auth_gss.c 41.7 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) {
		len = sprintf(p, mech->gm_upcall_enctypes);
		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);
		return 0;
	}
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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);
563 564 565 566 567 568 569 570 571
	if (PTR_ERR(gss_msg) == -EAGAIN) {
		err = wait_event_interruptible_timeout(pipe_version_waitqueue,
				pipe_version >= 0, 15*HZ);
		if (err)
			goto out;
		if (pipe_version < 0)
			warn_gssd();
		goto retry;
	}
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572 573 574 575
	if (IS_ERR(gss_msg)) {
		err = PTR_ERR(gss_msg);
		goto out;
	}
576
	inode = &gss_msg->inode->vfs_inode;
L
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	for (;;) {
		prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE);
579
		spin_lock(&inode->i_lock);
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580 581 582
		if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
			break;
		}
583
		spin_unlock(&inode->i_lock);
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584 585 586 587 588 589 590
		if (signalled()) {
			err = -ERESTARTSYS;
			goto out_intr;
		}
		schedule();
	}
	if (gss_msg->ctx)
591
		gss_cred_set_ctx(cred, gss_msg->ctx);
L
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592 593
	else
		err = gss_msg->msg.errno;
594
	spin_unlock(&inode->i_lock);
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out_intr:
	finish_wait(&gss_msg->waitqueue, &wait);
	gss_release_msg(gss_msg);
out:
599 600
	dprintk("RPC:       gss_create_upcall for uid %u result %d\n",
			cred->cr_uid, err);
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601 602 603 604 605 606 607 608
	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;
609 610
	size_t mlen = min(msg->len, buflen);
	unsigned long left;
L
Linus Torvalds 已提交
611 612

	left = copy_to_user(dst, data, mlen);
613 614 615
	if (left == mlen) {
		msg->errno = -EFAULT;
		return -EFAULT;
L
Linus Torvalds 已提交
616
	}
617

L
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618 619 620 621 622 623 624 625 626 627 628 629 630 631
	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;
632
	struct inode *inode = filp->f_path.dentry->d_inode;
L
Linus Torvalds 已提交
633 634
	struct gss_cl_ctx *ctx;
	uid_t uid;
635
	ssize_t err = -EFBIG;
L
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636 637 638 639

	if (mlen > MSG_BUF_MAXSIZE)
		goto out;
	err = -ENOMEM;
640
	buf = kmalloc(mlen, GFP_NOFS);
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641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658
	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;
659 660 661 662

	err = -ENOENT;
	/* Find a matching upcall */
	spin_lock(&inode->i_lock);
663
	gss_msg = __gss_find_upcall(RPC_I(inode), uid);
664 665 666 667 668 669 670
	if (gss_msg == NULL) {
		spin_unlock(&inode->i_lock);
		goto err_put_ctx;
	}
	list_del_init(&gss_msg->list);
	spin_unlock(&inode->i_lock);

671
	p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
L
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672 673
	if (IS_ERR(p)) {
		err = PTR_ERR(p);
674 675
		switch (err) {
		case -EACCES:
676
		case -EKEYEXPIRED:
677 678 679 680 681 682 683 684 685 686 687
			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
688
				"gss_fill_context: %zd\n", __func__, err);
689 690
			BUG();
		}
691
		goto err_release_msg;
L
Linus Torvalds 已提交
692
	}
693 694 695 696
	gss_msg->ctx = gss_get_ctx(ctx);
	err = mlen;

err_release_msg:
697
	spin_lock(&inode->i_lock);
698 699 700
	__gss_unhash_msg(gss_msg);
	spin_unlock(&inode->i_lock);
	gss_release_msg(gss_msg);
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701 702 703 704 705
err_put_ctx:
	gss_put_ctx(ctx);
err:
	kfree(buf);
out:
706
	dprintk("RPC:       gss_pipe_downcall returning %Zd\n", err);
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707 708 709
	return err;
}

\
\"J. Bruce Fields\ 已提交
710
static int gss_pipe_open(struct inode *inode, int new_version)
711
{
\
\"J. Bruce Fields\ 已提交
712 713
	int ret = 0;

714 715
	spin_lock(&pipe_version_lock);
	if (pipe_version < 0) {
\
\"J. Bruce Fields\ 已提交
716 717
		/* First open of any gss pipe determines the version: */
		pipe_version = new_version;
718 719
		rpc_wake_up(&pipe_version_rpc_waitqueue);
		wake_up(&pipe_version_waitqueue);
\
\"J. Bruce Fields\ 已提交
720 721 722 723
	} else if (pipe_version != new_version) {
		/* Trying to open a pipe of a different version */
		ret = -EBUSY;
		goto out;
724
	}
725
	atomic_inc(&pipe_users);
\
\"J. Bruce Fields\ 已提交
726
out:
727
	spin_unlock(&pipe_version_lock);
\
\"J. Bruce Fields\ 已提交
728 729 730 731 732 733 734 735 736 737 738 739
	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);
740 741
}

L
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742 743 744 745
static void
gss_pipe_release(struct inode *inode)
{
	struct rpc_inode *rpci = RPC_I(inode);
746
	struct gss_upcall_msg *gss_msg;
L
Linus Torvalds 已提交
747

748
	spin_lock(&inode->i_lock);
749
	while (!list_empty(&rpci->in_downcall)) {
L
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750

751
		gss_msg = list_entry(rpci->in_downcall.next,
L
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752 753 754 755
				struct gss_upcall_msg, list);
		gss_msg->msg.errno = -EPIPE;
		atomic_inc(&gss_msg->count);
		__gss_unhash_msg(gss_msg);
756
		spin_unlock(&inode->i_lock);
L
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757
		gss_release_msg(gss_msg);
758
		spin_lock(&inode->i_lock);
L
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759
	}
760
	spin_unlock(&inode->i_lock);
761

762
	put_pipe_version();
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763 764 765 766 767 768 769 770
}

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) {
771
		dprintk("RPC:       gss_pipe_destroy_msg releasing msg %p\n",
L
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772 773 774
				gss_msg);
		atomic_inc(&gss_msg->count);
		gss_unhash_msg(gss_msg);
775 776
		if (msg->errno == -ETIMEDOUT)
			warn_gssd();
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		gss_release_msg(gss_msg);
	}
}

781 782
/*
 * NOTE: we have the opportunity to use different
L
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 * 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;
790
	int err = -ENOMEM; /* XXX? */
L
Linus Torvalds 已提交
791

792
	dprintk("RPC:       creating GSS authenticator for client %p\n", clnt);
L
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793 794

	if (!try_module_get(THIS_MODULE))
795
		return ERR_PTR(err);
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796 797 798
	if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
		goto out_dec;
	gss_auth->client = clnt;
799
	err = -EINVAL;
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800 801
	gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
	if (!gss_auth->mech) {
802
		printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n",
803
				__func__, flavor);
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		goto err_free;
	}
	gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
807 808
	if (gss_auth->service == 0)
		goto err_put_mech;
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809 810 811 812 813 814
	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);
815
	kref_init(&gss_auth->kref);
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Linus Torvalds 已提交
816

\
\"J. Bruce Fields\ 已提交
817 818 819 820 821 822
	/*
	 * 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.
	 */
823
	gss_auth->dentry[1] = rpc_mkpipe(clnt->cl_path.dentry,
\
\"J. Bruce Fields\ 已提交
824 825 826 827 828
					 "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
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829
		goto err_put_mech;
830
	}
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Linus Torvalds 已提交
831

832
	gss_auth->dentry[0] = rpc_mkpipe(clnt->cl_path.dentry,
\
\"J. Bruce Fields\ 已提交
833 834 835 836 837 838 839
					 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;
	}
840
	err = rpcauth_init_credcache(auth);
841
	if (err)
\
\"J. Bruce Fields\ 已提交
842
		goto err_unlink_pipe_0;
843

L
Linus Torvalds 已提交
844
	return auth;
\
\"J. Bruce Fields\ 已提交
845 846 847 848
err_unlink_pipe_0:
	rpc_unlink(gss_auth->dentry[0]);
err_unlink_pipe_1:
	rpc_unlink(gss_auth->dentry[1]);
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849 850 851 852 853 854
err_put_mech:
	gss_mech_put(gss_auth->mech);
err_free:
	kfree(gss_auth);
out_dec:
	module_put(THIS_MODULE);
855
	return ERR_PTR(err);
L
Linus Torvalds 已提交
856 857
}

858 859 860
static void
gss_free(struct gss_auth *gss_auth)
{
\
\"J. Bruce Fields\ 已提交
861 862
	rpc_unlink(gss_auth->dentry[1]);
	rpc_unlink(gss_auth->dentry[0]);
863 864 865 866 867 868 869 870 871 872 873 874 875 876
	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
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877 878 879 880 881
static void
gss_destroy(struct rpc_auth *auth)
{
	struct gss_auth *gss_auth;

882 883
	dprintk("RPC:       destroying GSS authenticator %p flavor %d\n",
			auth, auth->au_flavor);
L
Linus Torvalds 已提交
884

885 886
	rpcauth_destroy_credcache(auth);

L
Linus Torvalds 已提交
887
	gss_auth = container_of(auth, struct gss_auth, rpc_auth);
888
	kref_put(&gss_auth->kref, gss_free_callback);
L
Linus Torvalds 已提交
889 890
}

891 892 893 894 895 896 897 898 899 900 901 902 903 904
/*
 * 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 ||
905
	    test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
906 907 908 909 910 911 912 913 914
		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);

915
	task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT);
916 917 918 919 920 921 922 923
	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
924 925 926
 * to create a new cred or context, so they check that things have been
 * allocated before freeing them. */
static void
927
gss_do_free_ctx(struct gss_cl_ctx *ctx)
L
Linus Torvalds 已提交
928
{
929
	dprintk("RPC:       gss_free_ctx\n");
L
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930

931
	gss_delete_sec_context(&ctx->gc_gss_ctx);
L
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932 933 934 935
	kfree(ctx->gc_wire_ctx.data);
	kfree(ctx);
}

936 937 938 939 940 941 942 943 944 945 946 947 948
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
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949
static void
950
gss_free_cred(struct gss_cred *gss_cred)
L
Linus Torvalds 已提交
951
{
952 953 954
	dprintk("RPC:       gss_free_cred %p\n", gss_cred);
	kfree(gss_cred);
}
L
Linus Torvalds 已提交
955

956 957 958 959 960 961
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
962

963
static void
964
gss_destroy_nullcred(struct rpc_cred *cred)
965
{
966
	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
967
	struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
968 969 970
	struct gss_cl_ctx *ctx = gss_cred->gc_ctx;

	rcu_assign_pointer(gss_cred->gc_ctx, NULL);
971
	call_rcu(&cred->cr_rcu, gss_free_cred_callback);
972 973
	if (ctx)
		gss_put_ctx(ctx);
974
	kref_put(&gss_auth->kref, gss_free_callback);
L
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975 976
}

977 978 979 980 981 982 983 984 985
static void
gss_destroy_cred(struct rpc_cred *cred)
{

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

L
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986 987 988 989
/*
 * Lookup RPCSEC_GSS cred for the current process
 */
static struct rpc_cred *
990
gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
L
Linus Torvalds 已提交
991
{
992
	return rpcauth_lookup_credcache(auth, acred, flags);
L
Linus Torvalds 已提交
993 994 995
}

static struct rpc_cred *
996
gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
L
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997 998 999 1000 1001
{
	struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
	struct gss_cred	*cred = NULL;
	int err = -ENOMEM;

1002
	dprintk("RPC:       gss_create_cred for uid %d, flavor %d\n",
L
Linus Torvalds 已提交
1003 1004
		acred->uid, auth->au_flavor);

1005
	if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS)))
L
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1006 1007
		goto out_err;

1008
	rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops);
L
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1009 1010 1011 1012
	/*
	 * Note: in order to force a call to call_refresh(), we deliberately
	 * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
	 */
1013
	cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
L
Linus Torvalds 已提交
1014
	cred->gc_service = gss_auth->service;
1015
	cred->gc_machine_cred = acred->machine_cred;
1016
	kref_get(&gss_auth->kref);
L
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1017 1018 1019
	return &cred->gc_base;

out_err:
1020
	dprintk("RPC:       gss_create_cred failed with error %d\n", err);
L
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1021 1022 1023
	return ERR_PTR(err);
}

1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
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;
}

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static int
1038
gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
L
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{
	struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);

1042
	if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
1043
		goto out;
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	/* Don't match with creds that have expired. */
1045 1046 1047
	if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry))
		return 0;
	if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
L
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		return 0;
1049
out:
1050 1051
	if (acred->machine_cred != gss_cred->gc_machine_cred)
		return 0;
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	return (rc->cr_uid == acred->uid);
}

/*
* Marshal credentials.
* Maybe we should keep a cached credential for performance reasons.
*/
1059 1060
static __be32 *
gss_marshal(struct rpc_task *task, __be32 *p)
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{
1062 1063
	struct rpc_rqst *req = task->tk_rqstp;
	struct rpc_cred *cred = req->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);
1067
	__be32		*cred_len;
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	u32             maj_stat = 0;
	struct xdr_netobj mic;
	struct kvec	iov;
	struct xdr_buf	verf_buf;

1073
	dprintk("RPC: %5u gss_marshal\n", task->tk_pid);
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	*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: */
1091 1092
	iov.iov_base = xprt_skip_transport_header(task->tk_xprt,
					req->rq_snd_buf.head[0].iov_base);
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	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);
1100
	maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
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	if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
1102
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
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	} 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;
}

1115 1116
static int gss_renew_cred(struct rpc_task *task)
{
1117
	struct rpc_cred *oldcred = task->tk_rqstp->rq_cred;
1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130
	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);
1131
	task->tk_rqstp->rq_cred = new;
1132 1133 1134 1135
	put_rpccred(oldcred);
	return 0;
}

1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152
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;
}

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/*
* Refresh credentials. XXX - finish
*/
static int
gss_refresh(struct rpc_task *task)
{
1159
	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1160 1161
	int ret = 0;

1162 1163 1164
	if (gss_cred_is_negative_entry(cred))
		return -EKEYEXPIRED;

1165 1166 1167 1168 1169
	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;
1170
		cred = task->tk_rqstp->rq_cred;
1171
	}
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1172

1173 1174 1175 1176
	if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
		ret = gss_refresh_upcall(task);
out:
	return ret;
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}

1179 1180 1181 1182 1183 1184 1185
/* Dummy refresh routine: used only when destroying the context */
static int
gss_refresh_null(struct rpc_task *task)
{
	return -EACCES;
}

1186 1187
static __be32 *
gss_validate(struct rpc_task *task, __be32 *p)
L
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1188
{
1189
	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
L
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1190
	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1191
	__be32		seq;
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	struct kvec	iov;
	struct xdr_buf	verf_buf;
	struct xdr_netobj mic;
	u32		flav,len;
	u32		maj_stat;

1198
	dprintk("RPC: %5u gss_validate\n", task->tk_pid);
L
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1199 1200 1201

	flav = ntohl(*p++);
	if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
1202
		goto out_bad;
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1203 1204 1205 1206 1207 1208 1209 1210 1211
	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;

1212
	maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
L
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1213
	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1214
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1215
	if (maj_stat) {
1216
		dprintk("RPC: %5u gss_validate: gss_verify_mic returned "
1217
				"error 0x%08x\n", task->tk_pid, maj_stat);
L
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1218
		goto out_bad;
1219
	}
1220 1221
	/* We leave it to unwrap to calculate au_rslack. For now we just
	 * calculate the length of the verifier: */
1222
	cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
L
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1223
	gss_put_ctx(ctx);
1224
	dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n",
L
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1225 1226 1227 1228
			task->tk_pid);
	return p + XDR_QUADLEN(len);
out_bad:
	gss_put_ctx(ctx);
1229
	dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid);
L
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1230 1231 1232 1233 1234
	return NULL;
}

static inline int
gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1235
		kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj)
L
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1236 1237 1238
{
	struct xdr_buf	*snd_buf = &rqstp->rq_snd_buf;
	struct xdr_buf	integ_buf;
1239
	__be32          *integ_len = NULL;
L
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1240
	struct xdr_netobj mic;
1241 1242
	u32		offset;
	__be32		*q;
L
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1243 1244 1245 1246 1247 1248 1249 1250
	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);

1251
	status = encode(rqstp, p, obj);
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	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: */
1261
	if (snd_buf->page_len || snd_buf->tail[0].iov_len)
L
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		iov = snd_buf->tail;
	else
		iov = snd_buf->head;
	p = iov->iov_base + iov->iov_len;
	mic.data = (u8 *)(p + 1);

1268
	maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
L
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	status = -EIO; /* XXX? */
	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1271
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
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	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;
}

1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 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
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:
1319 1320
	rqstp->rq_enc_pages_num = i;
	priv_release_snd_buf(rqstp);
1321 1322 1323 1324 1325 1326
out:
	return -EAGAIN;
}

static inline int
gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1327
		kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj)
1328 1329 1330 1331 1332
{
	struct xdr_buf	*snd_buf = &rqstp->rq_snd_buf;
	u32		offset;
	u32             maj_stat;
	int		status;
1333
	__be32		*opaque_len;
1334 1335 1336 1337 1338 1339 1340 1341 1342 1343
	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);

1344
	status = encode(rqstp, p, obj);
1345 1346 1347 1348 1349 1350 1351 1352 1353 1354
	if (status)
		return status;

	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;
1355 1356 1357 1358 1359 1360 1361 1362
	/*
	 * 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.
	 */
1363 1364 1365 1366 1367
	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;
	}
1368
	maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
1369
	/* slack space should prevent this ever happening: */
1370
	BUG_ON(snd_buf->len > snd_buf->buflen);
1371
	status = -EIO;
1372 1373 1374
	/* 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)
1375
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393
	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
1394 1395
static int
gss_wrap_req(struct rpc_task *task,
1396
	     kxdrproc_t encode, void *rqstp, __be32 *p, void *obj)
L
Linus Torvalds 已提交
1397
{
1398
	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
L
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1399 1400 1401 1402 1403
	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;

1404
	dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid);
L
Linus Torvalds 已提交
1405 1406 1407 1408
	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.
		 */
1409
		status = encode(rqstp, p, obj);
L
Linus Torvalds 已提交
1410 1411 1412 1413
		goto out;
	}
	switch (gss_cred->gc_service) {
		case RPC_GSS_SVC_NONE:
1414
			status = encode(rqstp, p, obj);
L
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1415 1416 1417 1418 1419
			break;
		case RPC_GSS_SVC_INTEGRITY:
			status = gss_wrap_req_integ(cred, ctx, encode,
								rqstp, p, obj);
			break;
1420
		case RPC_GSS_SVC_PRIVACY:
1421 1422
			status = gss_wrap_req_priv(cred, ctx, encode,
					rqstp, p, obj);
L
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1423 1424 1425 1426
			break;
	}
out:
	gss_put_ctx(ctx);
1427
	dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status);
L
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1428 1429 1430 1431 1432
	return status;
}

static inline int
gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1433
		struct rpc_rqst *rqstp, __be32 **p)
L
Linus Torvalds 已提交
1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459
{
	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;

1460
	maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
L
Linus Torvalds 已提交
1461
	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1462
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
L
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1463 1464 1465 1466 1467
	if (maj_stat != GSS_S_COMPLETE)
		return status;
	return 0;
}

1468 1469
static inline int
gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1470
		struct rpc_rqst *rqstp, __be32 **p)
1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484
{
	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;

1485
	maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
1486
	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1487
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1488 1489 1490 1491 1492 1493 1494 1495 1496
	if (maj_stat != GSS_S_COMPLETE)
		return status;
	if (ntohl(*(*p)++) != rqstp->rq_seqno)
		return status;

	return 0;
}


L
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1497 1498
static int
gss_unwrap_resp(struct rpc_task *task,
1499
		kxdrproc_t decode, void *rqstp, __be32 *p, void *obj)
L
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1500
{
1501
	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
L
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1502 1503 1504
	struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
			gc_base);
	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1505
	__be32		*savedp = p;
1506 1507
	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;
1520
		case RPC_GSS_SVC_PRIVACY:
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			status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p);
			if (status)
				goto out;
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			break;
	}
1526
	/* take into account extra slack for integrity and privacy cases: */
1527
	cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp)
1528
						+ (savedlen - head->iov_len);
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out_decode:
1530
	status = decode(rqstp, p, obj);
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out:
	gss_put_ctx(ctx);
1533
	dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid,
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			status);
	return status;
}
1537

1538
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
};

1548
static const struct rpc_credops gss_credops = {
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	.cr_name	= "AUTH_GSS",
	.crdestroy	= gss_destroy_cred,
1551
	.cr_init	= gss_cred_init,
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	.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,
};

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static const struct rpc_credops gss_nullops = {
	.cr_name	= "AUTH_GSS",
1563
	.crdestroy	= gss_destroy_nullcred,
1564
	.crbind		= rpcauth_generic_bind_cred,
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	.crmatch	= gss_match,
	.crmarshal	= gss_marshal,
	.crrefresh	= gss_refresh_null,
	.crvalidate	= gss_validate,
	.crwrap_req	= gss_wrap_req,
	.crunwrap_resp	= gss_unwrap_resp,
};

1573
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,
};

1581
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,
\
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	.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;
1602
	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);
1614
	rcu_barrier(); /* Wait for completion of call_rcu()'s */
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}

MODULE_LICENSE("GPL");
1618 1619 1620 1621 1622 1623
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)