auth_gss.c 44.5 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.
	 */
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	struct rpc_pipe *pipe[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
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 * and a new one is protected by the pipe->lock.
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 */
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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;
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	unsigned long now = jiffies;
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	u32 window_size;
	int ret;

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	/* First unsigned int gives the remaining lifetime in seconds of the
	 * credential - e.g. the remaining TGT lifetime for Kerberos or
	 * the -t value passed to GSSD.
	 */
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	p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
	if (IS_ERR(p))
		goto err;
	if (timeout == 0)
		timeout = GSSD_MIN_TIMEOUT;
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	ctx->gc_expiry = now + ((unsigned long)timeout * HZ);
	/* Sequence number window. Determines the maximum number of
	 * simultaneous requests
	 */
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	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;
	}
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	dprintk("RPC:       %s Success. gc_expiry %lu now %lu timeout %u\n",
		__func__, ctx->gc_expiry, now, timeout);
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	return q;
err:
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	dprintk("RPC:       %s returns %ld gc_expiry %lu now %lu timeout %u\n",
		__func__, -PTR_ERR(p), ctx->gc_expiry, now, timeout);
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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;
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	kuid_t	uid;
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	struct rpc_pipe_msg msg;
	struct list_head list;
	struct gss_auth *auth;
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	struct rpc_pipe *pipe;
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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_pipe *pipe, kuid_t uid)
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{
	struct gss_upcall_msg *pos;
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	list_for_each_entry(pos, &pipe->in_downcall, list) {
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		if (!uid_eq(pos->uid, uid))
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			continue;
		atomic_inc(&pos->count);
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		dprintk("RPC:       %s found msg %p\n", __func__, pos);
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		return pos;
	}
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	dprintk("RPC:       %s found nothing\n", __func__);
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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_pipe *pipe = gss_msg->pipe;
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	struct gss_upcall_msg *old;

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	spin_lock(&pipe->lock);
	old = __gss_find_upcall(pipe, gss_msg->uid);
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	if (old == NULL) {
		atomic_inc(&gss_msg->count);
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		list_add(&gss_msg->list, &pipe->in_downcall);
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	} else
		gss_msg = old;
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	spin_unlock(&pipe->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 rpc_pipe *pipe = gss_msg->pipe;
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	if (list_empty(&gss_msg->list))
		return;
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	spin_lock(&pipe->lock);
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	if (!list_empty(&gss_msg->list))
		__gss_unhash_msg(gss_msg);
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	spin_unlock(&pipe->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 rpc_pipe *pipe = gss_msg->pipe;
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	spin_lock(&pipe->lock);
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	gss_handle_downcall_result(gss_cred, gss_msg);
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	spin_unlock(&pipe->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,
				const char *service_name)
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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 (service_name != NULL) {
		len = sprintf(p, "service=%s ", service_name);
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		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,
				const char *service_name)
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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, service_name);
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}

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static struct gss_upcall_msg *
gss_alloc_msg(struct gss_auth *gss_auth, struct rpc_clnt *clnt,
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		kuid_t uid, const char *service_name)
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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->pipe = gss_auth->pipe[vers];
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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, service_name);
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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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	kuid_t uid = cred->cr_uid;
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	gss_new = gss_alloc_msg(gss_auth, clnt, uid, gss_cred->gc_principal);
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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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		int res = rpc_queue_upcall(gss_new->pipe, &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 rpc_pipe *pipe;
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	int err = 0;

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	dprintk("RPC: %5u %s for uid %u\n",
520
		task->tk_pid, __func__, from_kuid(&init_user_ns, cred->cr_uid));
L
Linus Torvalds 已提交
521
	gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred);
R
Roel Kluin 已提交
522
	if (PTR_ERR(gss_msg) == -EAGAIN) {
523 524 525 526 527
		/* 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);
528
		return -EAGAIN;
529
	}
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Linus Torvalds 已提交
530 531 532 533
	if (IS_ERR(gss_msg)) {
		err = PTR_ERR(gss_msg);
		goto out;
	}
534 535
	pipe = gss_msg->pipe;
	spin_lock(&pipe->lock);
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Linus Torvalds 已提交
536
	if (gss_cred->gc_upcall != NULL)
537
		rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
538
	else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
L
Linus Torvalds 已提交
539 540 541 542
		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);
543
		rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback);
544 545
	} else {
		gss_handle_downcall_result(gss_cred, gss_msg);
L
Linus Torvalds 已提交
546
		err = gss_msg->msg.errno;
547
	}
548
	spin_unlock(&pipe->lock);
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Linus Torvalds 已提交
549 550
	gss_release_msg(gss_msg);
out:
551
	dprintk("RPC: %5u %s for uid %u result %d\n",
552 553
		task->tk_pid, __func__,
		from_kuid(&init_user_ns, cred->cr_uid),	err);
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554 555 556 557 558 559
	return err;
}

static inline int
gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
{
560
	struct rpc_pipe *pipe;
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561 562 563 564 565
	struct rpc_cred *cred = &gss_cred->gc_base;
	struct gss_upcall_msg *gss_msg;
	DEFINE_WAIT(wait);
	int err = 0;

566 567
	dprintk("RPC:       %s for uid %u\n",
		__func__, from_kuid(&init_user_ns, cred->cr_uid));
568
retry:
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Linus Torvalds 已提交
569
	gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred);
570 571 572
	if (PTR_ERR(gss_msg) == -EAGAIN) {
		err = wait_event_interruptible_timeout(pipe_version_waitqueue,
				pipe_version >= 0, 15*HZ);
573 574 575 576
		if (pipe_version < 0) {
			warn_gssd();
			err = -EACCES;
		}
577 578 579 580
		if (err)
			goto out;
		goto retry;
	}
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581 582 583 584
	if (IS_ERR(gss_msg)) {
		err = PTR_ERR(gss_msg);
		goto out;
	}
585
	pipe = gss_msg->pipe;
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Linus Torvalds 已提交
586
	for (;;) {
587
		prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE);
588
		spin_lock(&pipe->lock);
L
Linus Torvalds 已提交
589 590 591
		if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
			break;
		}
592
		spin_unlock(&pipe->lock);
593
		if (fatal_signal_pending(current)) {
L
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594 595 596 597 598 599
			err = -ERESTARTSYS;
			goto out_intr;
		}
		schedule();
	}
	if (gss_msg->ctx)
600
		gss_cred_set_ctx(cred, gss_msg->ctx);
L
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601 602
	else
		err = gss_msg->msg.errno;
603
	spin_unlock(&pipe->lock);
L
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604 605 606 607
out_intr:
	finish_wait(&gss_msg->waitqueue, &wait);
	gss_release_msg(gss_msg);
out:
608
	dprintk("RPC:       %s for uid %u result %d\n",
609
		__func__, from_kuid(&init_user_ns, cred->cr_uid), err);
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610 611 612 613 614 615 616 617 618 619 620
	return err;
}

#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;
621
	struct rpc_pipe *pipe = RPC_I(filp->f_dentry->d_inode)->pipe;
L
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622 623
	struct gss_cl_ctx *ctx;
	uid_t uid;
624
	ssize_t err = -EFBIG;
L
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625 626 627 628

	if (mlen > MSG_BUF_MAXSIZE)
		goto out;
	err = -ENOMEM;
629
	buf = kmalloc(mlen, GFP_NOFS);
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630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647
	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;
648 649 650

	err = -ENOENT;
	/* Find a matching upcall */
651 652
	spin_lock(&pipe->lock);
	gss_msg = __gss_find_upcall(pipe, uid);
653
	if (gss_msg == NULL) {
654
		spin_unlock(&pipe->lock);
655 656 657
		goto err_put_ctx;
	}
	list_del_init(&gss_msg->list);
658
	spin_unlock(&pipe->lock);
659

660
	p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
L
Linus Torvalds 已提交
661 662
	if (IS_ERR(p)) {
		err = PTR_ERR(p);
663 664
		switch (err) {
		case -EACCES:
665
		case -EKEYEXPIRED:
666 667 668 669 670 671 672 673 674 675 676
			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
677
				"gss_fill_context: %zd\n", __func__, err);
678 679
			BUG();
		}
680
		goto err_release_msg;
L
Linus Torvalds 已提交
681
	}
682 683 684 685
	gss_msg->ctx = gss_get_ctx(ctx);
	err = mlen;

err_release_msg:
686
	spin_lock(&pipe->lock);
687
	__gss_unhash_msg(gss_msg);
688
	spin_unlock(&pipe->lock);
689
	gss_release_msg(gss_msg);
L
Linus Torvalds 已提交
690 691 692 693 694
err_put_ctx:
	gss_put_ctx(ctx);
err:
	kfree(buf);
out:
695
	dprintk("RPC:       %s returning %Zd\n", __func__, err);
L
Linus Torvalds 已提交
696 697 698
	return err;
}

\
\"J. Bruce Fields\ 已提交
699
static int gss_pipe_open(struct inode *inode, int new_version)
700
{
\
\"J. Bruce Fields\ 已提交
701 702
	int ret = 0;

703 704
	spin_lock(&pipe_version_lock);
	if (pipe_version < 0) {
\
\"J. Bruce Fields\ 已提交
705 706
		/* First open of any gss pipe determines the version: */
		pipe_version = new_version;
707 708
		rpc_wake_up(&pipe_version_rpc_waitqueue);
		wake_up(&pipe_version_waitqueue);
\
\"J. Bruce Fields\ 已提交
709 710 711 712
	} else if (pipe_version != new_version) {
		/* Trying to open a pipe of a different version */
		ret = -EBUSY;
		goto out;
713
	}
714
	atomic_inc(&pipe_users);
\
\"J. Bruce Fields\ 已提交
715
out:
716
	spin_unlock(&pipe_version_lock);
\
\"J. Bruce Fields\ 已提交
717 718 719 720 721 722 723 724 725 726 727 728
	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);
729 730
}

L
Linus Torvalds 已提交
731 732 733
static void
gss_pipe_release(struct inode *inode)
{
734
	struct rpc_pipe *pipe = RPC_I(inode)->pipe;
735
	struct gss_upcall_msg *gss_msg;
L
Linus Torvalds 已提交
736

737
restart:
738 739
	spin_lock(&pipe->lock);
	list_for_each_entry(gss_msg, &pipe->in_downcall, list) {
L
Linus Torvalds 已提交
740

741 742
		if (!list_empty(&gss_msg->msg.list))
			continue;
L
Linus Torvalds 已提交
743 744 745
		gss_msg->msg.errno = -EPIPE;
		atomic_inc(&gss_msg->count);
		__gss_unhash_msg(gss_msg);
746
		spin_unlock(&pipe->lock);
L
Linus Torvalds 已提交
747
		gss_release_msg(gss_msg);
748
		goto restart;
L
Linus Torvalds 已提交
749
	}
750
	spin_unlock(&pipe->lock);
751

752
	put_pipe_version();
L
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753 754 755 756 757 758 759 760
}

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) {
761 762
		dprintk("RPC:       %s releasing msg %p\n",
			__func__, gss_msg);
L
Linus Torvalds 已提交
763 764
		atomic_inc(&gss_msg->count);
		gss_unhash_msg(gss_msg);
765 766
		if (msg->errno == -ETIMEDOUT)
			warn_gssd();
L
Linus Torvalds 已提交
767 768 769 770
		gss_release_msg(gss_msg);
	}
}

771 772 773 774 775
static void gss_pipes_dentries_destroy(struct rpc_auth *auth)
{
	struct gss_auth *gss_auth;

	gss_auth = container_of(auth, struct gss_auth, rpc_auth);
776 777 778 779
	if (gss_auth->pipe[0]->dentry)
		rpc_unlink(gss_auth->pipe[0]->dentry);
	if (gss_auth->pipe[1]->dentry)
		rpc_unlink(gss_auth->pipe[1]->dentry);
780 781 782 783 784 785 786 787 788 789 790
}

static int gss_pipes_dentries_create(struct rpc_auth *auth)
{
	int err;
	struct gss_auth *gss_auth;
	struct rpc_clnt *clnt;

	gss_auth = container_of(auth, struct gss_auth, rpc_auth);
	clnt = gss_auth->client;

791
	gss_auth->pipe[1]->dentry = rpc_mkpipe_dentry(clnt->cl_dentry,
792 793 794 795
						      "gssd",
						      clnt, gss_auth->pipe[1]);
	if (IS_ERR(gss_auth->pipe[1]->dentry))
		return PTR_ERR(gss_auth->pipe[1]->dentry);
796
	gss_auth->pipe[0]->dentry = rpc_mkpipe_dentry(clnt->cl_dentry,
797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812
						      gss_auth->mech->gm_name,
						      clnt, gss_auth->pipe[0]);
	if (IS_ERR(gss_auth->pipe[0]->dentry)) {
		err = PTR_ERR(gss_auth->pipe[0]->dentry);
		goto err_unlink_pipe_1;
	}
	return 0;

err_unlink_pipe_1:
	rpc_unlink(gss_auth->pipe[1]->dentry);
	return err;
}

static void gss_pipes_dentries_destroy_net(struct rpc_clnt *clnt,
					   struct rpc_auth *auth)
{
813
	struct net *net = rpc_net_ns(clnt);
814 815 816 817
	struct super_block *sb;

	sb = rpc_get_sb_net(net);
	if (sb) {
818
		if (clnt->cl_dentry)
819 820 821 822 823 824 825 826
			gss_pipes_dentries_destroy(auth);
		rpc_put_sb_net(net);
	}
}

static int gss_pipes_dentries_create_net(struct rpc_clnt *clnt,
					 struct rpc_auth *auth)
{
827
	struct net *net = rpc_net_ns(clnt);
828 829 830 831 832
	struct super_block *sb;
	int err = 0;

	sb = rpc_get_sb_net(net);
	if (sb) {
833
		if (clnt->cl_dentry)
834 835 836 837 838 839
			err = gss_pipes_dentries_create(auth);
		rpc_put_sb_net(net);
	}
	return err;
}

840 841
/*
 * NOTE: we have the opportunity to use different
L
Linus Torvalds 已提交
842 843 844 845 846 847 848
 * 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;
849
	int err = -ENOMEM; /* XXX? */
L
Linus Torvalds 已提交
850

851
	dprintk("RPC:       creating GSS authenticator for client %p\n", clnt);
L
Linus Torvalds 已提交
852 853

	if (!try_module_get(THIS_MODULE))
854
		return ERR_PTR(err);
L
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855 856 857
	if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
		goto out_dec;
	gss_auth->client = clnt;
858
	err = -EINVAL;
L
Linus Torvalds 已提交
859 860
	gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
	if (!gss_auth->mech) {
861
		printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n",
862
				__func__, flavor);
L
Linus Torvalds 已提交
863 864 865
		goto err_free;
	}
	gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
866 867
	if (gss_auth->service == 0)
		goto err_put_mech;
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868 869 870 871 872 873
	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);
874
	kref_init(&gss_auth->kref);
L
Linus Torvalds 已提交
875

\
\"J. Bruce Fields\ 已提交
876 877 878 879 880 881
	/*
	 * 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.
	 */
882 883 884 885
	gss_auth->pipe[1] = rpc_mkpipe_data(&gss_upcall_ops_v1,
					    RPC_PIPE_WAIT_FOR_OPEN);
	if (IS_ERR(gss_auth->pipe[1])) {
		err = PTR_ERR(gss_auth->pipe[1]);
L
Linus Torvalds 已提交
886
		goto err_put_mech;
887
	}
L
Linus Torvalds 已提交
888

889 890 891 892 893 894
	gss_auth->pipe[0] = rpc_mkpipe_data(&gss_upcall_ops_v0,
					    RPC_PIPE_WAIT_FOR_OPEN);
	if (IS_ERR(gss_auth->pipe[0])) {
		err = PTR_ERR(gss_auth->pipe[0]);
		goto err_destroy_pipe_1;
	}
895 896
	err = gss_pipes_dentries_create_net(clnt, auth);
	if (err)
897
		goto err_destroy_pipe_0;
898
	err = rpcauth_init_credcache(auth);
899
	if (err)
900
		goto err_unlink_pipes;
901

L
Linus Torvalds 已提交
902
	return auth;
903 904
err_unlink_pipes:
	gss_pipes_dentries_destroy_net(clnt, auth);
905 906 907 908
err_destroy_pipe_0:
	rpc_destroy_pipe_data(gss_auth->pipe[0]);
err_destroy_pipe_1:
	rpc_destroy_pipe_data(gss_auth->pipe[1]);
L
Linus Torvalds 已提交
909 910 911 912 913 914
err_put_mech:
	gss_mech_put(gss_auth->mech);
err_free:
	kfree(gss_auth);
out_dec:
	module_put(THIS_MODULE);
915
	return ERR_PTR(err);
L
Linus Torvalds 已提交
916 917
}

918 919 920
static void
gss_free(struct gss_auth *gss_auth)
{
921
	gss_pipes_dentries_destroy_net(gss_auth->client, &gss_auth->rpc_auth);
922 923
	rpc_destroy_pipe_data(gss_auth->pipe[0]);
	rpc_destroy_pipe_data(gss_auth->pipe[1]);
924 925 926 927 928 929 930 931 932 933 934 935 936 937
	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
938 939 940 941 942
static void
gss_destroy(struct rpc_auth *auth)
{
	struct gss_auth *gss_auth;

943 944
	dprintk("RPC:       destroying GSS authenticator %p flavor %d\n",
			auth, auth->au_flavor);
L
Linus Torvalds 已提交
945

946 947
	rpcauth_destroy_credcache(auth);

L
Linus Torvalds 已提交
948
	gss_auth = container_of(auth, struct gss_auth, rpc_auth);
949
	kref_put(&gss_auth->kref, gss_free_callback);
L
Linus Torvalds 已提交
950 951
}

952 953 954 955 956 957 958 959 960 961 962 963 964 965
/*
 * 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 ||
966
	    test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
967 968 969 970 971 972 973 974 975
		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);

976
	task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT);
977 978 979 980 981 982 983 984
	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
985 986 987
 * to create a new cred or context, so they check that things have been
 * allocated before freeing them. */
static void
988
gss_do_free_ctx(struct gss_cl_ctx *ctx)
L
Linus Torvalds 已提交
989
{
990
	dprintk("RPC:       %s\n", __func__);
L
Linus Torvalds 已提交
991

992
	gss_delete_sec_context(&ctx->gc_gss_ctx);
L
Linus Torvalds 已提交
993 994 995 996
	kfree(ctx->gc_wire_ctx.data);
	kfree(ctx);
}

997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009
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
1010
static void
1011
gss_free_cred(struct gss_cred *gss_cred)
L
Linus Torvalds 已提交
1012
{
1013
	dprintk("RPC:       %s cred=%p\n", __func__, gss_cred);
1014 1015
	kfree(gss_cred);
}
L
Linus Torvalds 已提交
1016

1017 1018 1019 1020 1021 1022
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
1023

1024
static void
1025
gss_destroy_nullcred(struct rpc_cred *cred)
1026
{
1027
	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1028
	struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
1029 1030
	struct gss_cl_ctx *ctx = gss_cred->gc_ctx;

1031
	RCU_INIT_POINTER(gss_cred->gc_ctx, NULL);
1032
	call_rcu(&cred->cr_rcu, gss_free_cred_callback);
1033 1034
	if (ctx)
		gss_put_ctx(ctx);
1035
	kref_put(&gss_auth->kref, gss_free_callback);
L
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1036 1037
}

1038 1039 1040 1041 1042 1043 1044 1045 1046
static void
gss_destroy_cred(struct rpc_cred *cred)
{

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

L
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1047 1048 1049 1050
/*
 * Lookup RPCSEC_GSS cred for the current process
 */
static struct rpc_cred *
1051
gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
L
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1052
{
1053
	return rpcauth_lookup_credcache(auth, acred, flags);
L
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1054 1055 1056
}

static struct rpc_cred *
1057
gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
L
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1058 1059 1060 1061 1062
{
	struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
	struct gss_cred	*cred = NULL;
	int err = -ENOMEM;

1063
	dprintk("RPC:       %s for uid %d, flavor %d\n",
1064 1065
		__func__, from_kuid(&init_user_ns, acred->uid),
		auth->au_flavor);
L
Linus Torvalds 已提交
1066

1067
	if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS)))
L
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1068 1069
		goto out_err;

1070
	rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops);
L
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1071 1072 1073 1074
	/*
	 * Note: in order to force a call to call_refresh(), we deliberately
	 * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
	 */
1075
	cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
L
Linus Torvalds 已提交
1076
	cred->gc_service = gss_auth->service;
1077 1078 1079
	cred->gc_principal = NULL;
	if (acred->machine_cred)
		cred->gc_principal = acred->principal;
1080
	kref_get(&gss_auth->kref);
L
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1081 1082 1083
	return &cred->gc_base;

out_err:
1084
	dprintk("RPC:       %s failed with error %d\n", __func__, err);
L
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1085 1086 1087
	return ERR_PTR(err);
}

1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100
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
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1101
static int
1102
gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
L
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1103 1104 1105
{
	struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);

1106
	if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
1107
		goto out;
L
Linus Torvalds 已提交
1108
	/* Don't match with creds that have expired. */
1109 1110 1111
	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
1112
		return 0;
1113
out:
1114 1115 1116 1117 1118 1119
	if (acred->principal != NULL) {
		if (gss_cred->gc_principal == NULL)
			return 0;
		return strcmp(acred->principal, gss_cred->gc_principal) == 0;
	}
	if (gss_cred->gc_principal != NULL)
1120
		return 0;
1121
	return uid_eq(rc->cr_uid, acred->uid);
L
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1122 1123 1124 1125 1126 1127
}

/*
* Marshal credentials.
* Maybe we should keep a cached credential for performance reasons.
*/
1128 1129
static __be32 *
gss_marshal(struct rpc_task *task, __be32 *p)
L
Linus Torvalds 已提交
1130
{
1131 1132
	struct rpc_rqst *req = task->tk_rqstp;
	struct rpc_cred *cred = req->rq_cred;
L
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1133 1134 1135
	struct gss_cred	*gss_cred = container_of(cred, struct gss_cred,
						 gc_base);
	struct gss_cl_ctx	*ctx = gss_cred_get_ctx(cred);
1136
	__be32		*cred_len;
L
Linus Torvalds 已提交
1137 1138 1139 1140 1141
	u32             maj_stat = 0;
	struct xdr_netobj mic;
	struct kvec	iov;
	struct xdr_buf	verf_buf;

1142
	dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
L
Linus Torvalds 已提交
1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159

	*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: */
1160 1161
	iov.iov_base = xprt_skip_transport_header(task->tk_xprt,
					req->rq_snd_buf.head[0].iov_base);
L
Linus Torvalds 已提交
1162 1163 1164 1165 1166 1167 1168
	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);
1169
	maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
L
Linus Torvalds 已提交
1170
	if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
1171
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
L
Linus Torvalds 已提交
1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183
	} 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;
}

1184 1185
static int gss_renew_cred(struct rpc_task *task)
{
1186
	struct rpc_cred *oldcred = task->tk_rqstp->rq_cred;
1187 1188 1189 1190 1191 1192
	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,
1193 1194
		.principal = gss_cred->gc_principal,
		.machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0),
1195 1196 1197 1198 1199 1200
	};
	struct rpc_cred *new;

	new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
	if (IS_ERR(new))
		return PTR_ERR(new);
1201
	task->tk_rqstp->rq_cred = new;
1202 1203 1204 1205
	put_rpccred(oldcred);
	return 0;
}

1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222
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
1223 1224 1225 1226 1227 1228
/*
* Refresh credentials. XXX - finish
*/
static int
gss_refresh(struct rpc_task *task)
{
1229
	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1230 1231
	int ret = 0;

1232 1233 1234
	if (gss_cred_is_negative_entry(cred))
		return -EKEYEXPIRED;

1235 1236 1237 1238 1239
	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;
1240
		cred = task->tk_rqstp->rq_cred;
1241
	}
L
Linus Torvalds 已提交
1242

1243 1244 1245 1246
	if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
		ret = gss_refresh_upcall(task);
out:
	return ret;
L
Linus Torvalds 已提交
1247 1248
}

1249 1250 1251 1252 1253 1254 1255
/* Dummy refresh routine: used only when destroying the context */
static int
gss_refresh_null(struct rpc_task *task)
{
	return -EACCES;
}

1256 1257
static __be32 *
gss_validate(struct rpc_task *task, __be32 *p)
L
Linus Torvalds 已提交
1258
{
1259
	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
L
Linus Torvalds 已提交
1260
	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1261
	__be32		seq;
L
Linus Torvalds 已提交
1262 1263 1264 1265 1266 1267
	struct kvec	iov;
	struct xdr_buf	verf_buf;
	struct xdr_netobj mic;
	u32		flav,len;
	u32		maj_stat;

1268
	dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
L
Linus Torvalds 已提交
1269 1270 1271

	flav = ntohl(*p++);
	if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
1272
		goto out_bad;
L
Linus Torvalds 已提交
1273 1274 1275 1276 1277 1278 1279 1280 1281
	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;

1282
	maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
L
Linus Torvalds 已提交
1283
	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1284
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1285
	if (maj_stat) {
1286 1287
		dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n",
			task->tk_pid, __func__, maj_stat);
L
Linus Torvalds 已提交
1288
		goto out_bad;
1289
	}
1290 1291
	/* We leave it to unwrap to calculate au_rslack. For now we just
	 * calculate the length of the verifier: */
1292
	cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
L
Linus Torvalds 已提交
1293
	gss_put_ctx(ctx);
1294 1295
	dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n",
			task->tk_pid, __func__);
L
Linus Torvalds 已提交
1296 1297 1298
	return p + XDR_QUADLEN(len);
out_bad:
	gss_put_ctx(ctx);
1299
	dprintk("RPC: %5u %s failed.\n", task->tk_pid, __func__);
L
Linus Torvalds 已提交
1300 1301 1302
	return NULL;
}

1303 1304 1305 1306 1307 1308 1309 1310 1311
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
1312 1313
static inline int
gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1314 1315
		   kxdreproc_t encode, struct rpc_rqst *rqstp,
		   __be32 *p, void *obj)
L
Linus Torvalds 已提交
1316 1317 1318
{
	struct xdr_buf	*snd_buf = &rqstp->rq_snd_buf;
	struct xdr_buf	integ_buf;
1319
	__be32          *integ_len = NULL;
L
Linus Torvalds 已提交
1320
	struct xdr_netobj mic;
1321 1322
	u32		offset;
	__be32		*q;
L
Linus Torvalds 已提交
1323 1324 1325 1326 1327 1328 1329 1330
	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);

1331
	gss_wrap_req_encode(encode, rqstp, p, obj);
L
Linus Torvalds 已提交
1332 1333 1334 1335 1336 1337 1338

	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: */
1339
	if (snd_buf->page_len || snd_buf->tail[0].iov_len)
L
Linus Torvalds 已提交
1340 1341 1342 1343 1344 1345
		iov = snd_buf->tail;
	else
		iov = snd_buf->head;
	p = iov->iov_base + iov->iov_len;
	mic.data = (u8 *)(p + 1);

1346
	maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
L
Linus Torvalds 已提交
1347 1348
	status = -EIO; /* XXX? */
	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1349
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
L
Linus Torvalds 已提交
1350 1351 1352 1353 1354 1355 1356 1357 1358 1359
	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;
}

1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396
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:
1397 1398
	rqstp->rq_enc_pages_num = i;
	priv_release_snd_buf(rqstp);
1399 1400 1401 1402 1403 1404
out:
	return -EAGAIN;
}

static inline int
gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1405 1406
		  kxdreproc_t encode, struct rpc_rqst *rqstp,
		  __be32 *p, void *obj)
1407 1408 1409 1410 1411
{
	struct xdr_buf	*snd_buf = &rqstp->rq_snd_buf;
	u32		offset;
	u32             maj_stat;
	int		status;
1412
	__be32		*opaque_len;
1413 1414 1415 1416 1417 1418 1419 1420 1421 1422
	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);

1423
	gss_wrap_req_encode(encode, rqstp, p, obj);
1424 1425 1426 1427 1428 1429 1430 1431

	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;
1432 1433 1434 1435 1436 1437 1438 1439
	/*
	 * 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.
	 */
1440 1441 1442 1443 1444
	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;
	}
1445
	maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
1446
	/* slack space should prevent this ever happening: */
1447
	BUG_ON(snd_buf->len > snd_buf->buflen);
1448
	status = -EIO;
1449 1450 1451
	/* 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)
1452
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470
	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
1471 1472
static int
gss_wrap_req(struct rpc_task *task,
1473
	     kxdreproc_t encode, void *rqstp, __be32 *p, void *obj)
L
Linus Torvalds 已提交
1474
{
1475
	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
L
Linus Torvalds 已提交
1476 1477 1478 1479 1480
	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;

1481
	dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
L
Linus Torvalds 已提交
1482 1483 1484 1485
	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.
		 */
1486 1487
		gss_wrap_req_encode(encode, rqstp, p, obj);
		status = 0;
L
Linus Torvalds 已提交
1488 1489 1490
		goto out;
	}
	switch (gss_cred->gc_service) {
J
Joe Perches 已提交
1491 1492 1493 1494 1495 1496 1497 1498 1499 1500
	case RPC_GSS_SVC_NONE:
		gss_wrap_req_encode(encode, rqstp, p, obj);
		status = 0;
		break;
	case RPC_GSS_SVC_INTEGRITY:
		status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj);
		break;
	case RPC_GSS_SVC_PRIVACY:
		status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj);
		break;
L
Linus Torvalds 已提交
1501 1502 1503
	}
out:
	gss_put_ctx(ctx);
1504
	dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status);
L
Linus Torvalds 已提交
1505 1506 1507 1508 1509
	return status;
}

static inline int
gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1510
		struct rpc_rqst *rqstp, __be32 **p)
L
Linus Torvalds 已提交
1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536
{
	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;

1537
	maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
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Linus Torvalds 已提交
1538
	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1539
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
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1540 1541 1542 1543 1544
	if (maj_stat != GSS_S_COMPLETE)
		return status;
	return 0;
}

1545 1546
static inline int
gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1547
		struct rpc_rqst *rqstp, __be32 **p)
1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561
{
	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;

1562
	maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
1563
	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1564
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1565 1566 1567 1568 1569 1570 1571 1572
	if (maj_stat != GSS_S_COMPLETE)
		return status;
	if (ntohl(*(*p)++) != rqstp->rq_seqno)
		return status;

	return 0;
}

1573 1574 1575 1576 1577 1578 1579 1580 1581
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);
}
1582

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1583 1584
static int
gss_unwrap_resp(struct rpc_task *task,
1585
		kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj)
L
Linus Torvalds 已提交
1586
{
1587
	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
L
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1588 1589 1590
	struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
			gc_base);
	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1591
	__be32		*savedp = p;
1592 1593
	struct kvec	*head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head;
	int		savedlen = head->iov_len;
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1594 1595 1596 1597 1598
	int             status = -EIO;

	if (ctx->gc_proc != RPC_GSS_PROC_DATA)
		goto out_decode;
	switch (gss_cred->gc_service) {
J
Joe Perches 已提交
1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610
	case RPC_GSS_SVC_NONE:
		break;
	case RPC_GSS_SVC_INTEGRITY:
		status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p);
		if (status)
			goto out;
		break;
	case RPC_GSS_SVC_PRIVACY:
		status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p);
		if (status)
			goto out;
		break;
L
Linus Torvalds 已提交
1611
	}
1612
	/* take into account extra slack for integrity and privacy cases: */
1613
	cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp)
1614
						+ (savedlen - head->iov_len);
L
Linus Torvalds 已提交
1615
out_decode:
1616
	status = gss_unwrap_req_decode(decode, rqstp, p, obj);
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1617 1618
out:
	gss_put_ctx(ctx);
1619 1620
	dprintk("RPC: %5u %s returning %d\n",
		task->tk_pid, __func__, status);
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Linus Torvalds 已提交
1621 1622
	return status;
}
1623

1624
static const struct rpc_authops authgss_ops = {
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1625 1626 1627 1628 1629 1630
	.owner		= THIS_MODULE,
	.au_flavor	= RPC_AUTH_GSS,
	.au_name	= "RPCSEC_GSS",
	.create		= gss_create,
	.destroy	= gss_destroy,
	.lookup_cred	= gss_lookup_cred,
1631 1632 1633
	.crcreate	= gss_create_cred,
	.pipes_create	= gss_pipes_dentries_create,
	.pipes_destroy	= gss_pipes_dentries_destroy,
C
Chuck Lever 已提交
1634
	.list_pseudoflavors = gss_mech_list_pseudoflavors,
L
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1635 1636
};

1637
static const struct rpc_credops gss_credops = {
L
Linus Torvalds 已提交
1638 1639
	.cr_name	= "AUTH_GSS",
	.crdestroy	= gss_destroy_cred,
1640
	.cr_init	= gss_cred_init,
1641
	.crbind		= rpcauth_generic_bind_cred,
L
Linus Torvalds 已提交
1642 1643 1644 1645 1646 1647 1648 1649
	.crmatch	= gss_match,
	.crmarshal	= gss_marshal,
	.crrefresh	= gss_refresh,
	.crvalidate	= gss_validate,
	.crwrap_req	= gss_wrap_req,
	.crunwrap_resp	= gss_unwrap_resp,
};

1650 1651
static const struct rpc_credops gss_nullops = {
	.cr_name	= "AUTH_GSS",
1652
	.crdestroy	= gss_destroy_nullcred,
1653
	.crbind		= rpcauth_generic_bind_cred,
1654 1655 1656 1657 1658 1659 1660 1661
	.crmatch	= gss_match,
	.crmarshal	= gss_marshal,
	.crrefresh	= gss_refresh_null,
	.crvalidate	= gss_validate,
	.crwrap_req	= gss_wrap_req,
	.crunwrap_resp	= gss_unwrap_resp,
};

1662
static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
1663
	.upcall		= rpc_pipe_generic_upcall,
\
\"J. Bruce Fields\ 已提交
1664 1665 1666 1667 1668 1669
	.downcall	= gss_pipe_downcall,
	.destroy_msg	= gss_pipe_destroy_msg,
	.open_pipe	= gss_pipe_open_v0,
	.release_pipe	= gss_pipe_release,
};

1670
static const struct rpc_pipe_ops gss_upcall_ops_v1 = {
1671
	.upcall		= rpc_pipe_generic_upcall,
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Linus Torvalds 已提交
1672 1673
	.downcall	= gss_pipe_downcall,
	.destroy_msg	= gss_pipe_destroy_msg,
\
\"J. Bruce Fields\ 已提交
1674
	.open_pipe	= gss_pipe_open_v1,
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Linus Torvalds 已提交
1675 1676 1677
	.release_pipe	= gss_pipe_release,
};

1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692
static __net_init int rpcsec_gss_init_net(struct net *net)
{
	return gss_svc_init_net(net);
}

static __net_exit void rpcsec_gss_exit_net(struct net *net)
{
	gss_svc_shutdown_net(net);
}

static struct pernet_operations rpcsec_gss_net_ops = {
	.init = rpcsec_gss_init_net,
	.exit = rpcsec_gss_exit_net,
};

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Linus Torvalds 已提交
1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705
/*
 * 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;
1706 1707 1708
	err = register_pernet_subsys(&rpcsec_gss_net_ops);
	if (err)
		goto out_svc_exit;
1709
	rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version");
L
Linus Torvalds 已提交
1710
	return 0;
1711 1712
out_svc_exit:
	gss_svc_shutdown();
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1713 1714 1715 1716 1717 1718 1719 1720
out_unregister:
	rpcauth_unregister(&authgss_ops);
out:
	return err;
}

static void __exit exit_rpcsec_gss(void)
{
1721
	unregister_pernet_subsys(&rpcsec_gss_net_ops);
L
Linus Torvalds 已提交
1722 1723
	gss_svc_shutdown();
	rpcauth_unregister(&authgss_ops);
1724
	rcu_barrier(); /* Wait for completion of call_rcu()'s */
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Linus Torvalds 已提交
1725 1726 1727
}

MODULE_LICENSE("GPL");
1728 1729 1730 1731 1732 1733
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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Linus Torvalds 已提交
1734 1735
module_init(init_rpcsec_gss)
module_exit(exit_rpcsec_gss)