auth_gss.c 42.2 KB
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/*
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 * linux/net/sunrpc/auth_gss/auth_gss.c
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 *
 * RPCSEC_GSS client authentication.
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 *
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 *  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.
 */


#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/sched.h>
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#include <linux/pagemap.h>
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#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>

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static const struct rpc_authops authgss_ops;
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static const struct rpc_credops gss_credops;
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static const struct rpc_credops gss_nullops;
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#define GSS_RETRY_EXPIRED 5
static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED;

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#ifdef RPC_DEBUG
# define RPCDBG_FACILITY	RPCDBG_AUTH
#endif

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#define GSS_CRED_SLACK		(RPC_MAX_AUTH_SIZE * 2)
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/* length of a krb5 verifier (48), plus data added before arguments when
 * using integrity (two 4-byte integers): */
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#define GSS_VERF_SLACK		100
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struct gss_auth {
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	struct kref kref;
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	struct rpc_auth rpc_auth;
	struct gss_api_mech *mech;
	enum rpc_gss_svc service;
	struct rpc_clnt *client;
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	/*
	 * There are two upcall pipes; dentry[1], named "gssd", is used
	 * for the new text-based upcall; dentry[0] is named after the
	 * mechanism (for example, "krb5") and exists for
	 * backwards-compatibility with older gssd's.
	 */
	struct dentry *dentry[2];
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};

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/* pipe_version >= 0 if and only if someone has a pipe open. */
static int pipe_version = -1;
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static atomic_t pipe_users = ATOMIC_INIT(0);
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static DEFINE_SPINLOCK(pipe_version_lock);
static struct rpc_wait_queue pipe_version_rpc_waitqueue;
static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue);
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static void gss_free_ctx(struct gss_cl_ctx *);
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static const struct rpc_pipe_ops gss_upcall_ops_v0;
static const struct rpc_pipe_ops gss_upcall_ops_v1;
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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))
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		gss_free_ctx(ctx);
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}

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/* gss_cred_set_ctx:
 * called by gss_upcall_callback and gss_create_upcall in order
 * to set the gss context. The actual exchange of an old context
 * and a new one is protected by the inode->i_lock.
 */
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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);
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	if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
		return;
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	gss_get_ctx(ctx);
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	rcu_assign_pointer(gss_cred->gc_ctx, ctx);
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	set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
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	smp_mb__before_clear_bit();
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	clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags);
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}

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);
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	dest->data = kmemdup(p, len, GFP_NOFS);
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	if (unlikely(dest->data == NULL))
		return ERR_PTR(-ENOMEM);
	dest->len = 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;

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	rcu_read_lock();
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	if (gss_cred->gc_ctx)
		ctx = gss_get_ctx(gss_cred->gc_ctx);
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	rcu_read_unlock();
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	return ctx;
}

static struct gss_cl_ctx *
gss_alloc_context(void)
{
	struct gss_cl_ctx *ctx;

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	ctx = kzalloc(sizeof(*ctx), GFP_NOFS);
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	if (ctx != NULL) {
		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) {
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		/*
		 * in which case, p points to an error code. Anything other
		 * than -EKEYEXPIRED gets converted to -EACCES.
		 */
		p = simple_get_bytes(p, end, &ret, sizeof(ret));
		if (!IS_ERR(p))
			p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) :
						    ERR_PTR(-EACCES);
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		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;
	}
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	ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, GFP_NOFS);
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	if (ret < 0) {
		p = ERR_PTR(ret);
		goto err;
	}
	return q;
err:
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	dprintk("RPC:       gss_fill_context returning %ld\n", -PTR_ERR(p));
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	return p;
}

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#define UPCALL_BUF_LEN 128
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struct gss_upcall_msg {
	atomic_t count;
	uid_t	uid;
	struct rpc_pipe_msg msg;
	struct list_head list;
	struct gss_auth *auth;
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	struct rpc_inode *inode;
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	struct rpc_wait_queue rpc_waitqueue;
	wait_queue_head_t waitqueue;
	struct gss_cl_ctx *ctx;
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	char databuf[UPCALL_BUF_LEN];
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};

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static int get_pipe_version(void)
{
	int ret;

	spin_lock(&pipe_version_lock);
	if (pipe_version >= 0) {
		atomic_inc(&pipe_users);
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		ret = pipe_version;
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	} else
		ret = -EAGAIN;
	spin_unlock(&pipe_version_lock);
	return ret;
}

static void put_pipe_version(void)
{
	if (atomic_dec_and_lock(&pipe_users, &pipe_version_lock)) {
		pipe_version = -1;
		spin_unlock(&pipe_version_lock);
	}
}

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static void
gss_release_msg(struct gss_upcall_msg *gss_msg)
{
	if (!atomic_dec_and_test(&gss_msg->count))
		return;
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	put_pipe_version();
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	BUG_ON(!list_empty(&gss_msg->list));
	if (gss_msg->ctx != NULL)
		gss_put_ctx(gss_msg->ctx);
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	rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue);
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	kfree(gss_msg);
}

static struct gss_upcall_msg *
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__gss_find_upcall(struct rpc_inode *rpci, uid_t uid)
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{
	struct gss_upcall_msg *pos;
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	list_for_each_entry(pos, &rpci->in_downcall, list) {
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		if (pos->uid != uid)
			continue;
		atomic_inc(&pos->count);
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		dprintk("RPC:       gss_find_upcall found msg %p\n", pos);
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		return pos;
	}
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	dprintk("RPC:       gss_find_upcall found nothing\n");
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	return NULL;
}

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/* Try to add an upcall to the pipefs queue.
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 * 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 *
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gss_add_msg(struct gss_upcall_msg *gss_msg)
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{
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	struct rpc_inode *rpci = gss_msg->inode;
	struct inode *inode = &rpci->vfs_inode;
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	struct gss_upcall_msg *old;

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	spin_lock(&inode->i_lock);
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	old = __gss_find_upcall(rpci, gss_msg->uid);
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	if (old == NULL) {
		atomic_inc(&gss_msg->count);
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		list_add(&gss_msg->list, &rpci->in_downcall);
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	} else
		gss_msg = old;
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	spin_unlock(&inode->i_lock);
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	return gss_msg;
}

static void
__gss_unhash_msg(struct gss_upcall_msg *gss_msg)
{
	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)
{
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	struct inode *inode = &gss_msg->inode->vfs_inode;
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	if (list_empty(&gss_msg->list))
		return;
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	spin_lock(&inode->i_lock);
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	if (!list_empty(&gss_msg->list))
		__gss_unhash_msg(gss_msg);
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	spin_unlock(&inode->i_lock);
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}

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static void
gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg)
{
	switch (gss_msg->msg.errno) {
	case 0:
		if (gss_msg->ctx == NULL)
			break;
		clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
		gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx);
		break;
	case -EKEYEXPIRED:
		set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
	}
	gss_cred->gc_upcall_timestamp = jiffies;
	gss_cred->gc_upcall = NULL;
	rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
}

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static void
gss_upcall_callback(struct rpc_task *task)
{
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	struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred,
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			struct gss_cred, gc_base);
	struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
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	struct inode *inode = &gss_msg->inode->vfs_inode;
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	spin_lock(&inode->i_lock);
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	gss_handle_downcall_result(gss_cred, gss_msg);
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	spin_unlock(&inode->i_lock);
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	task->tk_status = gss_msg->msg.errno;
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	gss_release_msg(gss_msg);
}

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static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg)
{
	gss_msg->msg.data = &gss_msg->uid;
	gss_msg->msg.len = sizeof(gss_msg->uid);
}

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static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
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				struct rpc_clnt *clnt, int machine_cred)
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{
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	struct gss_api_mech *mech = gss_msg->auth->mech;
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	char *p = gss_msg->databuf;
	int len = 0;

	gss_msg->msg.len = sprintf(gss_msg->databuf, "mech=%s uid=%d ",
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				   mech->gm_name,
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				   gss_msg->uid);
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	p += gss_msg->msg.len;
	if (clnt->cl_principal) {
		len = sprintf(p, "target=%s ", clnt->cl_principal);
		p += len;
		gss_msg->msg.len += len;
	}
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	if (machine_cred) {
		len = sprintf(p, "service=* ");
		p += len;
		gss_msg->msg.len += len;
	} else if (!strcmp(clnt->cl_program->name, "nfs4_cb")) {
		len = sprintf(p, "service=nfs ");
		p += len;
		gss_msg->msg.len += len;
	}
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	if (mech->gm_upcall_enctypes) {
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		len = sprintf(p, "enctypes=%s ", mech->gm_upcall_enctypes);
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		p += len;
		gss_msg->msg.len += len;
	}
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	len = sprintf(p, "\n");
	gss_msg->msg.len += len;

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	gss_msg->msg.data = gss_msg->databuf;
	BUG_ON(gss_msg->msg.len > UPCALL_BUF_LEN);
}

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static void gss_encode_msg(struct gss_upcall_msg *gss_msg,
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				struct rpc_clnt *clnt, int machine_cred)
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{
	if (pipe_version == 0)
		gss_encode_v0_msg(gss_msg);
	else /* pipe_version == 1 */
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		gss_encode_v1_msg(gss_msg, clnt, machine_cred);
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}

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static inline struct gss_upcall_msg *
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gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid, struct rpc_clnt *clnt,
		int machine_cred)
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{
	struct gss_upcall_msg *gss_msg;
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	int vers;
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	gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS);
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	if (gss_msg == NULL)
		return ERR_PTR(-ENOMEM);
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	vers = get_pipe_version();
	if (vers < 0) {
		kfree(gss_msg);
		return ERR_PTR(vers);
	}
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	gss_msg->inode = RPC_I(gss_auth->dentry[vers]->d_inode);
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	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->uid = uid;
	gss_msg->auth = gss_auth;
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	gss_encode_msg(gss_msg, clnt, machine_cred);
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	return gss_msg;
}

static struct gss_upcall_msg *
gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred)
{
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	struct gss_cred *gss_cred = container_of(cred,
			struct gss_cred, gc_base);
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	struct gss_upcall_msg *gss_new, *gss_msg;
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	uid_t uid = cred->cr_uid;
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	gss_new = gss_alloc_msg(gss_auth, uid, clnt, gss_cred->gc_machine_cred);
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	if (IS_ERR(gss_new))
		return gss_new;
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	gss_msg = gss_add_msg(gss_new);
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	if (gss_msg == gss_new) {
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		struct inode *inode = &gss_new->inode->vfs_inode;
		int res = rpc_queue_upcall(inode, &gss_new->msg);
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		if (res) {
			gss_unhash_msg(gss_new);
			gss_msg = ERR_PTR(res);
		}
	} else
		gss_release_msg(gss_new);
	return gss_msg;
}

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static void warn_gssd(void)
{
	static unsigned long ratelimit;
	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;
	}
}

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static inline int
gss_refresh_upcall(struct rpc_task *task)
{
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	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
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	struct gss_auth *gss_auth = container_of(cred->cr_auth,
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			struct gss_auth, rpc_auth);
	struct gss_cred *gss_cred = container_of(cred,
			struct gss_cred, gc_base);
	struct gss_upcall_msg *gss_msg;
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	struct inode *inode;
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	int err = 0;

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	dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid,
								cred->cr_uid);
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	gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred);
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	if (PTR_ERR(gss_msg) == -EAGAIN) {
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		/* XXX: warning on the first, under the assumption we
		 * shouldn't normally hit this case on a refresh. */
		warn_gssd();
		task->tk_timeout = 15*HZ;
		rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL);
523
		return -EAGAIN;
524
	}
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Linus Torvalds 已提交
525 526 527 528
	if (IS_ERR(gss_msg)) {
		err = PTR_ERR(gss_msg);
		goto out;
	}
529
	inode = &gss_msg->inode->vfs_inode;
530
	spin_lock(&inode->i_lock);
L
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531
	if (gss_cred->gc_upcall != NULL)
532
		rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
533
	else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
L
Linus Torvalds 已提交
534 535 536 537
		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);
538
		rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback);
539 540
	} else {
		gss_handle_downcall_result(gss_cred, gss_msg);
L
Linus Torvalds 已提交
541
		err = gss_msg->msg.errno;
542
	}
543
	spin_unlock(&inode->i_lock);
L
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544 545
	gss_release_msg(gss_msg);
out:
546 547
	dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n",
			task->tk_pid, cred->cr_uid, err);
L
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548 549 550 551 552 553
	return err;
}

static inline int
gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
{
554
	struct inode *inode;
L
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555 556 557 558 559
	struct rpc_cred *cred = &gss_cred->gc_base;
	struct gss_upcall_msg *gss_msg;
	DEFINE_WAIT(wait);
	int err = 0;

560
	dprintk("RPC:       gss_upcall for uid %u\n", cred->cr_uid);
561
retry:
L
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562
	gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred);
563 564 565
	if (PTR_ERR(gss_msg) == -EAGAIN) {
		err = wait_event_interruptible_timeout(pipe_version_waitqueue,
				pipe_version >= 0, 15*HZ);
566 567 568 569
		if (pipe_version < 0) {
			warn_gssd();
			err = -EACCES;
		}
570 571 572 573
		if (err)
			goto out;
		goto retry;
	}
L
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574 575 576 577
	if (IS_ERR(gss_msg)) {
		err = PTR_ERR(gss_msg);
		goto out;
	}
578
	inode = &gss_msg->inode->vfs_inode;
L
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579 580
	for (;;) {
		prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE);
581
		spin_lock(&inode->i_lock);
L
Linus Torvalds 已提交
582 583 584
		if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
			break;
		}
585
		spin_unlock(&inode->i_lock);
L
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586 587 588 589 590 591 592
		if (signalled()) {
			err = -ERESTARTSYS;
			goto out_intr;
		}
		schedule();
	}
	if (gss_msg->ctx)
593
		gss_cred_set_ctx(cred, gss_msg->ctx);
L
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594 595
	else
		err = gss_msg->msg.errno;
596
	spin_unlock(&inode->i_lock);
L
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597 598 599 600
out_intr:
	finish_wait(&gss_msg->waitqueue, &wait);
	gss_release_msg(gss_msg);
out:
601 602
	dprintk("RPC:       gss_create_upcall for uid %u result %d\n",
			cred->cr_uid, err);
L
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603 604 605 606 607 608 609 610
	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;
611 612
	size_t mlen = min(msg->len, buflen);
	unsigned long left;
L
Linus Torvalds 已提交
613 614

	left = copy_to_user(dst, data, mlen);
615 616 617
	if (left == mlen) {
		msg->errno = -EFAULT;
		return -EFAULT;
L
Linus Torvalds 已提交
618
	}
619

L
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620 621 622 623 624 625 626 627 628 629 630 631 632 633
	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 gss_upcall_msg *gss_msg;
634
	struct inode *inode = filp->f_path.dentry->d_inode;
L
Linus Torvalds 已提交
635 636
	struct gss_cl_ctx *ctx;
	uid_t uid;
637
	ssize_t err = -EFBIG;
L
Linus Torvalds 已提交
638 639 640 641

	if (mlen > MSG_BUF_MAXSIZE)
		goto out;
	err = -ENOMEM;
642
	buf = kmalloc(mlen, GFP_NOFS);
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643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660
	if (!buf)
		goto out;

	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;
661 662 663 664

	err = -ENOENT;
	/* Find a matching upcall */
	spin_lock(&inode->i_lock);
665
	gss_msg = __gss_find_upcall(RPC_I(inode), uid);
666 667 668 669 670 671 672
	if (gss_msg == NULL) {
		spin_unlock(&inode->i_lock);
		goto err_put_ctx;
	}
	list_del_init(&gss_msg->list);
	spin_unlock(&inode->i_lock);

673
	p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
L
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674 675
	if (IS_ERR(p)) {
		err = PTR_ERR(p);
676 677
		switch (err) {
		case -EACCES:
678
		case -EKEYEXPIRED:
679 680 681 682 683 684 685 686 687 688 689
			gss_msg->msg.errno = err;
			err = mlen;
			break;
		case -EFAULT:
		case -ENOMEM:
		case -EINVAL:
		case -ENOSYS:
			gss_msg->msg.errno = -EAGAIN;
			break;
		default:
			printk(KERN_CRIT "%s: bad return from "
R
Randy Dunlap 已提交
690
				"gss_fill_context: %zd\n", __func__, err);
691 692
			BUG();
		}
693
		goto err_release_msg;
L
Linus Torvalds 已提交
694
	}
695 696 697 698
	gss_msg->ctx = gss_get_ctx(ctx);
	err = mlen;

err_release_msg:
699
	spin_lock(&inode->i_lock);
700 701 702
	__gss_unhash_msg(gss_msg);
	spin_unlock(&inode->i_lock);
	gss_release_msg(gss_msg);
L
Linus Torvalds 已提交
703 704 705 706 707
err_put_ctx:
	gss_put_ctx(ctx);
err:
	kfree(buf);
out:
708
	dprintk("RPC:       gss_pipe_downcall returning %Zd\n", err);
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709 710 711
	return err;
}

\
\"J. Bruce Fields\ 已提交
712
static int gss_pipe_open(struct inode *inode, int new_version)
713
{
\
\"J. Bruce Fields\ 已提交
714 715
	int ret = 0;

716 717
	spin_lock(&pipe_version_lock);
	if (pipe_version < 0) {
\
\"J. Bruce Fields\ 已提交
718 719
		/* First open of any gss pipe determines the version: */
		pipe_version = new_version;
720 721
		rpc_wake_up(&pipe_version_rpc_waitqueue);
		wake_up(&pipe_version_waitqueue);
\
\"J. Bruce Fields\ 已提交
722 723 724 725
	} else if (pipe_version != new_version) {
		/* Trying to open a pipe of a different version */
		ret = -EBUSY;
		goto out;
726
	}
727
	atomic_inc(&pipe_users);
\
\"J. Bruce Fields\ 已提交
728
out:
729
	spin_unlock(&pipe_version_lock);
\
\"J. Bruce Fields\ 已提交
730 731 732 733 734 735 736 737 738 739 740 741
	return ret;

}

static int gss_pipe_open_v0(struct inode *inode)
{
	return gss_pipe_open(inode, 0);
}

static int gss_pipe_open_v1(struct inode *inode)
{
	return gss_pipe_open(inode, 1);
742 743
}

L
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744 745 746 747
static void
gss_pipe_release(struct inode *inode)
{
	struct rpc_inode *rpci = RPC_I(inode);
748
	struct gss_upcall_msg *gss_msg;
L
Linus Torvalds 已提交
749

750
restart:
751
	spin_lock(&inode->i_lock);
752
	list_for_each_entry(gss_msg, &rpci->in_downcall, list) {
L
Linus Torvalds 已提交
753

754 755
		if (!list_empty(&gss_msg->msg.list))
			continue;
L
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756 757 758
		gss_msg->msg.errno = -EPIPE;
		atomic_inc(&gss_msg->count);
		__gss_unhash_msg(gss_msg);
759
		spin_unlock(&inode->i_lock);
L
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760
		gss_release_msg(gss_msg);
761
		goto restart;
L
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762
	}
763
	spin_unlock(&inode->i_lock);
764

765
	put_pipe_version();
L
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766 767 768 769 770 771 772 773
}

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);

	if (msg->errno < 0) {
774
		dprintk("RPC:       gss_pipe_destroy_msg releasing msg %p\n",
L
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775 776 777
				gss_msg);
		atomic_inc(&gss_msg->count);
		gss_unhash_msg(gss_msg);
778 779
		if (msg->errno == -ETIMEDOUT)
			warn_gssd();
L
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780 781 782 783
		gss_release_msg(gss_msg);
	}
}

784 785
/*
 * NOTE: we have the opportunity to use different
L
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786 787 788 789 790 791 792
 * 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;
793
	int err = -ENOMEM; /* XXX? */
L
Linus Torvalds 已提交
794

795
	dprintk("RPC:       creating GSS authenticator for client %p\n", clnt);
L
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796 797

	if (!try_module_get(THIS_MODULE))
798
		return ERR_PTR(err);
L
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799 800 801
	if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
		goto out_dec;
	gss_auth->client = clnt;
802
	err = -EINVAL;
L
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803 804
	gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
	if (!gss_auth->mech) {
805
		printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n",
806
				__func__, flavor);
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807 808 809
		goto err_free;
	}
	gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
810 811
	if (gss_auth->service == 0)
		goto err_put_mech;
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812 813 814 815 816 817
	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);
818
	kref_init(&gss_auth->kref);
L
Linus Torvalds 已提交
819

\
\"J. Bruce Fields\ 已提交
820 821 822 823 824 825
	/*
	 * Note: if we created the old pipe first, then someone who
	 * examined the directory at the right moment might conclude
	 * that we supported only the old pipe.  So we instead create
	 * the new pipe first.
	 */
826
	gss_auth->dentry[1] = rpc_mkpipe(clnt->cl_path.dentry,
\
\"J. Bruce Fields\ 已提交
827 828 829 830 831
					 "gssd",
					 clnt, &gss_upcall_ops_v1,
					 RPC_PIPE_WAIT_FOR_OPEN);
	if (IS_ERR(gss_auth->dentry[1])) {
		err = PTR_ERR(gss_auth->dentry[1]);
L
Linus Torvalds 已提交
832
		goto err_put_mech;
833
	}
L
Linus Torvalds 已提交
834

835
	gss_auth->dentry[0] = rpc_mkpipe(clnt->cl_path.dentry,
\
\"J. Bruce Fields\ 已提交
836 837 838 839 840 841 842
					 gss_auth->mech->gm_name,
					 clnt, &gss_upcall_ops_v0,
					 RPC_PIPE_WAIT_FOR_OPEN);
	if (IS_ERR(gss_auth->dentry[0])) {
		err = PTR_ERR(gss_auth->dentry[0]);
		goto err_unlink_pipe_1;
	}
843
	err = rpcauth_init_credcache(auth);
844
	if (err)
\
\"J. Bruce Fields\ 已提交
845
		goto err_unlink_pipe_0;
846

L
Linus Torvalds 已提交
847
	return auth;
\
\"J. Bruce Fields\ 已提交
848 849 850 851
err_unlink_pipe_0:
	rpc_unlink(gss_auth->dentry[0]);
err_unlink_pipe_1:
	rpc_unlink(gss_auth->dentry[1]);
L
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852 853 854 855 856 857
err_put_mech:
	gss_mech_put(gss_auth->mech);
err_free:
	kfree(gss_auth);
out_dec:
	module_put(THIS_MODULE);
858
	return ERR_PTR(err);
L
Linus Torvalds 已提交
859 860
}

861 862 863
static void
gss_free(struct gss_auth *gss_auth)
{
\
\"J. Bruce Fields\ 已提交
864 865
	rpc_unlink(gss_auth->dentry[1]);
	rpc_unlink(gss_auth->dentry[0]);
866 867 868 869 870 871 872 873 874 875 876 877 878 879
	gss_mech_put(gss_auth->mech);

	kfree(gss_auth);
	module_put(THIS_MODULE);
}

static void
gss_free_callback(struct kref *kref)
{
	struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref);

	gss_free(gss_auth);
}

L
Linus Torvalds 已提交
880 881 882 883 884
static void
gss_destroy(struct rpc_auth *auth)
{
	struct gss_auth *gss_auth;

885 886
	dprintk("RPC:       destroying GSS authenticator %p flavor %d\n",
			auth, auth->au_flavor);
L
Linus Torvalds 已提交
887

888 889
	rpcauth_destroy_credcache(auth);

L
Linus Torvalds 已提交
890
	gss_auth = container_of(auth, struct gss_auth, rpc_auth);
891
	kref_put(&gss_auth->kref, gss_free_callback);
L
Linus Torvalds 已提交
892 893
}

894 895 896 897 898 899 900 901 902 903 904 905 906 907
/*
 * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call
 * to the server with the GSS control procedure field set to
 * RPC_GSS_PROC_DESTROY. This should normally cause the server to release
 * all RPCSEC_GSS state associated with that context.
 */
static int
gss_destroying_context(struct rpc_cred *cred)
{
	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
	struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
	struct rpc_task *task;

	if (gss_cred->gc_ctx == NULL ||
908
	    test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
909 910 911 912 913 914 915 916 917
		return 0;

	gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY;
	cred->cr_ops = &gss_nullops;

	/* Take a reference to ensure the cred will be destroyed either
	 * by the RPC call or by the put_rpccred() below */
	get_rpccred(cred);

918
	task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT);
919 920 921 922 923 924 925 926
	if (!IS_ERR(task))
		rpc_put_task(task);

	put_rpccred(cred);
	return 1;
}

/* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure
L
Linus Torvalds 已提交
927 928 929
 * to create a new cred or context, so they check that things have been
 * allocated before freeing them. */
static void
930
gss_do_free_ctx(struct gss_cl_ctx *ctx)
L
Linus Torvalds 已提交
931
{
932
	dprintk("RPC:       gss_free_ctx\n");
L
Linus Torvalds 已提交
933

934
	gss_delete_sec_context(&ctx->gc_gss_ctx);
L
Linus Torvalds 已提交
935 936 937 938
	kfree(ctx->gc_wire_ctx.data);
	kfree(ctx);
}

939 940 941 942 943 944 945 946 947 948 949 950 951
static void
gss_free_ctx_callback(struct rcu_head *head)
{
	struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu);
	gss_do_free_ctx(ctx);
}

static void
gss_free_ctx(struct gss_cl_ctx *ctx)
{
	call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
}

L
Linus Torvalds 已提交
952
static void
953
gss_free_cred(struct gss_cred *gss_cred)
L
Linus Torvalds 已提交
954
{
955 956 957
	dprintk("RPC:       gss_free_cred %p\n", gss_cred);
	kfree(gss_cred);
}
L
Linus Torvalds 已提交
958

959 960 961 962 963 964
static void
gss_free_cred_callback(struct rcu_head *head)
{
	struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu);
	gss_free_cred(gss_cred);
}
L
Linus Torvalds 已提交
965

966
static void
967
gss_destroy_nullcred(struct rpc_cred *cred)
968
{
969
	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
970
	struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
971 972 973
	struct gss_cl_ctx *ctx = gss_cred->gc_ctx;

	rcu_assign_pointer(gss_cred->gc_ctx, NULL);
974
	call_rcu(&cred->cr_rcu, gss_free_cred_callback);
975 976
	if (ctx)
		gss_put_ctx(ctx);
977
	kref_put(&gss_auth->kref, gss_free_callback);
L
Linus Torvalds 已提交
978 979
}

980 981 982 983 984 985 986 987 988
static void
gss_destroy_cred(struct rpc_cred *cred)
{

	if (gss_destroying_context(cred))
		return;
	gss_destroy_nullcred(cred);
}

L
Linus Torvalds 已提交
989 990 991 992
/*
 * Lookup RPCSEC_GSS cred for the current process
 */
static struct rpc_cred *
993
gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
L
Linus Torvalds 已提交
994
{
995
	return rpcauth_lookup_credcache(auth, acred, flags);
L
Linus Torvalds 已提交
996 997 998
}

static struct rpc_cred *
999
gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
L
Linus Torvalds 已提交
1000 1001 1002 1003 1004
{
	struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
	struct gss_cred	*cred = NULL;
	int err = -ENOMEM;

1005
	dprintk("RPC:       gss_create_cred for uid %d, flavor %d\n",
L
Linus Torvalds 已提交
1006 1007
		acred->uid, auth->au_flavor);

1008
	if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS)))
L
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1009 1010
		goto out_err;

1011
	rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops);
L
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1012 1013 1014 1015
	/*
	 * Note: in order to force a call to call_refresh(), we deliberately
	 * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
	 */
1016
	cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
L
Linus Torvalds 已提交
1017
	cred->gc_service = gss_auth->service;
1018
	cred->gc_machine_cred = acred->machine_cred;
1019
	kref_get(&gss_auth->kref);
L
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1020 1021 1022
	return &cred->gc_base;

out_err:
1023
	dprintk("RPC:       gss_create_cred failed with error %d\n", err);
L
Linus Torvalds 已提交
1024 1025 1026
	return ERR_PTR(err);
}

1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039
static int
gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred)
{
	struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
	struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base);
	int err;

	do {
		err = gss_create_upcall(gss_auth, gss_cred);
	} while (err == -EAGAIN);
	return err;
}

L
Linus Torvalds 已提交
1040
static int
1041
gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
L
Linus Torvalds 已提交
1042 1043 1044
{
	struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);

1045
	if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
1046
		goto out;
L
Linus Torvalds 已提交
1047
	/* Don't match with creds that have expired. */
1048 1049 1050
	if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry))
		return 0;
	if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
L
Linus Torvalds 已提交
1051
		return 0;
1052
out:
1053 1054
	if (acred->machine_cred != gss_cred->gc_machine_cred)
		return 0;
E
Eric Dumazet 已提交
1055
	return rc->cr_uid == acred->uid;
L
Linus Torvalds 已提交
1056 1057 1058 1059 1060 1061
}

/*
* Marshal credentials.
* Maybe we should keep a cached credential for performance reasons.
*/
1062 1063
static __be32 *
gss_marshal(struct rpc_task *task, __be32 *p)
L
Linus Torvalds 已提交
1064
{
1065 1066
	struct rpc_rqst *req = task->tk_rqstp;
	struct rpc_cred *cred = req->rq_cred;
L
Linus Torvalds 已提交
1067 1068 1069
	struct gss_cred	*gss_cred = container_of(cred, struct gss_cred,
						 gc_base);
	struct gss_cl_ctx	*ctx = gss_cred_get_ctx(cred);
1070
	__be32		*cred_len;
L
Linus Torvalds 已提交
1071 1072 1073 1074 1075
	u32             maj_stat = 0;
	struct xdr_netobj mic;
	struct kvec	iov;
	struct xdr_buf	verf_buf;

1076
	dprintk("RPC: %5u gss_marshal\n", task->tk_pid);
L
Linus Torvalds 已提交
1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093

	*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: */
1094 1095
	iov.iov_base = xprt_skip_transport_header(task->tk_xprt,
					req->rq_snd_buf.head[0].iov_base);
L
Linus Torvalds 已提交
1096 1097 1098 1099 1100 1101 1102
	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);
1103
	maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
L
Linus Torvalds 已提交
1104
	if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
1105
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
L
Linus Torvalds 已提交
1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117
	} 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;
}

1118 1119
static int gss_renew_cred(struct rpc_task *task)
{
1120
	struct rpc_cred *oldcred = task->tk_rqstp->rq_cred;
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133
	struct gss_cred *gss_cred = container_of(oldcred,
						 struct gss_cred,
						 gc_base);
	struct rpc_auth *auth = oldcred->cr_auth;
	struct auth_cred acred = {
		.uid = oldcred->cr_uid,
		.machine_cred = gss_cred->gc_machine_cred,
	};
	struct rpc_cred *new;

	new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
	if (IS_ERR(new))
		return PTR_ERR(new);
1134
	task->tk_rqstp->rq_cred = new;
1135 1136 1137 1138
	put_rpccred(oldcred);
	return 0;
}

1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155
static int gss_cred_is_negative_entry(struct rpc_cred *cred)
{
	if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) {
		unsigned long now = jiffies;
		unsigned long begin, expire;
		struct gss_cred *gss_cred; 

		gss_cred = container_of(cred, struct gss_cred, gc_base);
		begin = gss_cred->gc_upcall_timestamp;
		expire = begin + gss_expired_cred_retry_delay * HZ;

		if (time_in_range_open(now, begin, expire))
			return 1;
	}
	return 0;
}

L
Linus Torvalds 已提交
1156 1157 1158 1159 1160 1161
/*
* Refresh credentials. XXX - finish
*/
static int
gss_refresh(struct rpc_task *task)
{
1162
	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1163 1164
	int ret = 0;

1165 1166 1167
	if (gss_cred_is_negative_entry(cred))
		return -EKEYEXPIRED;

1168 1169 1170 1171 1172
	if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
			!test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) {
		ret = gss_renew_cred(task);
		if (ret < 0)
			goto out;
1173
		cred = task->tk_rqstp->rq_cred;
1174
	}
L
Linus Torvalds 已提交
1175

1176 1177 1178 1179
	if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
		ret = gss_refresh_upcall(task);
out:
	return ret;
L
Linus Torvalds 已提交
1180 1181
}

1182 1183 1184 1185 1186 1187 1188
/* Dummy refresh routine: used only when destroying the context */
static int
gss_refresh_null(struct rpc_task *task)
{
	return -EACCES;
}

1189 1190
static __be32 *
gss_validate(struct rpc_task *task, __be32 *p)
L
Linus Torvalds 已提交
1191
{
1192
	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
L
Linus Torvalds 已提交
1193
	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1194
	__be32		seq;
L
Linus Torvalds 已提交
1195 1196 1197 1198 1199 1200
	struct kvec	iov;
	struct xdr_buf	verf_buf;
	struct xdr_netobj mic;
	u32		flav,len;
	u32		maj_stat;

1201
	dprintk("RPC: %5u gss_validate\n", task->tk_pid);
L
Linus Torvalds 已提交
1202 1203 1204

	flav = ntohl(*p++);
	if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
1205
		goto out_bad;
L
Linus Torvalds 已提交
1206 1207 1208 1209 1210 1211 1212 1213 1214
	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;

1215
	maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
L
Linus Torvalds 已提交
1216
	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1217
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1218
	if (maj_stat) {
1219
		dprintk("RPC: %5u gss_validate: gss_verify_mic returned "
1220
				"error 0x%08x\n", task->tk_pid, maj_stat);
L
Linus Torvalds 已提交
1221
		goto out_bad;
1222
	}
1223 1224
	/* We leave it to unwrap to calculate au_rslack. For now we just
	 * calculate the length of the verifier: */
1225
	cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
L
Linus Torvalds 已提交
1226
	gss_put_ctx(ctx);
1227
	dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n",
L
Linus Torvalds 已提交
1228 1229 1230 1231
			task->tk_pid);
	return p + XDR_QUADLEN(len);
out_bad:
	gss_put_ctx(ctx);
1232
	dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid);
L
Linus Torvalds 已提交
1233 1234 1235
	return NULL;
}

1236 1237 1238 1239 1240 1241 1242 1243 1244
static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp,
				__be32 *p, void *obj)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p);
	encode(rqstp, &xdr, obj);
}

L
Linus Torvalds 已提交
1245 1246
static inline int
gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1247 1248
		   kxdreproc_t encode, struct rpc_rqst *rqstp,
		   __be32 *p, void *obj)
L
Linus Torvalds 已提交
1249 1250 1251
{
	struct xdr_buf	*snd_buf = &rqstp->rq_snd_buf;
	struct xdr_buf	integ_buf;
1252
	__be32          *integ_len = NULL;
L
Linus Torvalds 已提交
1253
	struct xdr_netobj mic;
1254 1255
	u32		offset;
	__be32		*q;
L
Linus Torvalds 已提交
1256 1257 1258 1259 1260 1261 1262 1263
	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);

1264
	gss_wrap_req_encode(encode, rqstp, p, obj);
L
Linus Torvalds 已提交
1265 1266 1267 1268 1269 1270 1271

	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: */
1272
	if (snd_buf->page_len || snd_buf->tail[0].iov_len)
L
Linus Torvalds 已提交
1273 1274 1275 1276 1277 1278
		iov = snd_buf->tail;
	else
		iov = snd_buf->head;
	p = iov->iov_base + iov->iov_len;
	mic.data = (u8 *)(p + 1);

1279
	maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
L
Linus Torvalds 已提交
1280 1281
	status = -EIO; /* XXX? */
	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1282
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
L
Linus Torvalds 已提交
1283 1284 1285 1286 1287 1288 1289 1290 1291 1292
	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;
}

1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329
static void
priv_release_snd_buf(struct rpc_rqst *rqstp)
{
	int i;

	for (i=0; i < rqstp->rq_enc_pages_num; i++)
		__free_page(rqstp->rq_enc_pages[i]);
	kfree(rqstp->rq_enc_pages);
}

static int
alloc_enc_pages(struct rpc_rqst *rqstp)
{
	struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
	int first, last, i;

	if (snd_buf->page_len == 0) {
		rqstp->rq_enc_pages_num = 0;
		return 0;
	}

	first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
	last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT;
	rqstp->rq_enc_pages_num = last - first + 1 + 1;
	rqstp->rq_enc_pages
		= kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *),
				GFP_NOFS);
	if (!rqstp->rq_enc_pages)
		goto out;
	for (i=0; i < rqstp->rq_enc_pages_num; i++) {
		rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS);
		if (rqstp->rq_enc_pages[i] == NULL)
			goto out_free;
	}
	rqstp->rq_release_snd_buf = priv_release_snd_buf;
	return 0;
out_free:
1330 1331
	rqstp->rq_enc_pages_num = i;
	priv_release_snd_buf(rqstp);
1332 1333 1334 1335 1336 1337
out:
	return -EAGAIN;
}

static inline int
gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1338 1339
		  kxdreproc_t encode, struct rpc_rqst *rqstp,
		  __be32 *p, void *obj)
1340 1341 1342 1343 1344
{
	struct xdr_buf	*snd_buf = &rqstp->rq_snd_buf;
	u32		offset;
	u32             maj_stat;
	int		status;
1345
	__be32		*opaque_len;
1346 1347 1348 1349 1350 1351 1352 1353 1354 1355
	struct page	**inpages;
	int		first;
	int		pad;
	struct kvec	*iov;
	char		*tmp;

	opaque_len = p++;
	offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
	*p++ = htonl(rqstp->rq_seqno);

1356
	gss_wrap_req_encode(encode, rqstp, p, obj);
1357 1358 1359 1360 1361 1362 1363 1364

	status = alloc_enc_pages(rqstp);
	if (status)
		return status;
	first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
	inpages = snd_buf->pages + first;
	snd_buf->pages = rqstp->rq_enc_pages;
	snd_buf->page_base -= first << PAGE_CACHE_SHIFT;
1365 1366 1367 1368 1369 1370 1371 1372
	/*
	 * Give the tail its own page, in case we need extra space in the
	 * head when wrapping:
	 *
	 * call_allocate() allocates twice the slack space required
	 * by the authentication flavor to rq_callsize.
	 * For GSS, slack is GSS_CRED_SLACK.
	 */
1373 1374 1375 1376 1377
	if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
		tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]);
		memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len);
		snd_buf->tail[0].iov_base = tmp;
	}
1378
	maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
1379
	/* slack space should prevent this ever happening: */
1380
	BUG_ON(snd_buf->len > snd_buf->buflen);
1381
	status = -EIO;
1382 1383 1384
	/* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was
	 * done anyway, so it's safe to put the request on the wire: */
	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1385
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403
	else if (maj_stat)
		return status;

	*opaque_len = htonl(snd_buf->len - offset);
	/* 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;
	pad = 3 - ((snd_buf->len - offset - 1) & 3);
	memset(p, 0, pad);
	iov->iov_len += pad;
	snd_buf->len += pad;

	return 0;
}

L
Linus Torvalds 已提交
1404 1405
static int
gss_wrap_req(struct rpc_task *task,
1406
	     kxdreproc_t encode, void *rqstp, __be32 *p, void *obj)
L
Linus Torvalds 已提交
1407
{
1408
	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
L
Linus Torvalds 已提交
1409 1410 1411 1412 1413
	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;

1414
	dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid);
L
Linus Torvalds 已提交
1415 1416 1417 1418
	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.
		 */
1419 1420
		gss_wrap_req_encode(encode, rqstp, p, obj);
		status = 0;
L
Linus Torvalds 已提交
1421 1422 1423 1424
		goto out;
	}
	switch (gss_cred->gc_service) {
		case RPC_GSS_SVC_NONE:
1425 1426
			gss_wrap_req_encode(encode, rqstp, p, obj);
			status = 0;
L
Linus Torvalds 已提交
1427 1428 1429 1430 1431
			break;
		case RPC_GSS_SVC_INTEGRITY:
			status = gss_wrap_req_integ(cred, ctx, encode,
								rqstp, p, obj);
			break;
1432
		case RPC_GSS_SVC_PRIVACY:
1433 1434
			status = gss_wrap_req_priv(cred, ctx, encode,
					rqstp, p, obj);
L
Linus Torvalds 已提交
1435 1436 1437 1438
			break;
	}
out:
	gss_put_ctx(ctx);
1439
	dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status);
L
Linus Torvalds 已提交
1440 1441 1442 1443 1444
	return status;
}

static inline int
gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1445
		struct rpc_rqst *rqstp, __be32 **p)
L
Linus Torvalds 已提交
1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471
{
	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;

1472
	maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
L
Linus Torvalds 已提交
1473
	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1474
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
L
Linus Torvalds 已提交
1475 1476 1477 1478 1479
	if (maj_stat != GSS_S_COMPLETE)
		return status;
	return 0;
}

1480 1481
static inline int
gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1482
		struct rpc_rqst *rqstp, __be32 **p)
1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496
{
	struct xdr_buf  *rcv_buf = &rqstp->rq_rcv_buf;
	u32 offset;
	u32 opaque_len;
	u32 maj_stat;
	int status = -EIO;

	opaque_len = ntohl(*(*p)++);
	offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
	if (offset + opaque_len > rcv_buf->len)
		return status;
	/* remove padding: */
	rcv_buf->len = offset + opaque_len;

1497
	maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
1498
	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1499
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1500 1501 1502 1503 1504 1505 1506 1507
	if (maj_stat != GSS_S_COMPLETE)
		return status;
	if (ntohl(*(*p)++) != rqstp->rq_seqno)
		return status;

	return 0;
}

1508 1509 1510 1511 1512 1513 1514 1515 1516
static int
gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp,
		      __be32 *p, void *obj)
{
	struct xdr_stream xdr;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	return decode(rqstp, &xdr, obj);
}
1517

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static int
gss_unwrap_resp(struct rpc_task *task,
1520
		kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj)
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{
1522
	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
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	struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
			gc_base);
	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1526
	__be32		*savedp = p;
1527 1528
	struct kvec	*head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head;
	int		savedlen = head->iov_len;
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	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;
1541
		case RPC_GSS_SVC_PRIVACY:
1542 1543 1544
			status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p);
			if (status)
				goto out;
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			break;
	}
1547
	/* take into account extra slack for integrity and privacy cases: */
1548
	cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp)
1549
						+ (savedlen - head->iov_len);
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out_decode:
1551
	status = gss_unwrap_req_decode(decode, rqstp, p, obj);
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out:
	gss_put_ctx(ctx);
1554
	dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid,
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			status);
	return status;
}
1558

1559
static const struct rpc_authops authgss_ops = {
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	.owner		= THIS_MODULE,
	.au_flavor	= RPC_AUTH_GSS,
	.au_name	= "RPCSEC_GSS",
	.create		= gss_create,
	.destroy	= gss_destroy,
	.lookup_cred	= gss_lookup_cred,
	.crcreate	= gss_create_cred
};

1569
static const struct rpc_credops gss_credops = {
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	.cr_name	= "AUTH_GSS",
	.crdestroy	= gss_destroy_cred,
1572
	.cr_init	= gss_cred_init,
1573
	.crbind		= rpcauth_generic_bind_cred,
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	.crmatch	= gss_match,
	.crmarshal	= gss_marshal,
	.crrefresh	= gss_refresh,
	.crvalidate	= gss_validate,
	.crwrap_req	= gss_wrap_req,
	.crunwrap_resp	= gss_unwrap_resp,
};

1582 1583
static const struct rpc_credops gss_nullops = {
	.cr_name	= "AUTH_GSS",
1584
	.crdestroy	= gss_destroy_nullcred,
1585
	.crbind		= rpcauth_generic_bind_cred,
1586 1587 1588 1589 1590 1591 1592 1593
	.crmatch	= gss_match,
	.crmarshal	= gss_marshal,
	.crrefresh	= gss_refresh_null,
	.crvalidate	= gss_validate,
	.crwrap_req	= gss_wrap_req,
	.crunwrap_resp	= gss_unwrap_resp,
};

1594
static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
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	.upcall		= gss_pipe_upcall,
	.downcall	= gss_pipe_downcall,
	.destroy_msg	= gss_pipe_destroy_msg,
	.open_pipe	= gss_pipe_open_v0,
	.release_pipe	= gss_pipe_release,
};

1602
static const struct rpc_pipe_ops gss_upcall_ops_v1 = {
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	.upcall		= gss_pipe_upcall,
	.downcall	= gss_pipe_downcall,
	.destroy_msg	= gss_pipe_destroy_msg,
\
\"J. Bruce Fields\ 已提交
1606
	.open_pipe	= gss_pipe_open_v1,
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	.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;
1623
	rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version");
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	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);
1635
	rcu_barrier(); /* Wait for completion of call_rcu()'s */
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}

MODULE_LICENSE("GPL");
1639 1640 1641 1642 1643 1644
module_param_named(expired_cred_retry_delay,
		   gss_expired_cred_retry_delay,
		   uint, 0644);
MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until "
		"the RPC engine retries an expired credential");

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module_init(init_rpcsec_gss)
module_exit(exit_rpcsec_gss)