1 files changed, 1152 insertions, 0 deletions

diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
new file mode 100644
index 00000000000..a33b627cbef
--- /dev/null
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -0,0 +1,1152 @@
+/*
+ * linux/net/sunrpc/auth_gss.c
+ *
+ * RPCSEC_GSS client authentication.
+ * 
+ *  Copyright (c) 2000 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Dug Song       <dugsong@monkey.org>
+ *  Andy Adamson   <andros@umich.edu>
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *  3. Neither the name of the University nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $Id$
+ */
+
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/sched.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/auth.h>
+#include <linux/sunrpc/auth_gss.h>
+#include <linux/sunrpc/svcauth_gss.h>
+#include <linux/sunrpc/gss_err.h>
+#include <linux/workqueue.h>
+#include <linux/sunrpc/rpc_pipe_fs.h>
+#include <linux/sunrpc/gss_api.h>
+#include <asm/uaccess.h>
+
+static struct rpc_authops authgss_ops;
+
+static struct rpc_credops gss_credops;
+
+#ifdef RPC_DEBUG
+# define RPCDBG_FACILITY	RPCDBG_AUTH
+#endif
+
+#define NFS_NGROUPS	16
+
+#define GSS_CRED_EXPIRE		(60 * HZ)	/* XXX: reasonable? */
+#define GSS_CRED_SLACK		1024		/* XXX: unused */
+/* length of a krb5 verifier (48), plus data added before arguments when
+ * using integrity (two 4-byte integers): */
+#define GSS_VERF_SLACK		56
+
+/* XXX this define must match the gssd define
+* as it is passed to gssd to signal the use of
+* machine creds should be part of the shared rpc interface */
+
+#define CA_RUN_AS_MACHINE  0x00000200 
+
+/* dump the buffer in `emacs-hexl' style */
+#define isprint(c)      ((c > 0x1f) && (c < 0x7f))
+
+static DEFINE_RWLOCK(gss_ctx_lock);
+
+struct gss_auth {
+	struct rpc_auth rpc_auth;
+	struct gss_api_mech *mech;
+	enum rpc_gss_svc service;
+	struct list_head upcalls;
+	struct rpc_clnt *client;
+	struct dentry *dentry;
+	char path[48];
+	spinlock_t lock;
+};
+
+static void gss_destroy_ctx(struct gss_cl_ctx *);
+static struct rpc_pipe_ops gss_upcall_ops;
+
+void
+print_hexl(u32 *p, u_int length, u_int offset)
+{
+	u_int i, j, jm;
+	u8 c, *cp;
+	
+	dprintk("RPC: print_hexl: length %d\n",length);
+	dprintk("\n");
+	cp = (u8 *) p;
+	
+	for (i = 0; i < length; i += 0x10) {
+		dprintk("  %04x: ", (u_int)(i + offset));
+		jm = length - i;
+		jm = jm > 16 ? 16 : jm;
+		
+		for (j = 0; j < jm; j++) {
+			if ((j % 2) == 1)
+				dprintk("%02x ", (u_int)cp[i+j]);
+			else
+				dprintk("%02x", (u_int)cp[i+j]);
+		}
+		for (; j < 16; j++) {
+			if ((j % 2) == 1)
+				dprintk("   ");
+			else
+				dprintk("  ");
+		}
+		dprintk(" ");
+		
+		for (j = 0; j < jm; j++) {
+			c = cp[i+j];
+			c = isprint(c) ? c : '.';
+			dprintk("%c", c);
+		}
+		dprintk("\n");
+	}
+}
+
+EXPORT_SYMBOL(print_hexl);
+
+static inline struct gss_cl_ctx *
+gss_get_ctx(struct gss_cl_ctx *ctx)
+{
+	atomic_inc(&ctx->count);
+	return ctx;
+}
+
+static inline void
+gss_put_ctx(struct gss_cl_ctx *ctx)
+{
+	if (atomic_dec_and_test(&ctx->count))
+		gss_destroy_ctx(ctx);
+}
+
+static void
+gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
+{
+	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
+	struct gss_cl_ctx *old;
+	write_lock(&gss_ctx_lock);
+	old = gss_cred->gc_ctx;
+	gss_cred->gc_ctx = ctx;
+	cred->cr_flags |= RPCAUTH_CRED_UPTODATE;
+	write_unlock(&gss_ctx_lock);
+	if (old)
+		gss_put_ctx(old);
+}
+
+static int
+gss_cred_is_uptodate_ctx(struct rpc_cred *cred)
+{
+	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
+	int res = 0;
+
+	read_lock(&gss_ctx_lock);
+	if ((cred->cr_flags & RPCAUTH_CRED_UPTODATE) && gss_cred->gc_ctx)
+		res = 1;
+	read_unlock(&gss_ctx_lock);
+	return res;
+}
+
+static const void *
+simple_get_bytes(const void *p, const void *end, void *res, size_t len)
+{
+	const void *q = (const void *)((const char *)p + len);
+	if (unlikely(q > end || q < p))
+		return ERR_PTR(-EFAULT);
+	memcpy(res, p, len);
+	return q;
+}
+
+static inline const void *
+simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
+{
+	const void *q;
+	unsigned int len;
+
+	p = simple_get_bytes(p, end, &len, sizeof(len));
+	if (IS_ERR(p))
+		return p;
+	q = (const void *)((const char *)p + len);
+	if (unlikely(q > end || q < p))
+		return ERR_PTR(-EFAULT);
+	dest->data = kmalloc(len, GFP_KERNEL);
+	if (unlikely(dest->data == NULL))
+		return ERR_PTR(-ENOMEM);
+	dest->len = len;
+	memcpy(dest->data, p, len);
+	return q;
+}
+
+static struct gss_cl_ctx *
+gss_cred_get_ctx(struct rpc_cred *cred)
+{
+	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
+	struct gss_cl_ctx *ctx = NULL;
+
+	read_lock(&gss_ctx_lock);
+	if (gss_cred->gc_ctx)
+		ctx = gss_get_ctx(gss_cred->gc_ctx);
+	read_unlock(&gss_ctx_lock);
+	return ctx;
+}
+
+static struct gss_cl_ctx *
+gss_alloc_context(void)
+{
+	struct gss_cl_ctx *ctx;
+
+	ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
+	if (ctx != NULL) {
+		memset(ctx, 0, sizeof(*ctx));
+		ctx->gc_proc = RPC_GSS_PROC_DATA;
+		ctx->gc_seq = 1;	/* NetApp 6.4R1 doesn't accept seq. no. 0 */
+		spin_lock_init(&ctx->gc_seq_lock);
+		atomic_set(&ctx->count,1);
+	}
+	return ctx;
+}
+
+#define GSSD_MIN_TIMEOUT (60 * 60)
+static const void *
+gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm)
+{
+	const void *q;
+	unsigned int seclen;
+	unsigned int timeout;
+	u32 window_size;
+	int ret;
+
+	/* First unsigned int gives the lifetime (in seconds) of the cred */
+	p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
+	if (IS_ERR(p))
+		goto err;
+	if (timeout == 0)
+		timeout = GSSD_MIN_TIMEOUT;
+	ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4;
+	/* Sequence number window. Determines the maximum number of simultaneous requests */
+	p = simple_get_bytes(p, end, &window_size, sizeof(window_size));
+	if (IS_ERR(p))
+		goto err;
+	ctx->gc_win = window_size;
+	/* gssd signals an error by passing ctx->gc_win = 0: */
+	if (ctx->gc_win == 0) {
+		/* in which case, p points to  an error code which we ignore */
+		p = ERR_PTR(-EACCES);
+		goto err;
+	}
+	/* copy the opaque wire context */
+	p = simple_get_netobj(p, end, &ctx->gc_wire_ctx);
+	if (IS_ERR(p))
+		goto err;
+	/* import the opaque security context */
+	p  = simple_get_bytes(p, end, &seclen, sizeof(seclen));
+	if (IS_ERR(p))
+		goto err;
+	q = (const void *)((const char *)p + seclen);
+	if (unlikely(q > end || q < p)) {
+		p = ERR_PTR(-EFAULT);
+		goto err;
+	}
+	ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx);
+	if (ret < 0) {
+		p = ERR_PTR(ret);
+		goto err;
+	}
+	return q;
+err:
+	dprintk("RPC:      gss_fill_context returning %ld\n", -PTR_ERR(p));
+	return p;
+}
+
+
+struct gss_upcall_msg {
+	atomic_t count;
+	uid_t	uid;
+	struct rpc_pipe_msg msg;
+	struct list_head list;
+	struct gss_auth *auth;
+	struct rpc_wait_queue rpc_waitqueue;
+	wait_queue_head_t waitqueue;
+	struct gss_cl_ctx *ctx;
+};
+
+static void
+gss_release_msg(struct gss_upcall_msg *gss_msg)
+{
+	if (!atomic_dec_and_test(&gss_msg->count))
+		return;
+	BUG_ON(!list_empty(&gss_msg->list));
+	if (gss_msg->ctx != NULL)
+		gss_put_ctx(gss_msg->ctx);
+	kfree(gss_msg);
+}
+
+static struct gss_upcall_msg *
+__gss_find_upcall(struct gss_auth *gss_auth, uid_t uid)
+{
+	struct gss_upcall_msg *pos;
+	list_for_each_entry(pos, &gss_auth->upcalls, list) {
+		if (pos->uid != uid)
+			continue;
+		atomic_inc(&pos->count);
+		dprintk("RPC:      gss_find_upcall found msg %p\n", pos);
+		return pos;
+	}
+	dprintk("RPC:      gss_find_upcall found nothing\n");
+	return NULL;
+}
+
+/* Try to add a upcall to the pipefs queue.
+ * If an upcall owned by our uid already exists, then we return a reference
+ * to that upcall instead of adding the new upcall.
+ */
+static inline struct gss_upcall_msg *
+gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg)
+{
+	struct gss_upcall_msg *old;
+
+	spin_lock(&gss_auth->lock);
+	old = __gss_find_upcall(gss_auth, gss_msg->uid);
+	if (old == NULL) {
+		atomic_inc(&gss_msg->count);
+		list_add(&gss_msg->list, &gss_auth->upcalls);
+	} else
+		gss_msg = old;
+	spin_unlock(&gss_auth->lock);
+	return gss_msg;
+}
+
+static void
+__gss_unhash_msg(struct gss_upcall_msg *gss_msg)
+{
+	if (list_empty(&gss_msg->list))
+		return;
+	list_del_init(&gss_msg->list);
+	rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
+	wake_up_all(&gss_msg->waitqueue);
+	atomic_dec(&gss_msg->count);
+}
+
+static void
+gss_unhash_msg(struct gss_upcall_msg *gss_msg)
+{
+	struct gss_auth *gss_auth = gss_msg->auth;
+
+	spin_lock(&gss_auth->lock);
+	__gss_unhash_msg(gss_msg);
+	spin_unlock(&gss_auth->lock);
+}
+
+static void
+gss_upcall_callback(struct rpc_task *task)
+{
+	struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred,
+			struct gss_cred, gc_base);
+	struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
+
+	BUG_ON(gss_msg == NULL);
+	if (gss_msg->ctx)
+		gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx));
+	else
+		task->tk_status = gss_msg->msg.errno;
+	spin_lock(&gss_msg->auth->lock);
+	gss_cred->gc_upcall = NULL;
+	rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
+	spin_unlock(&gss_msg->auth->lock);
+	gss_release_msg(gss_msg);
+}
+
+static inline struct gss_upcall_msg *
+gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid)
+{
+	struct gss_upcall_msg *gss_msg;
+
+	gss_msg = kmalloc(sizeof(*gss_msg), GFP_KERNEL);
+	if (gss_msg != NULL) {
+		memset(gss_msg, 0, sizeof(*gss_msg));
+		INIT_LIST_HEAD(&gss_msg->list);
+		rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
+		init_waitqueue_head(&gss_msg->waitqueue);
+		atomic_set(&gss_msg->count, 1);
+		gss_msg->msg.data = &gss_msg->uid;
+		gss_msg->msg.len = sizeof(gss_msg->uid);
+		gss_msg->uid = uid;
+		gss_msg->auth = gss_auth;
+	}
+	return gss_msg;
+}
+
+static struct gss_upcall_msg *
+gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred)
+{
+	struct gss_upcall_msg *gss_new, *gss_msg;
+
+	gss_new = gss_alloc_msg(gss_auth, cred->cr_uid);
+	if (gss_new == NULL)
+		return ERR_PTR(-ENOMEM);
+	gss_msg = gss_add_msg(gss_auth, gss_new);
+	if (gss_msg == gss_new) {
+		int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg);
+		if (res) {
+			gss_unhash_msg(gss_new);
+			gss_msg = ERR_PTR(res);
+		}
+	} else
+		gss_release_msg(gss_new);
+	return gss_msg;
+}
+
+static inline int
+gss_refresh_upcall(struct rpc_task *task)
+{
+	struct rpc_cred *cred = task->tk_msg.rpc_cred;
+	struct gss_auth *gss_auth = container_of(task->tk_client->cl_auth,
+			struct gss_auth, rpc_auth);
+	struct gss_cred *gss_cred = container_of(cred,
+			struct gss_cred, gc_base);
+	struct gss_upcall_msg *gss_msg;
+	int err = 0;
+
+	dprintk("RPC: %4u gss_refresh_upcall for uid %u\n", task->tk_pid, cred->cr_uid);
+	gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred);
+	if (IS_ERR(gss_msg)) {
+		err = PTR_ERR(gss_msg);
+		goto out;
+	}
+	spin_lock(&gss_auth->lock);
+	if (gss_cred->gc_upcall != NULL)
+		rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL);
+	else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
+		task->tk_timeout = 0;
+		gss_cred->gc_upcall = gss_msg;
+		/* gss_upcall_callback will release the reference to gss_upcall_msg */
+		atomic_inc(&gss_msg->count);
+		rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL);
+	} else
+		err = gss_msg->msg.errno;
+	spin_unlock(&gss_auth->lock);
+	gss_release_msg(gss_msg);
+out:
+	dprintk("RPC: %4u gss_refresh_upcall for uid %u result %d\n", task->tk_pid,
+			cred->cr_uid, err);
+	return err;
+}
+
+static inline int
+gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
+{
+	struct rpc_cred *cred = &gss_cred->gc_base;
+	struct gss_upcall_msg *gss_msg;
+	DEFINE_WAIT(wait);
+	int err = 0;
+
+	dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid);
+	gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred);
+	if (IS_ERR(gss_msg)) {
+		err = PTR_ERR(gss_msg);
+		goto out;
+	}
+	for (;;) {
+		prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE);
+		spin_lock(&gss_auth->lock);
+		if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
+			spin_unlock(&gss_auth->lock);
+			break;
+		}
+		spin_unlock(&gss_auth->lock);
+		if (signalled()) {
+			err = -ERESTARTSYS;
+			goto out_intr;
+		}
+		schedule();
+	}
+	if (gss_msg->ctx)
+		gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx));
+	else
+		err = gss_msg->msg.errno;
+out_intr:
+	finish_wait(&gss_msg->waitqueue, &wait);
+	gss_release_msg(gss_msg);
+out:
+	dprintk("RPC: gss_create_upcall for uid %u result %d\n", cred->cr_uid, err);
+	return err;
+}
+
+static ssize_t
+gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
+		char __user *dst, size_t buflen)
+{
+	char *data = (char *)msg->data + msg->copied;
+	ssize_t mlen = msg->len;
+	ssize_t left;
+
+	if (mlen > buflen)
+		mlen = buflen;
+	left = copy_to_user(dst, data, mlen);
+	if (left < 0) {
+		msg->errno = left;
+		return left;
+	}
+	mlen -= left;
+	msg->copied += mlen;
+	msg->errno = 0;
+	return mlen;
+}
+
+#define MSG_BUF_MAXSIZE 1024
+
+static ssize_t
+gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
+{
+	const void *p, *end;
+	void *buf;
+	struct rpc_clnt *clnt;
+	struct gss_auth *gss_auth;
+	struct rpc_cred *cred;
+	struct gss_upcall_msg *gss_msg;
+	struct gss_cl_ctx *ctx;
+	uid_t uid;
+	int err = -EFBIG;
+
+	if (mlen > MSG_BUF_MAXSIZE)
+		goto out;
+	err = -ENOMEM;
+	buf = kmalloc(mlen, GFP_KERNEL);
+	if (!buf)
+		goto out;
+
+	clnt = RPC_I(filp->f_dentry->d_inode)->private;
+	err = -EFAULT;
+	if (copy_from_user(buf, src, mlen))
+		goto err;
+
+	end = (const void *)((char *)buf + mlen);
+	p = simple_get_bytes(buf, end, &uid, sizeof(uid));
+	if (IS_ERR(p)) {
+		err = PTR_ERR(p);
+		goto err;
+	}
+
+	err = -ENOMEM;
+	ctx = gss_alloc_context();
+	if (ctx == NULL)
+		goto err;
+	err = 0;
+	gss_auth = container_of(clnt->cl_auth, struct gss_auth, rpc_auth);
+	p = gss_fill_context(p, end, ctx, gss_auth->mech);
+	if (IS_ERR(p)) {
+		err = PTR_ERR(p);
+		if (err != -EACCES)
+			goto err_put_ctx;
+	}
+	spin_lock(&gss_auth->lock);
+	gss_msg = __gss_find_upcall(gss_auth, uid);
+	if (gss_msg) {
+		if (err == 0 && gss_msg->ctx == NULL)
+			gss_msg->ctx = gss_get_ctx(ctx);
+		gss_msg->msg.errno = err;
+		__gss_unhash_msg(gss_msg);
+		spin_unlock(&gss_auth->lock);
+		gss_release_msg(gss_msg);
+	} else {
+		struct auth_cred acred = { .uid = uid };
+		spin_unlock(&gss_auth->lock);
+		cred = rpcauth_lookup_credcache(clnt->cl_auth, &acred, 0);
+		if (IS_ERR(cred)) {
+			err = PTR_ERR(cred);
+			goto err_put_ctx;
+		}
+		gss_cred_set_ctx(cred, gss_get_ctx(ctx));
+	}
+	gss_put_ctx(ctx);
+	kfree(buf);
+	dprintk("RPC:      gss_pipe_downcall returning length %Zu\n", mlen);
+	return mlen;
+err_put_ctx:
+	gss_put_ctx(ctx);
+err:
+	kfree(buf);
+out:
+	dprintk("RPC:      gss_pipe_downcall returning %d\n", err);
+	return err;
+}
+
+static void
+gss_pipe_release(struct inode *inode)
+{
+	struct rpc_inode *rpci = RPC_I(inode);
+	struct rpc_clnt *clnt;
+	struct rpc_auth *auth;
+	struct gss_auth *gss_auth;
+
+	clnt = rpci->private;
+	auth = clnt->cl_auth;
+	gss_auth = container_of(auth, struct gss_auth, rpc_auth);
+	spin_lock(&gss_auth->lock);
+	while (!list_empty(&gss_auth->upcalls)) {
+		struct gss_upcall_msg *gss_msg;
+
+		gss_msg = list_entry(gss_auth->upcalls.next,
+				struct gss_upcall_msg, list);
+		gss_msg->msg.errno = -EPIPE;
+		atomic_inc(&gss_msg->count);
+		__gss_unhash_msg(gss_msg);
+		spin_unlock(&gss_auth->lock);
+		gss_release_msg(gss_msg);
+		spin_lock(&gss_auth->lock);
+	}
+	spin_unlock(&gss_auth->lock);
+}
+
+static void
+gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
+{
+	struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
+	static unsigned long ratelimit;
+
+	if (msg->errno < 0) {
+		dprintk("RPC:      gss_pipe_destroy_msg releasing msg %p\n",
+				gss_msg);
+		atomic_inc(&gss_msg->count);
+		gss_unhash_msg(gss_msg);
+		if (msg->errno == -ETIMEDOUT || msg->errno == -EPIPE) {
+			unsigned long now = jiffies;
+			if (time_after(now, ratelimit)) {
+				printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n"
+						    "Please check user daemon is running!\n");
+				ratelimit = now + 15*HZ;
+			}
+		}
+		gss_release_msg(gss_msg);
+	}
+}
+
+/* 
+ * NOTE: we have the opportunity to use different 
+ * parameters based on the input flavor (which must be a pseudoflavor)
+ */
+static struct rpc_auth *
+gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
+{
+	struct gss_auth *gss_auth;
+	struct rpc_auth * auth;
+
+	dprintk("RPC:      creating GSS authenticator for client %p\n",clnt);
+
+	if (!try_module_get(THIS_MODULE))
+		return NULL;
+	if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
+		goto out_dec;
+	gss_auth->client = clnt;
+	gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
+	if (!gss_auth->mech) {
+		printk(KERN_WARNING "%s: Pseudoflavor %d not found!",
+				__FUNCTION__, flavor);
+		goto err_free;
+	}
+	gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
+	/* FIXME: Will go away once privacy support is merged in */
+	if (gss_auth->service == RPC_GSS_SVC_PRIVACY)
+		gss_auth->service = RPC_GSS_SVC_INTEGRITY;
+	INIT_LIST_HEAD(&gss_auth->upcalls);
+	spin_lock_init(&gss_auth->lock);
+	auth = &gss_auth->rpc_auth;
+	auth->au_cslack = GSS_CRED_SLACK >> 2;
+	auth->au_rslack = GSS_VERF_SLACK >> 2;
+	auth->au_ops = &authgss_ops;
+	auth->au_flavor = flavor;
+	atomic_set(&auth->au_count, 1);
+
+	if (rpcauth_init_credcache(auth, GSS_CRED_EXPIRE) < 0)
+		goto err_put_mech;
+
+	snprintf(gss_auth->path, sizeof(gss_auth->path), "%s/%s",
+			clnt->cl_pathname,
+			gss_auth->mech->gm_name);
+	gss_auth->dentry = rpc_mkpipe(gss_auth->path, clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
+	if (IS_ERR(gss_auth->dentry))
+		goto err_put_mech;
+
+	return auth;
+err_put_mech:
+	gss_mech_put(gss_auth->mech);
+err_free:
+	kfree(gss_auth);
+out_dec:
+	module_put(THIS_MODULE);
+	return NULL;
+}
+
+static void
+gss_destroy(struct rpc_auth *auth)
+{
+	struct gss_auth *gss_auth;
+
+	dprintk("RPC:      destroying GSS authenticator %p flavor %d\n",
+		auth, auth->au_flavor);
+
+	gss_auth = container_of(auth, struct gss_auth, rpc_auth);
+	rpc_unlink(gss_auth->path);
+	gss_mech_put(gss_auth->mech);
+
+	rpcauth_free_credcache(auth);
+	kfree(gss_auth);
+	module_put(THIS_MODULE);
+}
+
+/* gss_destroy_cred (and gss_destroy_ctx) are used to clean up after failure
+ * to create a new cred or context, so they check that things have been
+ * allocated before freeing them. */
+static void
+gss_destroy_ctx(struct gss_cl_ctx *ctx)
+{
+	dprintk("RPC:      gss_destroy_ctx\n");
+
+	if (ctx->gc_gss_ctx)
+		gss_delete_sec_context(&ctx->gc_gss_ctx);
+
+	kfree(ctx->gc_wire_ctx.data);
+	kfree(ctx);
+}
+
+static void
+gss_destroy_cred(struct rpc_cred *rc)
+{
+	struct gss_cred *cred = container_of(rc, struct gss_cred, gc_base);
+
+	dprintk("RPC:      gss_destroy_cred \n");
+
+	if (cred->gc_ctx)
+		gss_put_ctx(cred->gc_ctx);
+	kfree(cred);
+}
+
+/*
+ * Lookup RPCSEC_GSS cred for the current process
+ */
+static struct rpc_cred *
+gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int taskflags)
+{
+	return rpcauth_lookup_credcache(auth, acred, taskflags);
+}
+
+static struct rpc_cred *
+gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int taskflags)
+{
+	struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
+	struct gss_cred	*cred = NULL;
+	int err = -ENOMEM;
+
+	dprintk("RPC:      gss_create_cred for uid %d, flavor %d\n",
+		acred->uid, auth->au_flavor);
+
+	if (!(cred = kmalloc(sizeof(*cred), GFP_KERNEL)))
+		goto out_err;
+
+	memset(cred, 0, sizeof(*cred));
+	atomic_set(&cred->gc_count, 1);
+	cred->gc_uid = acred->uid;
+	/*
+	 * Note: in order to force a call to call_refresh(), we deliberately
+	 * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
+	 */
+	cred->gc_flags = 0;
+	cred->gc_base.cr_ops = &gss_credops;
+	cred->gc_service = gss_auth->service;
+	err = gss_create_upcall(gss_auth, cred);
+	if (err < 0)
+		goto out_err;
+
+	return &cred->gc_base;
+
+out_err:
+	dprintk("RPC:      gss_create_cred failed with error %d\n", err);
+	if (cred) gss_destroy_cred(&cred->gc_base);
+	return ERR_PTR(err);
+}
+
+static int
+gss_match(struct auth_cred *acred, struct rpc_cred *rc, int taskflags)
+{
+	struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
+
+	/* Don't match with creds that have expired. */
+	if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry))
+		return 0;
+	return (rc->cr_uid == acred->uid);
+}
+
+/*
+* Marshal credentials.
+* Maybe we should keep a cached credential for performance reasons.
+*/
+static u32 *
+gss_marshal(struct rpc_task *task, u32 *p)
+{
+	struct rpc_cred *cred = task->tk_msg.rpc_cred;
+	struct gss_cred	*gss_cred = container_of(cred, struct gss_cred,
+						 gc_base);
+	struct gss_cl_ctx	*ctx = gss_cred_get_ctx(cred);
+	u32		*cred_len;
+	struct rpc_rqst *req = task->tk_rqstp;
+	u32             maj_stat = 0;
+	struct xdr_netobj mic;
+	struct kvec	iov;
+	struct xdr_buf	verf_buf;
+
+	dprintk("RPC: %4u gss_marshal\n", task->tk_pid);
+
+	*p++ = htonl(RPC_AUTH_GSS);
+	cred_len = p++;
+
+	spin_lock(&ctx->gc_seq_lock);
+	req->rq_seqno = ctx->gc_seq++;
+	spin_unlock(&ctx->gc_seq_lock);
+
+	*p++ = htonl((u32) RPC_GSS_VERSION);
+	*p++ = htonl((u32) ctx->gc_proc);
+	*p++ = htonl((u32) req->rq_seqno);
+	*p++ = htonl((u32) gss_cred->gc_service);
+	p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
+	*cred_len = htonl((p - (cred_len + 1)) << 2);
+
+	/* We compute the checksum for the verifier over the xdr-encoded bytes
+	 * starting with the xid and ending at the end of the credential: */
+	iov.iov_base = req->rq_snd_buf.head[0].iov_base;
+	if (task->tk_client->cl_xprt->stream)
+		/* See clnt.c:call_header() */
+		iov.iov_base += 4;
+	iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
+	xdr_buf_from_iov(&iov, &verf_buf);
+
+	/* set verifier flavor*/
+	*p++ = htonl(RPC_AUTH_GSS);
+
+	mic.data = (u8 *)(p + 1);
+	maj_stat = gss_get_mic(ctx->gc_gss_ctx,
+			       GSS_C_QOP_DEFAULT, 
+			       &verf_buf, &mic);
+	if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
+		cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
+	} else if (maj_stat != 0) {
+		printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
+		goto out_put_ctx;
+	}
+	p = xdr_encode_opaque(p, NULL, mic.len);
+	gss_put_ctx(ctx);
+	return p;
+out_put_ctx:
+	gss_put_ctx(ctx);
+	return NULL;
+}
+
+/*
+* Refresh credentials. XXX - finish
+*/
+static int
+gss_refresh(struct rpc_task *task)
+{
+
+	if (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred))
+		return gss_refresh_upcall(task);
+	return 0;
+}
+
+static u32 *
+gss_validate(struct rpc_task *task, u32 *p)
+{
+	struct rpc_cred *cred = task->tk_msg.rpc_cred;
+	struct gss_cred	*gss_cred = container_of(cred, struct gss_cred,
+						gc_base);
+	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
+	u32		seq, qop_state;
+	struct kvec	iov;
+	struct xdr_buf	verf_buf;
+	struct xdr_netobj mic;
+	u32		flav,len;
+	u32		maj_stat;
+
+	dprintk("RPC: %4u gss_validate\n", task->tk_pid);
+
+	flav = ntohl(*p++);
+	if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
+                goto out_bad;
+	if (flav != RPC_AUTH_GSS)
+		goto out_bad;
+	seq = htonl(task->tk_rqstp->rq_seqno);
+	iov.iov_base = &seq;
+	iov.iov_len = sizeof(seq);
+	xdr_buf_from_iov(&iov, &verf_buf);
+	mic.data = (u8 *)p;
+	mic.len = len;
+
+	maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic, &qop_state);
+	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
+		cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
+	if (maj_stat)
+		goto out_bad;
+       switch (gss_cred->gc_service) {
+       case RPC_GSS_SVC_NONE:
+	       /* verifier data, flavor, length: */
+	       task->tk_auth->au_rslack = XDR_QUADLEN(len) + 2;
+	       break;
+       case RPC_GSS_SVC_INTEGRITY:
+	       /* verifier data, flavor, length, length, sequence number: */
+	       task->tk_auth->au_rslack = XDR_QUADLEN(len) + 4;
+	       break;
+       case RPC_GSS_SVC_PRIVACY:
+	       goto out_bad;
+       }
+	gss_put_ctx(ctx);
+	dprintk("RPC: %4u GSS gss_validate: gss_verify_mic succeeded.\n",
+			task->tk_pid);
+	return p + XDR_QUADLEN(len);
+out_bad:
+	gss_put_ctx(ctx);
+	dprintk("RPC: %4u gss_validate failed.\n", task->tk_pid);
+	return NULL;
+}
+
+static inline int
+gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
+		kxdrproc_t encode, struct rpc_rqst *rqstp, u32 *p, void *obj)
+{
+	struct xdr_buf	*snd_buf = &rqstp->rq_snd_buf;
+	struct xdr_buf	integ_buf;
+	u32             *integ_len = NULL;
+	struct xdr_netobj mic;
+	u32		offset, *q;
+	struct kvec	*iov;
+	u32             maj_stat = 0;
+	int		status = -EIO;
+
+	integ_len = p++;
+	offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
+	*p++ = htonl(rqstp->rq_seqno);
+
+	status = encode(rqstp, p, obj);
+	if (status)
+		return status;
+
+	if (xdr_buf_subsegment(snd_buf, &integ_buf,
+				offset, snd_buf->len - offset))
+		return status;
+	*integ_len = htonl(integ_buf.len);
+
+	/* guess whether we're in the head or the tail: */
+	if (snd_buf->page_len || snd_buf->tail[0].iov_len) 
+		iov = snd_buf->tail;
+	else
+		iov = snd_buf->head;
+	p = iov->iov_base + iov->iov_len;
+	mic.data = (u8 *)(p + 1);
+
+	maj_stat = gss_get_mic(ctx->gc_gss_ctx,
+			GSS_C_QOP_DEFAULT, &integ_buf, &mic);
+	status = -EIO; /* XXX? */
+	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
+		cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
+	else if (maj_stat)
+		return status;
+	q = xdr_encode_opaque(p, NULL, mic.len);
+
+	offset = (u8 *)q - (u8 *)p;
+	iov->iov_len += offset;
+	snd_buf->len += offset;
+	return 0;
+}
+
+static int
+gss_wrap_req(struct rpc_task *task,
+	     kxdrproc_t encode, void *rqstp, u32 *p, void *obj)
+{
+	struct rpc_cred *cred = task->tk_msg.rpc_cred;
+	struct gss_cred	*gss_cred = container_of(cred, struct gss_cred,
+			gc_base);
+	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
+	int             status = -EIO;
+
+	dprintk("RPC: %4u gss_wrap_req\n", task->tk_pid);
+	if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
+		/* The spec seems a little ambiguous here, but I think that not
+		 * wrapping context destruction requests makes the most sense.
+		 */
+		status = encode(rqstp, p, obj);
+		goto out;
+	}
+	switch (gss_cred->gc_service) {
+		case RPC_GSS_SVC_NONE:
+			status = encode(rqstp, p, obj);
+			break;
+		case RPC_GSS_SVC_INTEGRITY:
+			status = gss_wrap_req_integ(cred, ctx, encode,
+								rqstp, p, obj);
+			break;
+       		case RPC_GSS_SVC_PRIVACY:
+			break;
+	}
+out:
+	gss_put_ctx(ctx);
+	dprintk("RPC: %4u gss_wrap_req returning %d\n", task->tk_pid, status);
+	return status;
+}
+
+static inline int
+gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
+		struct rpc_rqst *rqstp, u32 **p)
+{
+	struct xdr_buf	*rcv_buf = &rqstp->rq_rcv_buf;
+	struct xdr_buf integ_buf;
+	struct xdr_netobj mic;
+	u32 data_offset, mic_offset;
+	u32 integ_len;
+	u32 maj_stat;
+	int status = -EIO;
+
+	integ_len = ntohl(*(*p)++);
+	if (integ_len & 3)
+		return status;
+	data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
+	mic_offset = integ_len + data_offset;
+	if (mic_offset > rcv_buf->len)
+		return status;
+	if (ntohl(*(*p)++) != rqstp->rq_seqno)
+		return status;
+
+	if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset,
+				mic_offset - data_offset))
+		return status;
+
+	if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset))
+		return status;
+
+	maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf,
+			&mic, NULL);
+	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
+		cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
+	if (maj_stat != GSS_S_COMPLETE)
+		return status;
+	return 0;
+}
+
+static int
+gss_unwrap_resp(struct rpc_task *task,
+		kxdrproc_t decode, void *rqstp, u32 *p, void *obj)
+{
+	struct rpc_cred *cred = task->tk_msg.rpc_cred;
+	struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
+			gc_base);
+	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
+	int             status = -EIO;
+
+	if (ctx->gc_proc != RPC_GSS_PROC_DATA)
+		goto out_decode;
+	switch (gss_cred->gc_service) {
+		case RPC_GSS_SVC_NONE:
+			break;
+		case RPC_GSS_SVC_INTEGRITY:
+			status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p);
+			if (status)
+				goto out;
+			break;
+       		case RPC_GSS_SVC_PRIVACY:
+			break;
+	}
+out_decode:
+	status = decode(rqstp, p, obj);
+out:
+	gss_put_ctx(ctx);
+	dprintk("RPC: %4u gss_unwrap_resp returning %d\n", task->tk_pid,
+			status);
+	return status;
+}
+  
+static struct rpc_authops authgss_ops = {
+	.owner		= THIS_MODULE,
+	.au_flavor	= RPC_AUTH_GSS,
+#ifdef RPC_DEBUG
+	.au_name	= "RPCSEC_GSS",
+#endif
+	.create		= gss_create,
+	.destroy	= gss_destroy,
+	.lookup_cred	= gss_lookup_cred,
+	.crcreate	= gss_create_cred
+};
+
+static struct rpc_credops gss_credops = {
+	.cr_name	= "AUTH_GSS",
+	.crdestroy	= gss_destroy_cred,
+	.crmatch	= gss_match,
+	.crmarshal	= gss_marshal,
+	.crrefresh	= gss_refresh,
+	.crvalidate	= gss_validate,
+	.crwrap_req	= gss_wrap_req,
+	.crunwrap_resp	= gss_unwrap_resp,
+};
+
+static struct rpc_pipe_ops gss_upcall_ops = {
+	.upcall		= gss_pipe_upcall,
+	.downcall	= gss_pipe_downcall,
+	.destroy_msg	= gss_pipe_destroy_msg,
+	.release_pipe	= gss_pipe_release,
+};
+
+/*
+ * Initialize RPCSEC_GSS module
+ */
+static int __init init_rpcsec_gss(void)
+{
+	int err = 0;
+
+	err = rpcauth_register(&authgss_ops);
+	if (err)
+		goto out;
+	err = gss_svc_init();
+	if (err)
+		goto out_unregister;
+	return 0;
+out_unregister:
+	rpcauth_unregister(&authgss_ops);
+out:
+	return err;
+}
+
+static void __exit exit_rpcsec_gss(void)
+{
+	gss_svc_shutdown();
+	rpcauth_unregister(&authgss_ops);
+}
+
+MODULE_LICENSE("GPL");
+module_init(init_rpcsec_gss)
+module_exit(exit_rpcsec_gss)