&pipe->lock);
403 task->tk_status = gss_msg->msg.errno;
404 gss_release_msg(gss_msg);
407 static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg)
409 uid_t uid = from_kuid(&init_user_ns, gss_msg->uid);
410 memcpy(gss_msg->databuf, &uid, sizeof(uid));
411 gss_msg->msg.data = gss_msg->databuf;
412 gss_msg->msg.len = sizeof(uid);
414 BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf));
417 static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
418 const char *service_name,
419 const char *target_name)
421 struct gss_api_mech *mech = gss_msg->auth->mech;
422 char *p = gss_msg->databuf;
423 size_t buflen = sizeof(gss_msg->databuf);
426 len = scnprintf(p, buflen, "mech=%s uid=%d ", mech->gm_name,
427 from_kuid(&init_user_ns, gss_msg->uid));
430 gss_msg->msg.len = len;
432 len = scnprintf(p, buflen, "target=%s ", target_name);
435 gss_msg->msg.len += len;
437 if (service_name != NULL) {
438 len = scnprintf(p, buflen, "service=%s ", service_name);
441 gss_msg->msg.len += len;
443 if (mech->gm_upcall_enctypes) {
444 len = scnprintf(p, buflen, "enctypes=%s ",
445 mech->gm_upcall_enctypes);
448 gss_msg->msg.len += len;
450 len = scnprintf(p, buflen, "\n");
453 gss_msg->msg.len += len;
455 gss_msg->msg.data = gss_msg->databuf;
462 static struct gss_upcall_msg *
463 gss_alloc_msg(struct gss_auth *gss_auth,
464 kuid_t uid, const char *service_name)
466 struct gss_upcall_msg *gss_msg;
470 gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS);
473 vers = get_pipe_version(gss_auth->net);
477 gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe;
478 INIT_LIST_HEAD(&gss_msg->list);
479 rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
480 init_waitqueue_head(&gss_msg->waitqueue);
481 atomic_set(&gss_msg->count, 1);
483 gss_msg->auth = gss_auth;
486 gss_encode_v0_msg(gss_msg);
489 err = gss_encode_v1_msg(gss_msg, service_name, gss_auth->target_name);
491 goto err_put_pipe_version;
493 kref_get(&gss_auth->kref);
495 err_put_pipe_version:
496 put_pipe_version(gss_auth->net);
503 static struct gss_upcall_msg *
504 gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred)
506 struct gss_cred *gss_cred = container_of(cred,
507 struct gss_cred, gc_base);
508 struct gss_upcall_msg *gss_new, *gss_msg;
509 kuid_t uid = cred->cr_uid;
511 gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal);
514 gss_msg = gss_add_msg(gss_new);
515 if (gss_msg == gss_new) {
517 atomic_inc(&gss_msg->count);
518 res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg);
520 gss_unhash_msg(gss_new);
521 atomic_dec(&gss_msg->count);
522 gss_release_msg(gss_new);
523 gss_msg = ERR_PTR(res);
526 gss_release_msg(gss_new);
530 static void warn_gssd(void)
532 dprintk("AUTH_GSS upcall failed. Please check user daemon is running.\n");
536 gss_refresh_upcall(struct rpc_task *task)
538 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
539 struct gss_auth *gss_auth = container_of(cred->cr_auth,
540 struct gss_auth, rpc_auth);
541 struct gss_cred *gss_cred = container_of(cred,
542 struct gss_cred, gc_base);
543 struct gss_upcall_msg *gss_msg;
544 struct rpc_pipe *pipe;
547 dprintk("RPC: %5u %s for uid %u\n",
548 task->tk_pid, __func__, from_kuid(&init_user_ns, cred->cr_uid));
549 gss_msg = gss_setup_upcall(gss_auth, cred);
550 if (PTR_ERR(gss_msg) == -EAGAIN) {
551 /* XXX: warning on the first, under the assumption we
552 * shouldn't normally hit this case on a refresh. */
554 task->tk_timeout = 15*HZ;
555 rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL);
558 if (IS_ERR(gss_msg)) {
559 err = PTR_ERR(gss_msg);
562 pipe = gss_msg->pipe;
563 spin_lock(&pipe->lock);
564 if (gss_cred->gc_upcall != NULL)
565 rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
566 else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
567 task->tk_timeout = 0;
568 gss_cred->gc_upcall = gss_msg;
569 /* gss_upcall_callback will release the reference to gss_upcall_msg */
570 atomic_inc(&gss_msg->count);
571 rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback);
573 gss_handle_downcall_result(gss_cred, gss_msg);
574 err = gss_msg->msg.errno;
576 spin_unlock(&pipe->lock);
577 gss_release_msg(gss_msg);
579 dprintk("RPC: %5u %s for uid %u result %d\n",
580 task->tk_pid, __func__,
581 from_kuid(&init_user_ns, cred->cr_uid), err);
586 gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
588 struct net *net = gss_auth->net;
589 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
590 struct rpc_pipe *pipe;
591 struct rpc_cred *cred = &gss_cred->gc_base;
592 struct gss_upcall_msg *gss_msg;
596 dprintk("RPC: %s for uid %u\n",
597 __func__, from_kuid(&init_user_ns, cred->cr_uid));
600 /* if gssd is down, just skip upcalling altogether */
601 if (!gssd_running(net)) {
605 gss_msg = gss_setup_upcall(gss_auth, cred);
606 if (PTR_ERR(gss_msg) == -EAGAIN) {
607 err = wait_event_interruptible_timeout(pipe_version_waitqueue,
608 sn->pipe_version >= 0, 15 * HZ);
609 if (sn->pipe_version < 0) {
617 if (IS_ERR(gss_msg)) {
618 err = PTR_ERR(gss_msg);
621 pipe = gss_msg->pipe;
623 prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE);
624 spin_lock(&pipe->lock);
625 if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
628 spin_unlock(&pipe->lock);
629 if (fatal_signal_pending(current)) {
636 gss_cred_set_ctx(cred, gss_msg->ctx);
638 err = gss_msg->msg.errno;
639 spin_unlock(&pipe->lock);
641 finish_wait(&gss_msg->waitqueue, &wait);
642 gss_release_msg(gss_msg);
644 dprintk("RPC: %s for uid %u result %d\n",
645 __func__, from_kuid(&init_user_ns, cred->cr_uid), err);
649 #define MSG_BUF_MAXSIZE 1024
652 gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
656 struct gss_upcall_msg *gss_msg;
657 struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe;
658 struct gss_cl_ctx *ctx;
661 ssize_t err = -EFBIG;
663 if (mlen > MSG_BUF_MAXSIZE)
666 buf = kmalloc(mlen, GFP_NOFS);
671 if (copy_from_user(buf, src, mlen))
674 end = (const void *)((char *)buf + mlen);
675 p = simple_get_bytes(buf, end, &id, sizeof(id));
681 uid = make_kuid(&init_user_ns, id);
682 if (!uid_valid(uid)) {
688 ctx = gss_alloc_context();
693 /* Find a matching upcall */
694 spin_lock(&pipe->lock);
695 gss_msg = __gss_find_upcall(pipe, uid, NULL);
696 if (gss_msg == NULL) {
697 spin_unlock(&pipe->lock);
700 list_del_init(&gss_msg->list);
701 spin_unlock(&pipe->lock);
703 p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
709 gss_msg->msg.errno = err;
716 gss_msg->msg.errno = -EAGAIN;
719 printk(KERN_CRIT "%s: bad return from "
720 "gss_fill_context: %zd\n", __func__, err);
721 gss_msg->msg.errno = -EIO;
723 goto err_release_msg;
725 gss_msg->ctx = gss_get_ctx(ctx);
729 spin_lock(&pipe->lock);
730 __gss_unhash_msg(gss_msg);
731 spin_unlock(&pipe->lock);
732 gss_release_msg(gss_msg);
738 dprintk("RPC: %s returning %Zd\n", __func__, err);
742 static int gss_pipe_open(struct inode *inode, int new_version)
744 struct net *net = inode->i_sb->s_fs_info;
745 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
748 spin_lock(&pipe_version_lock);
749 if (sn->pipe_version < 0) {
750 /* First open of any gss pipe determines the version: */
751 sn->pipe_version = new_version;
752 rpc_wake_up(&pipe_version_rpc_waitqueue);
753 wake_up(&pipe_version_waitqueue);
754 } else if (sn->pipe_version != new_version) {
755 /* Trying to open a pipe of a different version */
759 atomic_inc(&sn->pipe_users);
761 spin_unlock(&pipe_version_lock);
766 static int gss_pipe_open_v0(struct inode *inode)
768 return gss_pipe_open(inode, 0);
771 static int gss_pipe_open_v1(struct inode *inode)
773 return gss_pipe_open(inode, 1);
777 gss_pipe_release(struct inode *inode)
779 struct net *net = inode->i_sb->s_fs_info;
780 struct rpc_pipe *pipe = RPC_I(inode)->pipe;
781 struct gss_upcall_msg *gss_msg;
784 spin_lock(&pipe->lock);
785 list_for_each_entry(gss_msg, &pipe->in_downcall, list) {
787 if (!list_empty(&gss_msg->msg.list))
789 gss_msg->msg.errno = -EPIPE;
790 atomic_inc(&gss_msg->count);
791 __gss_unhash_msg(gss_msg);
792 spin_unlock(&pipe->lock);
793 gss_release_msg(gss_msg);
796 spin_unlock(&pipe->lock);
798 put_pipe_version(net);
802 gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
804 struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
806 if (msg->errno < 0) {
807 dprintk("RPC: %s releasing msg %p\n",
809 atomic_inc(&gss_msg->count);
810 gss_unhash_msg(gss_msg);
811 if (msg->errno == -ETIMEDOUT)
813 gss_release_msg(gss_msg);
815 gss_release_msg(gss_msg);
818 static void gss_pipe_dentry_destroy(struct dentry *dir,
819 struct rpc_pipe_dir_object *pdo)
821 struct gss_pipe *gss_pipe = pdo->pdo_data;
822 struct rpc_pipe *pipe = gss_pipe->pipe;
824 if (pipe->dentry != NULL) {
825 rpc_unlink(pipe->dentry);
830 static int gss_pipe_dentry_create(struct dentry *dir,
831 struct rpc_pipe_dir_object *pdo)
833 struct gss_pipe *p = pdo->pdo_data;
834 struct dentry *dentry;
836 dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe);
838 return PTR_ERR(dentry);
839 p->pipe->dentry = dentry;
843 static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = {
844 .create = gss_pipe_dentry_create,
845 .destroy = gss_pipe_dentry_destroy,
848 static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt,
850 const struct rpc_pipe_ops *upcall_ops)
855 p = kmalloc(sizeof(*p), GFP_KERNEL);
858 p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
859 if (IS_ERR(p->pipe)) {
860 err = PTR_ERR(p->pipe);
861 goto err_free_gss_pipe;
866 rpc_init_pipe_dir_object(&p->pdo,
867 &gss_pipe_dir_object_ops,
876 struct gss_alloc_pdo {
877 struct rpc_clnt *clnt;
879 const struct rpc_pipe_ops *upcall_ops;
882 static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data)
884 struct gss_pipe *gss_pipe;
885 struct gss_alloc_pdo *args = data;
887 if (pdo->pdo_ops != &gss_pipe_dir_object_ops)
889 gss_pipe = container_of(pdo, struct gss_pipe, pdo);
890 if (strcmp(gss_pipe->name, args->name) != 0)
892 if (!kref_get_unless_zero(&gss_pipe->kref))
897 static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data)
899 struct gss_pipe *gss_pipe;
900 struct gss_alloc_pdo *args = data;
902 gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops);
903 if (!IS_ERR(gss_pipe))
904 return &gss_pipe->pdo;
908 static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt,
910 const struct rpc_pipe_ops *upcall_ops)
912 struct net *net = rpc_net_ns(clnt);
913 struct rpc_pipe_dir_object *pdo;
914 struct gss_alloc_pdo args = {
917 .upcall_ops = upcall_ops,
920 pdo = rpc_find_or_alloc_pipe_dir_object(net,
921 &clnt->cl_pipedir_objects,
926 return container_of(pdo, struct gss_pipe, pdo);
927 return ERR_PTR(-ENOMEM);
930 static void __gss_pipe_free(struct gss_pipe *p)
932 struct rpc_clnt *clnt = p->clnt;
933 struct net *net = rpc_net_ns(clnt);
935 rpc_remove_pipe_dir_object(net,
936 &clnt->cl_pipedir_objects,
938 rpc_destroy_pipe_data(p->pipe);
942 static void __gss_pipe_release(struct kref *kref)
944 struct gss_pipe *p = container_of(kref, struct gss_pipe, kref);
949 static void gss_pipe_free(struct gss_pipe *p)
952 kref_put(&p->kref, __gss_pipe_release);
956 * NOTE: we have the opportunity to use different
957 * parameters based on the input flavor (which must be a pseudoflavor)
959 static struct gss_auth *
960 gss_create_new(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
962 rpc_authflavor_t flavor = args->pseudoflavor;
963 struct gss_auth *gss_auth;
964 struct gss_pipe *gss_pipe;
965 struct rpc_auth * auth;
966 int err = -ENOMEM; /* XXX? */
968 dprintk("RPC: creating GSS authenticator for client %p\n", clnt);
970 if (!try_module_get(THIS_MODULE))
972 if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
974 INIT_HLIST_NODE(&gss_auth->hash);
975 gss_auth->target_name = NULL;
976 if (args->target_name) {
977 gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL);
978 if (gss_auth->target_name == NULL)
981 gss_auth->client = clnt;
982 gss_auth->net = get_net(rpc_net_ns(clnt));
984 gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
985 if (!gss_auth->mech) {
986 dprintk("RPC: Pseudoflavor %d not found!\n", flavor);
989 gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
990 if (gss_auth->service == 0)
992 if (!gssd_running(gss_auth->net))
994 auth = &gss_auth->rpc_auth;
995 auth->au_cslack = GSS_CRED_SLACK >> 2;
996 auth->au_rslack = GSS_VERF_SLACK >> 2;
998 auth->au_ops = &authgss_ops;
999 auth->au_flavor = flavor;
1000 if (gss_pseudoflavor_to_datatouch(gss_auth->mech, flavor))
1001 auth->au_flags |= RPCAUTH_AUTH_DATATOUCH;
1002 atomic_set(&auth->au_count, 1);
1003 kref_init(&gss_auth->kref);
1005 err = rpcauth_init_credcache(auth);
1009 * Note: if we created the old pipe first, then someone who
1010 * examined the directory at the right moment might conclude
1011 * that we supported only the old pipe. So we instead create
1012 * the new pipe first.
1014 gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1);
1015 if (IS_ERR(gss_pipe)) {
1016 err = PTR_ERR(gss_pipe);
1017 goto err_destroy_credcache;
1019 gss_auth->gss_pipe[1] = gss_pipe;
1021 gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name,
1022 &gss_upcall_ops_v0);
1023 if (IS_ERR(gss_pipe)) {
1024 err = PTR_ERR(gss_pipe);
1025 goto err_destroy_pipe_1;
1027 gss_auth->gss_pipe[0] = gss_pipe;
1031 gss_pipe_free(gss_auth->gss_pipe[1]);
1032 err_destroy_credcache:
1033 rpcauth_destroy_credcache(auth);
1035 gss_mech_put(gss_auth->mech);
1037 put_net(gss_auth->net);
1039 kfree(gss_auth->target_name);
1042 module_put(THIS_MODULE);
1043 return ERR_PTR(err);
1047 gss_free(struct gss_auth *gss_auth)
1049 gss_pipe_free(gss_auth->gss_pipe[0]);
1050 gss_pipe_free(gss_auth->gss_pipe[1]);
1051 gss_mech_put(gss_auth->mech);
1052 put_net(gss_auth->net);
1053 kfree(gss_auth->target_name);
1056 module_put(THIS_MODULE);
1060 gss_free_callback(struct kref *kref)
1062 struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref);
1068 gss_put_auth(struct gss_auth *gss_auth)
1070 kref_put(&gss_auth->kref, gss_free_callback);
1074 gss_destroy(struct rpc_auth *auth)
1076 struct gss_auth *gss_auth = container_of(auth,
1077 struct gss_auth, rpc_auth);
1079 dprintk("RPC: destroying GSS authenticator %p flavor %d\n",
1080 auth, auth->au_flavor);
1082 if (hash_hashed(&gss_auth->hash)) {
1083 spin_lock(&gss_auth_hash_lock);
1084 hash_del(&gss_auth->hash);
1085 spin_unlock(&gss_auth_hash_lock);
1088 gss_pipe_free(gss_auth->gss_pipe[0]);
1089 gss_auth->gss_pipe[0] = NULL;
1090 gss_pipe_free(gss_auth->gss_pipe[1]);
1091 gss_auth->gss_pipe[1] = NULL;
1092 rpcauth_destroy_credcache(auth);
1094 gss_put_auth(gss_auth);
1098 * Auths may be shared between rpc clients that were cloned from a
1099 * common client with the same xprt, if they also share the flavor and
1102 * The auth is looked up from the oldest parent sharing the same
1103 * cl_xprt, and the auth itself references only that common parent
1104 * (which is guaranteed to last as long as any of its descendants).
1106 static struct gss_auth *
1107 gss_auth_find_or_add_hashed(struct rpc_auth_create_args *args,
1108 struct rpc_clnt *clnt,
1109 struct gss_auth *new)
1111 struct gss_auth *gss_auth;
1112 unsigned long hashval = (unsigned long)clnt;
1114 spin_lock(&gss_auth_hash_lock);
1115 hash_for_each_possible(gss_auth_hash_table,
1119 if (gss_auth->client != clnt)
1121 if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor)
1123 if (gss_auth->target_name != args->target_name) {
1124 if (gss_auth->target_name == NULL)
1126 if (args->target_name == NULL)
1128 if (strcmp(gss_auth->target_name, args->target_name))
1131 if (!atomic_inc_not_zero(&gss_auth->rpc_auth.au_count))
1136 hash_add(gss_auth_hash_table, &new->hash, hashval);
1139 spin_unlock(&gss_auth_hash_lock);
1143 static struct gss_auth *
1144 gss_create_hashed(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
1146 struct gss_auth *gss_auth;
1147 struct gss_auth *new;
1149 gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL);
1150 if (gss_auth != NULL)
1152 new = gss_create_new(args, clnt);
1155 gss_auth = gss_auth_find_or_add_hashed(args, clnt, new);
1156 if (gss_auth != new)
1157 gss_destroy(&new->rpc_auth);
1162 static struct rpc_auth *
1163 gss_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
1165 struct gss_auth *gss_auth;
1166 struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch);
1168 while (clnt != clnt->cl_parent) {
1169 struct rpc_clnt *parent = clnt->cl_parent;
1170 /* Find the original parent for this transport */
1171 if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps)
1176 gss_auth = gss_create_hashed(args, clnt);
1177 if (IS_ERR(gss_auth))
1178 return ERR_CAST(gss_auth);
1179 return &gss_auth->rpc_auth;
1183 * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call
1184 * to the server with the GSS control procedure field set to
1185 * RPC_GSS_PROC_DESTROY. This should normally cause the server to release
1186 * all RPCSEC_GSS state associated with that context.
1189 gss_destroying_context(struct rpc_cred *cred)
1191 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1192 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
1193 struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1);
1194 struct rpc_task *task;
1196 if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
1199 ctx->gc_proc = RPC_GSS_PROC_DESTROY;
1200 cred->cr_ops = &gss_nullops;
1202 /* Take a reference to ensure the cred will be destroyed either
1203 * by the RPC call or by the put_rpccred() below */
1206 task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT);
1214 /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure
1215 * to create a new cred or context, so they check that things have been
1216 * allocated before freeing them. */
1218 gss_do_free_ctx(struct gss_cl_ctx *ctx)
1220 dprintk("RPC: %s\n", __func__);
1222 gss_delete_sec_context(&ctx->gc_gss_ctx);
1223 kfree(ctx->gc_wire_ctx.data);
1224 kfree(ctx->gc_acceptor.data);
1229 gss_free_ctx_callback(struct rcu_head *head)
1231 struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu);
1232 gss_do_free_ctx(ctx);
1236 gss_free_ctx(struct gss_cl_ctx *ctx)
1238 call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
1242 gss_free_cred(struct gss_cred *gss_cred)
1244 dprintk("RPC: %s cred=%p\n", __func__, gss_cred);
1249 gss_free_cred_callback(struct rcu_head *head)
1251 struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu);
1252 gss_free_cred(gss_cred);
1256 gss_destroy_nullcred(struct rpc_cred *cred)
1258 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1259 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
1260 struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1);
1262 RCU_INIT_POINTER(gss_cred->gc_ctx, NULL);
1263 call_rcu(&cred->cr_rcu, gss_free_cred_callback);
1266 gss_put_auth(gss_auth);
1270 gss_destroy_cred(struct rpc_cred *cred)
1273 if (gss_destroying_context(cred))
1275 gss_destroy_nullcred(cred);
1279 gss_hash_cred(struct auth_cred *acred, unsigned int hashbits)
1281 return hash_64(from_kuid(&init_user_ns, acred->uid), hashbits);
1285 * Lookup RPCSEC_GSS cred for the current process
1287 static struct rpc_cred *
1288 gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
1290 return rpcauth_lookup_credcache(auth, acred, flags, GFP_NOFS);
1293 static struct rpc_cred *
1294 gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags, gfp_t gfp)
1296 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
1297 struct gss_cred *cred = NULL;
1300 dprintk("RPC: %s for uid %d, flavor %d\n",
1301 __func__, from_kuid(&init_user_ns, acred->uid),
1304 if (!(cred = kzalloc(sizeof(*cred), gfp)))
1307 rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops);
1309 * Note: in order to force a call to call_refresh(), we deliberately
1310 * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
1312 cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
1313 cred->gc_service = gss_auth->service;
1314 cred->gc_principal = NULL;
1315 if (acred->machine_cred)
1316 cred->gc_principal = acred->principal;
1317 kref_get(&gss_auth->kref);
1318 return &cred->gc_base;
1321 dprintk("RPC: %s failed with error %d\n", __func__, err);
1322 return ERR_PTR(err);
1326 gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred)
1328 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
1329 struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base);
1333 err = gss_create_upcall(gss_auth, gss_cred);
1334 } while (err == -EAGAIN);
1339 gss_stringify_acceptor(struct rpc_cred *cred)
1341 char *string = NULL;
1342 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1343 struct gss_cl_ctx *ctx;
1345 struct xdr_netobj *acceptor;
1348 ctx = rcu_dereference(gss_cred->gc_ctx);
1352 len = ctx->gc_acceptor.len;
1355 /* no point if there's no string */
1359 string = kmalloc(len + 1, GFP_KERNEL);
1364 ctx = rcu_dereference(gss_cred->gc_ctx);
1366 /* did the ctx disappear or was it replaced by one with no acceptor? */
1367 if (!ctx || !ctx->gc_acceptor.len) {
1373 acceptor = &ctx->gc_acceptor;
1376 * Did we find a new acceptor that's longer than the original? Allocate
1377 * a longer buffer and try again.
1379 if (len < acceptor->len) {
1380 len = acceptor->len;
1386 memcpy(string, acceptor->data, acceptor->len);
1387 string[acceptor->len] = '\0';
1394 * Returns -EACCES if GSS context is NULL or will expire within the
1395 * timeout (miliseconds)
1398 gss_key_timeout(struct rpc_cred *rc)
1400 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
1401 struct gss_cl_ctx *ctx;
1402 unsigned long timeout = jiffies + (gss_key_expire_timeo * HZ);
1406 ctx = rcu_dereference(gss_cred->gc_ctx);
1407 if (!ctx || time_after(timeout, ctx->gc_expiry))
1415 gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
1417 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
1418 struct gss_cl_ctx *ctx;
1421 if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
1423 /* Don't match with creds that have expired. */
1425 ctx = rcu_dereference(gss_cred->gc_ctx);
1426 if (!ctx || time_after(jiffies, ctx->gc_expiry)) {
1431 if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
1434 if (acred->principal != NULL) {
1435 if (gss_cred->gc_principal == NULL)
1437 ret = strcmp(acred->principal, gss_cred->gc_principal) == 0;
1440 if (gss_cred->gc_principal != NULL)
1442 ret = uid_eq(rc->cr_uid, acred->uid);
1448 /* Notify acred users of GSS context expiration timeout */
1449 if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags) &&
1450 (gss_key_timeout(rc) != 0)) {
1451 /* test will now be done from generic cred */
1452 test_and_clear_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags);
1453 /* tell NFS layer that key will expire soon */
1454 set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags);
1460 * Marshal credentials.
1461 * Maybe we should keep a cached credential for performance reasons.
1464 gss_marshal(struct rpc_task *task, __be32 *p)
1466 struct rpc_rqst *req = task->tk_rqstp;
1467 struct rpc_cred *cred = req->rq_cred;
1468 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1470 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1473 struct xdr_netobj mic;
1475 struct xdr_buf verf_buf;
1477 dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1479 *p++ = htonl(RPC_AUTH_GSS);
1482 spin_lock(&ctx->gc_seq_lock);
1483 req->rq_seqno = ctx->gc_seq++;
1484 spin_unlock(&ctx->gc_seq_lock);
1486 *p++ = htonl((u32) RPC_GSS_VERSION);
1487 *p++ = htonl((u32) ctx->gc_proc);
1488 *p++ = htonl((u32) req->rq_seqno);
1489 *p++ = htonl((u32) gss_cred->gc_service);
1490 p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
1491 *cred_len = htonl((p - (cred_len + 1)) << 2);
1493 /* We compute the checksum for the verifier over the xdr-encoded bytes
1494 * starting with the xid and ending at the end of the credential: */
1495 iov.iov_base = xprt_skip_transport_header(req->rq_xprt,
1496 req->rq_snd_buf.head[0].iov_base);
1497 iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
1498 xdr_buf_from_iov(&iov, &verf_buf);
1500 /* set verifier flavor*/
1501 *p++ = htonl(RPC_AUTH_GSS);
1503 mic.data = (u8 *)(p + 1);
1504 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1505 if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
1506 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1507 } else if (maj_stat != 0) {
1508 printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
1511 p = xdr_encode_opaque(p, NULL, mic.len);
1519 static int gss_renew_cred(struct rpc_task *task)
1521 struct rpc_cred *oldcred = task->tk_rqstp->rq_cred;
1522 struct gss_cred *gss_cred = container_of(oldcred,
1525 struct rpc_auth *auth = oldcred->cr_auth;
1526 struct auth_cred acred = {
1527 .uid = oldcred->cr_uid,
1528 .principal = gss_cred->gc_principal,
1529 .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0),
1531 struct rpc_cred *new;
1533 new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
1535 return PTR_ERR(new);
1536 task->tk_rqstp->rq_cred = new;
1537 put_rpccred(oldcred);
1541 static int gss_cred_is_negative_entry(struct rpc_cred *cred)
1543 if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) {
1544 unsigned long now = jiffies;
1545 unsigned long begin, expire;
1546 struct gss_cred *gss_cred;
1548 gss_cred = container_of(cred, struct gss_cred, gc_base);
1549 begin = gss_cred->gc_upcall_timestamp;
1550 expire = begin + gss_expired_cred_retry_delay * HZ;
1552 if (time_in_range_open(now, begin, expire))
1559 * Refresh credentials. XXX - finish
1562 gss_refresh(struct rpc_task *task)
1564 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1567 if (gss_cred_is_negative_entry(cred))
1568 return -EKEYEXPIRED;
1570 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
1571 !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) {
1572 ret = gss_renew_cred(task);
1575 cred = task->tk_rqstp->rq_cred;
1578 if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
1579 ret = gss_refresh_upcall(task);
1584 /* Dummy refresh routine: used only when destroying the context */
1586 gss_refresh_null(struct rpc_task *task)
1592 gss_validate(struct rpc_task *task, __be32 *p)
1594 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1595 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1598 struct xdr_buf verf_buf;
1599 struct xdr_netobj mic;
1602 __be32 *ret = ERR_PTR(-EIO);
1604 dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1607 if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
1609 if (flav != RPC_AUTH_GSS)
1611 seq = kmalloc(4, GFP_NOFS);
1614 *seq = htonl(task->tk_rqstp->rq_seqno);
1617 xdr_buf_from_iov(&iov, &verf_buf);
1621 ret = ERR_PTR(-EACCES);
1622 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1623 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1624 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1626 dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n",
1627 task->tk_pid, __func__, maj_stat);
1630 /* We leave it to unwrap to calculate au_rslack. For now we just
1631 * calculate the length of the verifier: */
1632 cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
1634 dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n",
1635 task->tk_pid, __func__);
1637 return p + XDR_QUADLEN(len);
1640 dprintk("RPC: %5u %s failed ret %ld.\n", task->tk_pid, __func__,
1646 static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp,
1647 __be32 *p, void *obj)
1649 struct xdr_stream xdr;
1651 xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p);
1652 encode(rqstp, &xdr, obj);
1656 gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1657 kxdreproc_t encode, struct rpc_rqst *rqstp,
1658 __be32 *p, void *obj)
1660 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1661 struct xdr_buf integ_buf;
1662 __be32 *integ_len = NULL;
1663 struct xdr_netobj mic;
1671 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1672 *p++ = htonl(rqstp->rq_seqno);
1674 gss_wrap_req_encode(encode, rqstp, p, obj);
1676 if (xdr_buf_subsegment(snd_buf, &integ_buf,
1677 offset, snd_buf->len - offset))
1679 *integ_len = htonl(integ_buf.len);
1681 /* guess whether we're in the head or the tail: */
1682 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1683 iov = snd_buf->tail;
1685 iov = snd_buf->head;
1686 p = iov->iov_base + iov->iov_len;
1687 mic.data = (u8 *)(p + 1);
1689 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1690 status = -EIO; /* XXX? */
1691 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1692 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1695 q = xdr_encode_opaque(p, NULL, mic.len);
1697 offset = (u8 *)q - (u8 *)p;
1698 iov->iov_len += offset;
1699 snd_buf->len += offset;
1704 priv_release_snd_buf(struct rpc_rqst *rqstp)
1708 for (i=0; i < rqstp->rq_enc_pages_num; i++)
1709 __free_page(rqstp->rq_enc_pages[i]);
1710 kfree(rqstp->rq_enc_pages);
1711 rqstp->rq_release_snd_buf = NULL;
1715 alloc_enc_pages(struct rpc_rqst *rqstp)
1717 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1720 if (rqstp->rq_release_snd_buf)
1721 rqstp->rq_release_snd_buf(rqstp);
1723 if (snd_buf->page_len == 0) {
1724 rqstp->rq_enc_pages_num = 0;
1728 first = snd_buf->page_base >> PAGE_SHIFT;
1729 last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_SHIFT;
1730 rqstp->rq_enc_pages_num = last - first + 1 + 1;
1732 = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *),
1734 if (!rqstp->rq_enc_pages)
1736 for (i=0; i < rqstp->rq_enc_pages_num; i++) {
1737 rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS);
1738 if (rqstp->rq_enc_pages[i] == NULL)
1741 rqstp->rq_release_snd_buf = priv_release_snd_buf;
1744 rqstp->rq_enc_pages_num = i;
1745 priv_release_snd_buf(rqstp);
1751 gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1752 kxdreproc_t encode, struct rpc_rqst *rqstp,
1753 __be32 *p, void *obj)
1755 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1760 struct page **inpages;
1767 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1768 *p++ = htonl(rqstp->rq_seqno);
1770 gss_wrap_req_encode(encode, rqstp, p, obj);
1772 status = alloc_enc_pages(rqstp);
1775 first = snd_buf->page_base >> PAGE_SHIFT;
1776 inpages = snd_buf->pages + first;
1777 snd_buf->pages = rqstp->rq_enc_pages;
1778 snd_buf->page_base -= first << PAGE_SHIFT;
1780 * Give the tail its own page, in case we need extra space in the
1781 * head when wrapping:
1783 * call_allocate() allocates twice the slack space required
1784 * by the authentication flavor to rq_callsize.
1785 * For GSS, slack is GSS_CRED_SLACK.
1787 if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
1788 tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]);
1789 memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len);
1790 snd_buf->tail[0].iov_base = tmp;
1792 maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
1793 /* slack space should prevent this ever happening: */
1794 BUG_ON(snd_buf->len > snd_buf->buflen);
1796 /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was
1797 * done anyway, so it's safe to put the request on the wire: */
1798 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1799 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1803 *opaque_len = htonl(snd_buf->len - offset);
1804 /* guess whether we're in the head or the tail: */
1805 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1806 iov = snd_buf->tail;
1808 iov = snd_buf->head;
1809 p = iov->iov_base + iov->iov_len;
1810 pad = 3 - ((snd_buf->len - offset - 1) & 3);
1812 iov->iov_len += pad;
1813 snd_buf->len += pad;
1819 gss_wrap_req(struct rpc_task *task,
1820 kxdreproc_t encode, void *rqstp, __be32 *p, void *obj)
1822 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1823 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1825 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1828 dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1829 if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
1830 /* The spec seems a little ambiguous here, but I think that not
1831 * wrapping context destruction requests makes the most sense.
1833 gss_wrap_req_encode(encode, rqstp, p, obj);
1837 switch (gss_cred->gc_service) {
1838 case RPC_GSS_SVC_NONE:
1839 gss_wrap_req_encode(encode, rqstp, p, obj);
1842 case RPC_GSS_SVC_INTEGRITY:
1843 status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj);
1845 case RPC_GSS_SVC_PRIVACY:
1846 status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj);
1851 dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status);
1856 gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1857 struct rpc_rqst *rqstp, __be32 **p)
1859 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1860 struct xdr_buf integ_buf;
1861 struct xdr_netobj mic;
1862 u32 data_offset, mic_offset;
1867 integ_len = ntohl(*(*p)++);
1870 data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1871 mic_offset = integ_len + data_offset;
1872 if (mic_offset > rcv_buf->len)
1874 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1877 if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset,
1878 mic_offset - data_offset))
1881 if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset))
1884 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1885 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1886 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1887 if (maj_stat != GSS_S_COMPLETE)
1893 gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1894 struct rpc_rqst *rqstp, __be32 **p)
1896 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1902 opaque_len = ntohl(*(*p)++);
1903 offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1904 if (offset + opaque_len > rcv_buf->len)
1906 /* remove padding: */
1907 rcv_buf->len = offset + opaque_len;
1909 maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
1910 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1911 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1912 if (maj_stat != GSS_S_COMPLETE)
1914 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1921 gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp,
1922 __be32 *p, void *obj)
1924 struct xdr_stream xdr;
1926 xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
1927 return decode(rqstp, &xdr, obj);
1931 gss_unwrap_resp(struct rpc_task *task,
1932 kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj)
1934 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1935 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1937 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1939 struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head;
1940 int savedlen = head->iov_len;
1943 if (ctx->gc_proc != RPC_GSS_PROC_DATA)
1945 switch (gss_cred->gc_service) {
1946 case RPC_GSS_SVC_NONE:
1948 case RPC_GSS_SVC_INTEGRITY:
1949 status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p);
1953 case RPC_GSS_SVC_PRIVACY:
1954 status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p);
1959 /* take into account extra slack for integrity and privacy cases: */
1960 cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp)
1961 + (savedlen - head->iov_len);
1963 status = gss_unwrap_req_decode(decode, rqstp, p, obj);
1966 dprintk("RPC: %5u %s returning %d\n",
1967 task->tk_pid, __func__, status);
1971 static const struct rpc_authops authgss_ops = {
1972 .owner = THIS_MODULE,
1973 .au_flavor = RPC_AUTH_GSS,
1974 .au_name = "RPCSEC_GSS",
1975 .create = gss_create,
1976 .destroy = gss_destroy,
1977 .hash_cred = gss_hash_cred,
1978 .lookup_cred = gss_lookup_cred,
1979 .crcreate = gss_create_cred,
1980 .list_pseudoflavors = gss_mech_list_pseudoflavors,
1981 .info2flavor = gss_mech_info2flavor,
1982 .flavor2info = gss_mech_flavor2info,
1985 static const struct rpc_credops gss_credops = {
1986 .cr_name = "AUTH_GSS",
1987 .crdestroy = gss_destroy_cred,
1988 .cr_init = gss_cred_init,
1989 .crbind = rpcauth_generic_bind_cred,
1990 .crmatch = gss_match,
1991 .crmarshal = gss_marshal,
1992 .crrefresh = gss_refresh,
1993 .crvalidate = gss_validate,
1994 .crwrap_req = gss_wrap_req,
1995 .crunwrap_resp = gss_unwrap_resp,
1996 .crkey_timeout = gss_key_timeout,
1997 .crstringify_acceptor = gss_stringify_acceptor,
2000 static const struct rpc_credops gss_nullops = {
2001 .cr_name = "AUTH_GSS",
2002 .crdestroy = gss_destroy_nullcred,
2003 .crbind = rpcauth_generic_bind_cred,
2004 .crmatch = gss_match,
2005 .crmarshal = gss_marshal,
2006 .crrefresh = gss_refresh_null,
2007 .crvalidate = gss_validate,
2008 .crwrap_req = gss_wrap_req,
2009 .crunwrap_resp = gss_unwrap_resp,
2010 .crstringify_acceptor = gss_stringify_acceptor,
2013 static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
2014 .upcall = rpc_pipe_generic_upcall,
2015 .downcall = gss_pipe_downcall,
2016 .destroy_msg = gss_pipe_destroy_msg,
2017 .open_pipe = gss_pipe_open_v0,
2018 .release_pipe = gss_pipe_release,
2021 static const struct rpc_pipe_ops gss_upcall_ops_v1 = {
2022 .upcall = rpc_pipe_generic_upcall,
2023 .downcall = gss_pipe_downcall,
2024 .destroy_msg = gss_pipe_destroy_msg,
2025 .open_pipe = gss_pipe_open_v1,
2026 .release_pipe = gss_pipe_release,
2029 static __net_init int rpcsec_gss_init_net(struct net *net)
2031 return gss_svc_init_net(net);
2034 static __net_exit void rpcsec_gss_exit_net(struct net *net)
2036 gss_svc_shutdown_net(net);
2039 static struct pernet_operations rpcsec_gss_net_ops = {
2040 .init = rpcsec_gss_init_net,
2041 .exit = rpcsec_gss_exit_net,
2045 * Initialize RPCSEC_GSS module
2047 static int __init init_rpcsec_gss(void)
2051 err = rpcauth_register(&authgss_ops);
2054 err = gss_svc_init();
2056 goto out_unregister;
2057 err = register_pernet_subsys(&rpcsec_gss_net_ops);
2060 rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version");
2065 rpcauth_unregister(&authgss_ops);
2070 static void __exit exit_rpcsec_gss(void)
2072 unregister_pernet_subsys(&rpcsec_gss_net_ops);
2074 rpcauth_unregister(&authgss_ops);
2075 rcu_barrier(); /* Wait for completion of call_rcu()'s */
2078 MODULE_ALIAS("rpc-auth-6");
2079 MODULE_LICENSE("GPL");
2080 module_param_named(expired_cred_retry_delay,
2081 gss_expired_cred_retry_delay,
2083 MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until "
2084 "the RPC engine retries an expired credential");
2086 module_param_named(key_expire_timeo,
2087 gss_key_expire_timeo,
2089 MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a "
2090 "credential keys lifetime where the NFS layer cleans up "
2091 "prior to key expiration");
2093 module_init(init_rpcsec_gss)
2094 module_exit(exit_rpcsec_gss)